[Heathkit] Amp Keying Interface?

[john]

Yep! Might be nice to put a diode across the coil to clamp the coil when 
the 12V is removed.

John K5MO


At 02:05 PM 7/31/2007, Bob McGraw - K4TAX wrote:
>Be advised that Harbach Electronics is closed due to health reasons and 
>not accepting orders at this time.
>
>A simple keying interface is a 12VDC coil relay with N.O. contacts 
>available from Radio Shack.  Enclose same in a small "project box" with a 
>couple of connectors of your choice.  The 12V is from the FT-847 and the 
>normal keying ckt and the N.O. contacts go to the SB-200.  The project 
>should cost about $6.00 for all the parts and then have the fun of 
>building something that works.
>
>73
>Bob, K4TAX
>
>
>----- Original Message ----- From: "Stephen Goldberg" <w2imf at worldnet.att.net>
>To: "kb0nly" <kb0nly at mchsi.com>; <heathkit at mailman.qth.net>
>Sent: Tuesday, July 31, 2007 12:51 PM
>Subject: Re: [Heathkit] Amp Keying Interface?
>
>
>>www.harbachelectronics.com.  Soft key module $25.
>>
>>Steve W4IMF
>>
>>----- Original Message ----- From: "kb0nly" <kb0nly at mchsi.com>
>>To: <heathkit at mailman.qth.net>
>>Sent: Tuesday, July 31, 2007 1:34 AM
>>Subject: [Heathkit] Amp Keying Interface?
>>
>>
>>Anyone know of a good design to interface the SB-200 to a modern radio, 
>>such as my FT-847?  I have been looking online and can't find much other 
>>than a few commercial products that seem to be far overpriced for what 
>>they are and I would like to build something myself.
>>
>>This isn't my first tube type amp, but its the first time I'm going to 
>>interface it to a modern radio, and I know the 847's circuitry can't 
>>handle the SB-200.
>>
>>Thanks and 73,
>>
>>Scott
>>
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