Supply voltage is around 36V as I recall ---
I re-emphasize that the RJ1-A and HC-1 (current production, at least) are NOT
interchangeable with respect to high speed switching. The Kilovac HC-1 has much
more robust guts which flop around a lot less. I recall from our direct
comparisons when designing the ALPHA 91B five or six years ago that
hot-shotting an RJ-1A with 2-4x nominal supply volts makes initial contact
faster, but the follow-on bounce is considerably worse.
73, Dick
-----Original Message-----
From: measures [SMTP:measures@vcnet.com]
Sent: Friday, October 15, 1999 12:34 PM
To: AMPS
Subject: RE: [AMPS] RJ1A/RJ1H for Alpha 78
>
>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.
? To fully close a RJ-1A or HC-1 (26v) in 2mS, my test showed that it
takes around 85, current-limited, open-circuit volts. . What is the
source voltage for the ant. relay coil in the Alpha 78, Dick,?
thanks.
- Rich..., 805.386.3734, www.vcnet.com/measures.
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