DEMI DEM-3456-144CK User guide

DEM 9 CM Transverter Kits

3456-144CK, 3456CK, 3456BK and 3456K

Specifications

Frequency: 3456 MHz. = 144 MHz.
Noise Figure and Gain: <2.0 dB nom. > 20 dB Gain
Power Out 3456-144CK: 1W nominal
Power Out 3456CK, BK, or K: > 40mW
IF Power Input (model dependent): 1 mW to 10 W with TC
DC Power 3456-144CK: (1 W Kit) 10 - 15.5 VDC @ 1.0 A
DC Power 3456BK: (40 mW) Regulated 9.0 VDC @ 300 mA.
DC Power 3456CK: (40 mW) 10 - 15.5 VDC @ 500mA
DC power 3456K: (40mW) Regulated 9.0 VDC @ 500 mA

Preliminary:

The 3456-144CK is a complete kit that will produce > 1 watt output on 3456 MHz. with up to
10 watts of drive on 144 MHz. It is exactly what we use to produce our DEM3456-144. It consists
of 3 separate boards kits, the transverter PCB kit, (the 3456BK), the DEM TC IF switch kit, and the
A32 synthesizer. A hardware kit and the 1 watt PA kit finish the 1 watt version. The DEM TC
enables the use of any 144 MHz drive level up to 10 watts, provides the regulated +9VDC, and
supplies all of the switching voltage functions including a TR switch control. The A32 synthesizer
(which replaces the DEM MICRO-LOK) is now the standard LO that drives the multiplier stage of
the transverter. This synthesizer has the ability to have its frequency changed with a switch to
enable the transverter to operate on other portions of the band or to use a different IF frequency in
the 2M band. The A32 requires an external 10 MHz source unless the internal 10 MHz clock option
( OPT-I) is ordered. All of the circuit boards have been engineered for a regulated 9 Volt operation
for stable operation at home or for portable operation. After completion, you will just need a 3456
MHz. RF Transfer Relay, (a WTR option is available) an antenna, and a 2 meter IF transceiver of
10 watts or less to get you on the air!
The transverter may be ordered as a low power (40 mW max) kit as the 3456CK. It is the
same as the 3456-144CK with the enclosure but without the PA components. A board kit only
version without the enclosure and hardware is called the 3456BK. It is the 3 board basic kit. The
transverter board kit is the 3456K. It will require a 1 GHz range LO. The PCB alone for you own
projects may be ordered as the 3456PCB

Additional Options:

Additional options may be implemented depending on your requirements. You may use
your own enclosures or oscillators and frequency combinations (If you have the 3456K and BK).
The transverter is designed with this in mind. The DEM TC controls all switching functions DC and
IF. If a lower system noise figure is desired, there is a 9 cm PHEMT preamplifier available. It is
part number 9ULNAK (PC board kit) or 9ULNACK (complete kit with enclosure and connectors.)
As a kit, the multiple frequency option is included with the A32. But unless you have a 10 MHz
source, you will need the OPT-I option to operate the transverter.

Assembly Considerations:

With all transverter kits except the 3456BK, assemble the DEM TC per their provided
documents and test individually. The A32 may have its frequency selected using the matrix
provided with its document. It’s output power is preset to drive the LO multiplier of the transverter

/Kits/3456CKA32-RevB.doc 1 Rev. B 8/17/2010

at the correct level but could be tested with a 9 volt supply voltage. This will verify the “LOC” circuit
and whatever 10 MHz source is utilized. The frequency can be checked and the 10 MHz source
trimmed up.

The TCK operates depending on the IF level required. A maximum of a 10W, common or
separate IF input may be used by adjusting the built in attenuator values or bypassing the IF switch
for split IF transmit and receive operation. Unregulated voltage may be supplied to the TC. The
regulated 9 VDC is then available from a common connection on the TC board. Connection points
are shown for AUX voltages such as TX LED, +9V, VRX and VTX on the TC board wiring diagram
in this document. A RX gain stage provision is included on the TC board but is not recommended
to use unless you have an excessive IF coax length.

