>
>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
>
>
>
>
>
>
>
>
>>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
To: <amps@contesting.com>
>>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.
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