On Mar 16, 2005, at 4:07 AM, Pete Smith wrote:
> Having just killed a Kilovac HC-1 (equivalent to the RJ-1A) in my
> modified SB-220 due to hot switching, I am interested in whether the
> RJ-1H might prove more resistant to operator errors.
>
Yes, because the tungsten contact version is designed to hot-switch. A
simpler solution is to use a speedup circuit so that it won't
hotswitch. As I see it, repeated arcing - of any metal - does the
vacuum no good, so it's best to avoid arcing if possible.
http://www.somis.org/D-a-07B.jpg
> 73, Pete N4ZR
>
> At 05:57 AM 3/16/2005, R.Measures wrote:
>
>
>> On Mar 15, 2005, at 6:50 PM, Marc Chicoine wrote:
>>
>> >
>> >
>> >
>> > Hal,
>> >
>> > Thanks for the guidance for the proper use of "sans".
>> >
>> > Further to my original question:
>> >
>> > RJ1H relays have tungsten contacts used primarily
>> > in hot switching applications. The contact resistance
>> > is 30 mOhms and the current rating falls off much above
>> > 2.5 Mhz. Switching time is a scant 6 ms.
>> > I can obtain new ones for relatively low price.
>> > Are they suitable for Amateur Radio use at full legal power levels?
>>
>> For SSB and CW, yes. However, for RTTY or AØ at 28MHz @ 1500w,
>> probably not.
>> >
>> >
>> > Marc
>> >
>> >
>> >> ----- Original Message -----
>> >> From: "Harold B. Mandel" <ka1xo@juno.com>
>> >> To: <wc1x@btinternet.com>
>> >> Sent: Wednesday, March 16, 2005 00:43
>> >> Subject: Re: [Amps] RJ1H
>> >>
>> >>
>> >>> Dear Marc,
>> >>>
>> >>> Jennings RJ-1H?
>> >>>
>> >>> I know the generic RJ-1 series is good for one (1) ampere,
>> >>> reliably, at 28 MHz., (32MHz., as Jennings puts it), and maybe
>> >>> three (3) amperes at 1.9MHz., but the "H" stumps me.
>> >>>
>> >>> I have RJ-1A's and RF-1's, RJ-2's, 3's, even 2B's and an odd 10,
>> >>> but the H factor needs explaining.
>> >>>
>> >>> If you want to put a vacuum set of relays in the '220, an RF-1E,
>> >>> (SPDT),
>> >>> is great for the input and a 1A would do great on the output, if
>> that
>> >>> answers your question. (Why did you use the word "sans?" That
>> means
>> >>> "without." Did you mean to say "dans," or "within?")
>> >>>
>> >>> Hal Mandel
>> >>> W4HBM
>> >>>> Are Jennings RJ1H relays suitable for R.F. applications? (sans
>> >>>> SB-220)
>> >>>
>> >
>> > _______________________________________________
>> > Amps mailing list
>> > Amps@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>> >
>> >
>>
>> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|
