[TenTec] O2 Receive Insensitivity

[Duane Calvin]

Keith,
Besides RF gain, as Carl mentioned, also check the settings you may have
changed on the programmable AGC.  I've found at times after I've been on the
low bands and cranked up the threshold that I was deaf next time I turned
the rig on.  Of course, I had forgotten I had overridden the AGC values and
dialing them back fixed it.  Also check for the ATTN value.

	73, Duane

Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com  
 

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of ac9s at mchsi.com
Sent: Friday, October 20, 2006 9:58 PM
To: tentec at contesting.com
Subject: [TenTec] O2 Receive Insensitivity

I have had a strange thing happen with my O2.  I have been impressed with
the 
sensitivity of the receivers, unlike my Pro.  However, in the last day or
two 
the main receiver seems to have gone very deaf. However, with the pre-amp on
I 
receive signals strongly.  It is currently 9:30pm on Friday evening and I am

listening to JARTS on 20 RTTY.  With no pre-amp I can barely hear AH7C and 
there is no indication of band activity on the band scope.  With the pre-amp

on AH7C is registering S9 and there are a whole bunch of copyeable RTTY 
signals showing strongly in the band scope.  In the past the pre-amp seemed
to 
give me about an S unit or so of increase on the S meter.  Now, it is the 
difference between nothing and S9.  The sub receiver appears to be hearing 
about the same as the main with the pre-amp, but of course I cannot see its 
signals on the band scope.

Has anyone else experienced these symptoms?  Is it possible I could have had
a 
static discharge on one of my wire antennas zap the main RX front end and
not 
bother the pre-amp if it was turned off?  I haven't normally used it.  I am 
listening with the AGC set to the minimum of .37uv.

My first thought was that the higher bands are completely dead at the bottom

of the cycle, but since I am hearing so well with the pre-amp on there
appears 
to be something else at play.  

Any thoughts anyone - before I contact Ten Tec?

Thanks --- 

Keith
AC9S
_______________________________________________
TenTec mailing list
TenTec at contesting.com
http://lists.contesting.com/mailman/listinfo/tentec