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

[Jerry Muller]

The input SWR is flat.

Jerry

----- Original Message ----- 
From: "James Colville" <jimw7ry at gmail.com>
To: "Rex Lint" <rex at lint.mv.com>
Cc: "Amps" <amps at contesting.com>
Sent: Thursday, February 18, 2010 11:22 PM
Subject: Re: [Amps] SB-221 Problem - Slow on the uptake


> What is the input SWR?  What does the exciter show it is?
>
> Jim W7RY
>
>
>
> On Thu, Feb 18, 2010 at 7:04 PM, Rex Lint <rex at lint.mv.com> wrote:
>
>>  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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