----- Original Message ----- From: wa4hfn@comcast.net To: "AMSAT" amsat-bb@amsat.org Sent: Saturday, July 31, 2010 8:45 PM Subject: [amsat-bb] AO27/TS2000
Just installed a preamp Ar2 { Advance Reciever Research) M# MSP432DG-160
and the birdy that the TS2000 has on AO27 recieve is now gone and I was able to hear the bird from start of the pass to the end.Why ,I do not know, but the preamp seems to kill the birdy . Has anyone found this to be the same.
WA4HFN Damon _______________________________________________
Hi Damon, WA4HFN
The pramplifier "seems" to kill the birdy because the preamplifier gain is very high and so the birdy is belove the noise introduced by the preamplifier itself.
I guess that without any signal on the band your S meter reading is well above S-9 only because of the preamplifier noise that is apparently killing the birdy.
If you reduce the gain of your preamplifier to get an S-meter reading of say S-1 or S-2 without any signal on the band then the birdy will appear again.
Best 73" de
i8CVS Domenico