[Boatanchors] Crystal sets - and paper coil forms

[Al Klase]

Bill, et al,

Larger diameter has a definite positive effect on Q. See my brain dump: 
http://www.skywaves.ar88.net/Coils/Coilwiz.html

Unless I was seeking the vintage look, I'd use 4" ABS (PVC, second 
choice) pipe couplings from the home store.

I've always avoided sliders. If the slider bridges adjacent wires, it 
creates a shorted turn that is disasterous for Q. It was probably OK in 
the days of spark where the signals were really broad.

Al

Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 8/1/2014 8:55 AM, Bill Cromwell wrote:
> ........Has anybody else used those large-bore paper tubes or other 
> 'large' diameter forms in that role? As for the tubeless toilet paper, 
> they are making it cheaper, lower performance (try getting that thing 
> on the 'dispenser') but are they lowering the price? Besides use as 
> coil forms they are convenient for stuffing with dryer lint and then 
> lit as tinder under your camp fires. Boycott, anyone? <evil grin>
>
> 73,
>
> Bill KU8H
>
>
> On 08/01/2014 07:31 AM, Jim Wilhite wrote:
>> If one plans to do this later they should start saving the tubes from 
>> toilet paper. I notice an ad earlier this week for TP that doesn't 
>> have the tube.
>>
>> Jim
>> W5JO
>>
>> -----Original Message-----
>>
>> I shellacked a toilet paper tube three times, I close wound enameled 
>> wire on it and marked it
>> with the slider then I sanded the enamel off where the mark was.
>
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