[TenTec] Amp Hot Switching Prevention

[Gary Hoffman]

Yes Walt, I thought of that one.

Of course that is slow and awkward in the heat of battle.

But it would certainly work.

73 de Gary


----- Original Message ----- 
From: "Walt Amos" <waltk8cv4612amos at att.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, March 22, 2010 9:48 PM
Subject: Re: [TenTec] Amp Hot Switching Prevention


> Foot switch for the amp!
>
> Walt K8CV Royal Oak, MI.
>
>
> ----- Original Message ----- 
> From: "Gary Hoffman" <ghoffman at spacetech.com>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Monday, March 22, 2010 8:36 PM
> Subject: [TenTec] Amp Hot Switching Prevention
>
>
>> Hi All,
>>
>> I'm having a new (to me) problem with one of my rig/amp combinations.
>>
>> I've begun using my Corsair II with my SB-200 amp in some digital modes -
>> mostly RTTY of course.
>>
>> These rigs were not meant for digital service nor computer control of
>> course.
>>
>> What I have is a rigblaster, and I use a serial port from the computer to
>> both send the digitaal data and the PTT signal to
>> the Corsair through the Mic Jack - in the well known manner.
>>
>> The Corsair switches the amp into transmit through its key line.
>>
>> Unfortunately the rigblaster sends data and PTT to the corsair together,
>> at
>> the same instant.
>>
>> Thus when the amp relay is being switched - the corsair is already
>> outputting RF.  Hot switching the amp in that fashion
>> allows 1 kw of power to see momentarily an open circuit, as the amp relay
>> has not yet reliably closed the contacts to the antenna.
>> This does a LOT of damage !!!
>>
>> I'm sure others have run into this.
>>
>> What are people doing ?  Some other external control box I don't know
>> about
>> ?  Somehow delaying the production of tones in the
>> rig control software ( I'm using N1MM) ?
>>
>> I'd appreciate any useful ideas.
>>
>> 73 de Gary, AA2IZ
>>
>>
>>
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>
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