Toby, I can’t speak to issues 1 and 2 but I have one of the more recent units which includes the enhanced 200 MHz master oscillator stability circuit. I don’t have my Z3801A GPS controlled frequency source available right now so I used the K6JCA console and WWV to do some limited experiments to check transmit oscillator drift.
The rig had been on for several hours. I tuned in WWV on 15 MHz and zoomed the spectrum mode. I set the SDR-1000 clock offset to show WWV centered at exactly 15.000000 MHz. I transmitted into a dummy load at 25 watts (max continuous carrier) in tune mode for various times up to 5 minutes then switched back to WWV to measure the oscillator drift. I repeated this test several times. Results ranged from 4 to a maximum of 8 Hz. I also used my FT-1000MP’s (with high stability osc option) CW tuning indicator to check drift during transmission. The tuning indicator will change if the deviation is more than about 10 Hz. No deviation was ever shown. From these experiments I believe that the transmit frequency drift issue has been resolved. While many (including me) are a little nuts about frequency stability and want to tie everything to a GPS controlled standard, the SDR-1000 is now as least as good as most modern transceivers. Mark N6SF _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
