[Heathkit] HALLISCRATCHERS BC939

[rbethman]

Yes, but read further.

The BC-(#( was ALSO intended to couple the output to what the TM 
referred to as a "long wire".  TThat is an instance when setup fixed.  
The wire lengths were 44ft, 77ft.

This wire was connected in lieu of the whip.

Bob - N0DGN

On 2/26/2010 10:49 AM, mrapps at grandrapids-mn.com wrote:
> The BC939 was intended to match a 35 foot whip to the BC610 from 2 to 18
> mc.  Considering the losses in the 5 turn input link, any antenna could
> look matched.
>
> HW-12s had fixed output cap.  Pretty much 50 ohms only.
>
> Have fun
>
> KoDCF / Tony
>
>
>
> As Glen has posted, the "era" of SB-102s, HW-101s, and for that matter
> The HW-12s and others did very well loading with their Pi-networks.
>
> I only had to go to an external tuner to demonstrate that I could load a
> bedspring and talk from my wife's sisters house with a piece of enameled
> wire.
>
> The current solid state equipment either requires one due to the
> "foldback circuitry" to deal with the SWR that is exhibited when you get
> out of the "sweet spot" that a doublet is cut for.
>
> Then again, the BC-610s and other "tall ships" on AM,, sometimes require
> one.  I have the BC-939 for the two BC-610s.  However, you also have to
> keep in mind that the BC-939s are NOT antenna tuners.  They are antenna
> COUPLERS.  There is a big difference!  There is NOTHING that is even
> remotely close to a 50 to 75 ohm output impedance from a BC-939.
>
> I can't remember whether I used a homebrew tuner or something that was
> purchased to load those bed springs with that single wire.
>
> Bob - N0DGN
>
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