MFJ
BOX APPEARANCE
1.
Check appearance of box in the following areas: a.
Missing or partly missing letters and numbers. b.
Scratches.
c. Deformed bends
d. Missing pin nuts
e.
Bad paint
f . Uneven cuts
g. SWR and Resistance indicators for correctness and scratc hes.
h. UTC 150 Counter Mo dule fo r scr a tches.
1. Check the following for tightness.
a. Seven (7) screws on the box face.
b. Six (6) screws on back
c. Four (4 ) scre ws o n back o f UTC 15 0 Co unte r Mo dule, (un der main c irc uit bo ar d)
d. Antenna S0239 bolts and nuts (2), and nuts on the two (2) "Input" & "Gate" push button
switches.
e. Knobs (Check for alignment, proper height, and tightness).
indicators bracket screws.
Check circuit board for the following:
a. Excess flux.
b. Bridge d so lder join ts.
c. Cold so lder join ts.
d. Loose wiring.
e. Ball t y pe s o ld er joints.
f . Unsolde re d jo ints .
2. Inspect Antenna jack and push button switches solder connectio ns.
of impressions
of
circuit bo ard.
Circuit Board inspection 1.
Tightn ess C hec k
f . SWR
& Resistance
Adjusting Counter Module.
1. Make sure unit is Off an d ins ert po wer plug int o powe r
jack. (Power = 12 vdc, Plug center is positive)
2. Set Frequency switch to 113 --170 range and tuner to maximum
clockwise position.
3. Turn unit on . D isp la y s ho u ld s how some frequenc y. Usually ar o u nd 17 0
to 174 MHz. Tough a hole in the back of the board adjust R32 until
display reads it h ighes t freq uenc y, (w ill v ary acco r ding to how L6 is
set).
4. Hook up an external frequency counter to the antenna jack.
5. Check to see if t he mod ule fre que nc y ma tc hes t he ex ter na l fre q ue ncy
counter fre que ncy . Mod ule fre que ncy s ho uld be stab le to w ithin .00 digits .
Setting the A.G.C. voltage.
pp
1.
Range switch should be in the 113 – 17 range.
2.
Tune disp lay to r ead 1 65 - 166 MH z.
3.
On back side of bo ard me asur e t he vo ltage o n p in 2 of ICI . It s ho uld be 300 - 4 00 mV.
Check voltage on p in 3 o f ICI and ad ju st R18 t ill vo lta ge matc hes pin 2 or is w ithin . 003 mV of it Volta ge o n
4
pin 3 shouldn' t drop belo w that of p in 2 because unit may bec ome unst able.
Setting Ranges
1. Set range 113 -170 b y adjusting L6. Yo u must spread or c lose L6 to o btain frequency. I deal
range would be: 112 -174 MHz.
2. Set range 62. 5 -1 13 by adjus tin g L5. Yo u mus t sprea d or c lose t he co ils on L 5 to obta in
frequency . I dea l fre que nc y wou ld be : 61 .8 - 114. 8 MH z.
3. Set range 26.2 - 62.5 by ad justin g L4. You must use a alignmen t tool for th is induc tor. Ideal
range would be: 25.5 - 63.25 MHz
4. Set range 10 - 26. 2 by adjust ing L3. Yo u mus t us e a a lign men t too l for th is in duc tor. I deal
range would be: 9. 97 - 27.0 0 MHz.
5. Set range 4 -10 by ad justin g L2. You m ust use a align ment to ol for
this induc tor. I dea l ran ge wo uld be : 3. 97 -10. 12 MHz
6. Set range 1.8 -4 by adjus ting L 1. You must use a a lignmen t tool for th is indu ctor.
Ideal range wou ld be: 1.76 - 4. 12 MH z
7. Recheck both top a nd botto m of all ra nges.
Note: When the back is put on the box all to p range s will dro p in freque ncy and also ba ttery lead placeme nt will
change fre que ncies due t o adde d ind ucta nce of the met al a nd w ire. If a ny do ubt, mark box wit h a st ick er and
have unit returned to you for inspection when back is put on. Each unit has a different spread in ranges. The
top of the ranges has the biggest drop when the back cover is put on.
SWR & Resis ta nce me ter s a djus tme nt
1. Set range switch to 1.8 - 4.00 MHz range. Plug a 100 ohm dummy load
into the antenna jack.
2. Adjust R17 for a "2" reading on the SWR meter. Exact reading should
be -. obta ined. Mete r s hou ld be s tab le.
3. Replace the 100 ohm dummy load with a 50 ohm dummy load.
4. Adjust R 31 till res is tanc e meter rea ds 50 o hms. Exact r ead ing s hou ld be
obtained. Me ter.s hould be s table .
