Hello Flexers What you guys are seeing is the carrier that is only being suppressed by about 50dB out of the SDR-1000 modulator. When operating CW and you key up you will see the carrier which is offset by the tone that you select for your personal preference. In my case it is 600 Hz. What this means is that my key down signal is a 600 Hz shifted signal that I hear in a close by receiver. When I key up and am still in the MOX "on" mode my residual is 600 Hz offset and down about -50dBc. When operating SSB, the noise out of the sound card( in my case the Firebox) modulates this -50dBc signal and produces a noise modulated residual carrier that is only -42dBc. This does not bother me too much since my usual fan noise keeps the background up a bit anyway but on CW on the microwave bands, the key up is pretty noticeable. I used to see this same sort of key up condition with my IC-271A but "never" with my FT-847, FT-920 and FT-1000. Check it out on a spectrum analyzer and you will see what I am talking about. I do this with the low power unit, i.e. 1W which does not do 1 watt.
Best 73 Al W5LUA EM13qc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ross Sent: Saturday, February 03, 2007 7:37 PM To: FlexRadio@flex-radio.biz Subject: [Flexradio] SSB question This question may seem strange as I have been using my 100watt SDR1000 for about a year, but mainly on digital modes. While checking aerlier today, I tried SSB and listened to the signal on another rig, without speec and with the mike turned off, what appeared to be hum was audible and the s-meter on the second rig showed what seemed to be a carrier, The DC block made np difference with enabled or not. This was not feedback as I was using a headsset on the second rig and the mike was turned off. This SDR1000, the monitors and the Ediroll are fed from a UPS. Image rejection has been checked and appears ok. Using the SDR1000 to check the SSB transmission from the second rig, it was perfect, no audible background noise at all. Ideas please, as I would not like this possible problem to be affecting my digital transmissions. Regards to all Ross ZL1WN -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachment s/20070204/80df75ae/attachment.html _______________________________________________ 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/
