----- Original Message -----
From: "Jim Thomson" <Jim.thom@telus.net>
To: <amps@contesting.com>
Sent: Thursday, March 11, 2010 4:16 PM
Subject: [Amps] reed relay /vac relay
> Date: Thu, 11 Mar 2010 09:01:17 -0500
> From: "Rex Lint" <rex@lint.mv.com>
> Subject: Re: [Amps] Amps] Solenoid polarity on DC reed relays
> To: "'Bill VanAlstyne W5WVO'" <w5wvo@cybermesa.net>, <n8cc@mei.net>,
> 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-
>
> ## measures uses a reed relay on the input.. and a transistor for
> switching the bias.
> ## come glitch time, don't be surprised when the bias switching doesn't
> work.
>
> ## the drawback to using a reed relay on the input is.. the amp will not
> handle more than 100w
> on bypass ! OK to use a reed relay for the bias though.. as long as
> contacts are up to the job.
>
> ## In my case.. the L4B has a built in wattmeter, and the only way to
> calibrate it is to apply 1 kw from
> a 2nd amp.. via a calibrated wattmter,.. to the input of the L4B [ with
> L4B in bypass mode]
>
> ## In bills case.. he's using vac relays on both input and output. Either
> use a new reed relay
> for the bias.. or a vac relay...esp for qsk
>
> ## If the surplus relay in question , is only good for 100 k
> operations... and no doubt it's used
> it probably does not have a lot of life left in it..esp for qsk use.
>
> Later... Jim VE7RF
Henry used large reed relays for In and Out in the Tempo 2000 which is
actually a Johnson Thunderbolt II that didnt get into production and they
sold everything to Henry.
It runs 1200W out with plenty of caveats in the manual about having low
VSWR. It also used a convoluted SS sequencer.
The last one I had in here got all that crap tossed as the sequencer was
fried and a good ole open frame relay installed.
Carl
KM1H
>
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