I never have heard of nor have I ever seen specs for an amplying device, ie
transister or IC, which does not generate internal noise. Low noise,
yes.....no noise, never. Keep hoping though...maybe some day!
-----Original Message-----
From: K3BU@aol.com <K3BU@aol.com>
To: tentec@contesting.com <tentec@contesting.com>
To: <tentec@contesting.com>
Date: Friday, July 23, 1999 5:31 PM
Subject: Re: [TenTec] Omni VI plus - noise & INRAD filters
>
>jreid@aloha.net writes:
>
><< I do get the noise, whether the antenna input
> terminal to the Omni VI+ is left "open" or terminated in
> 50 ohms. BTW, the S-meter reads zero deflection. And,
> yes, perhaps even in the background, below or at the level of
> rigs RF stage internally generated noise, I can hear
> a faint "whine". >>
>
>
>There is a big difference between noise due to the receiver sensitivity
(with
>antenna connected) and noise generated internally (antenna disconnected,
DSP
>and LP off). Again, what we are concerned (complaining, or trying to
improve,
>rectify) is the internal noise generated by the IF stages after the crystal
>filters. This noise is characterized by high pitched noise that is detected
>and amplified by the audio stages (annoying hiss). The possible solutions
>could be adjusting the working parameters of IF amplifiers, or adding
>filtering before the detector.
>The point is, your multi $k rig should be dead (or close to) quiet when
>antenna is not on or ant input is shorted out.
>When you connect antenna and hear noise, you got sensitive receiver (or
noisy
>neighborhood). We are not talking about that situation at all. THAT is
normal!
>
>Aloha and Sayonara
>Yuri, K3BU
>
>--
>FAQ on WWW: http://www.contesting.com/tentecfaq.htm
>Submissions: tentec@contesting.com
>Administrative requests: tentec-REQUEST@contesting.com
>Problems: owner-tentec@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
>
--
FAQ on WWW: http://www.contesting.com/tentecfaq.htm
Submissions: tentec@contesting.com
Administrative requests: tentec-REQUEST@contesting.com
Problems: owner-tentec@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|