Tom, Yes I have done tests with the SDR antenna terminated in a dummy load and the panadapter shows a significant increase in the noise floor near the receive frequency (as well as some other places). The overall background noise increases when connected to an antenna about the same as on the FT-1000MP but it is the inherent noise near the receive frequency that reduces the signal-to-noise ratio of received signals on the SDR as compared to the FT-1000MP. The terminated noise as shown on the panadapter is independent of band, frequency, mode, filter settings, etc.
I've setup a single point ground, checked the power supply and tried to eliminate environmental causes as best I can. Of course there are many environmental possibilities but with the limited test equipment I have here checking the SDR hardware itself seemed like the next logical step. Thanks for the suggestions. I'll keep working on it. Mark N6SF ----- Original Message ---- From: Tom Thompson <[EMAIL PROTECTED]> To: Mark Gang <[EMAIL PROTECTED]> Cc: flexradio@flex-radio.biz Sent: Wednesday, February 14, 2007 5:14:36 PM Subject: Re: [Flexradio] Need Help Testing an SDR-1000 Carlsbad, CA Mark, You may have already tried this, but if you haven't, connect your SDR to a dummy load and then to the antenna and determine what the increase in noise is. Do the same for the FT-1000MP and see if the relative increase is the same. Also, if you have an antenna tuner, preferably a High Pass T, try tuning up on a higher band and see if that reduces the noise. It might be an intermod problem with some strong AM broadcast. I hope this is helpful. 73 Tom W0IVJ Mark Gang wrote: >I have been using an SDR1000 for about a year. I recently moved to Carlsbad, >CA and am temporally living in an apartment. I set up a simple dipole but the >SDR-1000 is seeing a much higher noise level than my other radio, an >FT-1000MP. I have tried all the usual fixes and talked with he folks at >Flex-Radio. Before I continuing I would like to eliminate the SDR-1000 >hardware as the source of the problem. > >If there are any SDR-1000 users in the Carlsbad (or San Diego) area I would >like to do a simple substitution of my SDR-1000 for theirs in working setup to >see if the results are the same. I would be happy to bring my unit over to >their shack for a test. > >Please contact me by email at mark6sf(at)yahoo.com or cell 415.336.8024. > >Thanks, >Mark N6SF > > > > > > >_______________________________________________ >FlexRadio mailing list >FlexRadio@flex-radio.biz >http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >FlexRadio Homepage: http://www.flex-radio.com/ > >FlexRadio Knowledge Base: http://kb.flex-radio.com/ > > > > > _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/
