|[AMRadio] Re: Need list of good AM radios to start lookingfor
jpl15 at panix.com
Wed Nov 16 16:21:41 EST 2005
On Wed, 16 Nov 2005, John E. Coleman (ARS WA5BXO) wrote:
> The best way is still to reduce the supply voltage at the
> plate/screen modulation point. A large resistor that has a bypass cap
> across it works well.
As has been wisely pointed out to me - in the case of the Ranger,
placing a suitable variable resistance in the plate line will accomplish
this handily, it seems - unless I'm missing something very obvious.
These wires are conveniently brought out to pins 2 and 6 on the rear
octal plug, with 6 being the line from the supply to the mod trans
secondary, and 2 being the 'start' of the secondary. The 'finish' goes to
pin 3, and the line to the final plate goes to pin 5. These are jumpered
in the mating plug.
I'd be inclined to reduce the voltage before the mod trans - thus
reducing the DC saturation a bit. But that's probably Nit #68 in the
grand scheme of things...
PS: I'm going to try this, perhaps this weekend if I can get a spare
hour of bench-time on it.
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