Receive Assembly Options:

(Refer to component placement diagrams for details. After a

decision is made, mark your component placement diagram to indicate the changes).
The receive conversion gain of this transverter in stock form could be as much as 24 dB.

You may wish to install a Low noise amplifier to reduce the system noise figure such as the DEM
9ULNA. The following 5 examples and recommendations will assume the mentioned preamp to
have 16 dB gain and a 0.7 dB Noise figure.

Example 1. If the preamp is to be used directly connected to the transverter, do not install U1, R1
and R2. Place a wire jumper across the U1 and R1 position. Solder this jumper directly to the
circuit board as if it was part of the transmission line. No bumps please!

Example 2. If a mast mount preamp is used and the length of coax used between the preamp
and transverter has up to 6 dB loss, you may not have enough receive system gain if U1 is
removed. In this case, it is suggested that the MGA86576 should be installed in the U2 position.
This will utilize the filters in the transverter (for out of band interference) and provide enough gain
to overcome the loss of the mixer. When doing this, the correct bias resistor should be installed.
There is an optional 200 ohm resistor in the kit and it should be used for R4. Then follow the
instructions in Example 1.

Example 3. If a mast mount preamp is used and the loss of the coax between the preamp and
transverter is between 6 and 12 dB, the extra ERA-1 should be installed in the U1 position. A
jumper should be installed in the R1 position and R2 should be replaced with a 130 ohm resistor.
Then install a jumper for R3. U2 and R4 should be installed as normal.

Example 4. If there is more than 12 dB loss in the coax between the preamp and the transverter,
reverse the positions of U1 and U2. This is a strange set-up but the system noise figure is already
degraded because of the coax loss and any improvements in the gain of the transverter will not
improve the total system noise figure. For this reason, if excess gain is used before filtering, there
may be an increase of out of band interference occurring. This set-up will eliminate as much out
of band interference as possible yet maintain enough system gain. After U1 and U2 are reversed,
replace R2 with a 130 ohm and use a jumper for R3. Then use the optional 200 resistor for R4.
Install a jumper for R1. It is then recommended to try to increase the gain of the external preamp.
If by doing so, it degrades its noise figure, it will still improve the systems noise figure. BUT!!-If you
increase the gain by as much as the loss of the coax, (adding another preamp) do not install a
MMIC in the U1 slot.

Example 5. If you feel that you require as much receive gain as possible, and use a mast mount
LNA in front of the stock transverter, install a band pass filter between the LNA and the transverter.

/Kits/3456CKA32-RevB.doc 2 Rev. B 8/17/2010

LNA’s do have a wide band response and the MGA86576 (U1) has over 20 dB of gain from 1-6
GHz. It would be possible to have out of band signals amplified by as much as 40 dB before
filtering if an external filter is not used! If a system like this is used without a filter for portable use
at most mountain top locations, it would be a high probability that the receive system will be
degraded. In a densely populated microwave environment, such as a mountain top, a preamplifier
may hinder your receive signals. Be prepared to remove your preamplifier if interference persists!

Transmit Assembly Options: (Refer to component placement diagram for details and indicate
the changes made to suite your requirements before assembly.)

If you are planning to use this transverter to drive a TWT type power amplifier or low level
solid state amplifier, do not use the 1 watt option in the 3456-144CK. In the 3456-144CK, there is
a provision to adjust the TX output power level with a IF attenuator. Even if this is set correctly, the
1 watt power amplifier could oscillate and produce a signal strong enough to destroy the TWT.
The 1 watt transverter may still be assembled and tested, but if using a TWT, use the low power
option of the transverter. Disconnect C31A and R23 after testing the 1 watt section and Install
C31B. This will bypass the 1 watt stage and then may be operated without damage. Even with
the standard MMIC line up used in all kits, there should be a minimum of 40 mW (+16dbm) of
output power. This power may still not be low enough for a TWT. If not, install a attenuator pad on
the input of the external amplifier or install a jumper for U11. This should lower the maximum
power to +5 dBm and will also improve the local oscillator leakage that most TWT’s would amplify
anyway!!! The output power level could then be adjusted down to -15dBm with the TXIF
adjustment if needed.