5. Replace 50 ohm dummy load with the 100 ohm dummy load again and check
to see if resistance meter reads close to 100 ohms.
Note: The u
scale. Getting the 50 ohm reading when the 50 ohm load is in place is more important.
er scale of the resistance meter is less accurate then the lower end
of the
Checking "Input & Gates "
1. Check Input to unit by inputting a signal from another 2491259 Analyzer into the
Frequency Input BNC. Press input button till a "B" appears
in the upper right corner of the display module. This is the input mode and the display
should display the input frequency from the external frequency generator. Leave in the
mode for abo u t 15 se co nds to be s ure it does n' t fa de o ut or d is appe ar.
Warning: The frequency counter has a CMOS input device that can be easily dam aged. To
avoid dam age , obse rv e the fo llow ing :
Never exceed 5 vo lt s pe ak inp ut vo lt a ge.
Never input a signal with unit off.
2. Test "Gate " but to n to be s ure t hey c hange in or de r. The f ollo w ing s hould be dis pla yed as
button is de pr esse d; 0. 0 1, 0.1, 1.0 , 10. In th at or der. Make s ure they do n' t s kip or der .
Battery Leads Test
1. Place a short acro ss o ne of ba ttery co nnec tors.
2. Touch y our powe r p lug to the othe r b atter y co nne cto r by pla cin g the t ip of yo ur po wer plu g to
the large female socket and resting the outside contact of your power plug against the small
male con nec to r. U n it should come on.
3. Check other battery connector in the same manner.
Final Step
1. Turn unit po wer s wit ch off be for e sen ding to ba ck ins ta llat ion step.
Note: Wh iie no t re a l im p or ta nt , it 's goo d to leave the range switch and tuner in t he s ame position on each
unit. I place the range switch in the 113 - 170 position and the tuner fully clockwise, and power switch
off.
OPTOELECTRO\TICS, INC. UTC151
g
OPERATOR'S MANUAL
Version 1.0
July 21, 1995
INTRODUCTION
This document describes the oper ation of the Optoelectronic s, Inc. Model UTC151 Frequen cy
Counter Module : The UTC1 51 count s freque ncies up to 175 M Hz, and pr ovides t wo in puts and
four gate times.
EXTERNAL CONNECTIONS
All connections to the UTC151 Frequency Counter Module are made through a 14-pin male
doublerow header, located on
summarized in Table 1 below. Following the table is a description of each of the signals.
PIN SIGNAL TYPE
1GND Power
2GND -Power
3OSC-EN* Ou •gut
-
4'
'OE30-PVIRDWN* Output
5INPUT* Input
6GATE* Input
7GATE-SELO* Input
8GATE-SELI* Input
9N.C. NIA
10 INPUT-B Input
11 INPUT-A Input .
12 GND Power
13 +5VDC Power
14 GND Power
GND
,
the rear panel. The signals available on the connector are
These four connector pins provide the ground reference for the power supply, as well as all input
and output signals.
OSC-EN*
This TTL output signal allows the UTC151 to control an external oscillator. When input A is
selected, the UTC151 enables the external oscillator by asserting this signal (TTL low). When
input B is selected, or when the UT C151 is in SLEEP mode, the UTC151 disa bles the external
oscillator by negating this signal (TTL high). The electrical specifications for this signal are as
follows:
TTL low: 0.4 V max., 1.6 mA max. sink current
TTL hi
h: 3.8 V min., 0.4 mA max. source
GATESELO*
p
g
pp
GATESELI*
These
input signals select the power-up default gate setting of the counter. These signals
TTL
are read once at power-up, and are ignored at all-other times. A weak pull-up is provided
internally. Therefore, leaving the signals open is interpreted as a TTL high, and grounding the
signals is interpreted as a TTL low. The four power-up-default gate settings supported are
summarized in Table 3 bel ow. These signals can also be driven by TTL logic. The el ect r i cal
low: O.S V max., 250 itA max. load
TTL
current TTL high: 3.9 V min., 2 l.tA max.
Table 3. UTC151 Power-u
Default Gate Settings.
GATE SETTING GATESELO* GATESEL1*
1 TTL high TTL high
2TTL-lowTTL high
3TTL highTTL low
4
INPUT-A -- - - -
TTL low TTL low
This input is the direct AC coupled input to the frequency counter. Signals up to 175 MHz can
be counted through this input. The amplitude o f signals pres e n ted to this input should not
exceed 2.5 vo l ts peak-to-peak. - '
INPUT-B
This input is the 5052 AC coupled input to the fre q uenc y.counte r. T his input provides a 5052
up
amplifier stage. When counter input A is selected, the amplifier is disabled. Signals
to 175
MHz can be counted through this input. The amplitude of signals presented to this input should
not exceed 2.5 volts peak-to-peak. -
+5VDC
DC power is supplied to the UTC151
through this connector pin. The
_
supply
voltage range is
4.75-5.2 5 VDC, 100mA max.
