Parasitic Suppressor

Keith Rowland k4kgw at MINDSPRING.COM
Tue Dec 9 14:17:34 EST 1997


Rod:  The plate parasitic suppressor is most often wound on a 50-ohm
resistor, but I suspect you could use any of those that you have.  I
would choose the 100-ohm unit to start with.  The grid resistor doesn't
have to be 2-watts, but if you want to use one of the ones you have,
I'll bet any of them would do.  Try it and check for parasitics.  There
are places you can get 2-watt jobs, but I can't recall where at the
moment.  I would try Mouser and Tech America for starters.

73, Keith

Roderick M. Fitz-Randolph wrote:
>
> I am in the process of building a VT-4-C (211) Hartley Oscillator
> transmitter and have only a few 2 watt composition resistors with
> which to build a parasitic suppressor for the plate.  They are:
>
>    1 ea.  10 ohm 2 watt composition
>    2 ea.  15 ohm 2 watt composition
>    1 ea. 100 ohm 2 watt composition
>    1 ea. 150 ohm 2 watt composition
>
> Since I don't have the foggiest idea where I can get any others,
> I am asking those of you that are knowledgeable about such things,
> which of these might make the best resistor around which to wind
> a coil for parasitic suppression on an 80 meter Hartley?
>
> Also, would like to insert, close to the grid pin on the socket,
> another resistor to act as a parasitic suppressor.  Which of those
> I have available would accomplish this?
>
> My purpose is to make a vintage 211 Hartley Oscillator transmitter
> on an oak bread board and make it as close to the original open
> breadboard design as I can and yet still have something that won't
> tear up everyone's TV set.
>
> Any help will be appreciated.
>
> Rod, N5HV
> w5hvv at aeneas.net
>
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