Transmit power output after modification
Power output in watts as measured from an uncalibrated Diawa CN-620 wattmeter with vhf,uhf dummy load. Power output on
radio set to highest level.
FREQ FM PWR AM CARR FREQ FM PWR
105 MHz 1.0 0.0 400 MHz 2.0
110 1.0 0.0 405 7.0
115 2.0 0.0 410 9.0
118 3.5 0.7 415 10.0
120 5.0 1.0 420 12.0
125 14.0 3.5 425 15.0
130 20.0 15.0 430 18.0
135 25.0 17.0 435 20.0
140 28.0 18.0 440 20.0
145 32.0 18.0 445 19.0
150 32.0 18.0 450 18.0
155 20.0 18.0 455 15.0
160 13.0 10.0 460 8.0
165 6.0 1.5 465 0.8
170 1.5 0.0 467 0.15
175 0.5 470 0.00
180 0.1
185 0.0
These are the readings I took after performing the mod. I took readings at key frequencies throughout the band to measure the
efficiencies of the different band pass filters, especially in the HF band. The attenuation at the edges of the filters are very visible
especially at the 8MHz cross point.
All readings were took with a bird wattmeter and a home made RF voltmeter, the latter is not reliable over 200MHz.
Thanks. Olivier, VE2NSM.
MHz V @ 50 Ohms
W from Bird
Wattmeter
W from RF Voltmeter
0.1 0,00 - 0,00
0.2 0,04 - 0,00
0.3 0,31 - 0,00
0.5 1,95 - 0,01
0.65 4,16 - 0,11
0.75 8,60 1,5 0,59
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