Hi Don and the list, After replacing R6 on the KAT2 board I went back thru the transverters to see where I am at after the change.
XV144 - ~1mW of drive = 12w power (into a Bird 43 slug + dummy load) Target is 25w XV222 - ~.42mW of drive (virtually no power out) Target is 10w XV432 - ~.50mW of drive (virtually no power out) Target is 10w I decided to go back to the XV432 since that is what we have been talking about recently. After peaking the filters again and I am seeing about 1.9V at TP6. What kind of number should I see? I will pick this up again in the morning when I my mind is fresh. 73 -- John Hoaglun NG0R - EN25 http://www.hoaglun.com On Sat, 2010-08-21 at 16:42 -0500, John Hoaglun wrote: > Hi Don & the list, > > I am making some slow progress on the 432 transverter setup. > > Initially TP6 was almost nill so I hooked up the Oscope and worked my > way from the IF-In to the Mixer. The 28MHz band pass looked suspect, > specifically C52/C54 as the drop at each capacitor was pretty sharp > even for a BP filter. I replaced them with fresh 150pF caps that I had > on hand. That improved the situation but my levels were still low > measured at TP5, TP6, and the output with an RF meter, and analyzer. > > I tried tuning up the filters with using the analyzer & rf meter. That > once again slightly improved things but not enough to quantify. > > I reset the PA bias back to the 20mV and then went to TP6 again. I was > able to very slowly move from almost 0 to 2V by working my way thru > the filters and then going back thru it again several times > > TP3/TP4 20mV > PA voltage 2.35V & 13.7V > TP5 0V > T6 2.05V > U6 Output pin 4.97V > > My 60MHz Oscope is not fast enough to make a good measurements at U6 > IN/OUT and U7 IN/OUT but it does not appear that I am seeing enough > gain at U6. I suspect that U6 is not driving U7 hard enough for U7 do > any work. > > Any suggestions how to test this? > > What else should I be looking at & testing? > > Thanks, JH > > -- > John Hoaglun > NG0R - EN25 > http://www.hoaglun.com > > ______________________________________________________________ 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
