On 5/9/2011 6:32 AM, Steve Kavanagh wrote: > Stu > > A couple of thoughts..... > > You didn't mention if the oscillation was occurring with the amp driving an > antenna or a dummy load. The Elecraft transverters have lots of nice > features but they are quite poorly shielded. If you were using an antenna > you might be getting an RF feedback loop via the various rear-panel > connectors which rely on the PC board for grounding rather than the case. > Clip on ferrite beads on the cables can help. If you were running the amp > into a dummy load then the problem is more likely impedance related as you > suggested. > > When I built my XV222 the manual failed to suggest that the paint be scraped > off the case where the output coax connector is attached. If you haven't > already done this, it might be worth a try just to ensure proper grounding. *Likewise, try scraping paint off the four 2-D attachment points on both the side panels. The paint is very tough and hard to remove but its worth the work. --Lenny W2BVH*
> 73, > Steve VE3SMA > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
