Hi Mike...
Recent years' production of the Kilovac HC-1 vacuum relay (looks almost
identical to Jennings RJ1-A and installs identically) has substantially more
robust innards with far better bounce characteristics. That's why ALPHA/POWER
uses them in the new ALPHA 99 and former '91B. Price is about the same.
In any case, vac relays normally should last for several years' hard QSK use in
the '78 unless something in the timing/sequencing circuitry (including related
off-board rf detectors) is amiss. Might be worth checking out.
BTW the '78 has a "speed-up" or "hot-shot" circuit that should close the vac
relay within ~2 msec. So far as I know that's plenty fast for any popular xcvr
in QSK mode or otherwise...
Good luck.
73, Dick W0ID
-----Original Message-----
From: Michael Tope [SMTP:W4EF@pacbell.net]
Sent: Sunday, October 10, 1999 6:40 PM
To: 'AMPS'
Cc: 'N7UE'
Subject: [AMPS] RJ1A/RJ1H for Alpha 78
Does anyone have suggestions (aside from not running QSK) on
how one can extend the life of the RJ1A vacuum relay in the
Alpha 78 amplifier? Our club station has two of these amplifiers
both of which seem to have a propensity to "eat" RJ1As on
a regular basis.
One suggestion given to me was to substitute an RJ1H for the RJ1A.
Any thoughts out there on this idea (I am not familiar with the
RJ1H)? How about PIN diode solutions?
In the meantime, does anyone know of good (i.e. cheap) source for
the RJ1A, I want to pick up a spare before one of club's Alphas
gets hungry again?
Thanks,
Mike, W4EF................
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