[ARC5] "Quiet" ARC-5 Keying

[Ian Wilson]

[Replying to a very old thread here].

I finally seem to have some time to get some of my ARC-5 gear on the air
again.
One thing I would like to do is to try out keying
  a) using the Selector relay in the TX (with contacts adjusted so PA turns
on first),
  b) using a HV MOSFET in the B+ supply (external to the TX).

I have a few FQP2N80 that look good to me (800V, 85W). Does anyone have an
actual circuit (different devices, no doubt) that I could start from?

73, ian K3IMW


On Fri, Aug 26, 2011 at 2:06 PM, David Stinson <arc5 at ix.netcom.com> wrote:

> If you really want to keep the keying "quiet," key all the B+
> (meaning just the 550 volt line into the "correct" voltage divider
>  per the manual and a past post)   as Mike suggests,
> but do it with a Hi-Voltage MOSFET.
> Here's a new one that can handle 900 volts at 20 amps!
> http://search.digikey.com/scripts/DkSearch/dksus.dll?
> Detail&name=497-8772-5-ND
> FETs for switching high voltages and currents are common now.
> I invite The Smart People here, who have helped me many times,
> to tell you all about it.
>
> 73 Dave S.
>
> P.S. Ian; was I supposed to send you some information?
> Please forgive as I tend to forget things lately... very
> troublesome...
>
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