NC0B: > Comments on testing radios. > > One can test radios with really clean OCXOs, but that does not give > much flexibility.
W6RMK: >Unless you're independently wealthy and can afford a whole batch of oscillators<grin> When that person steps forward, the following would be an interesting receiver test (simulates a contest like the CQ 160 CW): Space S9+30 carriers every 500 Hz and measure the change in noise floor while cycling them on and off. Next step would be to key the signals on and off (unsynchronized). An equivalent test for SSB would use spacing every 2 kHz, but adding modulation to simulate an SSB signal. The tests we have (IMD, BDR, Phase Noise...all using very pure continuous sources) are woefully inadequate to simulate the real world of transmitted phase noise, key clicks, SSB IMD splatter, etc. Rather than just 2 pure tones for IMD tests, it would be interesting to see the combined effect of many. Seems like you would get an additive effect from phase noise over a very wide bandwidth. 73, Bill W4ZV _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
