On 5/24/2010 4:32 PM, Jim Brown wrote: > On Mon, 24 May 2010 13:05:03 -0400, Paul Christensen wrote:
>> Another disturbing attribute of the '7800 and '7700 is that harmonics from >> its internal SMPS can be heard when the receiver is tuned from ~ 80 kHz >> through 160m with decreasing amplitude as the receiver is tuned upwards. >> Oddly, the noise increases as the antenna ports are deselected. > > Yet another great feature of a $10K radio. :) I had an IC-751 that did this. In those days I was naive about switching supplies, and I could not figure out what the noise was. At one point I had to send it to ICOM for service for another problem, and I asked them to please fix the noise. They replaced a number of parts (not connected with the PS) and reported it fixed. Of course there was no difference. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