Review all of the components in the transverter kit and remember that the instructions
assumes you have a complete 1 watt kit. If you have a basic kit, (3456BK) assembly the
transverter board by the component placement diagram after it is attached to some type of
enclosure (Brass walls). You may need to provide additional support to keep the transverter board
from flexing before assembly. The flexing will break the surface mount components as you solder
them! That doesn’t sound like fun at all!

Assembly:

1. First check all MMIC mounting holes for excessive plating or lose trace material. The holes
are drilled after the plating process. A Ohm Meter may not tell the whole story. A thin trace of
copper may encircle the mounting hole. When the MMIC is placed in the hole and soldered to the
circuit, the trace will short all leads to ground. This is a common problem with a circuit board of this
type. Inspect and remove any trace that may exist with a sharp knife if needed. Do not cut into the
ground area with the vias. When complete, if you have the 1 watt option, install and solder IC1
and R19. Then cut the excessive length leads off before mounting the board to the pallet with 10,
4-40 x 1/8” screws. If you are assembling the low power version, just mount the board to the pallet
after inspecting the MMIC’s mounting holes. Also notice that there are 4 holes in the mounting
plate that are clearance holes. These are for mounting the plate to the housing. When complete,
the PCB should be square on the pallet and may have some material hanging over the edge of the
pallet. With a sharp knife, and using the pallet as a square edge, trim the board edges flush with
the pallet.

2. Using the component placement guide, and after determining what options you may want,
begin the component assembly. Start by soldering all MMIC’s first. All MMIC’s sit down into a hole

/Kits/3456CKA32-RevB.doc 3 Rev. B 8/17/2010

squarely except for U1. Be sure that they are flat!!! Align the dots of the MMIC’s per the
component placement diagram. When soldering, avoid solder bridges between input or output
leads and ground. After soldering, check input and output leads of MMIC’s for a short to ground
with ohm meter. If any shorts are found, wick off excess solder from shorted lead and check again.
Re-solder if needed.

3. Next solder the passive surface mount components. Pick an area on the circuit board and
assemble per the component placement guide. Some capacitors and resistors share the same
pads. Solder the shared pads last by attaching the component to the non-shared pad first. Make
sure all components are down flat after soldering the first side so they don’t fracture when the
second side is soldered. If you plan to test the Local oscillator power output of the transverter
board, install C7 on the LO test pad.

4. After reviewing all soldering and component placement, use the rear panel as a guide to
trim the Teflon on the SMA connectors. Trim the Teflon of the SMA’s flush with the panel then
attach the SMA connectors with the 3-48 screws to the panel and pallet (long screws go into the
pallet!) Tighten the screws and be sure that the Teflon does not extend beyond the panel or
creates a gap between the panel and the plate. If there is a gap, remove and re-trim the SMA’s ,
then re-attach. Solder the center pins only after the screws are tight!!!!! Now install the BNC and
RCA connectors. Attach 1000ρF bypass capacitors on the 13.8VDC ,PTT and AUX between the
RCA connectors and ground lug bolted to bottom of pallet. Pick a taped screw hole and use 4-40 x
1/8” screw to attach the ground lug.

5. Attach bias wires to VRX, VTX and +9 through the bottom of the pallet clearance holes.
This is done by pulling the wires through the holes indicated on component placement diagram,
strip and tin the ends, then solder the wire leads to the solder pads. Extend the other ends of the
these wires 2 inches past the mixer end of the pallet. Now attach 3 wires to all off the RCA
connectors so that all wires extend 4 inches past the mixer end of the pallet. Mark all of the wires
with some kind of identity or use a ohm meter to identify them after the pallet is assembled into the
housing.

6. Mount the transverter pallet to the bottom half of the enclosure (half with 7 holes). Install the
4-40 x 3/8” screws, but do not tighten. Then using the panel screws, attach the rear panel to the
housing. Be sure that all of the wires are out from under the pallet and none are being pinched
and after the pallet alignment is checked, tighten all screws. Install the #4 standoffs with lock
washers to the 2 remaining holes in the housing.

