Page 1
Down
East Microwave
Phone:
908-996-3584
Inc.
954 Route
(Voice
519 Frenchtown,
908-996-3702
(Fax
NJ
08825
NEW
Operational
The New DEM 432-28 is
operation. It will operate with
with any 28 MIIz.
watts and can be limited with
amplifier. The most noticeable inprovement
helical filters) a high
Osci.llator),
converter on the market today! The 432-28
separating the tansmit and receive
filtering
gain
requhements to obtain the
Dual oscillators axe
or a closure to
firnctions are available. A
purchased
jacks,
and the 70crn connectors are Type
enclosure with an external 8 lz" x 4" x3A"
***
High Dynamic
Overuiew
a 70cm to 28 MIIZ transverter
28
all
MHz. transceivers with transverter ports
transceiver with l0 Watts
an adjustable attenuator
biased GaAs-FET
provide
with a extemal or mast-mounted
separately. All IF connections
a sensitive,
provided
grormd,
PTT-L, have been
yet
best
for operation in
common
prcamplifier
over-load
ports
to add a high
perforrnance
IF
option that will operate at drive levels
are BNC comectors. The control,
preamplifier.
provided.
'N'
heat sink to
Range
DEM
Part Number
less
or
oulput
to
in the transverter is in
coupled with the edsting high
prooffront
has a built in tranffiit / receive relay
power
(sensitivity
the satellite
Auxiliary relay
(2
supplied). The 432-28 is housed ina8.7"
provide
70CM
Transverter
432-28
with a list of new features
and
power.
preset
end
Additional
portion
The 432-28
the output
the receive section. Additional
with superior out ofband rejection.
amplifier or to interface
options have been included
and IMD)
ofthe band. Keying
cool
power
possible.
contacts to control extemal
between
power,
operation under any conditio[
\
***
Kit
that allow it
with a simple option, it
has a maximum linear
ifyou
level mixer
provisions
but
the tansverters additional receive
options for
-20dBm
and auxiliary connections
to be more versatile in
will be compatible
ouq)ut
chose to use an
(+17
have
to custom tune
hansdt and receive
and 10 watts may
x5.7" x2.2" aluninum
additional
filtering,
dBm Local
This is the best receive
been made to allow
+l
to + 15VDC, PTT-H
NEW
power
(two
separate
youx
be
are RCA
die cast
of 30
power
receive
DEM 432-28
Operating Voltage 11.0
Current
Output
Output
Receive Noise Figure and
Drain
Power
Power
(Standard)
(Optional)
gain
-
6 amps maximum
Maximum
I mW
The
same output
of drive depending
1.0
dB
receive intermod
affect system
Assembly
input/output
Common
IF
External TR switching control
Separate
Transmit and Receive
option
ports
Operating
16.5
VDC. 13.8 nominal
30 W
(0dBm)
on
linear.
for l0
Spec
Transmit,
watts output
power
on the option used
maximum,
0.8 dB nominal, @ 17
performance.
noise figures,
Options
I - l0 Watt IF drive
-20
dBm IF drive
External
ifications
milliamps
600
Output has25
power.
can
be achieved, with
Other
and IMD
option
option
preamplifier
on Receive
dB of adjustable range.
-20
dBm
or up to 10
dB conversion
gain
options are available that will
gain
performance.
option
Minimum
watts
for
best
+1
to 15 V TTL or PTT
File 432-28_C.doc
ground
keying
*
Factory
I
DEv, 4J2-28
alignment available
Revision c t2ttstgSpage
on all
1
kits
Page 2
+
DEMI
Down
3.8 VDC
East
Microwave
Phone:
908-996-3584
XMIT
lnc.
(Volce)908-996-3702
RECEIVE
gs4
Route
(Fox)
PTT-
H L
s1g,
Frenchtown
http:/Aruww.downeostmtcrowwe,com
NJ
0ss25
oo
TF
AUX
RX
-6
DEMI
Connect
TlB,
follow those
your transceiver,
1. Open lid
2. Depending
transverter
enable
now
or contact
3.
Connect
quality
RXIF connectors
4.
Connect the Push
on
the transverter
transceiver.
5.
Connect the
the
"N"
Both transmit
are labeled
ports
will
6.
Connect the DC
the transverter
7.
Preset the TXIF
and the RXIF fully clockwise(
8. Power
9. Apply
transmit
10. Adjust the RXIF
or
change.
range of
power
just
a slight movement
transceiver
Wur
Interfacing
instructjons
follow
of transverter
on the
ports.
transverter
all lF cables.
coax
connectors
"Transmit"
provide
your
transceiver
LED should
The RXIF gain
your
Follow
operation.
Down East
cable to connect
on
to Talk line
and uses
70cm antenna
and receive functions
the labeled
power
will operate
and RXIF gain controls.
to the transverter
gain
transceiver.
the steps
make
the transverter.
is labeled
nol Set the local
control counter-clockwise
to the
the transverter
by removing
Both
and
to the transverter.
on and leave it
may be increased
transverter:
for
interfacing.
listed
below.
6
and model
whatever
lf it requires
Microwave
receive
the
out of
a RCA
system
'Antenna"
"Receive",
functions.
normally from
minimum
and turn
in the
Find
of
instructions
and transmit
28 MHz.
your transceiver
connector.
or a dummy
will
meter is detected.
"S"
a signal
to
the transceiver
screws.
your
for assistance.
then
be
the
Turn
attenuation).
in the Receive
on the
oscillator
on the band
is easy.
If the transverter
transceiver,
you have,in
a special
are
transverter
The correct
load with
the internal
provided
internal transfer
lt uses
12 to 15
beyond
a RCA type
the TXIF
power
switch to 432MHz.
until a
this poinq
it may
connector
BNC
ports
to
the transverter.
through
volre.
fully counter-clockwise
mode on
switch.
slight noise
Power
or use a signal
lf
your transceiver
was
configured
or may
your transceiver's
or
connections
from
keying
power
a
transfer
this
connector.
relay has
connector.
28.100 MHz.
The power
the
but it will
not be
cable
your
increase is
assembiy,
on
the transverter.
transceiver
lt is labeled
type is
relay
transverter
generator
already
meter
to
in the transverter
been
bypassed
13.8
LED should
start to
requires
for
direct
necessary
operation
the
lf the
volts is
(maximum
heard in the
on and off
degrade the
to
connection
it should
to the
pTT-
configured
transverter.
,,N,,
and the
optimum
light and
determine
a
DEM
to
to
enable
manual
be
Use
TXIF a;d
H or
for
is installed.
connectors
separate
attenuation)
transceiver
to verify
dynamic
correct
the
to
made
qood
pTT-
your
lf one of
but
the
the
L
lBuil|a32-2B.doc
Rev.
A
11lOBlA1
Page 3
Down East Microwave
Phone:
908-996-3584
fnc. 954 Route 519
(Voice,
908-996-3702
Frenchtown,
(Fax
NJ 0882'5
Printed Circuit
Your kit is
reference designators
(PCB)
begin by aligning the PCB
sides
You will also
provided
is also shown to eliminate mirror image assembly erlors. The top and bottom side assembly operation should aluays
ofthe PCB board as a
Assembly Notes:
with easy to
that correspond to the
outline
key.
notice
the assembly diagram that there are circles, double circles, and
on
read component
placement
provided
with
the
line of the component
out
You may also use the
diagrans that show the component
component list
printed
lettering
placement
(Bag
1 - Bag 4). Each side
placement
on the top side ofthe PCB board for a indicator.
diagams. Use the
')("
ofthe
notches
shown . These are shown
and the
printed
on the
ctcuit
longer
provide locating help when installing components. Components are mounted in the single holes. Double Circles are
Mounting Holes
and Holes with
3'X"
are for Wire installation only!
Assenbly Tips:
Soldering
o
The DOTS on the
correctly
formation, either longer or angle cut. The GaAsFET
to the
the assembly diagram
against the
(See
Figure 2).
o
Align
o
While
of all
o
If the alignment
swface for the entire lead length. Additional
surface mounted active components
-
MMICs
prior
to soldering. The GaAsFET
assembly diagram
mounting surface, ifthey are not, a tool such as a small bladed screw driver can
the
component
holding
component in
the
leads.
is acceptable, solder the rernaining leads.
