On Mon, 2007-10-29 at 22:06 -0500, N4YG wrote:
> I just want to thank everyone who advised me to buy the RF Parts 3-500ZG
> tubes for my SB-220. I am very pleased with the tubes. I have about 20% more
> output power and it is almost unbelievable how much cooler the amp runs.
>
> I also completed the QSK mod for the radio, based in large part on the info
> on Rich Measures' web site. I am also very please with that and all works
> well with the OMNI VI +.
>
> I would like to mention one thing. I believe that many of you have installed
> the Soft Key mod in the SB-220. I have studied the schematic for Soft Key
> extensively. I have a much simpler circuit which you can build in a short
> time for an expenditure of only a couple of bucks. It works great. I do not
> know if the name "Soft Key" is intended to be descriptive of the mod or not,
> but its keying is certainly not soft, in fact, why would one want to key the
> amplifier T-R relay softly. Anyone who wishes to know how to build and
> install my circuit can obtain details by sending me an email.
>
> Joe
I think the soft part of the name comes from it taking little power so
the weak outputs of a solid state radio can key it without damage to
those weak outputs.
Can you measure 20% at the other end of the path? That's all of 0.8 dB
and when propagation changes sometimes more than 10 dB in seconds...
73, Jerry, K0CQ
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