[GreenKeys] Drinking to many spice models

[Bob Camp]

Hi

I may be getting my spice models mixed up with my beer bottles here but 
here it goes ....

When you look at the setup on a model 28 keyboard contact set there is 
a cute little RFI filter involved. The thing is pretty well marked and 
it's obvious that it was to be fed with a dual voltage supply that 
would put out something like +/- 60 volts or so. This would make a lot 
of sense for driving a polar signal line.

The setup with all the caps on the contacts does not seem to make much 
sense if you are running a neutral loop that has magnets in series with 
the contacts. As a matter of fact it actually looks like it will create 
quite a bit of distortion ( thus the spice models ...).

I also seem to remember a note somewhere saying that the contacts on 
the model 28 keyboard are not rated for 60 ma magnets in the loop type 
operation. Don't seem to be able to track that note down ( may be the 
now empty beer bottles ....).

Obviously the debate over wet and dry keying has been going on for 
quite a while. I have no doubt that dry keying is a better bet for long 
term 24 hour a day operation and that it creates less RFI. What I'm 
asking about is weather model 28's were designed for wet loops or not.

Back to the beer .... then off to check the lobster.

	Enjoy!

		Bob Camp
		KB8TQ