(ICl
IC4, IC6 - IC8) determine their orientation and must be observed and
(Q6)
and Bipolar
(See
Figure 1B). The
(See
Figure lA). Leads on all active surface
place
in
based on the diagram.
place,
solder one lead to hold the component
long
amounts results
(transistors
(Q5)
orientation
(Q6)
angle cut
lead on the Bipolar
You
need
a
in
lead
mounted
enough
smaller
etc.):
is
determined by their lead
is
or dot
(Q5)
the Gate
the
is
components should be somewhat
place
in
to cover the lead and mormting
solder
solder roll!
side vrhich corresponds
collector
and conesponds to
be used
observe
and
(See
Figure 2 shaded areas)
the
to
positioned
flatten them.
alignment
board
to
flat
Figure 1A
Q5
L€ads
Sonr
Typical
trace,4plm
Itat to
backis U(
'l*
I
v
side view
offour
Long Lcad
Collector
surface mounted
leaded
Q6
Figure
Figure
18
Solder shown in
Solder full length
device, lead bending
2
sbaded arcas
of lead,4
FCtsTrace
close
places
to
body
File
432-28
C.doc
I
*
DEv^
4t2-28
Revision
c tzttstggp,.ge
2
Page 4
Down
East Microwuve
Phone:
908-996-3584
Inc. 954
(Voicd
Route 519
908-996-3702
Frenclttown,
(Fax
^{J
08825
Soldering
.
.
.
.
.
Soldering
Depending on
PCB. It
allow the components to be
to
assembly.
push
opposite
if the component
Rework
The
easiest
purpose. It
heat to
apply
removed.
to be
surface
Determine
Without the component in
Place the
previously
Holding
solder and allow
Now
component
the component
heat
leaded components
is
suggested
As an altemate method,
down to the
direction to
of soldered components if needed:
method to
purchased
can be
it.
Without excessive
mounted
component mounting
the
in
the correct
melted solder.
in
it
flow into
to
flow
and
your
the solder to the other
available tools,
for
horne
the
circuit
board,
hold
the compon€nt
must
rework
removed
be
soldered components
at any
pressure
passive
place,
heat
place
witl tweezers
the solder, once solidified, remove holding
(resistors,
you
assembler to use a method
'dropped
you
can
while holding
when the
electronics store. Place the de-soldering braid on the lead tlat
components
position
posilion
based on
one side of the mounting area
per
the assembly
other
or
side of the component and
capacitors, diodes,
can solder
in'
in
the solder will
your
transverter's components
from
the top side
insert
one component
the component,
place.
Although this is the most reliable method.
PCB is installed in
is
to employ a de-soldering braid that
melt
(chip
the assembly diagram.
soldering aid, heat the
resistors / capacitors):
flow
and
diagram, it should now have
your
a small amount
end with the
tool.
done
!
etc.):
from either
is comfortable.
that
and soldered on this side withont flipping
at a time
flip
over the circuit
the enclosure.
flow into
and
the braid
A simple
in
the correct
board
moundng
and
is
specifically designed for this
leaving
of solder on
one end over the
previously
the top or bottom of the
holding
the
vise can
location
bend the
there are some
you
are
lead
or component
melted
be utilized
over the
and
leads
over in
draw backs
removing
it.
gently
and
ready
The DEM 432-2E is
is
confortable,
Surface
Refening to the
transistors)
options depending
The assembly
determined
configuration
Surface
l On
2. On the bottom
3.
General
Install C46 - C51.
pCB.
the
of
Ll,I-6,
l/8"wodden
enamel
evolution
beyond
wire, extend
the
however
Mount Component Suggested
PCB assembly diagrams
on the back side and
operation should begin
by observing
as explained in the
Mount
the TOP side, depending
-
IC4, IC6.
ICl
Reche.k orientation
Assembly
Follow the surface
Ll2,Ll3,Ll7,L18,L19,L20,
mandrel.
one turn.
as
mandrel.
fair$
easy and fun to assemble even
DEM
on whether
the notches on the
Inc. suggests the
(3)
three
your
application
by
Assembly Tips
following
you
will see that there are six
on the top.
requires
orienting
long sides of thePCB,
section.
Component Suggested
your
requirements,
place,
in
passive
and
not an
so
then install and solder
R25
R24,
component
L22 must be
exact science and
turns
they are
direction
side, Solder
ofall
C54 - C56,
Winding coils
about %"
W}ren the total
Form
the
on
Q5
active devices
C59 - C6l.
mounted
is
perpendicular
in a
number of
leads
two
for the first time kit
assembly
prbcedure
Assembly:
(6)
surface
the
All
PCB
three ofthese
them or
with the
top
not.
page
See
top side assembly diagram. Orientation can be
Observed
Assembly;
install
installed with component
R26. These are
&,
assembly
formed
is
completed
pointing
prior
you
offof the
in the directions
solder
and
the
surface
presented earlier in this document.
tips
installation. The coils
to
should
mandrel and wind the
(BAG
3
builder and
minimize errors
to
active components may be
side
I I for
poldrily
Q4,
balance
placement
mounted components
not
be
component
shown
can be
mounted
IC7
of the bottom side
intimidated
active components
of these options.
details
either
using
IC8.
and
diagram.
should be wound around the
by it. Using the supplied
wire around
list) cut
in
the
the
forming side view details.
completed
and
the
wire
in
any order that
possible
DOTS
active components
located on the top side
frustration.
(MMIC,
installed
lead
or
it, counting each
an additional %"
as
#24
File 432-28
C.doc
-&
I
DEMI
432-28 Revision
DEM
c
06/12/ooPage
3
Page 5
Down East
Phone:
Microwave
908-996-3584
fnc.
Route
954
(Voice)
519 Frenchtown,
908-996-3702
(F*v.
-U8"
ii
NJ
08825
Solder Coat
places
2
Ll7,L18, L19,
Dress the tums together ifthey are out of shape from winding, remove the
complete! To enswe a
soldering.
you
This can be accomplished by applying
will see the insulation bubble indicating that it has melted
positive
solder connection, the 1/8" leads should have the enamel insulation removed prior
&L20
solder
to a hot
(The
LI,L6,LI2,LI3,
coil
soldering iron tip and
timed lead should
insulation has been removed and the solder has tinned the base metal, ifnot repeat the
enamel can be removed by scraping the
exposed base
Install and solder all
Now assemble and
metal, do not allow the outside diameter to increase so that the coil will not fit in the mounting hole.
prepped
inductors
solder the components in the following sugg€sted order as shown on the component
l/8" leads
as shown on tlre component
with a
razor
blade rmtil the base metal is exposed. Solder coat the
placement
diagram. Swface mount and through hole.
diagratrL
at the
in the
one
spot
and NOTES
CRI
L2
C13. The leads
all
DroDer
exit
Pin I hole on
polaritv
Ql - Q4, Q7,
Y2 crystal
point
of
on each side
-
CRl0
-L5,L7 -Lll,Ll{ -Ll6,L2l,L23
leaded resistors including
This ena soldered to
leaded capacitors.
all tantalum capacitors
on
VRI
if
ordered
the leads of
the PCB. Solder
Cross Sectional
Ensure
Note:
may have
Formins Detail
-
VR4
an option. Second
as
mixer M1,
proper polaritv
solder on them and my
excess
R35 and R38. Surface
pwb
surfece
of
Note: Ensure
notice that one
leads, then on the
the
of Ml
view
in PWB
-L28
molded Chokes
as shown
proper polarity
Xtal.
on the assembly document
may be installed at a
is colored blue
top side apply
STEP
I Form, install and solder
2 Form,
3
4 Form,
5
6
7
8
OPERATION
install and solder
Install and solder C2 &
install and solder all
Form, install and solder
Ensure
Note:
Install and solder
Yl . Install
Install
Looking
installed
surface,
&L22
from
the drill bit. The coil forming is
placing
be a silver color
process).
mount
the lead in the molten
indicating
As an altemative, the
not fit into PCB holes.
one
(see
below),
solder
lead
F.27.
of
later date.
this is
from the case
to
solder,
that the
placement
pin
I and should be
to
PCB
the
9
10
Install
not
Do
either
432-28
File
@ffiffiffi
1
Pin
Blue
Bottom
Kl,
Relays
Install
F1
Filters
Install
wires
solder
and
cause
C.doc
directly
undesired
lay wires
will
Ml
View
K2
-
F4. Do
in the shown
on
not bend
board or
the
oscillations
Solder each
over
areas on
the
rurderneath
route
and spurious
to PWB
side
the case
tabs.
component
responses
Mixer flush to
all
Solder
placement diagram
Even though
PCB.
the
I
-a-
DEM432-28
DEMI
PWB
leads on the
(holes
this
Revision
boffom
with
makes
l2ll5l98
C
side
an'X")
for a
Page 4
per
neater assembly,
the table
below.
doing
Page 6
Down
East Microwave
Phone:
908-996-3584
fnc. 954
Route
orce 908-996-3702
519
Frenchtown,
(Fax
NJ 08825
Strip i %" from
connected
each end and solder tin
later in
the assemblv
orocess.
