150GTL ALIGNMENT REVISION: 1.0 BURKE
ALIGNMENT PROCEDURE
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MODEL: 150GTL
REVISION: 1.1
DATE: 02/14/06
PREPARED BY: BURKE
Total Pages: 6 pages
Page:1 print date: 2/14/06
150GTL ALIGNMENT REVISION: 1.0 BURKE
150GTL ALIGNMENT INSTRUCTION
1 TEST CONDITION:
1.0. TEST TEMPERTAURE: 77 ±9 °F
1.1. STANDARD DC POWER: 13.8VDC
1.2. STANDARD AUDIO LOADING: 8 Ω
1.3. ANTENNA IMPEDANCE: 50 Ω
1.4. STANDARD REF. MODULATION: AM 30%
FM 2.5KHz
1.5. PULSE GENERATOR: 1µS pulse @ 100mS and 1V peak-to-peak amplitude,
with rise and fall time of less than 10nS.
1.6. TEST EQUIPMENT SETUP AS BELOW:
A. TX test equipment setup:
Power
Supply
Modulation
Meter
RF
Wattmeter
Dummy
Load
150 GTL
Generator
Audio
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150GTL ALIGNMENT REVISION: 1.0 BURKE
RF Signal
B. RX test equipment setup:
AC
VTVM
Generator
Oscilloscope
150GTL
Power
Supply
8 ohm Load
Noise Pulse
Generator
2.0
MAIN ALIGNMENT
2.1 PLL Alignment
STEP PRESET TO CONNECTIONS ADJUST PROCEDURE
RX mode, AM,
1
28.000MHz
2 Change to Band D Oscilloscope to TP1
Oscilloscope to TP1 T712
DC level should be < 6V
Check for range of 0.2 to
7VDC, then set to 2.8V
3 Same as step 1 Oscilloscope to TP2 T713 Adjust for maximum output
4 Same as step 1
5 Same as step 1
2.2 Carrier Alignment
STEP PRESET TO CONNECTIONS ADJUST PROCEDURE
TX mode, AM,
1
28.000MHz
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Oscilloscope to 4th test
point of CON2
Frequency counter to
TP3
Frequency counter to
TP3
T717 Adjust for maximum output
CT1
CT2 Adjust for 28.000MHz
Adjust for 17.305MHz
(frequency – 10.695)
150GTL ALIGNMENT REVISION: 1.0 BURKE
T703, T704,
T705, T706,
T707, T708,
modulation, RF output 1500µV
3.0 RECEIVER ALIGNMENT
Connect an AC VTVM with 8 ohm load across speaker coil.
Adjust volume control to obtain a suitable indication.
Set generator output low enough to prevent AGC limiting.
Preset controls as follows, unless otherwise noted:
RF Gain maximum, Squelch minimum, NB/ANL off.
STEP PRESET TO CONNECTIONS ADJUST PROCEDURE
Output of signal generator to
RX mode, AM
1
28.000MHz
Same as step 1,
2
squelch to
maximum
antenna connector.
Freq. = 28.000MHz, 1KHz 30%
modulation, RF output 1µV
Output of signal generator to
antenna connector.
Freq. = 28.000MHz, 1KHz 30%
T710
RV2
Adjust for maximum signal on
VTVM
SQUELCH RANGE
Adjust just until squelch opens
3 Same as step 1
Output of signal generator to
antenna connector.
Freq. = 28.000MHz, NO
modulation, RF output 100µV
RV15
SIGNAL METER
Adjust for a reading of S-9 on the
analog meter of the radio
Output of signal generator and
RX mode, AM,
28.000MHz,
4
NB/ANL switch
set to NB/ANL
noise pulse generator to antenna
connector.
Freq. = 28.000MHz, 1KHz 30%
modulation, RF output 1µV.
