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
----- Original Message ----- From: [email protected] To: "AMSAT" [email protected] 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
To improve the birdie issue on the TS-2000, be sure to keep your antennas well away from the radio. I found the birdie less serious recently, now that my antennas are 100' away.
73, Bruce VE9QRP
On Sat, Jul 31, 2010 at 4:28 PM, i8cvs [email protected] wrote:
----- Original Message ----- From: [email protected] To: "AMSAT" [email protected] 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
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
At 11:28 AM 7/31/2010, i8cvs wrote:
----- Original Message ----- From: [email protected] To: "AMSAT" [email protected] 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
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Not sure this is the same explanation as Domenico gave, but, if the birdie is internal to the radio, running an external preamp operates the radio at a signal (plus noise) level above the level of the birdie.
The noise rises due to the exta gain but the noise floor actually can be lower due to the increase in sensitivity (lower noise figure). Does this make sense? In other words, the radio may go from operating at -122 dBm to operating at -110 dBm (if preceded by 22-dB gain) and the receiver system (Rx+preamp) operate at -132 dBm (not necessarily what your system will do). The birdie is not amplified but the signal+noise is. This usually does not help with birdies external to the radio.
73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-QRT*, 432-100w, 1296-QRT*, 3400-fall 2010 DUBUS Magazine USA Rep [email protected] ====================================== *temp
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i8cvs -
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