On Tue, Sep 13, 2011 at 10:48:19AM -0400, Mitch Cox wrote:
> Sounds like a tank circuit issue. You might check to see if the tank coil is
> tapped correctly, From memory I think it should tap on the 4th or 5th turn
> for ten meters. It could be something else but that is what I would look at
> first and then to see that either of the capacitor (C1 & C2) plates are
> touching or arcing on ten.
> ----- Original Message -----
> From: s-roabr@online.no
> To: Mitch Cox ; amps@contesting.com
> Sent: Tuesday, September 13, 2011 1:25 AM
> Subject: Re: [Amps] Ameritron AL-80B
>
>
> Yes, all seems normal in Swr... the tube goes cherry red... so some
> mismatch....other pa gives 1kw on same antenna...
>
> sent by HTC
> LA6FJA K3RAG Stein Roar Brobakken
>
> ----- Reply message -----
> Fra: "Mitch Cox" <ww4cox@embarqmail.com>
> Dato: tir., sep. 13, 2011 00:36
> Emne: [Amps] Ameritron AL-80B
> Til: <amps@contesting.com>, <s-roabr@online.no>
>
> Have you looked at the SWR between the radio and amp on 10 meters?
> ----- Original Message -----
> From: s-roabr@online.no
> To: amps@contesting.com
> Sent: Monday, September 12, 2011 6:18 PM
> Subject: [Amps] Ameritron AL-80B
>
>
> Hi
>
> I have a AL-80B, all bands is ok. But it have max 300w on 10m. Any idea
> how to find out why?
> Any one have had same problem?
>
> sent by HTC
> LA6FJA K3RAG Stein Roar Brobakken
Low power out on 10m and a cherry red plate, together.
The cherry red plate indicates that _LOTS_ of power is moving through
the tube, if I'm not sorely mistaken. But the low power out on 10m is a
sign that that power isn't being generated in the desired band -- which
means it's being generated somewhere else.
I suspect parasitic oscillations, and suggest that it may be time to
neutralize the final on 10m.
I may be completely wrong, and 180 degrees off course. If so, then
someone please point out (GENTLY!) where and how.
--
Mike Andrews, W5EGO
mikea@mikea.ath.cx
Tired old sysadmin
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|