Amps
[Top] [All Lists]

[AMPS] RJ1A/RJ1H for Alpha 78

To: <amps@contesting.com>
Subject: [AMPS] RJ1A/RJ1H for Alpha 78
From: w4eto@rmi.net (Richard W. Ehrhorn)
Date: Fri, 15 Oct 1999 11:41:24 -0600
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................


--
FAQ on WWW:               http://www.contesting.com/ampsfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm



--
FAQ on WWW:               http://www.contesting.com/ampsfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm


<Prev in Thread] Current Thread [Next in Thread>