N1BUG wrote: > oscillate. The 25+ dB gain, very low noise figure VHF/UHF preamps I > am more used to can get pretty squirrelly with something other than > 50 ohms on the input. > > 73, > Paul N1BUG
On low bands, I routinely put a small (IE 10 pF) capacitor across the input of RF gain blocks to kill the bandwidth and prevent high frequency oscillations. With this in place, they should be fine with a "short" even if the short is somewhat inductive at VHF. Rick N6RK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