WIRE
#26
Teflon TXON
#26 Teflon
#26 Teflon
#26
Teflon
#26 Teflon
#26 Teflon
#26 Teflon
#26 Teflon
#26 Teflon
#22 Teflon RXIF
#22 Teflon
#26 Teflon
#26 Teflon TR
+13.8
+13.8
+13.8
+13.8
+13.8
T)(LED
LOI
LO2
TXIF
RXON near R32
Select the type of keying
your
transceiver. Consult
near R3l
SW
bus
near R4l
SW bus near R4l
near
SW
SW bus
SW bus
near
function
your
near
near R41
Q7
for
transceiver's manual for
\aDC) transmit keying or a PTT - Low
in
the desired connection and
transmit
open) and
a voltage
key line, the extra
(normally
NC
(+13.8SW)
if required. Use the supplied #26 Teflon
NC may be connected to the AUX
leave it
set of contacts
closed) and are referenced to Receive. You may
jack
the end
FROM
CR7
R4l
prior
to installing
the wires.
TXON
Flying
Flying
+13.8
+13.8
+13.8
Flying
Flying lead
Flying
Flying
Flying
RXON
NOTE: Flying leads
rear
C44
(for
Lead
(for
Lead
near
SW
SW
K2
near Kl
SW near R16
lead
lead
Lead
Lead
near
VR4
TR near K2
the transverter. This input is required for
you
details
(Push
To Talk
gound)
to
as a flying lead. Ifyou
in relay Kl rnay
if
are not sure. Either a PTT-
are
the choices.
plan
to use a external amplifier
be utilized. The
keying
Install
contacts are
connect the C to either
Then
wire.
on
the back wall of the transvQrter affer rhe PCB is installed.
depending on
are wires
tbat will
TO
6"
Power
LO
Switch)
switch)
2"
4"
a((
J
3Yz"
al /))
J72
2"
2"
a))
J
IYo"
It/q"
at /),
J72
a))
J
the trarsverter and will
(+1
High
and solder a 4" #26 Teflon
preamp
or
marked
your
C
requirements,
that requires
(Common)
ground,
(any
either the NO
NO
be
SIZE
depend on
+15
to
wire
a
(normally
via hole)
or
or
Post soldering
All leads
eliminate
incorrectly installed
Now refer
shown and solder
the board
flush
PCB
The heat sink and enclosure
PCB have corresponding
attached
including
possible
wires extending through to the bottom side of the PCB
shorting to the enclosure when
components,
to the bottom side
and it is
gound plane
to the
it
to the
important
component
ground plane.
not have
to
possible.
as
assembly into the enclosure.
are machined at the factory for
holes
which are directional and
with a common screw
/ nut combination.
followed.
not
If
already
have
may
that
Atigning the enclosure's and
in a machined hole
screw
Allen Key wrcnch,
in a diagonal
screw
an tighten
nuts. Do not install cap screws
Now install all of the
the center
to Figure
pins
38. for tlis at a
Now install the
remove
done,
been trapped
the cover
during
heat sink's
from
the
4-40 nut on tlle screw threads
start a
location
1/8" in length. The coaxial cable will be
to
from
connectors
later
time.
in
remaining rear wall mounted connectors,
installed. Look
and missing components.
placement
It is
any
printed
The
diagram and review the
suggested to
gaps
between the brass angle ard the
re-flow
circuit is now
your
must be aligned correctly. The heat sink and tlle enclosure are
Installation in
from the enclosure and wipe the
machining.
heat
place
sink.
machined holes,
"fin"
side of the
inside ofthe enclosure and
last screw and
the
in the thr€aded
the enclosure.
hand
tighten
holes
Using Figure
installed on the connector after
per
should be trirnmed as short as
your
over
work for solder bridging
positioning
the solder under the
ready
for testing.
of the brass angle.
F2 filter. This may
ground plane
but also have the brass as
to adjac€nt traces,
possible
Position
be a bigh spot on
convenience. Notice that the heat sink, enclosure and the
is
the enclosure
inside clean to remove any
heat
the
sink on the enclosure.
While holding the screw
only. Install the balance ofthe screw
heatsink!
of the
3A
38,, install
and
the location in Figure
easy
hand
the
4:
ifthe
suggested assembly steps are
renaining metal
Then insert one
in
heat sink with the
the
tighten
only. Install one
/ nut combinations
*N'
type
connectors as shown. Cut
it is
attached to the
# 4-40
provided
PCB. Refer
to
it as
particles
cap
more
432-28_C.doc
File
DEN4 432-28 Revision
#
C 08/16/00 Page 5
Page 7
Down
East Microwove
Phone:
908-996-3584
fnc.
954 Route 519
(Voice)
Frenchtown, NJ
908-996-3702
08825
(Fax.
Solder coax
center
connector
to
Prepare
Top View of Solder
Bend
conductor
the
at Dotted Line
pin
connector
Solder
solder lug as shown
Log,
Side View of
Figure 3A
-
\\
lug
PCB
MOUNTNG AREA
\\
prior
to installing
NUT
formed
solder coax shield to formed lug
\
"...K
RG/188
coax
Solder Lug
from PWB
"ANT"
Figure 38
3.8
-
BNC connectors at
2
the inside of the enclosure.
on
adapter
-
RCA connectors
3
installed under the solder
wall.
File 432-28_C.doc
lnside View of Enclosure,
VDC
or
(l
V
|ANTENNAI
)OIIT
the
cable
connector
for
t,
V
ANTENNA
RECETVE
Figure
RXIF
AIIX, PTT-H-L and 13.8VDC
4 Jack
positions
TXIF
and
install
Do not
hold
and
lug on the inside of the enclosure.
while tightening
this
Solder Lug
-
PTT-H
Mounting
the
using
lugs. If
solder
using
l
DEM 432-28 Revision c tztt4tgSpage 6
*
Installation
on the'N' or UHF Connector
oo
L
AUX
Positions
supplied 3/8"
you
to keep it
the supplied hardware. The flat washer should
After
Outside
have.difficulty tightening the connector, connect
from spinning.
tightening,
RX
View
nuts. If washers
the lug
TX
are supplied, install them
be bent
should
be
away
from
an
the
Page 8
Down
East Microwove
Phone:
908-996-3584
fnc.
954 Route
(Voice
519 Frenchtown,
908-996-3702
(Fax,
Nf 08825
PCB assembly into the
Place the finished circuit board over
nuts on opposite corners on the screws
4-40 screws and the PCB
Replace the PCB and use it as a
only.
-Mount
1
-Mount
2
At
Refer to Figures 4 and 5 for correct connectors.
Connect
"102")
Connect and solder the #26 Teflon wire from LO2 on the PCB to the lower terminal on the LO
be closest
Connect and solder the longest
Connect
LO switch.
Connect
mounted POWER switch and solder.
Connect and solder the last
POWER
the POWER switch using the
the LO2-432
point,
this
some
the #26 Teflon
to the center
printed
to the
and solder the #26 Teflon wire from LO1 on the PCB to the temfnal
and solder the #26 Teflon wire from the
switch that is
rnounting
switch using the supplied hardware. Mounting ofthe
flying wires
ofthe
(PTT-L
pin
and solder lug and solder.
circuit
closest
enclosure, continued.
the t*€lve
extending
holes, simply note the
guide
will need to be connected
or PTT-I{) wire to
board.
#26
Teflon wire Aom the
#26 Teflon wire from the
to the opening in the enclosure.
4-40
through
for alignment.
supplied
hardware.
+13.8V
screw / nut combination
the \ rall mormted RCA
(See
+l3.8SW
gently push
and
the PCB and tighten evenly. Ifany miss-alignment
position
Then tighten the lose
Figure 4 for
+13.8SW
on the PCB
ofthe screw relative to the PCB
screw
Mowrting of the switch should be
should
switch
in
the enclosure to allow
jack,
then connect a l000pF capacitor
jack
location).
bus near R41 to the middle terrninal on the LO
to the opening on the
closest
(near
C53) to the middle terminal on the wall
(neax
bus
R41)
the terminal
to
flat against the nuts. Place
proceed.
and
be so it is toggled
prelininary
on the
loosen
and
it is toggled per
so
electrical testing..
switch.
This
wall mounted
occrus
with
that screw
Figure 5.
per
Figure 5.
(labeled
terninal will
switch.
wall mounted
two
the
Comect
powerjack
placed
capacitor
terminal,
a 3"
on the swface and
to the DC
piece
of #18
(13.8VDC)
powerjack,
Teflon
wire(Blue)
then route the other end the wire to the
soldered. There
observed
432
and
strip 3/8" on
no holes to insert the wire in on this
are
polarity,
positive
lead to the center
o
LO2
Figure 5 Switch
I
/ LED
each eqd.
pad
labeled
Solder to
+13.8V,
Switch Toggle
the center
near C53.This end ofthe wire will be
pad.
