[Orion] Question about noise floor

[Robert & Linda McGraw K4TAX]

Lots of gain = lots of noise.  With no signal or external noise the AGC, a
normal condition, allows the receiver to go to max gain.  No problem, just
re-adjust the AGC threshold.

As Bill, W4ZV, said "AGC is the trickiest thing to learn to use on Orion
IMHO."


73
Bob, K4TAX

----- Original Message -----
From: <Kc9cdt at aol.com>
To: <orion at contesting.com>
Sent: Monday, November 10, 2003 7:35 PM
Subject: [Orion] Question about noise floor


> Continuing to get aquainted with my ORION.
>
> Doing some basic A,, B  Testing today ORION againt my 746 PRO.
>
> Noticed a big difference in the background noise of the ORION compared to
the
> 746 during normal operation on 20M DX net today (14.247 NET). During
periods
> of good signal, no problem..... but during breaks in the conversation,
very
> noisey and continuous noise. This noise is there whether there is an
antenna
> hooked up or it is grounded ( or just no antenna connected at all. This is
with
> normal audio gain, not turned way up.
>
> So , I did a test, ORION with no NR on = very loud  and annoying
background
> noise... THIS IS EVEN WITH THE ANTENNA SELECT COAX SWITCH ON NO ANTENNA,
This
> grounds the antenna connection to the ORION.  S meter not moving up,,,, so
IT
> IS NOT Atmospheric in nature as no signal to the antenna connector.
>
> With the NR on,,, SILENCE... OK but with it off (Which we of course will
do
> sometimes) pretty loud noise
>
> Any one have any input... is this normal on them all, or do I have a bad
one.
>
>
> OH, by the way, I have tried it with all kinds of different levels of NR,
and
> different AGC settings..... no change
>
> Thanks,
> Lee, KC9CDT
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