T701
NOISE BLANKER
Adjust for maximum amplitude
on oscilloscope
Oscilloscope to collector of Q6
Output of signal generator to
RX mode, FM,
5
28.000MHz
antenna connector.
Freq. = 28.000MHz, 2.5KHz
T702
Adjust for maximum signal on
VTVM
deviation, RF output 1µV
4.0 TRANSMITTER ALIGNMENT
Maintain a 50 ohm 25 watt dummy load on the antenna connector for the following steps.
Preset controls as follows, unless otherwise noted:
RF Power set to HI, Mic Gain to minimum.
STEP PRESET TO CONNECTIONS ADJUST PROCEDURE
T718, T719,
T720, T721,
T722, T723
Adjust for maximum RF output
RF POWER - HI
Adjust for 13-17 watts on all
bands
RF POWER - LO
Adjust for 4 watts
1
TX mode, AM,
29.700MHz
RF wattmeter to antenna
connector
2 Same as step 1 Same as step 1 L21
3
Same as step 1,
Power switch to LO
Same as step 1 RV9
Page:4 print date: 2/14/06
150GTL ALIGNMENT REVISION: 1.0 BURKE
STEP PRESET TO CONNECTIONS ADJUST PROCEDURE
RF POWER METER
Adjust for a reading of S-9 on the
analog meter of the radio
AMC CONTROL - HI
Adjust for 90% modulation on
all bands
AMC CONTROL - LO
Adjust for 90% modulation on
all bands
4
5
6
TX mode, AM,
29.700MHz
TX mode, AM,
29.700MHz
Mic Gain to
maximum
Same as step 5,
Power switch to LO
RV1
Modulation meter to
antenna connector.
Insert a 1KHz, 30mV
RV12
signal to microphone
input.
Same as step 5 RV4
TX mode, FM,
7
29.700MHz
Mic Gain to
Same as step 5 RV5
DEVIATION LIMITER
Adjust for 2.5KHz deviation
maximum
SWR METER
8
TX mode, AM,
Power switch to LO,
Mic Gain to
minimum, S/RF
switch set to CAL
Connect a 100 ohm
non-inductive dummy
load to the antenna
connector
RV17
Adjust SWR Cal knob so analog
meter on radio goes to CAL
mark. Then set S/RF switch to
SWR and adjust RV17 for an
SWR reading of 2 on the analog
meter of the radio.
9
TX mode, AM,
Power switch to LO,
Mic Gain to
minimum
Short the antenna output
to ground
RV3 (located
on back of
front panel)
ANTENNA LIGHT
Adjust RV3 just until the
antenna light comes on
Page:5 print date: 2/14/06
150GTL ALIGNMENT REVISION: 1.0 BURKE
Page:6 print date: 2/14/06
150GTL ALIGNMENT REVISION: 1.0 BURKE
REVISION HISTORY
1.0 – Initial release
1.1 – Added section Step 9 in Section 4
Page:7 print date: 2/14/06
150GTL Channel Display
The 150GTL has 4 bands which cover frequencies from 28.000 to 29.700 MHz in 5KHz steps.
The dual seven-segment channel display indicates the operating frequency.
BAND FREQUENCY RANGE CHANNEL DISPLAY RANGE
A 28.000 to 28.495 00 to 49.
B 28.500 to 28.995 50 to 99.
C 29.000 to 29.495 0.0 to 4.9.
D 29.500 to 29.700 5.0 to 7.0
You must be careful to note the decimal points!
This decimal point
shows the MHz band.
OFF = 28.xxx MHz
ON = 29.xxx MHz
These two digits are
determined by the status
of the decimal between
the channel numbers.
Decimal OFF = 28
Decimal ON = 29
This decimal point
shows the last digit.
OFF = xx.xx0 MHz
ON = xx.xx5 MHz
x x . x x x MHz
These two digits are
taken directly from the
channel display.
The last digit is determined
by the status of the far-right
decimal point.
Decimal OFF = 0
Decimal ON = 5
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