I have been using single Kilovac HC-1 and Jennings RJ1A relays for input and
output T/R switching on all of my single 8877 amplifiers for the past 25
years.
Even in heavy contest operating, I have had no problems at 1500 watts output
up through 50 MHz.
73!
Tim K3LR
http://www.k3lr.com
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Steve Cook
Sent: Sunday, March 30, 2008 11:50 AM
To: Harold Mandel; Amps
Subject: Re: [Amps] Relays
You can parallel several RJ-1 relays -- speed and current rating.
----- Original Message -----
From: Harold Mandel
To: Amps
Sent: Sunday, March 30, 2008 5:00 AM
Subject: [Amps] Relays
When I first saw a Jennings RJ-1, and
compared it to the open frame relay my
'220 was using, it was astonishing.
That was because vacuum relays are
good for isolation.
However RJ-1's are virtually useless
for a decent QRO rig above 20 meters
and that's because the RF ampacity
diminishes so rapidly with frequency
change.
On bigger tube rigs it was necessary to
graduate to an RJ-2, but remember, those
vacuum relays only carry 12 amps at 32MHz.
So then there's the Jennings RF-10C.
The problem with getting vacuum relays with
enough contact gusto is they slow down because
of mass and inertia. The RF-10C is not too good
at 50WPM as you can imagine.
So it's a toss-up: You get a relay capable of
high speed QSK and it has poor ampacity and
blows out frequently, or you get an elevator
contactor.....
Hal
W4HBM
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