[AMPS] RJ1A/RJ1H for Alpha 78

[Richard W. Ehrhorn]

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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