TECHNICAL SUPPLEMENT FOR THE SR-160 & SR-500 by WDØGOF August 2010
24
SR-500
TRANSMITTER PERFORMANCE
Tests performed with 50ohm resistive load. Measurements made with BIRD avg power and PEP power meter.
Bench power __ VAC
Final amplifier bias
set to 100 ma SSB mode zero drive. _____
Neutralization
performed @ 14.150 MHZ. _____
Carrier balance
null _____ db below full power output level.
Microphone input sensitivity
at 1000HZ. A signal level not more than 8 mv rms shall produce the minimum
specified SSB output at specified freq. Mic gain set just below flat-topping and should occur between 60% and 80%
of rotation.
Flat-topping occurred at
__
% of mic gain rotation with 8 mv audio input.
CW power output
with RF level set just to saturation level.
FREQ
MIN SPEC AVG POWER
3.9mhz
190 W min
7.23mhz
220 W min
14.28mhz
200 W min
SSB PEP power output
mic gain set just at saturation.
SSB TX AUDIO RESPONSE
.
From 600 Hz thru 2700 Hz there will be no more than 3 db change in output power.
Tune transmitter at 3.900 MHz. Do not exceed the duty cycle of the TX.
Mic audio input set for 8 millivolts at 1000Hz, LSB, Set mic gain for 100 watts output.
Set audio freq to 600Hz, 8 mv. Tx PEP not less than 50 or greater than 65 watts __________watts
Set audio freq to 2700Hz 8 mv. Tx PEP not less than 50 or greater than 65 watts __________watts
Manually sweep audio osc from 600 HZ to 2700 HZ if multiple peaks occur within the pass band there will be no
more than 2db from the peak to valley between. _______ Db
FREQ
MIN SPEC
PEP
3.9mhz
190 W min
7.23mhz
220 W min
14.28mhz
200 W min
