[Amps] Amps] Solenoid polarity on DC reed relays

[Rex Lint]

Bill,

I'm doing a similar project with my SB-220, but the HF version.  I got the
reed relay from Richard Measures.  He also has things to say about snubbing
diodes and resistors.  See 
"High Speed Switching / QSK for the TL-922 and SB-220..." at
http://www.somis.org/QSK922.html, and his order page at
http://www.somis.org/Price-Info.html.  I haven't done the mods yet...

    -Rex-

     Rex Lint, Consultant
     26 Brek Drive
     Merrimack, NH 03054
     PH:    603-860-7651    

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Bill VanAlstyne W5WVO
Sent: Wednesday, March 10, 2010 3:50 PM
To: n8cc at mei.net; [Amps]
Subject: Re: [Amps] Amps] Solenoid polarity on DC reed relays

Hmmm, you might be on to something here, Jeff. My assumption came from this 
on the MGS site:

" NOTE: Our customers who buy these [vacuum RF] relays frequently are also 
seeking high speed reed relays or switching relays. We have the ideal answer

in our RFK-6396 relays, here: 
http://www.mgs4u.com/RF-Microwave/RFrelays_misc.htm "

The URL is for the page on which the RGS-6396 relay is featured. I guess I 
"read into" this that the RGS-6396 is a reed relay. You're right, though, it

doesn't really say that it is. And the fact that the relay makes a very 
pronounced and tactile CLICK when actuated or released makes me think it is 
probably just a very fast armature relay.

Another thing I just noticed (why don't I "notice" these things a little 
earlier in the game?) is that the auxilliary contact set is rated for 2A @ 
28VDC, and I'm planning on switching up to 120V cut-off bias with it. Duh...

Will probably handle it OK as the current is very low... Oh well.

CCing this to the list for others' benefit...

Bill W5WVO


--------------------------------------------------
From: <n8cc at mei.net>
Sent: Wednesday, March 10, 2010 1:23 PM
To: <w5wvo at cybermesa.net>
Subject: re:Amps] Solenoid polarity on DC reed relays

> Bill,
>
> Are you sure it is actually a reed relay?  I'm curious
> because I'm using them in a six meter amp, and I can't
> find anyplace where MGS says it is a reed relay.
>
> Maybe this is something that's just a 'given' and is
> obvious to all but me... wouldn't be the first time! :-)
>
> 73, Jeff - N8CC
> ____________________________________________________
>
> Amps] Solenoid polarity on DC reed relays
> Bill VanAlstyne W5WVO w5wvo at cybermesa.net
> Wed Mar 10 11:43:39 PST 2010
>
> Previous message: [Amps] Solenoid polarity on DC reed relays
> Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
>
>
----------------------------------------------------------------------------
----
>
> Thanks for the tip. The solenoid coil measures exactly the same in both
> directions (670 ohms), which is pretty close to the claimed coil
> resistance
> (675 ohms). Also, when using the DVM's diode/continuity test
> position, the
> coil reads "OPEN" in both directions, indicating that there is no
> diode in
> there.
>
> So apparently this relay does not contain an internal snubber.
>
> But now that you've brought the question up...
>
> The circuit I've designed uses two Kilovac HC-1 (26.5V) vacuum
> relays and
> this small 26.5V reed relay all in series with an appropriate dropping
> resistor (and an appropriate current shunt resistor across the reed
> relay),
> all across 120VDC as supplied by the SB-220 and switched through a
> Harbach
> T-R board. What method of relay coil snubbing would be "best
> practice" in a
> setup like this? Is a simple reverse-biased rectifier diode across
> each coil
> sufficient?
>
> Bill W5WVO
>
>
>
>
>
> 

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