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

[Rex Lint]

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 at 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 at 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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