Then Connect and solder the 100pF
pin
ofthejack,
Direction
ooo
XMIT ON
Mounting Positions
POWER
the wall mouted DC
of
negative to the
ground
I
Electrical
Apply
power
continue
placement
File 432-28_C.doc
Test Verification
13.8 volt, current limited supply
switch.
The
transverter
by checking the oscillator section. Voltages
diagram
for test
of PCB.
(.5
will now be in the
point
location.
Receive
to the RCA DC
amps)
receive mode. Check the voltages in the order shown, on the test table then
are referenced to
only:
pin
Porerjack.
ground
I
*
DEv. 432-28 Revision c
center
The
is the encloswe. Use the component
which
l2tl4tggpage 7
positive.
is
Tum on the
Page 9
Down Esst Microwove fnc. 954
Phone: 908-996-3584
(Voice
Route 519 Frenchtown,
908-996-3702
(Fax
NJ 08825
TEST Test Point Location
RX1
+13.8SW
RX2 Junction of C63 &P.27
RX3 Junction of R27 &
Q6
RX4 Junction of R28 &Lzl
RX5 Leg
RX6 Jrurction of Rl7 & C31
RX7 Leg
of C62,,L21 side
of C29,
R17
side
RX8 Junction of R16 and C29
RX9 Leg of C28. Rl6 side
RXlO Junction of Rl5 and
RXl1 Leg of
RX12 Verifu LOI
RXl3 Junction
RXI4 Junction of C77 and
.:.Due
to variances in the GaAs FET devices
C23,
of
Rl5 side
and
R32
C24 2.0
LO2 corespond to
IC8
and
IC8
you
between 50-65 mA as measured across R2? as I in
either removing
RX Test
Failed
TEST
RX1
RX2
RX3
RX4 Check
RX5
RX6
RX7
RX8
RX9
RXlO
RXl1
either
Trouble
+13.8SW
Missing
If
voltage
If
RX4 test
Missing
If
RX6
Rl6 wrong
If
RX8 test
Rl5 wrong
IfRXl0testfailed,replacelCl.
RXl2 Switch
RXl3
RXl4
R32 wrong
RX13 test
If
R25 or
shooting
shorted to
+13.8SW
higher than 5.0V,
value of R28.
failed,
+13.8SW
test failed,
value or shorted
failed,
value or shorted.
wired wrong.
value
failed,
(to
R26
jumper,
replace IC6. If RX4 test
wire. Rl7
replace IC3.
replace IC2. If
or
lower
Ground,
L21
If low
shorted.
replace IC8.
Power
Output on VR4
Q6
open
wrong
ICZ
.
IC1
voltage, wire, capacitor
IC8 shorted to
current) or
supply
is damaged.
or shorted to
value or
If RX6
shorted
RX8
shorted
If RXl0testOK, C23isshortedortheinputoflCl
If RX13 test OK, C77
VOLTAGE
Power
supply Voltage
9.0 + 0.5vDC
-
r.s
4.5 vDC *
5.0 t
1.ovDC
1.8
t
.5VDC
5.0 r lVDC
+
1.5
.5VDC
+lvDC
5.0
1.5
I.5VDC
-
7.5 VDC
1.5 + 1.0vDC
Power
(if
installed)
(if
installed)
Switch
+
5.0
r.5VDC
1.8
lVDC
supply voltage'
may need to adjust the Drain curent. Optimal
=E
mA
(voltage
drop across
adding an extra 24 ohm resistor
in
shorted to
Check
ground.
OK, C62
shorted.
OK,
test
ground,
to
OK,
test
ground,
to
ground,
Probable
ctrrent
C29 is
C28 is
causes
limit" Missing wire.
ground.
R25,26. If voltage too low, increase
or
shorted
or the
or installed
or the
or installed
to
the
to
IC6 shorted
is
shorted
IC3
shorted
defective,
shorted
defective, or installed
regulator shorted to
or
defective,
is shorted or
R27) + R27. The
(to
increase curent).
ground
,defective,
input
ground,
input of
incorrectly.
input of
incorrectly.
ground
incorrectly.
input of IC8
the
IC6 is
of
defective,
IC3 is
IC2 is
performance
curent
Q6
installed incorrectly.
or
shorted
or
shorted
shorted
isshortedtoground,
LO
on the
is shorted to
occurs
may
be adjusted
source
ground.
to
installed incorrectly.
ground.
to
ground.
to
input
on
ground.
by
resistance
PCB.
lf any of
the above tests
Local Oscillator'l
Veriry that there
oscillator
with the
position
readjust C24 for
position,
and
TPl and adjust
probe
present. You may skip
is
proceed to tlle TX testing.
obtained
File 432-28_C.doc
position.
positive lead ofa
preferred
is
process
repeat
replace it. The
jrmction
the
pl€ase
continue the
fail, repair or
(4321
is a 101.000 MHz.
test will not work if an crystal
This
consult Down East
Testing :
crystal in the
Voltrneter. Adjust C2 for maximurn
(see
C2 or C13 diagram
maximum voltage,
the capacitor should be
but this time compress
final voltage at
C2 for 101.00000MH2.
and R17
of C31
TPl
to
should
Ifyow
veriry
the rest ofthis test and
Ifthe frequency can
LO testing on the next
Microwave before
position.
Y1
is not
Ifthere
installed. Switch the LO
voltage, note where
Ifthe capacitor
).
is at tlte maximum
near midrange,
coil Ll and
if necessary,
be approximately
frequency counter is capable ofmeasuring
that four
(4)
times
start the LO2 test
not
obtained, skip to step
be
page
I
*
is
only one
crystal installed,
the capacitor
position,
ifnot repeat. Ifthe caPacitor
you
may need
1.0 - 2.0 volts.
the fimdamental
If a frequency counter is
frequency of the crystal.(404.00000
ifyou have installed a crystal
#8 . Ifthe specified voltage
DEv_4t2-28 Revision
cuztlitggpage
proceeding
with the
it shoutd
switch to the 432
positioned.
is
spread coil
to wind a new coil
to
up
500Mhz
in the Y2
8
oscillator testing
be in the LOl
position.
Ll, 1 to 2 tums and
is
at TPI cannot be
Probe TPI
A midrange
minimum
at
with an extra tum
available
you
probe
can also
MHz.)
position.
Ifnot
Page 10
Down East
Phone:
Microwave
908-996-3584
ENB
Inc.
Minimum
Route
954
(Voice)
519 Frenchtown, NJ
908-996-3702
(Fax,
08825
Co2roroCl3
Local
It is
5* overtone design. If
operate on a different overtone. Crystal failure is a very rare occurrence! Ifthere
adjusting C2, and
correctly.
close, skip to test
l Verify
installed backwards, damaged, or Ll 1 is missing or open. Ifit is OVDC, check for
schematic and component
2. If the voltage is corect at the
adjusting C2
section ofthe oscillator
adjustrnent, the
3.
vary, then the
either a defective
4. To veri$ the bias voltages of transistors
It would be difficult and a mistake could
schematic and component
points. Stadby verirying the output of the 9 Volt regulator,
volts.
5. Ifthese voltages do
irstalled correctly.
and check.
placement
voltage
6.
Measure with an
7.
Now install a 51 obm
can obtain a voltage
broadcast
be
obtain
and/or
remove the
defective crystal.
8.
do so.
frequency for 24 hr. before
Just don't do
radio or HT
Oscillator
possible
With the volt meter,
Ifthe voltages check out OK,
Ifthey check out OK, its time
obtained with the
Ifthe oscillator
that the voltage at TP1 may be low,
For verification ofthis,
voltage
. The voltage
problem
problem is in
Emitter
=1.3
All of the resistors should check out with a ohm
of
Qi
(higher
any oscillation,
compress) so
Ifthe
than specified) assume
radio.
resistor in the Yl
oscillator
the final assembly.
for calibration!!!) and
Trouble
L1 is
L1
does not vary
#8.
jrmction
at the
placement
should
is
working
is in the main oscillator
probe
or its bias circuitry. Veriry the suspected transistor by following step 4.
Q2
placement
-2.2
volts. For
not
They may also have a solder bridge on the bottom side ofthe PCB.
and
ohm meter.
You should be able to
Ifthe hansistors
Q2.
