[amsat-bb] Re: Another newbie question

Mark Lunday, WD4ELG mlunday at nc.rr.com
Sat Dec 20 17:40:46 PST 2008

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 at arrl.net

-----Original Message-----
From: Franklin Antonio [mailto:antonio at qualcomm.com] 
Sent: Saturday, December 20, 2008 8:07 PM
To: Mark Lunday, WD4ELG
Cc: amsat-bb at 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
>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'.

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