[Kenwood] TS850 and SB200

[Paul Erickson]

Mike,

If ANYONE would know what the relevant ratings are, it would be Clif...

cheers, Paul

Michael Waldrop wrote:
> An amplifier interface between the 850 and the SB-200 was suggested 
> simply because Kenwood's 850 manual did not state what the amplifier 
> relay contact voltage and current ratings were. Therefore, unless 
> these figures are known, it's not a wise idea to simply connect the 
> SB-200's REL connection to the 850.
>
> Although there are quite a number of eBay sellers who sell 
> interconnecting cables for various radios to amplifiers, again, the 
> issue is whether the radio relay can withstand the amplifier's relay 
> voltage and current.
>
> The SB-200 operating instructions can be downloaded free from the bama 
> website. You will have to download the DjVu reader but that too is 
> available from the bama website links to DjVu reader.
>
> However, in the end, it's your radio, your amplifier, and ultimately 
> your choice to make whether you check the voltage and current rating 
> of the 850's relay contacts and compare them with the actual SB-200's 
> relay voltage and current ratings. I would do my homework first and 
> not just plug the amplifier into the 850, but that's me.
>
> 73
> Mike
> W5RKL
>
>
>
>
> --- On *Wed, 11/19/08, Clif Holland /<clif at avvid.com>/* wrote:
>
>     From: Clif Holland <clif at avvid.com>
>     Subject: Re: [Kenwood] TS850 and SB200
>     To: w5rkl at yahoo.com, kenwood at mailman.qth.net, "Michael Brown"
>     <k9mi at sbcglobal.net>
>     Date: Wednesday, November 19, 2008, 8:06 AM
>
>     Why build it at all, not needed....
>
>     Clif Holland KA5IPF
>     www.avvid.com
>
>
>
>
>     ----- Original Message ----- From: "Michael Waldrop"
>     <w5rkl at yahoo.com>
>     To: <kenwood at mailman.qth.net>; "Michael Brown"
>     <k9mi at sbcglobal.net>
>     Sent: Wednesday, November 19, 2008
>      8:02 AM
>     Subject: Re: [Kenwood] TS850 and SB200
>
>
>     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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