-
(36
75 ohm will work) resistor
swing by varying C2,
specified L1 size, then the oscillator
also assume the same ifall
that
C2
is operating but the
shuts dorur
Shooting Section:
distorted enough or components are installed inconectly,
much from
perfonn
of L5 and
junction
vary. Adjust
junction
the
theQl
Q2,
out correctly,
check
veri$ that
for the final test. Repove the Yl crystal
is in the mid
position
r{ren the frequency
attempting re-adjusunent again.
If after re-adjustment, and
the following tests 1
CR1.
diagram.
of L5
correctly. Ifthe voltage stays high
of R5 and
circuitry. If it does vary and there is no change
Ql
occur
diagram for exposed leads ofother components that are connected to the desircd test
collector
are
found
that the
C4,
then veriS rafiat frequency
adjust
C2
position.
and re-install Y1
frequency
the Ll and
Ceprcitelce
but the oscillator is working
its specifications, it should be assumed that the oscillator is
This should
find
Ifyou
and CR1,
for minimum
C2
circuit.
Q2.
and
Q2,
by shorting
=
volts. Base = 1.3 - 2.2 volts. The Emitter is TPl.
9
you
need to make the deterrnination ifthe bias
to be installed inconecdy, or a solder bridge caused a wrong bias
transistor
C5 and C2 are installed correcuy and do
in the Y1
for 101 MHz lfnot, stretch
bias voltages are correct.
Leaving everything adjusted conectly,
and L2. Power the circuit up. If
not be netted, veriry that C2
can
gets
circuitry adjustnent
C2
-
Ifthe
8.
be 0.7VDC
error
an
probe
This
you
2 leads together and it would destroy the transistor. Examine the
is destroyed. You may still try it after
circuit is assembled
close, and C2
in assembly , correct it and restart the oscillator test.
junction
the
voltage.
voltage should vary'when C2 is adjusted. Ifit does not
need to measure
do not
VR 1
. Then
meter except R2 which is shorted with L1. Also verify the
position.
it is operating on with a an frequency meter or a FM
You may continue the testing and
you
are sure
perfectly.
oscillator is offfrequency,
+.0.3
VDC. Ifit is
of Rl5 and C24 with a volt meter while
If less
-
(6
check
is in mid
ofyour fiequency calibration
is
correct,
than 4 volts can be achieved, the multiplier
volts)
7
Apply
and doesn't vary dovnward during the
I . Collector
Q
and L2 inductor. Be careful with L2.
power
and
/or
wrong or
Ifyou
can
position,
return the crystal for replacement.
The crystals
you
may caude the oscillator to
is any voltage
a short
in the circuit
ofvoltage
these voltages at the transistors leads.
Remove the
not have
to the
compress L1.Ifthe frequency can
is defective. Ifyou
Ql
adjust the
power
it doesn't oscillate,
is in mid
allow the oscillator
used in this circuit are
peek
at TPl while
operating
(404.00000)
high,
CRI is missing,
after
on TP1, then the
=
9 volts. Base=1.5-2.5
resistors,
repair,
circuit
frequency,
down the
position.
assembly ofyour transverter.
chokes
from lhe enclosure
board
butit
arly solder
probe
and
Ifnot re-adjust L1 to
(do
but it is
R7.
Use
problem
and
is
unlikely!
shorts.
It is
TPl. Ifyou
can not
(stretch
Ll
set
circuit and
you
have a
to run
not use a
Ll are
brittle!
FM
is
not
at any
432-28_C.doc
File
I
*
DEv. 432-28
Revision c t2tl4tggpage 9
Page 11
Down
East Microwave
Phone:
908-996-3584
fnc. 954
(Voicd
Route
Local Oscillator 2 Testing:
perforrn
OnIy
positive lead
the
midrange
readjust
and
positioq repeat
with it. The final voltage should be approximately
for
Cl3
juction
be obtained,
LO1 trouble shooting section as a
this test ifthere is a crystal installed
ofa Voltneter to TP2. Adjust C13 for maximum
position
C13
yow
preferred
is
for maximurn
process
(see
diagram above). Ifthe capacitor is
voltage, the capacitor should
but this time compress coil L6.You may need
crystal frequency. Ifyour
ofC31 and R17 to verift fow
go
back to the Local Oscillator Trouble
guide
in the Y2
position.
voltage, note &trere
near
be
midrange, ifnot repeat. Ifthe
1.0 - 2.0 volts. If a frequency
frequency counter is capable
(4)
times the frequency ofthe crystal is
ofmeasuring up to 500MIIZ
Shooting Section. The LO I and LO2
by substituting the correct
designators on the component
Transmit Electrical Test :
The voltage checks listed below are for the transverter in the TX mode
power
DC
is connected to the transverter and the
mode. This is done by keying the PTT-L or PTT-H circuit. Either
depend on
how
you
have
configured
your
on the PCB. All voltages are referenced to
power
transverter. As
grormd.
(the
is in
switch
the on
grormd
you
enable the TX mode, a
enclosure)
519 Frenchtown,
908-996-3702
switch
the LO switch to the LO2
NJ
(Fax
the capacitor is
at the maximum
position,
spread coil L6, 1 to 2 tums
capacitor is at minimgrn
to wind a new coil
counter is available
with an extra turn and replace
probe
you
present.
If the volttge or frequency
circuits are identical.
placernent
with any oscillator enabled. After
position, place
+13.8V
or the
the transverter in the Transmit
supply will work. This will also
may
"click"
be
08825
position.
positioned.
TP2
and adjust
can also
heard
probe
Use the
and schematic.
verifing that the
from the relays
cormect
A
L6
the
can not
TEST Test Point Location
TX1
TR
connection
TX2 ANT connection near K2 and K2
TX3 TXON connections
TX4
TX5
RXON connections - All
TXLED connection
near Relav Kl
side of C56 Measure
-
All Positions Power
positions
TX6 Jturction of C45, C46, and C47
TX7
Across R23
TX8 Jwrction of C37 and Rl9
TX9
TXI O Junction
Leg
of C35 closest
ofL22 and CR5
TXI I Junction ofL27
TXI2 Jtrnction of
TXl3
Test Trouble shooting
TX
Failed
TEST
TXI
TX2
TX3
TX4
TX5
TX6
TX7
TX8
TX9
TXl
O
TXl1
TXI2
TXI3
Junction of C83 andICT
Missine
Defective
Defective
Defective
+13.8SW
K2
Kl, shorted
K1
R20 missins or shorted
VR3 Missins or shorted
low decrease the
If
If high,Rl9 wrong
If high, or
lf low, Rl8, L14,
If low, R31, L28
If high,
If low defective
low IC4 defective or
IC7
defective.
R33 andICT
to Rl9
and
CRl0
(if
installed)
(if
installed)
or TR
iumper
TXON voltage to
ground.
to
value ofR22,If
If low, Rl9 shorted or
value.
installed incorrectly
L22,missing .CR4 is backwards,
missing. CR9 is backwards,
If low, missing
installed incorrectly. If
IC7 or
Missing or defective
wires.
C45 installed backwards
High, Check value of
iumper
Probable causes
ground,
If defective all other tests
IC4 installed incorrectly.
damaged or
damaged or missine. If
wire, defective
highICT
defective
Q7 ,R29,
R23
IC7,
if
then
missing. If high,
solder
Correct Test Results
0.7 vDc rO.svDC
supply voltage
O VDC
Power
supply voltage
9.0r 0.5vDC
0.6 - 1.lVDC
r 1VDC
5.0
+
1.5
.5VDC
0.5vDC
0.8r
0.8r
0.5vDC
3.5 + lVDC
1.5 + 0.5vDC
or CR8
will fail
increase the
OK
high,
CRl0
short, wrong value R33
value of R22
is bactravards or damaged
CR5
is
backwards
short with Ohm meter
or damaged
**If
any of the
File 432-28_C.doc
Transmit tests
fail, repair or consult
Down East Microwave before
I
DEv- 4iz-28 Revision c t2ttutglpage 10
*
proceeding
with
the Kit!!!**
Page 12
Down
East
Microwave
Phone:
Inc. 954
908-996-3584
Route
orce 908-996-3702
519
Frenchtown,
(Fux
IVJ 08825
If
all the test
for frequency
used
later
time,
nothing was shorted
pass, go
install
page
to
stability and does not ne€d
the rest ofthe 4-40 nuts
on the
I 8
of this document for instructions
on the top side ofthe PCB
PCB
after assembly. The
POWER MODULE INSTALLATION
Place
past
enclosure
a thin even coating of thermal compourd
leads
floor
power
floor
module
and
the
the mounting
with the traces ofthe circuit board. Install
altd tighten wenly. Then forming
(IC5)
on
the enclosure
pads,
they should be approdrately 3/8" long
flange
of IC5 to verifu the surfaces
the
LED INSTALLATION:
Note: The longer lead
.
