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Re: [Amps] SB-221 Problem - Slow on the uptake

To: "Rex Lint" <rex@lint.mv.com>, "'James Colville'" <jimw7ry@gmail.com>
Subject: Re: [Amps] SB-221 Problem - Slow on the uptake
From: "Jerry Muller" <k0tv@k0tv.com>
Reply-to: Jerry Muller <k0tv@arrl.net>
Date: Fri, 19 Feb 2010 05:31:12 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
I have looked at the input network and completely removed it from the 
circuit. I made a direct connection from the relay to the heater blocking 
cap and it made no difference.

73, Jerry

----- Original Message ----- 
From: "Rex Lint" <rex@lint.mv.com>
To: "'James Colville'" <jimw7ry@gmail.com>
Cc: "'Amps'" <amps@contesting.com>; "'Jerry Muller'" <k0tv@comcast.net>; 
"'Lee Hill'" <LHill@silent-solutions.com>
Sent: Thursday, February 18, 2010 10:04 PM
Subject: Re: [Amps] SB-221 Problem - Slow on the uptake


> Does it with ALL exciters.  Guess the input network is something we 
> haven't
> looked at though.
>
>
>
> Thanks,
>
>
>
>      -Rex-
>
>
>
>     K1HI
>
>       Rex Lint
>
>       Merrimack, NH
>
>
>
> From: James Colville [mailto:jimw7ry@gmail.com]
> Sent: Thursday, February 18, 2010 8:15 PM
> To: Rex Lint
> Cc: Amps; Jerry Muller; Lee Hill
> Subject: Re: [Amps] SB-221 Problem - Slow on the uptake
>
>
>
> Sounds like your exciter has a problem...Or it has a problem with the load
> (amplifier).  Why not simply key the amplifier BEFORE you put the rig into
> transmit mode?
>
>
>
>
>
> 73
>
> Jim W7RY
>
>
>
>
>
> On Thu, Feb 18, 2010 at 9:01 AM, Rex Lint <rex@lint.mv.com> wrote:
>
> Hi Wizards,
>
> After I replaced the TR relay, the amp seems to take a 20 milliseconds to
> develop full output.  That tends to clip off part of the first CW 
> character.
>
>
> We jumpered the bias ON, then switched the AMP KEY relay and the output is
> not up to full output right away, so we determined it's not the bias.  We
> disconnected the ALC circuit at the joint with the output from the input
> circuits, and still no joy.  Other recent mods:  rebuilt the bias circuit
> after parasitic incident, including replacing zener.
>
> Any ideas as to what might cause this?
>
>     -Rex-
>
>    K1HI
>      Rex Lint
>      Merrimack, NH
>
>
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