7. Complete the final wiring by using the TC installation instructions. Be sure to make all wire
connections to the TC from the bottom side and coax connections on the top side. Review the
Operation instructions of the TC before going on to Step #8.

8. After testing the A32 (if you chose too), attach a 6” piece of coax on the RF OUT of the A32
and a 6” piece of Teflon wire to the 6-12+ input. Now mount the A32 component side down on
the other half of the enclosure with 4-40 x 3/16” screws. (see PCB and enclosure mounting
diagram). Align both housing halves as shown. Then attach the Teflon wire to the +9 connection
on the TC and attach the coax to the LO input of the transverter. Keep all connections as short as
possible and trim if needed. Then If using an external 10 MHz. source, connect a 6” coax from the
10 MHz REF IN to the BNC connector on the rear panel of the transverter. Then, follow the A32
instructions or the TC document for connecting the “LOC” light and the multiple frequency switch if
you desire to install.

/Kits/3456CKA32-RevB.doc 4 Rev. B 8/17/2010

After the assembly is complete, re-check for any lose wires, connections, or missing parts.
Also review your custom configurations if any. For testing, a voltmeter and a 144 MHz. transceiver
is required and a microwave power meter and signal generator are optional.

Again, the further test

Instructions assume a complete 1 watt kit !

Testing Transverter Receive:

Place unit as shown in the PCB and Enclosure Mounting diagram Connect a supply voltage
to the 13.8VDC connector. Toggle the switch on and off to check for LED being lit. If OK, leave
switch in the “ON” position and verify the 9VDC regulator’s operation by checking the voltage or
looking for the “blinking” blue LOC LED or a “Solid Lit” LOC light of the 10 MHz source is either
connected or operating on the A32 board. If you suspect the +9VDC supply line is being pulled
down from the TC, to troubleshoot, isolate which board is the problem by disconnecting the +9VDC
supply wires one at a time. If not, there should be 9 volts at the +9 connection on the TC board
and on the +LO points on the transverter. Then verify voltage on the +RX point of the transverter.
If the 9 volts check, verify the RX and the LO test voltages on the transverter from the chart below.

TEST LOCATION VOLTAGE referenced to Ground

RX 1 Junction of R1 and R2
RX 2 Junction of R4 and U2
RX 3 Input of U2
RX 4 Junction of R6 and U3
RX 5 Input of U3
RX 6 Junction of R7 and U4
RX 7 Input of U4
RX 8 Junction of R9 and U5
RX 9 Input of U5

------------ 1 Watt Option Test 1 Watt Option Test
RX 10 Junction of R22 and C34 Adjust R19 to produce -1.5VDC (negative voltage!)

6.0VDC ± 1V, Not to exceed 7.2VDC!!!!

3.5 VDC ± 1V

2.5 VDC ± .5 V

3.5 VDC ± 1 V

2.5 VDC ± .5 V

3.5 VDC ± 1 V

2.5 VDC ± .5 V

3.5 VDC ± 1V

2.5 VDC ± .5 V

NOTE: If R22 and C34 voltage cannot be obtained, do not proceed with the TX Testing!!

Troubleshooting Receive:

If any of the above voltages are out of specification, check all supply voltages and bias
resistors for correct value. Open circuits are the most common problems. Also check MMIC’s for
shorts to ground (input or output leads). MMICs have a operating current. This results in a voltage
drop across the bias resistors. If there is no voltage drop, then there is no current drain! If there is
a complete voltage drop, then there is too much current drain! Check the circuitry for problems
and suspect a defective MMIC last. It is very Rare!!!

Testing Transverter Transmit:

After the RX and LO sections of the transverter check out, a 50 ohm load of some sort
should be connected to the TXRF connector. If you are testing a 1 watt unit, be sure of the power
dissipation of the load. Place the transverter into transmit by enabling the PTT (either positive
voltage or connect to ground depending on the set-up chosen during assembly). Verify that +9
volts (referenced to ground) is connected to the +TX points on the transverter board and that it
switches off when the PTT control is disabled. Also verify that the +RX disables when the +TX is
enabled and the +LO voltages do not change. If everything checks, verify the Transmit test
voltages on the following chart.

