Definitely NOT happening, Antonio. No change in background at all on SSB.
Logical conclusion is that the preamp is not getting any power (or it is defective, but I won't assume that as starting point here).
I checked the supply, the connector (direct DC to the unit via 12V supply), and the coax in.
So maybe I am putting the wrong power to the wrong pins, but I quintuple checked that for this unit (A for +12V, B for ground, C is relay switch if not using RF sensing to bypass during transmit, which I have nothing connected to it).
I rechecked the fitting for power, it is snug.
Mark Lunday WD4ELG wd4elg@arrl.net http://wd4elg.net
-----Original Message----- From: Franklin Antonio [mailto:antonio@qualcomm.com] Sent: Saturday, December 20, 2008 8:07 PM To: Mark Lunday, WD4ELG Cc: amsat-bb@amsat.org Subject: Re: [amsat-bb] Another newbie question
At 03:15 PM 12/20/2008, Mark Lunday, WD4ELG wrote:
I am trying out one of the ARR mast-mounted pre-amps on 432. I just listened to the SO50 and AO51 passes. I swear I cannot hear any
difference,
ok maybe just a bit. But not much, not enough to make a difference.
With the receiver in SSB mode, antenna pointed at nothing, you should hear a substantial increase in background noise when the preamp is turned on. S-meter should jump. If not, the preamp ain't workin'.