Prepare
from
.
Place
ground plane
.
Cut the
o
Connect the
")(I\4IT'LED.
o
Place the
o
Form
.
Tack solder tlle
")O\4IT"
tlle
longer lead.
the
")C\flT"LED
the
positive
positive
"ON'
the
circuit close
lead ofthe
#26 Teflon
LED
grould
on the LED is
LED
in
wire
lead ofthe
so that the body
side ofthe
positive.
by supporting the SHORT lead
the wall mounting hole
to the edge ofboard and solder.
")Cr4IT'
from
"ON'
LED
the hol6 in the PCB near labeled TXLED,
LED in the hole by R4l labeled
"On"
of mounting
installed
to be
proceed
floor
to tlrc mounting flange.
two
leads flat
to approximately
fits into
LED to the
at this
time but it is convenient.
below wit the
in its mounting location
once trimmed.
are
6-32
to the traces,
(see
hole in
the
ground
any
/ree
x 3/8" screws
(negative)
Figure 5)
3/8". Form a "I'
the enclosure.
plane
PTC-50
the
and repeat a few
power
module installation.
and
foreign
Place IC5
solder all leads ofIC5
and
matter
on the enclosure floor
through the mounting flange into
at the LED
place
the
LED.
ON
Thermistor.
ffyou wish
of the electrical
trim the
Wipe the mounting
previously
in the lead
to the
leads
and deep scratches
to the circuit board.
body, bend the
"I'
The Thermistor
install
to
tests to veri&
so
they do
surfaces ofthe
before applying
lining
while
lead
formed
by bending with
formed
lead on the
positive
it
at a
that
not
extend
up
the
the enclosue
90'away
pliers.
lead
on the
is
PCB assembly
.
Corn:ect a
the wire to the
a wire there already.) Connect and solder the
lead
to the
.
Co rect the
.
Connect the
432 - 28 User Options
DEM
The following final assembly
suggestions
Common
tranwerter or use
Add an external
nast
IMD
CommOn
10 watts.
Split
preamplifier
Auxiliary
will help
Antenna
mounted
performance, and reduce the dynamic
lF Option, If
/ TX Ports
RX
and
Switching
into the extemal enclosure, continued
piece
of#18
pad
labeled
pin
center
#22 Teflon
#22 Teflon wire from the stard alone
you
a solid state amplifier
preamplifier
preamplifier,
sequenced switching
of the
decide which options
for both transmit and
this option
you
for high
contacts. Used
Blue
TeIlon wire from the wall mounted DC
+13.8V
jack,
from
wire
instructions
near
negative to the ring
the stand alone
power
the
cover all
you
will want to
output
100FF
capacitor to the
ground
hole in
hole in
of the options that are available
install.
receive. If
with antenna.switching built
and bypass
is
suggested.
range
use and
transceiver with a single
power
schemes, zuch as
ofthe transverter
amplifier use.
for external switching
the internal
Any additional
a EME station, assemble
powerjack
module
terminal.
PCB labeled RXIF
the
PCB labeled T)(IF
the
you plan
in,
L16.
and
DC
to connect a antenra
tlis assembly.
do
powerjack,
(13.8VDC)
Solder it to the surface
to the
to the
GaAs-FET.
gain
in ftont ofthe stock tranwerter
by the amount of
tranwerter
you plan
If
circuils or to
additional
port
a transceiver with a
or
use a tube tj?e amplifier with
to
this option.
hard key a solid state amplifier.
observed
BNC RX
BNC TX
for
this
you plan
tf
gain.
and solder, then
(Note:
There is
polarity,
kit. This list
jack
iack
positive
and solder.
and solder.
of
directly to tle
to use a external
will degrade the
power
level up to
extemal
route
or
tnstall
desired.
432-28
File
the TXIF
C.doc
or RXIF
gain
stages. only
if
#
the
TX
drive
432-28 Revision
DB,l{
is low
from
the transceiver.
C 08/16/00
Page 11
only
if RX
gain
is
Page 13
Down East Microwave
Phone:
908-996-3584
fnc.
954 Route
(Voice
519 Frenchtown, NJ
908-996-3702
(Fax
08825
Common Antenna for both transmit
Prepare the conrn:on output coaxial cable as follows;
Cut the coax 2" - 2 1/32" long.
Remove the outer insulation
Rernove the braided shield %" from
Remove the braided shield 1/8" from the other side.
Remove the center conductor insulation from each
conductor wire to
Solder tin the center conductor on both ends and solder tin the shield on the %" end.
Bend the center conductor on the
Position the %" stripped end on the circuit board by
"ANT".
Angle the coax so that
This hole is located near relay labeled K2.
Solder the shield to
conductor in the
Route the coaxial cable around the relay to the solder lug on the wall mounted
Solder
-1116"
it is facing K1.
the
'ANT"
the shield to the solder lug, then solder the center conductor to the
from one end and %" from the
%"
the %" stripped side.
prevent
to
ground
longer
hole.
shorting.
stripped end 90"
(See
Figure
area adjacent
and
end
7)
to
receive
(See
Figue
allowing
placing
the
the center conductor in the hole on the board labeled
"ANT"
-2.0
-
6)
other.
an extension out of the'remaining shield.
hole
for the center conductor, then solder the celrter
2 1132"
\
'N'
connector screws.
'N'
connector center
the
Cut
pin
as in figure 3A'.
centel
Figure
Figure 6 Gable shown broken for clarity
7 Coaxial Cable mounting
RG/188 COAX
CABLE
COMMON'N'
on PCB shaded oreos are solder
points
432-28_C.doc
File
I
Dr;v^ 432-28 Revision c tztt4tggpage 12
*
Page 14
Down East Microwave fnc.
Phone:
908-996-3584
954 Route 519 Frenchtown,
(Voice
908-996-3702
(Fax
NJ
08825
Add
an external
On the following
preamplifier.
The transverter
Refer to
1.
RX input. Unsolder and
you
If
2.
coax to
you
If
3.
from the
RXI
page
It is recommended that ifyou use a extemal or mast mount
may be configured this way very easily.
the component
not
wish to have
do
connect the new
to
wish
R24
Gaasfet
preamplifier
is block
placement
lift up the end
RX input
use the
still
pad
new RX input.
to the
pole
2
diagram
diagram and reposition C61 to connect
the receive
to the spare N connector.
T/R relay
MMIC
and bypass the internal
receive
ofthe
R27 that is attached to
of
signal
in the transverter, remove
converter.
routed
through
RX Standard
Pole
3
RX
Option
Pole
2
Mixer
MMIC
It
shows the standard and an option ofusing an external
Q6.
the T/R relay in the transverter, use a
R24
GaAs-FET
preamplifier, you
F4
to the tnused
and C57
Low
from
Pass
the
MMIC
should bypass the intemal one.
pad
by F4. This is now
small length of
PCB. Then
run a
jumper
coax
the
Common
East Microwave
complete with
Split RX
l. Remove chip
Z.Prepare a2"
3. Attach
The RX input
relay will fi.rnction
you
decide
Remove and
4.
5. Remove the
lF option
A common
Inc. for details. Options with up
a new component
/ TX Ports
capacitor C56
piece
the other end
can be left assembled
to remove
replace C57 andR24 as shown
coax from the
IF option is available for this
placement
for high
from
ofRG/188
of the coax to the spare
nomrally and will open
the K2 relay
coax or similar
from fte circuit do step
ANT comection on the
diagram.
power
original
the way it is.
position
fhe circuit to the
transverter. Ifinterested it can be supplied as
to 10 watts input
amplifier
place
and
and attach it to the newC56
'dP'
type
This will
in diagram below.
cofflector. Use
provide
4 ald 5'
PcB and attach it to the
power
are available.
use
were shown on diagram below.
the
additional
RX input. But this
placement as shown.
other
receiver isolation during
will not
new
It is
comector as
protect
position
a kit. Please
installed and comes
easily
a sample.
transmit.
an extemal
shown.
consult
preamplifier.
Down
The K2
IF
File
432-28
C.doc
I
4t2-28 Revision c
DEv^
*
tztt4tglpage
13
Page 15
RG/l88
CAB LE
COAX
Down
East
Microwave
Phone:
fnc.
954
908-996-3584
Route
(Voice)
519
Frenchtown,
908-996-3702
o
NJ
(Fax
0BB2S
RX
G/I88
CAB
COAX
LE
Auxiliary
The
comection
fransverter
AIIX
Install
transceiver
power.
