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INITIAL TESTING
To begin initial testing we will need a few items to make the job a little easier on
ourselves. Gather these things together and we will begin.
"Diddle Stick" plastic alignment tool (for coils)
12VDC Power supply or battery
Appropriate jacks and connections for hookup
A signal generator (not required)
Frequency counter
Voltmeter
1. Connect 12VDC power to your WSR-1 through J4 making sure that the
center lug is positive. The power supply should be regulated or a battery,
and rated to deliver at least 250mA.
2. Turn the unit on and verify power up. This is done by observing the LEDs
on the front and observing that only one is lit.
3. Turn the squelch (R11) all the way counterclockwise to guarantee that
the squelch is open.
4. Make sure that the SCAN/MANUAL switch is out, so the unit is in manual
mode.
5. Depress S2 until channel 1 (D5 is illuminated) is selected.
6. Attach your voltmeter between TP4 and ground. Set your meter so you
can monitor the voltage while you adjust L8. Vary L8 slowly until you see
the voltage "lock" (stays around .4 volts for channel 1). Vary the coil around
to get a feel for where this actually occurs. When the voltage is "locked", it
means the PLL is calibrated and operating properly.
7. If you have a good RF signal generator, perform these next steps,
otherwise skip to step 9.
8. Make sure your WSR-1 is set on channel 1, then generate an FM
modulated signal at 136.770MHz. If your signal generator can't go that
high, you can use a harmonic of the generator. For example divide
136.770MHz by any integer, and that is a frequency you can use to
generate the signal. You can then perform step 10, adjusting for greatest
sensitivity. If you can, FM modulate your signal at 2400Hz, and a deviation
around 2Khz. This makes life a little easier since you can adjust for the
most quality sound as well. Skip to step 10.
WSR-1A• 23
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