[Heathkit] HALLISCRATCHERS BC939 CORRECTED

[rbethman]

Yes, but read further.

The BC-939 was ALSO intended to couple the output to what the TM 
referred to as a "long wire".  That is an instance when setup fixed. 
The wire lengths were 44ft, 77ft.

The infor mation is in the TM.  It does NOT appear on the cards that go 
in the steel pocket on the front of the BC-610/T-213.

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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