ICT Then
board!
on the IC.
stage
will
decrease
can be
is in transmit
comector
the TXIF
You
has less tban I mW
All ofthe
remove
Then form the leads
The
will increas€
Switching
auxiliary contacts
whed to
on the enclosure.
contacts.
ground
or receive.
or RXIF
may require
associated
same thing may
your
your
systems d),namic
additional gain
bias componenls
the ribs as shown
ofthe IC7
be done with
gain
IF
in Kl
are labeled
+13.8
or
gain
output
and
will not improve your
range if
VDC.
The
contacts
stages.
on either
on its transverter port,
are
below
Cut them
so that
it lays flat on
RXIF. Note
you
(common)
C
This
will then
are marked
the TXIF
installed
have already installed
and tested.
with a razor
the circuit
the dot
system's
(norrnally
NO
be connected
for the
receive morle.
or RXIF
install IC7
Refer to the
knife and
board.
on the IC before
noise figuxe.
o
open)
and
want to install
will
enable the
heat
Solder it into
a exterral
and NC
or dis-cormected
The
component placement
with a solder iron.
installing.
Refer to the
preamplifier.
(normally
depending
NO
or NC can
either IC7
fansvert€r
place
Caution! Installing
to
paying
circuit description.
closed).
be whed to
or IC8.
produce
diagram
They
will
ittendon
The
C
on wearher
the
Ifyoru
f,rll
output
and'locate
jump
off the
to the
gain
this
This
stage
the
Dot
File
432-28
C.doc
IC7
& IC8 Installation
I
DE.v. 432-28
*
O
R em
P rio
In
sta
ove
all
r
f o
IC
lla tio
Revision
R ib s
n
c rzn4rglpage
14
Page 16
Down
East
Microwave
Phone:
fnc.
954 Route
908-996-3584
(Voice
519 Frenchtown,
908-996-3702
(Fsx
NJ 08825
Transverter
The
assembly
transverter to
Connect
follow theil instructions for interfacing.
the
steps
1 . Depending on the make and model of
Follow ratratever instructions
requircs a special comector
2. Connect all IF cables. Both receive and
to connect the 28 MHz. transverter
3. Connect the Push to Talk line out
and uses a RCA connector. The conect keying
4. Co lect the 70cm antennea system or a durnmy load
split
Place a signal
5. Connect the DC
operate normally from 12 to l5 volts.
6. Preset the TXIF and RXIF
firlly clockwise.( minimum attenuation)
Power
7.
Apply
8.
not. Set the local oscillator switch to 432MIIZ.
9. Adjust the RXIF
movement
may
tle band or use a signal
signals such as local repeaters will be attenuated iftheir output frequency is
10. To test the trarsmit section,
mode because most transceivers have carrier level controls in this mode
to test the transverter if it has a
maximum output
output
observing the
control to maximum on the hansceiver. Ifthe tansverter is configured correctly for
may
direction while observing the
available,
of 6 amps
amps
pass
transmission. The
not be obtained,
I l. You
oscillator Aequency do
you
12. Put ttre top on the enclosure and
your
in
portion
your
your
listed
transmit and receive
your
power
in
increased
be
power.
detected on the 70 cm
be
you
should be obtained and it should vary as the TXIF control is varied. If 30 watts can not be obtained
of cuxrent drain, then with an insulated tool, stetch or compress the Ll7, Ll8, an Ll9 inductors in the output low
filter. This will also help efficiency. After
may re-adjust both RXIF and TXIF again ifdesired. The adjustments ofthe
have access to a spectrum analyzer at
70cm system and
ofyour kit is complete.
IF rig:
You will now
transceiver to the transverter:
Interfacing the transverter to
below.
you
have in
cable
or
ports
ofyour tansceiver to the transverter. It is
sections one ofthe
generator
power
transceiver
to the transverter
the
Place the tarsceiver into transmit. Note the transmit LED on the transverter. It should
power
may use a current meter on the DC
it could be a IF drive
or an antenna on tlrc receive
to the transverter. It
gain
controls. Tum
on and
gain
control counter-clockwise until a
meter
"S"
beyond
generator
power
with a transceiver in these modes. Set the carrier/output
meter on the 70cm system, slowly increase the carrier control
power
not need to be touched but
leave
and tum on the
is detected. Powff the transverter on and offto veri!
point,
this
to determine
place youx
power
power
power
output and current
install
have fun!
the hansceiver is easy. Ifyour
If the transverter was assembled
your
transceiver, it may or may not
your
transceiver's
assembly, it should be made now
hanslnit are BNC connections
your
from
type should have been configured for
'T.{"
connectors is the transnit
uses a RCA
the TXIF firlly counter-clockwise
it in the Receive mode on 28.100 MHz.
power
it
but
will start to degrade the dynamic range
correct
transceiver in the
output control. Do not use SSB or AM
meter. Now slowly adjust the TXIF control in the transverter in
meter.
problem.
the screws.
it
Set
to obtain a maximum of 30 watts maximum. If a
power
proper
drain
should
Please consult Down East Microwave Inc.
minimum.
Final Tune
proceed
transceiver to the TXIF
with a
connector.
b?e
switch. The
slight
frequency,
CW
line to determine if the
power
conelate to
you
may ifyou wish. Do not adjust any ofthe helical filters unless
Your
transverter system is
with the fural
for direct comection
operation manual to
or contact Dotvn East
on the transverter. Use
powff
meter to the transverter
comector. 13.8 volts is
power
noise increase
or minimum detected signal level.
mode.
It is recommended to test the transverter in
only.
is
obtained switch the hansceiver to USB and
your
Up
hme up as follows, after
transceiver requires a DEM
youx
to
be necessary to enable the
enable transverter operation. Ifit
Microwave for assistance.
good quality
and RXIF connectors on the
labeled PTT-H or PTT-L
your
tansceiver during assernbly.
. Ifyou chose to assemble
side. Put the
(maximum
LED
should
is heard in the transceiver
above 438 MHz or below 430 MHz.
Ifyour
because
power
transverter
speech
ready
porver
meter or load
optimum but the transverter will
attenuation) and the RXIF
light
and the trarsrrit LED should
the change in noise. The RXIF
ofyour transceiver. Find a signal on
tansceiver has FM, it may be use
it is not possible
control
(with
your
pattern.
receive
to use. Connect as
to
key down)
transceiver,
is
transmitting. A maximum
Ifa minimun of25 watts can
preamplifier
cormecting
TIB or AOS,
transceiver, follow
transverter
on the transverter
or
Out ofband
to obtain
minimum
be on. While
porryer
or
minimal power
a clockwise
power
meter is not
and local
you
ports.
coax cable
transverter.
there.
just
a slight
gain
the CW
or
"0"
output
with 6
make
a
wish to use it
your
File 432-28 C.doc
I
*
Dliv' 432-28
Revision c l2tt4tglpage 15
Page 17
Down
Eust Microwuve
Phone:
908-996-3584
Inc. 954 Route
(Voice)
519
Frenchtown,
908-996-3702
^{J
@ax
08825
BAG T
Resistors values
the values are
Rl 470 P.t2 47
R2 680 Rl3 I00
R3
1.5K Rl4
R4 100 R15 330
R5 47 Rl6 220
R6 100 R17 lBO
R7
IK Rl8
R 470 R19 240
Re 680 R20
R10 1.5K R21 100
Rl1 100
in
are
Ohms and are %W unless otherwise
pF
unless otlrcrwise specified. A1l
IK
%W
CC
t/z
W
%W
CC
IK
410
l.5K
R22
BAG2
All capacitors are disc ceramic and are
"SM'=Surface Mount "Ttf'=Thru-Hole
(102)
lo00
cl
l-6 Trimmer TH
C2
1000 cl8
c3
15
c4
39
c5
c6 1000 c21
1000 c22
c7
2.2wF ELECTR
CB
2.2uF ELECTR
C9
1000
c10
1000 c26 10
cl1
1000 c27
c12
1-6 Trimrner
Cl3
1000 c29
cl4
15
c15
TH
39
ct6
1000
c17
1000
2.2uF ELECTR
Cr9
2.2uF ELECTR
C20
1000
1000
t20
c23
120
c24
0.1uF
C25
l0
r20
c28
r20
0.1uF
C30
DEM 432-28
chips are attached
R23 r0
R24 lK
R25 24
Pt26 24
R27 100
R28 180
R29
R30 47
R3I
R32 180
R33 330
pF
unless otherwise
CHIP R36 220
CHIP
IK
lK
c31
C32
c33
c34
c35
c36
c37
c38
C39
c40
c4r
c42
c43
C44
C45
Component List
specified. CC = carbon
on a
220
R34
CHIP R35
%W CC R38
% W P.39
% W
specified.
t20
0.lrrF
120
r20
120
1000
t20
1000
0.1uF
1000
1000
r20
r20
ELECTR
2.2uF
2.2uF ELECTR
lK
220
Pt37
IK
220
R41IK
1OOO
C46
0.1uF
C47
0.luF
C48
1OOO
C49
"ELECTR"
i
separate
POT
POT
CHIP
CHIP
CHIP
CHIP
2.2uF ELECTR
C52
2.2wF ELECTR
C53
C57 l-6
l-6 Trimmer
C58
120
c62
c63 t20
2.2uF
C64
2.2rfi ELECTR
C65
1000
c66
120
c67
1000
c68
1000
c69
1000 PTC.5O
c70
39
C7I
T8
C72
composition.
card in Bag l.
