Trevor
That circuit works well if you only have a 13V typical radio supply. You
can string several relays from the T/R line but remember to fit a 1N4000
type diode across the relay, + end to supply, -end to the T/R line.
It's important to take into account your linear amplifier (if you are using
one) as well. If you have a radio that can delay RF after sending the
PTT/transmit signal, that is an advantage to avoid hot-switching.
The slowest relay in your system might be the one in the amplifier, but
that's slow to energise and slow to de-energise. Make yourself a little
timing diagram of what you need. I think this is in various handbooks.
Give more info on your *complete* set up.
David
G3UNA
----- Original Message -----
From: "Richard (Rick) Karlquist" <richard@karlquist.com>
To: "MR TREVOR DUNNE" <ei2glb@eircom.net>; "'topband List'"
<topband@contesting.com>
Sent: Tuesday, November 14, 2017 9:37 PM
Subject: Re: Topband: Vac relay keying
See:
www.k6xx.com/radio/fastrely.pdf
Rick N6RK
On 11/14/2017 11:51 AM, MR TREVOR DUNNE wrote:
Hi Guys
Can someone point me in the direction of a circuit I can use to key a 26v
vacuum relay using the tx out on my rig,
I have a 24v PSU I just need to know how to switch on the feed to the
relay as quick as possible when I TX,
Thanks
Trevor
EI2GLB
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