/Kits/3456CKA32-RevB.doc 5 Rev. B 8/17/2010

TEST LOCATION VOLTAGE referenced to Ground

TX 1 Junction of R23 and C29
TX 2 Junction of R23 and C32 0.500 Volts less than TX 1 (adjust R19 to obtain)
TX 3 Junction of R18 and C25
TX 4 Input of U11
TX 5 Junction of R10 and C17
TX 6 Input of U6
TX 7 Junction of R13 and U7
TX 8 Input of U7

9.0VDC ± 0.5V

5.0 VDC ± 0.5V

2.5 VDC ± 0.5V

3.5 VDC ± 0.5V

2.5 VDC ± 0.5V

3.5 VDC ± 1V

2.5 VDC ± 0.5V

Troubleshooting:

Just like in the RX and LO section, If any of the above voltages are out of specification,
check all supply voltages and bias resistors for correct value. Open circuits are the most common
problems. Also check MMIC’s for shorts to ground (input or output leads). Always suspect a
defective MMIC last. It is very Rare!!! If TX2 will not adjust for a voltage drop across R23, be sure
that the negative voltage is adjusting correctly. The closer the negative voltage gets to ZERO, the
more voltage will be dropped across R23. Do not set R19 for Zero Volts!!!

Setup, Interfacing and Operating:

It is now assumed that if you have assembled this kit, you have a reasonable idea of how
you wish to interface this transverter to your 2 meter IF transceiver. If not, here are a few pointers
along with some general guidelines for further enhancements:

1. You will need to “hard-key” this transverter. It is not RF senesced! If you wish to have your
transceiver key the transverter, you will need to use the auxiliary contacts or a positive voltage on
transmit generated by your IF transceiver. Some 144 MHz. transceivers have this built in but some
transceivers don’t. You may need an internal modification in your transceiver to get this.

2. The transverter in its stock form will only safely accept a maximum of 10 watts input if the
TC is used. If you assembled the transverter without the TC, the transverter will not tolerate more
than 20 mW of 144 MHz. directly into the mixer. If your transceiver has more than the tolerable
amount of drive, you will need to devise a attenuator scheme that places the attenuation in line
while in transmit. If this is not possible, do not proceed with testing the transmit section without an
attenuator. If you cannot devise a scheme to remove the attenuation during receive, a receive IF
gain stage may be added to the IF switch to compensate for the additional attenuation in the IF
line.

3. RX and TX levels may change when the enclosure is completely assembled. Please take
this into consideration when adjusting final levels and retest after the assembly is closed if using
any of the complete kit versions.

4. If you intend to remotely mount this transverter, test the transverter with the cabling that will
be used in the instillation before installing.

Testing:

The success of your transverter, if you lack test equipment beyond a Volt meter, depends
on correctly verifying the test voltages and assembling and wiring the transverter’s sub-assemblies
with care. Be sure that there are no “Maybes” and re-check everything before continuing.
After correctly interfacing the transverter to your 144 MHz. transceiver, power the transceiver on
and set the controls to the normal operating receive positions including frequency. Be sure that

