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LBI-38861C
Figure 7 - Location Alignment Test And Adjustments
12
RECEIVER ALIGNMENT
RF TUNING
1.
Connect to the radio an RF signal generator to the ANT
socket through an adaptor and a SINAD meter to the
accessories socket as shown in Figure 4.
2.
On the TX/RX printed circuit board adjust VR201 fully
counter clockwise position.
3.
Adjust the VOLume control to the mid position.
4.
Using the channel switch select the center frequency
channel.
5.
Set the RF signal generator to the receive channel
frequency and set to 60% deviation.
6.
Set the audio frequency to 1 kHz.
7.
Adjust the RF output voltage level of the RF signal
generator until the 1 kHz signal is audible. Note the RF
output voltage level and the SINAD reading.
8.
Adjust FL3 to for an improvement in SINAD.
9.
Adjust the RF output voltage level of the RF signal
generator while keeping the SINAD meter readings
between 12 and 20 dB.
10. Adjust FL2 for an improvement in SINAD.
11. Adjust the RF output voltage level of the RF signal
generator while keeping the SINAD meter readings
between 12 and 20 dB.
12. Adjust FL1 and check for an RF voltage signal level of
0.5 µVpd and a SINAD meter reading of between 12
and 20 dB.
13. If the readings in step 11 are not as stated, adjust the RF
output voltage level of the RF signal generator to a
achieve SINAD meter reading between 12 and 20 dB.
14. Adjust T4 and check for an RF voltage signal level of
0.25 µVpd and a SINAD meter reading between 12 and
20 dB. Check the upper and lower sensitivities.
15. If the readings in step 14 are not as stated, adjust the RF
output voltage level of the RF signal generator to
achieve a SINAD meter reading between 12 and 20 dB.
16. If the SINAD meter reading is below 12 dB, repeat steps
7 to 16. Otherwise, reset VR201 to the required operat-
ing position.
DISCRIMINATOR TUNING
1.
Set the RF level to 10 mVpd.
2.
Adjust T5 for maximum audio output and observe the
oscilloscope for sinewave distortion.
3.
Adjust T4 for minimum distortion, normally less than
3%.
4.
Disconnect the test equipment.
SQUELCH ADJUSTMENT
1.
Set the RF signal generator to the receiver frequency
with 60% deviation. Set audio signal to 1 kHz.
2.
Adjust the RF output level of the RF signal generator
until the 1 kHz signal is audible.
3.
Adjust the RF signal to the level desired for squelch
sensitivity. Monitor SINAD, usually 12 dB.
4.
On the TX/RX board, adjust VR201 until the squelch
is just unmuted (open).
5.
Turn the RF generator off.
6.
Press and release the monitor button and check that the
audio output may be muted/unmuted.
7.
Disconnect the test equipment.
PROGRAMMING THE RADIO
Refer to programming manual TQ3375 when programming
the radio. Programming cable TQ3376 is required to intercon-
nect the radio and PC programmer.
SERVICING THE BATTERY
BATTERY CHARGING AND CARE
To insure peak performance from your radio, the battery
pack must be fully charged. Proper care and charging will allow
maximum performance and life of your battery pack.
New batteries or batteries that have been stored for a long
period of time, should be fully charged before placing into
service. The battery should be replaced if the charge state is in
doubt.
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