C50
C51
C54
C55
C56
C59
C60
C61
=
Electrolytic
Trimmer
ELECTR
Capacitors are chips
0.lrrF
CHIP
1OOO
CHIP
6.8
6.8
IOO
0.1uF
0.
l
1OOO
ATC
CHIP
CHIP ATC
CHIP ATC
CHIP
uF CHIP
CHIP
'Trimmer"
c73 120
1000
c74
SM c75
SM c76
270
270
1000
c77
0.1
C78
c79
c80 1000
c8l
C82
c83
c90
uF
1000
1000
0.luF
1000
1000
=
Variables
and
BAG 3
Hand wound
tolerance
Ll 9
L2
L3 l.0pH
L4 1.0pH
L5
L6 9
Li
L8 l.OpH
L9
Ll0
File
bards.
Turns
0.33rrH
1.0pH
Turns l/8" ID
pH (ORANGE/ORANGE)
0.33
1.OpH
l.0pH
432-28 C.doc
(HW)
inductors are
Please identiry desired value by the'significant
1/8" ID
(ORANGE/ORANGE)
(Black
(Black
(Black
(Black
(Black
(Black
(HW)
Body)
Body) Ll4
Body)
(HW)
Body)
Body)
Bodv)
#24
enamel
wire, close would. All molded chokes have GOLD or SILVER multiplier and
l 1.0pH
Ll
LI2
Ll3 3 Turns
Lls
L16
Ll7 2 Turns 1/8"
Ll8
Llg 2 Turns 1/8" ID
L20 3 Turns l/8"
(Black
4
Turns 1/8" ID
(Black
l.OpH
yt"H (YELLOW/VIOLET)
0.47
(Black
1.0pH
3 Turns l/8" ID
color band combination.
Body) L2I
(HW)
l/8" [D
#
(HW)
Body)
Body)
(HW)
ID
(HW)
(HW)
(HW)
432-28 Revision C 08/16/00 Pase 16
DENI
0.4'7wH(YELLOWVIOLET
L22 3
L23 0.33
L24 0.22uH
L2s
L26
L27 0.33uH
L28 l.OpH
4'
2'
Turns 1/8"
uH
0.22*H
0.22wH
#24
Teflon Wire
#24
Enamel wire
(HW)
(ORANGE/ORANGE)
REDIRED)
(RED/RED)
(RED/RED)
(ORANGE/ORANGE)
(Black
Body)
Page 18
Down East
Phone:
Microwuve
908-996-3584
fnc. 954
(Voicd
Route
519
Frenchtown,
908-996-3702
IVJ 08825
(Fux
4
BAG
Ml TUF-IH Mixer
2N5179 Metal
Ql
MPS517e
Q2
2N5179 Metal
Q:
MPS5179
Q+
MRF559
05
ATF21 186
QO
PN2222
QZ
MPN34O4
CRl
MPN34O4
CR2
cR3
CR4
CR5
CR6
CR7
CR8
CR9
CR1O
A3t'41/tid)
MPN34O4
MPN34O4
1N4000
1N4000 tvpe F4
1N914
MPN34O4
MPN34O4
can
can
or 940P1
DEM 432-28
1359-l
or
Component List
ICl
MAR8
IC2 MAR3
IC3 MAVI
IC4
MAR3
IC6 MAV1
IC7 MAR6
IC8
MAVll
continued
I
l
(TXIF
(RXIF
vRl 78L09
vR2 78L09
78SO9CV
VR3
vR4 78L09
Fl TOKO 1547
F2 TOKO 13s4
tvpe F3 TOKO 2s37
TOKO 2s37
or 1N4148
(ORANGE
GLASS
BODY)
Yl
Kl
K2
Crystal
G5V.2
GGY
101.000 lvffIz 5h
Gain, optional)
Gain,
optional)
Overtone
HC 18/U
HARDWARE
(2)
LED, RED
2)
SWitCh SPST
2)
3)
(2)
13) 4-40 x 5/8"
26) 4-40
Miscellaneous
MPN3404
o--E{----o
Female
BNC
RCA Jacks
"N"
6-32 x 3/8" Machine
Nuts
Parts:
diode
KIT
UG1094AJ
-
Control.
Connector and
Cap
Aux..
Screws
Screws
(1)
RF Power Module IC5,M57745
(4)
Adhesive
Teflon
#22
#18 Teflon
RG/188U Mini
(1)
Connectors
Power
hardware l) Machined Heatsink 8
Power Module l) Label
for
Machined Die
l) 3132" Allen kev
(1)
MPS5179 Translstor
Backed
Wire
Wire
Set
Printed
Rubber Feet
4"
4"
6"
Coax
cast enclosure
wrench
Circuit
Board
78L09
t/2"
Regulator
2N5179 Transister
Can
Metal
432-28 C.doc
File
BOTTON4
I
432-28 Revision c 0s/16/00
*
DE.v_
page
t7
Page 19
Down East
Phone:
Microwove
908-996-3584
Inc.
954 Route
(Voice,
519
Frenchtown,
908-996-3702
NJ
(Fax,
08825
PTC-50
Although irxtallation
final
wiring is completed. Because it is important
the thermistor,
or install it now. We at the Down East
oscillator has aged for 24 hours.
frequency drift for the fust 24 hours
To install
the 3", #18 wire from their RCAjacks. Then remove
the 2, 4-40 nuts
Locate the thermistor and retnove one ofthe attached wires
diagram below. Note
case with an iron and
wire in the molten
where the crystal and Q I almost touch Heat the case of Q 1 with
crystal. Allowto cool and then inspect for a
local
oscillator
operation, the frequency stability may not be that important because ofthe Doppler
You may now re-install the PC board in the enclosure and continue the assembly on
attachment ofthe thermistor
attach€d to
be
Connecting the thermistor wire to the center
transverter $ on.
double
some
thermistor
the
the PCB
and
that
flow
pool
is
used,
center ofthe LO switch of in the exra hole on the PC board marked with an + by the LO2 corurection.
the
ofthe PTC-50 thennistor may
work is required. You may
Microwave lnc. Factory install
(a
bum in
corectly, remove the PCB ftom the
should come out ofthe enclosure.
the therrnistor is attached by solder to the crystal.
some solder on it. Then while still heating the
of solder and remove the iron. Now before allowing
a thermistor may be installed
wire
to the center
period)
of operation.
Therm istor installation
done
be
to determine if the oscillator
complete the assembly
You may do the same
both the LO and the Pouer
good
solid connection. If in doubt, re-flow and add more
to that crystal also but ifthe second oscillator is used for satellite
post
post
ofthe LO
will
always
switch.
keep both,oscillators in
at any time, it is most
circuit is 100% firnctional
ofthe
the thermistor after complete
but it is not required. Just
enclosure. To do this, un-solder
switches
with some heat from a solder iron.
Start by
place the
case,
the crystal / thermistor assembly to cool, note
your
iron and flow a bead
If the second
convenient to do it
before installing
transverter
tinrfng
side ofthe thermistor without the
shift.
themristor
'fiot
then install the thermistor
assembly and the
expect to see some
the PTT wire, and
from
the enclosure. Next remove
Then
the case of the crystal. Heat
of solder so that
page
I l. Only
is installed,
standby'' as long as the
it
solder.
now
lhe
before the
review
the
the
attaches to the
Ifthe
second
include the
wire may also
Some important notes. The crystal
path
DC
the oscillator
for the thermistor through the case
transistor. Ifthe solder bead
Wire
LO Switch
needs to
ground
is not attached to the transistor. the thermistor will no! heat up!
be attached
ofthe
to the
fansistor and the other is to maintain a constant temperatue of
Ql
or
transistor for 2 reasons. One is to
Q3
Solder
to
T[ermlster
Solder
provide
a
File 432-28 C.doc
Proper
Attachment
of
I
*
Thermistor
432-28 Revision c
DEv_
Crystal
to
lltl4tggPage
18
Page 20
Page 21
432-?A
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