Harbach Softkey

[F. V. Encarnacion, Jr.]

Mark,

Good question. I've never considered that configuration - I use an
SB-200 w/o softkey as part of my nostalgia SB series set-up. I do have a
soft key module on an SB-201 that I use with a Kenwood rig.

I pulled out my files and am looking at the hand-drawn schematic on page
2 of the instructions.  I would say you probably shouldn't key the soft
key with a SB-400/401 or similar rig.  The keyed side components, i.e.,
the diode is rated at 20V, the electrolytic capacitor is rated for 6.3
v, and I don't know if the LED side of the optocoupler could handle it
either,

I've got an outboard DSP unit that requires PTT.  I  really do not need
the soft key as I use a 6V (low current coil) relay with DPST contacts
to "key" the linear and the DSP unit.  I use a common wall wart DC low
current power supply in series with  relay coil and the Kenwood keying
circuit.

Hope this helps.

George AH6BV/1

-----Original Message-----
From: Mark Adams <madams0 at US.IBM.COM>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Friday, October 15, 1999 10:21 PM
Subject: Harbach Softkey


>Just have a question about the Harbach Softkey mod for the sb-2**'s.
If this
>mod is installed can you still use a Heath exciter or do you have to
take this
>mod out if you are not using a solid state rig.
>
>Thanks in advance,
>
>Mark D. Adams
>
>Sponsored by the City of Tempe
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