Hi -- John at flex-radio suggested I may have a ground loop. I couldn't tell, everything goes into one power strip. But it got me thinking about what was really flakey in my system. Grounding. I went to home depot tonight and got 2 copper ground rods and a length of 2ga stranded copper wire. I spaced the ground rods about 10 ft apart and ran the wire right up to the radio. Hum not a problem now. Cost $50 however.
I am still open to the matching idea however. I am getting new antenna materials this week and will continue to experiment. -- Paul -------- Original Message -------- > From: Craig Monsen <[EMAIL PROTECTED]> > Sent: Wednesday, March 29, 2006 6:38 PM > To: [EMAIL PROTECTED], [email protected] > Subject: Re: [Flexradio] Hum in mw broadcast > > I believe that I can report the same type of problem. > > I think that it might have something to do with impedance matching of the > antenna on the lower frequency bands on receive. > I can hear significant "hum" on 160 meters or on MW if the antenna isn't > matched properly. > > Although the receiver isn't deaf on lower frequencies, it seems to pick up a > lot of "hum" without a tuner. > > I have found that use of a tuner/preselector for general coverage reception > is helpful. Maybe this is obvious, but in case it isn't, this has been my > experience. > > 73 > Craig > KC2LFI > ----- Original Message ----- > From: "Paul Shaffer" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Wednesday, March 29, 2006 7:24 PM > Subject: Re: [Flexradio] Hum in mw broadcast > > > > It lowered the level of everything, the hum seemed to still be there. > > > > > I just had breakfast with another SDR owner..... he described the same > > > problem..... he found that when he set the PreAmp to low or off, the low > freq > > > audio hum went away. > > > > > > I'd be curious if that fixes your problem. (Too much gain) > > > > > > > > > > _______________________________________________ > > FlexRadio mailing list > > [email protected] > > 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
