Soft Key for SB-200

[F. V. Encarnacion, Jr.]

Belay my last! The brain tried to think before the coffee took effect...

The relatively high voltage is on the linear amp side (switched side)
and so it doesn't matter what the keying side voltage rating is.

Sorry gang! :-(


-----Original Message-----
From: David Humbertson <daveh at HEREINTOWN.NET>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Saturday, October 16, 1999 11:10 AM
Subject: Re: Soft Key for SB-200


>Hello,
>I have the softkey mod in both a SB-220 and 200 and I only
>use older Heath and Drake rigs to drive them. The orginal voltage
>and current on the keying line will even eventually pit the contacts
>on the old gear - many commonly used a 220 ohm resistor in series
>with the keying line to limit this when using the stock keying circuit.
>So, with a softkey type of mod installed you can use ANY rig to drive
>them - the relays in the older stuff will last forever (contacts
anyway).
>--
>73, Dave - W3NP
>Ft. Ashby, WV
>
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