[Kenwood] TS850 and SB200

[Michael Waldrop]

The TS-850's internal linear amplifier relay is accessed at the TS-850's REMOTE socket. Pins 2 and 4 (normally open) relay contacts are used to control an amplifier's internal T/R relay. However, the TS-820's manual does not indicate the relay contact's maximum voltage and current rating.

The SB-200's T/R relay is powered from the amplifier's -120VDC negative supply, see SB-200 schematic available on the bama website for free.

Therefore, I recommend using an amplifier relay keying circuit, external to the TS-850, and not connect the SB-200's T/R relay directly to the TS-850. A simple 12VDC amplifier relay interface can be built for less than $20, a lot less if you already have the 12VDC relay on hand. Radio Shack sells 12VDC relays as well as Mouser Electronics and other Internet parts outlets.  Another source is "All Electronics", allelectronics.com, sells relays for less than $3 that will do the job nicely. You don't have to spend $40 to $50 for a simple amplifier relay interface, build it yourself.

73
Mike
W5RKL

--- On Tue, 11/18/08, Michael Brown <k9mi at sbcglobal.net> wrote:
From: Michael Brown <k9mi at sbcglobal.net>
Subject: Re: [Kenwood] TS850 and SB200
To: kenwood at mailman.qth.net
Date: Tuesday, November 18, 2008, 10:54 PM

I'm not an amp person, but isn't the relay on the 850 12 volts dc, and
the SB200 around 120 volts ac? There are plenty of places that make interfaces
for such a combination. Check around, but I'm sure you do not connect an 850
direct to an SB200/SB220, etc.

GL...

73 - Mike K9MI


----- Original Message ----- From: Darrell Drake
To: kenwood at mailman.qth.net ; Brian K. Gaskamp
Sent: Tuesday, November 18, 2008 23:39
Subject: Re: [Kenwood] TS850 and SB200


Brian...

You're playing with very high voltages here. I suggest that you read the
manual for the Heathkit amp very carefully and follow the tuning instructions to
the letter. If you have the plate voltage and current set incorrectly,
you're inviting cherry red (not good at all) and possibly arcing 572B tubes,
which are quite expensive to replace.
You are correct about the RCA phono jack. That's the input from the exciter
(Knwd) to the amplifier.
Also, read the manual for the Knwd TS-850 as it pertains to running the radio
with an amplifier.

Good Luck and do take care with that amp. Its voltages are LETHAL.

Darrell,
VA3DG/VE3DDG

--- On Tue, 11/18/08, Brian K. Gaskamp <ka5bkg at sbcglobal.net> wrote:

From: Brian K. Gaskamp <ka5bkg at sbcglobal.net>
Subject: [Kenwood] TS850 and SB200
To: kenwood at mailman.qth.net
Received: Tuesday, November 18, 2008, 10:45 PM


I think I got that last one right so I taking a guess.
I do know its a Heathkit amp.

I would like to run the above combo for the upcoming ARRL 10m contest.

Any suggestions on what I need to do.

I have never ran a amp with a HF radio so I'm open to any and all
suggestions.

If its any help I do know the back of the amp has a unusual connector, not a
SO-239.

I want to say like a RCA type jack.

73,
Brian

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