Vectronics VEC-1002K - Manual (Page 24)

VEC-1002K Owner's Manual 2 Meter FM Receiver Kit
22
If coils L1 and L2 were formed and installed according to instructions, your
radio should operate with near-maximum sensitivity and require no further
adjustment. However, if you wish, you may "tweak" these two coils to optimize
performance on weak distant stations. In order to make this adjustment, you'll
need a weak signal source. This could be a 1 uV 146.0 MHz signal produced by
a signal generator, or a weak off-air signal with audible background noise
present. To adjust, use the blade of a non-metallic tuning wand or your
fingernail to expand or compress the spacing between turns. Note that adjusting
L1 and L2 may change the radio's operating frequency slightly. To compensate
for this interaction, readjust TUNE as you make each change to ensure the signal
remains tuned in.
Reduced background hiss and lower distortion indicates an improvement in
signal strength. As you find the best point for each coil, stretch or compress it
permanently into that position. Don't attempt to adjust L1 and L2 while tuned
to a strong local signal. Use only a weak signal with clearly-audible
background hiss. Note that L3 is non-critical, and requires no adjustment.
When peaked, the VEC-1002K should render "solid copy" on FM signals of 1-
uV or less.
OPERATING INSTRUCTIONS
Power
Tune
Squelch Volume
145
146
147
VEC-1002K
1
2 3 4
1. POWER: Push-on/push-off switch turns unit on and off. The VEC-1002K
runs on internal battery power and shouldn't be left ON for extended period
when not in use.
2. TUNE: Electrically tunes receiver oscillator, setting frequency where signals
are received. Tuning range may vary slightly from unit to unit, but should be
approximately 145.1 to 147.6 MHz (the frequencies where most repeater and
"simplex" FM activity take place).
3. SQUELCH: Adjusts threshold-point for cutting off receiver background
noise.
4. VOLUME: Adjust audio amplifier gain to a comfortable listening level.
Antennas: