[Heathkit] HW100/101 curiosity

[Bwana Bob]

Dick:

Well, this is my opinion:

Tuning the het osc coils in receive mode  gets you in the ballpark, so 
the receive tuning is preliminary. The tuning for maximum transmitter 
output is more critical. Just tuning on receive will not maximize 
transmitter output.  Just tuning on transmit, one might miss the peak 
entirely.

Even though the jumpers between the finals are short, they do have some 
inductance. Heath probably wanted to keep the impedance to ground very 
low so as to prevent the jumper inductance from causing parasitic 
oscillations in the final.

Bob WB2VUF

On 5/23/2012 8:15 PM, Dick KF4NS wrote:
> 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.
>
> 73, Dick KF4NS
> St Petersburg, FL 33714 USA
> Keep The Glow!
>
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