FRONT PANEL DISPLAY
The UTC151 front panel display consists of a ten-digitLiquid Crystal Display (LCD) module. The
as
results of all fi-e
m-ncy measurements are displayed here.,
well as various annunciators.
FRONT PANEL INDICATOR
The UTC151 has one Light-Emitting Diode (LED) front panel indicator. This indicator LED
flashes each time a m easur em ent is s ucce ssf ully com plet ed. Th e amo unt of ti me b etwe en f lashe s
of the indicator LE D is equal to the currently sele cted measurement time (see Table 2). At the
shortest measurement time, the indicat or LED %-ill flash so fast that, to the human eye, it will
a
ear to be on continuously.
OE30-PNVRDNN'N* .
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This TTL output signal; when asserted (TTL low), indicates that the OESO counter chip is in power
down mode. This occurs when the UTC151 is in SLEEP mode. When the UTC151 is in normal
operation, this signal is negated (TTL high). The electrical specifications for this signal are as follows:
TTL low: 0.4 V max., 1.6 mA max. sink current
TTL high: 3.S V min., 0.4 mA max. source current
INPUT*
This TTL input signal selects between counter inputs A anc B. This signal is fully debounced, and a weak pullup is provided internally. Therefore, a normally-open, momentary push-button switch can be connected between
this signal and ground. Each time the push-button switch is pressed and released, the. opposite input is selected.
The currently selected input is indicated by 'the corresponding annunciator on the display. This signal can also be
driven by TTL logic. - However, due to the debounce logic, the minimum duration: of any input state is 60
milliseconds. The electrical specifications for this signal are as follows:
TTL low: 0.8 V max., 250 FA max. load current
TTL high: 3.9 V min., 2 VA max. load current
GATE*
This TTL input signal selects the gate time, and hence the measurement resolution, of the counter. This
signal is fully debounced, and a weak pull-up is provided internally_. _Therefore, a normally= open,
momentary push-button switch can be connected between this signal and ground. The UTC151 has four
gate settings. Each time the push-button switch is pressed and released, the next gate setting is selected.
The currently selected_ gate setting is indicated by the position of the 'decimal point on. the
frequency display. The four gate settings supported are summarized in Table 2 below. This signal also
has an alternate function. When the UTC151 is turned on while pressing and holding the GATE pushbutton switch, the five-minute SLEEP mode timeout function is disabled. This signal can also be driven
by TTL logic. However, due to the debounce logic, the minimum duration of any input state is 60
milliseconds. The elect ri cal spe ci fic at ions for this signal are as follows:
TTL low: 0.8 V max., 250 l.tA max. load current
TTL hi
h: 3.9 V min., 2 pa max. load current
Table 2. UTC151 Gate Settin
GATE
SETTING
GATE
TLTVIE
1 10 ms 25 mS 100 Hz 162.5500
2 100 ms 130 ms 10 Hz 162.55000
3 1 S 1 S 1 Hz 162.550000
4 10S 10S 0.1 Hz 162.5500000
s.
MEASUREMENT
TL1IE
MEASUREMENT
RESOLUTION -
EX-4MPLE
(11IHz)
POWER UP
When the UTC151 is turned on by applying DC power to the +5VDC pin, a display self-test is
performed by illuminating all front panel display segments for appro\imately two seconds. "AFJ"
is then displayed for an ndd itionnl tun sec-onds. The I JTC151 then hi-.g ins, normal op eration with
the
currently selected power-up default gate setting, and the five-minute SLEEP mode timeout
function enabled. To disable the fire-minute SLEEP mode time-out function, press and hold the
GATE push-button svdtch before turning on the UTC151. Once the display self-test begins,
release the GATE switch.
SLEEP MODE
The UTC151 has an internal five-minute SLEEP mode timer. Each time the INPUT or GATE pushbutton switch is pressed , the timer is reset to five m inutes . If five mi nute s have el apsed sinc e the
last time either push-button switch was pressed, the UTC151 automatically. enters.SLEEP mode,
and 'SLEEP-----'( is displayed on the front pa nel d isplay. In 'SLEEP' modc,,.thc.OE30 . counter
chip;
the 5052 amplifier, and the ex te rnal o scillator are disabled to conserve batte ry power. Once in
.
SLEEP rnbde, pressing either the
-
normal
operation. -The SLEEP mode timeout function can be disabled as described. above.
-
INPUT or GATE push-button switch causes the UTC151 to resume
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