[Heathkit] HW100/101 final tank coil

[Tom Chesek]

I have two HW-100 radios and both of them have the coil wound in the grooves 
evenly spaced. I also have an SB-101 where the coil appears wound like you 
describe yours. All of my radios were owned by others previously so I can't 
tell you if any were modified. Only one of them is air-worthy (HW-100) but I 
don't know offhand how well 10 meters performs since I never use it on 10 
and I don't currently have it on my desk to be able to test it.


Tom
K3TVC


----- Original Message ----- 
From: "Dick KF4NS" <kf4nsradio at verizon.net>
To: <heathkit at mailman.qth.net>
Sent: Tuesday, November 18, 2008 7:03 PM
Subject: [Heathkit] HW100/101 final tank coil


> Ok guys, I just discovered something I had not noticed in the 38 years
> I have been using my HW100, servicing and modifying it.
>
> There has always been a problem with poor power output on the 10M
> band. I exhausted all the possible causes long ago and followed all
> the steps recommended. I even squeezed and expanded the add-on 10M
> tank coil that sets on top.  Nothing worked so I just gave up until
> now.
>
> I was working on the tank load capacitor which had gotten very tight
> over the years. The shaft is fine and so is the bearing, just hard to
> turn so I cleaned the thing with some CRC and then lubed it the best I
> could, short of the dreaded removing of the cage and tuning capacitor,
> and it has loosened up considerably. Enough for that.
>
> Then I happened to notice that the last 3 turns (part of the 10M band
> switching section) of the tank coil on my original coil, are wound at
> an angle slanted toward the rear of the rig, out of the coil form
> grooves  and unevenly spaced. I wonder if this is the root of my 10M
> tuning problem.
>
> I would greatly appreciate it if someone who has a final tank coil
> that they can look at, would check and compare it with my
> observations. This fine radio works as great as the day I built it in
> 1970 except for the low 10M output (about 50-60W).
>
> 73, Dick KF4NS
> St Petersburg, FL 33714 USA
> Keep The Glow!
>
>


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