Heising Choke

[Marshall]

I built a 160 meter mobile transmitter that used Heising modulation back in the
late 50's or early 60's.  Seems like it was a Handbook or maybe a QST project.
It used a 6AQ5 final amplifier and a 6AQ5 modulator tube.  I believe the
Heising choke was nothing more than a common speaker transformer that had a
8 or 10,000 ohm center tapped primary.  The secondary was not used - just the
primary.  Several of us around Flint, Pontiac and Detroit, Mich. built these and
they seemed to work fairly well, despite the lower power.

Marshall M. Dues - WB5MYO
Katy, Texas


carl seyresdahl wrote:
> I can't believe there is anyone still alive who remembers what "heising
> modulation " is !!!!!(except me, that is )
>   carl / kz5ca
> ----- Original Message -----
> From: "James Tolar" <w5sqe at iname.com>
> To:..... <heath at listserv.tempe.gov>
> Sent: Tuesday, September 17, 2002 2:54 PM
> Subject: [Amps] Heising Choke
>
>
>
>>Need a 50hy @ 0.5A heising choke to use in an AM rig modulator I am
>
> building.
>
>>--

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