/Kits/3456CKA32-RevB.doc 6 Rev. B 8/17/2010

the transceiver is in either CW or SSB. Power the transverter on. The following assumes that you
have assembled the transverter in its stock form and are using the TC. With a 50 ohm load on the
receiver port, (signal generator, dummy load, antenna) some noise should be detected in the
transceiver when the transverter is powered on and off. Adjust the RXIF gain control on the TC to
a level that is just noticeable when the transverter is powered on and off. If a noise level cannot be
detected, recheck all interface connections and transverter voltages in the receive mode. If the
transverter is working correctly, (voltages, RF and IF connections, LO operation) there will be a
noise floor increase unless you have installed a attenuator in the IF line without compensating for it
on receive, or your 144 MHz transceiver is dead! If there isn’t any noise present, please review
your assembly and equipment.
When the receive is working correctly, the transmit section is then tested. Adjust the TXIF pot on
the TC fully counter clock-wise. This is maximum attenuation. If the TC is assembled correctly, a
maximum of 10 watts may be transmitted into the transverter. The transverter will start to saturate
at 1 Watt output. Without a power meter, it isn’t difficult to set the output power, it just that you will
not know exactly what the output power level is. If you have a 1 Watt load on the TXRF connector,
it will get warm when the transverter is transmitting (A clue that there is output!) You can then
adjust the TXIF control buy watching a current meter. Be sure that the transverter is on a separate
power supply from the transceiver for this test or use your volt meter in a current meter function.
Watch the current drain as you increase the TXIF drive level. As the power saturates, the current
will start to drop off (ever so slightly!) Set the TXIF control so the current does not drop off. That’s
It! It is the same for the lower power model, it just has less current drain.

Of course, if you have a power meter, it will make setting the TXIF level and troubleshooting
easier if needed. The low power version should be set around 40-50 mW output power. The 1
Watt level should be maintained. Any higher, the signal will contain extra harmonics that are
produced by the mixer diode being saturated by the 144 MHz. transceiver.
As for the receive, nothing beats a good on the air signal to determine how the receive section is
working. A remote mounted signal source works great if nothing is on the air!

The Finish line!

Carefully, assemble both halves of the enclosure without pinching the wire and coax.
Try to position the IF cable so that is doesn’t lay on the filters of the transverter’s PCB or fix it so
that it is on the ground plane. If the IF cable lays on the transmit, receive, or LO filters, there will
be a slight degradation in performance. The shield of the coax will de-tune the filters if it is in
contact!! It is not serious, but it will degrade!
Screw the remaining 4 panel screws in and re-test the transverter as before to verify everything is
OK! If so, tighten the screws and its ready to go! Please review the General Notes below and
Have fun on the bands!!

General Notes:

1. Spurious response will change depending on the enclosure used. This transverter has been
designed to have a -40dBC of all spurious responses during transmit in our complete kit enclosure.
If your transverter doesn’t not make this specification, something is not assembled or adjusted
correctly. Please verify assembly and verify all test voltages before taking on a re-engineering
project!

2. All transverter circuits are designed to be used with 9 volt regulated source. Anything else
needs different bias resistor values.

/Kits/3456CKA32-RevB.doc 7 Rev. B 8/17/2010

3. The TC IF switch may be used to control a TR switch. At stock levels, sequencing will not be
required to provide basic switching functions.

4. The transverter may be mast mounted if minimal weatherproofing is accomplished. Be sure of
your drive levels and voltage over long runs.

5. The transverter may be interfaced with other external power amps and pre-amps. If you have
any questions please consult Down East Microwave.

6. The transverter is designed and may be used for any mode of operation at a 100% duty cycle.
Switching times will not be as fast as digital modems in its stock form.

7. With the A32 synthesizer, you will be tempted to expand the frequency ability of the transverter.
The only limit are the filters in the transverter. Dual frequency setup is possible for 3456/3400.
Other frequency combinations may attenuate the incoming signals, and the LO filters will not allow
enough drive for the mixers.

Rear Panel Diagram

IF 10MHz

    TX RF     +VTXPTT      TXRF 13.8V  RXRF

PCB

Mounting
Pla te 

The 1 watt output version will have a extra SMA connector installed. The TXRF connector
will be mounted by the RXRF connector so that a common SMA type relay may be connected to
perform the TR function. The connector in the old TXRF position will be a dummy connector and
will not be connected to any circuitry.

Enclosure and PCB Mounting

Lock

+9

RFOut

A32

Sw itch 

 LED

 Lock LED

/Kits/3456CKA32-RevB.doc 8 Rev. B 8/17/2010

+9

TC

PCB

RX

3456PCB



 TX 

Mounted on

Stand ‐Offs

CO AX

 SM A

 RCA

10M Hz

 IF

 SM A

TXRF

RXRF

3456Transverter

PCB

1104MHz.LO

A32

10MHz

M2 M1

+T X

External

orInternal

+LO

RXIF

TX IF

2MIF

TC

+RX

10WMax.

