[Heath] HW100/101 curiosity

[Glen Zook]

As for the bypass capacitors:  Collins does the same thing in the S-Line transmitters and in the KWM-1 and KWM-2 series.  There is enough inductance in the leads within the 6146 family to cause spurious oscillations at VHF and UHF.  Therefore, the need to bypass all 3 of the cathode connections.

Some transmitters might not have problems, but, to be on the safe side, Collins bypassed all the cathode connections and Heath followed suit.
 
Glen, K9STH


Website:  http://k9sth.com


________________________________
 From: Dick KF4NS <kf4nsradio at verizon.net>
To: Heath puck list <heath at puck.nether.net>; heathkit at mailman.qth.net 
Sent: Wednesday, May 23, 2012 7:15 PM
Subject: [Heath] HW100/101 curiosity
 
Hi guys,

A couple things have always bugged me so I will ask the questions now and see what I can determine.

In the alignment, I have always wondered why, after all the time spent adjusting the HET. OSC. coils to
the spec, why do we need to start all over again when we do the transmit alignment ??

Also, in the finals, pins 1, 4 and 6 are tied together between the two tubes, so why the redundancy with
three .005 mfd bypass caps on each tube? Would it not be just fine to have only one cap for both tubes
instead of six caps ?  The tube spacing is so close I see no need for the multiple caps.
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