[AMPS] RF sensing

[2]

>
>I am more than a little surprised at your answer.  The RF does NOT appear at 
>the amplifier any SOONER using RF switching than it does using DC switching. 

>
//  'Exactamente', and therein lies the problem.  With RF switching. the 
amplifier's RF  relays can not begin transitioning until RF is present.  
This is not good news.  However, with transceiver-controlled DC 
switiching, the relays are fully closed before RF arrives at the amp's 
input. 


>The timing problem will be identical with either type of switching.

//  hardly.  Copper-contact vacuum relays are not designed to hot-switch. 
 For tungsten-contacts, hotswitching is not a problem.  

cheers

>I have used this type of switching for 35 years and have had no problems.  I 
>aquired a Henry 4K back about 15 years ago that was almost toast.  When I 
>rebuilt it, I used RF sensing and still incorporated sequencing the relays. 
>That amp is still in use at a friends shack in Turlock, California.
>
>Billy Dean Ward
>
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>>From: "Tom Rauch" <w8ji@akorn.net>
>>Reply-To: W8JI@contesting.com
>>To: amps@contesting.com, "Billy Ward" <billydeanward@hotmail.com>
>>Subject: Re: [AMPS] Gound fault
>>Date: Fri, 10 Aug 2001 08:30:28 -0400
>>
>> > Since this is a product specific product wirh a product that I have had 
>>no
>> > experience with, I am lost!  However, if it turns out to be complex, you
>> > can do a simple thing with one transistor as an RF sensing switch.
>> >
>> > I will send you the circuit that I designed many years ago if you need 
>>me
>> > to.
>> >
>> > Billy Dean Ward
>>
>>The last thing in the world anyone should do with an HF amplifier is
>>use an RF sensing system to switch the thing!
>>
>>Timing problems are bad enough without waiting until RF appears
>>to transfer the amplifier relay!
>>
>>I don't understand the problem the person described. The Drake
>>has an internal supply for the relay. Why does it need external 12v?
>>
>>
>>
>>
>>73, Tom W8JI
>>W8JI@contesting.com
>
>
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-  R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.  
end


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