[TenTec] Argonaut 509 Bias Mod

[Byron Tatum]

Hello Stuart-
    Thank you so much for the nice advice. I have noticed electrolytics in 
the AGC circuit and they are fairly old, so that will be my first try!
                                                Thanks, Byron
----- Original Message ----- 
From: "Stuart Rohre" <rohre at arlut.utexas.edu>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Tuesday, August 04, 2009 2:21 PM
Subject: Re: [TenTec] Argonaut 509 Bias Mod


> Byron,
> I "think" the pop on strong stations on the 509 is audio derived AGC.
> As I recall, and I am going from uncertain memory, rigs with audio
> derived AGC have to use a large capacitor which charges up.  The pop is
> an artifact of that design.  It "may" improve if the capacitors are
> updated to fresh ones.  Look for an electrolytic typically.  This is a
> problem not only on the 509 but also on many simple kit QRP rigs today
> with that type of AGC.  A work around might be to add an RF attenuator
> to cut down the signal level of extremely strong stations.
>
> Stuart
> K5KVH
>
>
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