|[AMRadio] switch help|
wa5cmi at attbi.com
Sun May 18 17:55:31 EDT 2003
Ditto what Dave said.
From: amradio-admin at mailman.qth.net
[mailto:amradio-admin at mailman.qth.net]On Behalf Of Dave Aabye
Sent: Sunday, May 18, 2003 4:11 PM
To: amradio at mailman.qth.net
Subject: Re: [AMRadio] switch help
The circuit is on p. 196 in my 1968 Handbook.
It looks to me that S1 needs to be NON-shorting. For S2, I can find only
wafers on the schematic (S2A and S2B), so it looks like 2-pole is OK.
73 de Dave
> howdy Mike
> run and ger your mid 60's copy of the arrl handbook. Look up the amplifier
> project that yields seperate 813 amp for each band. You've seen it before
> sure, at least a trillion times LOL
> okay.. I'm not really following thier RF deck completely, but I'm using
> metering and screen/grid bias - control schematics.
> If you look where they list the parts, s-1 is shown to be a 2 pole 3
> rotary switch, shorting type, and it controls the screen metering. In one
> position you look at V-1, the middle position is BOTH tubes, and the third
> position is V-2. WHY DOES THAT HAVE TO BE A SHORTING SWITCH???????? I
> it is mislabled myself.
> S-2 is shown to be a 2 pole 3 position, rotary switch, non-shorting.
> at the schematic this should be a THREE POLE switch. So possibly another
> take a gander and let me know what you think.
> If NEITHER one has to be shorting, I got 'em covered here.
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