+9VDC

+13.8VDC

Wiring Block diagram

3456 Transverter Parts List

All components are Surface Mount components unless otherwise noted.

C1 8.2 ρF ATC C12 0.1 μF C25 0.1 μF R9 10 Ω
C2 0.1 μF C13 0.1 μF C26 10 ρF R10 10 Ω
C3 10 ρF C14 10 ρF C31A 10 ρF R11 130 Ω
C4 0.1μF C15 0.1 μF R1 10 Ω R13 130 Ω
C5 0.1 μF C16 100 ρF R2 51 Ω R18 130 Ω
C6 100 ρF C17 0.1 μF R3 150 Ω R20 130 Ω
C7 10 ρF C18 10 ρF R4 130 Ω
C8 0.1 μF C19 0.1 μF R5 51 Ω
C9 10 ρF C20 0.1 μF R6 130 Ω
C10 0.1 μF C21 0.1 μF R7 130 Ω
C11 10 ρF C22 100 ρF R8 150 Ω

U1 MGA86576
U2 ERA-1
U3 ERA-1
U4 ERA-1
U5 ERA-2

U6 ERA-1
U7 ERA-1
U11 ERA-4
CR1 MA4E2054
CR2 MA4E2054

Optional ERA-1
“ 200 Ω
“ 130 Ω

3456-144 Complete Kit Hardware Parts List

1- Machined Enclosure 3- RCA connector 3 - 4-40 x 1/4” screws 3- 1000 pF capacitor
2- Machined End Plates 1 - SPDT Switch SMD 2 - 4-40 nuts 3’ #24 Teflon
8- Flat head screws 2- 4-40 x 1/4” standoff 2 - # 4 lock washers 4’ #28 Teflon
2- BNC connector 5 - 4-40 x 3/8”screws 2 - #4 ground lug 30”- RG-188 coax
1- 3/8” hole plug 4 - 4-40 x 3/16” screws 6- 3-48 x 3/16” screws 1 - ¼” thick pallet
3- SMA connector 12- 4-40 x 1/8” 6- 3-48 x 3/8” screws

/Kits/3456CKA32-RevB.doc 9 Rev. B 8/17/2010

3456-144 PA SECTION

C27 0.1 μF
C28 10.0 μF
C29 0.1 μF C34 0.1 μF R22 51 Ω
C30 10 pF
C31B 10 pF

C32 10 pF R19 10K pot Q1 FLL 177
C33 10 pF

R21 51 Ω

C35 10.0 μF R23 1Ω, 1Watt
C36 10.0 μF

IC1 7660

Solder coax center conductor
to connector pin

connector Solder lug

2- sets of 2-56 screw & nut

so ld e r c oax s h ie ld
to fo rmed lu g

PCB MOUNTNG AREA

RG/188 coax from P W B "ANT"

Installation of IF Coax on BNC panel connector

Leads flat to trace, 4 places

Solder full length of lead, 4 places

PCB Trace
Ground Plane

ERA

ERA MMIC ERA MMIC mounted in hole of PCB

/Kits/3456CKA32-RevB.doc 10 Rev. B 8/17/2010

PA Section

+9

+

C28

CR-2

TX IF

C22

3

R19

U1

5

U7

C36

+

4

8

2

+

C35

R22

C34

U6

C33

C31B

U11

Q1

C32

C30

C31A

TX HIGH

R23

R21

C27

VTX

C29

TX LOW

RX IF

CR-1

C6

C21

R13

C20

+VTX

U2

R4

R3

R10

C17

R2

C18

U1A

C25

R1

R11

U1

R20

R18

C19

C1

+VTX

C26

RX

C5

C4

C3

C2

+VRX

R5

C7

U3

C9

U4

R9

U5

C16

LO IN

C8

R6

C13

C12

R7

C11

C10

R8

C15

+9

C14

3456-144 TRANSVERTER SCHEMATIC

/Kits/3456CKA32-RevB.doc 11 Rev. B 8/17/2010

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