[Kenwood] TS850 and SB200

Thu Nov 20 21:54:27 EST 2008

Every heathkit amp i've seen uses the same relay. All of them are 140 vDC at 
nearly 1 amp. NO ricebox can handle that as they have a transistor doing the 
switching. I see that this guy has an EXTRA license.Some where he needs an 
elmer to show him the ropes. It will also help if he looks up some of this 
stuff
himself so he will learn some of the ins and outs of this hobby. Mike G 
w6we Lic since 1954
----- Original Message ----- 
From: "Paul Erickson" <va7nt at telus.net>
To: <kenwood at mailman.qth.net>
Sent: Thursday, November 20, 2008 6:33 PM
Subject: Re: [Kenwood] TS850 and SB200
> 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,ドル 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ドル that will do the job nicely. You don't have to spend 40ドル to 50ドル 
>> 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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