HW-101 for PSK31?

[Robert Myers]

Wouldn't you want to bypass the extra-large series resistor with a cap
across it, to let just the leading edge of that voltage take its effect
on the coil (just at the start of the application of the
higher-than-normal voltage)?

It sounded like you were saying to put the cap across the coil.  Or have
I got the wrong idea of the circuit you are talking about?

-- Rob VE3JQL

-----Original Message-----
From: Heathkit Owners and Collectors List
[mailto:HEATH at LISTSERV.TEMPE.GOV] On Behalf Of Wilson Lamb
Sent: Monday, September 03, 2007 12:27 PM
To: HEATH at LISTSERV.TEMPE.GOV
Subject: Re: [HEATH-TEMPE] HW-101 for PSK31?

A crucial part of hot rodding is to use a good big capacitor at the
relay 
coil.  Then the high voltage charges the cap, which supplies the surge
to 
zap the relay in quickly.  Remember that the energy stored in the cap
goes 
up as V^2,  so don't go overboard...Twice normal voltage and a few uF
should 
do it.  With the resistor and no cap, the relay will be slower than
normal.

The 400V story sounds a little high.  The drain would be pretty high on
the 
supply (coil current) and there would be a lot of dissipation in the 
resistor (coil current ^2*R).

Wilson
W4BOH

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