[Premium-Rx] Question re WJ 8718A/MFP RF GAIN

[George Georgevits]

Hi Dan,

I have an 8716, not the 8718 MFP. However, on the 8716, as on many other
comms receivers I have used as well, I am pretty sure that AGC (Automatic
Gain Control) and MGC (Manual Gain Control) are considered conflicting
functions, which is why such receivers are designed to have the RF gain only
work when the AGC is turned off.

My guess is that with the AGC ON, the AGC controls gain of the RF stage.
However, the manual RF gain control also controls the gain of this stage, so
the two conflict. The AGC also usually controls the gain of one or more of
the IF stages.

Perhaps someone with more in-depth knowledge may care to confirm this???

Cheers,
George Georgevits
VK2KGG


-----Original Message-----
From: Premium-Rx [mailto:premium-rx-bounces at mailman.qth.net]On Behalf Of
Peter Gottlieb
Sent: Sunday, 1 May 2016 5:44 AM
To: Dan Robinson
Cc: PREMIUM-RX
Subject: Re: [Premium-Rx] Question re WJ 8718A/MFP RF GAIN


I didn't see any response from you on the WJ list. Does AGC function
properly?


Peter

> On Apr 30, 2016, at 3:29 PM, Dan Robinson <dxace1 at gmail.com> wrote:
>
> Hello to all in the group.   I would like to
> repeat her a question I posted earlier in
> the WJ Yahoo group, of which many here
> may be a member, in hopes of finding an
> answer.
>
> The receiver works perfectly except for
> one aspect I have always wondered about,
> which is that the front panel RF gain does not
> seem to function at all.   This is the case when
> the receiver is set to MGC.
>
> I have received several replies asking if I have
> turned automatic gain control OFF, which I
> assume means MGC.
>
> Does anyone who may be a 8718A owner have
> a similar issue or able to provide any information
> on this?
>
> Something tells me that RF was disabled at some
> point years ago with this particular receiver and wonder
> if it's possible to re-enable it.
>
> Thanks
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