Gene May wrote:
> 1. Does anyone know of a source for components or parts that could be used
> to make such a system? I am willing to consider taking it/them out of
> existing assemblies (e.g., military surplus) but would prefer assemble it
> from "basic" parts. I won't go so far as to say I'm desperate, but after
> considerable looking, I am very flexible and open-minded.
B&W made "plug in" P-P coil assemblies in 100 Watt and 1,000* Watt sizes, I
am looking for a set
of each each myself. The coil sets can all be plugged in and relay switched,
my plan.
100 Watts is the input coils, I plan on grid driven and input swamped.
> 2. It is necessary for the Q's of the tube circuit (probably to be around 10
> to 15) and antenna circuit (probably to be around 1) to be compatible with
> the range over which the coupling coefficient between the two coils could
> vary. As I understand, it is difficult to impossible to get coupling
> coefficients higher than about .3 using coils that would be compatible with
> the voltages and currents associated with an output of 1.5 KW. Comments,
> please?
The swinging link (or in the case of B&W a rotating link) adequately loads
the resonant circuit.
These coils did not have the third harmonic suppression (the second harmonic
distortion is canceled
out by the P-P circuit) that we need now so it should be followed by a low pass
filter for each band
and the swinging link should be made from coaxial cable, the ridged mw kind the
size of # 6 wire to
minimize the capacitive coupling. (Cross neutralization is required! And
Easy!)
I plan (5 or 6 projects down the road) on using a pair of 4-1000s or Russian
tubes class "B."
Another advantage of P-P is the absence for the need for a "plate choke."
The 100 Watt coils plug into a 5 pin tube socket (like the 807)
The 1,000 Watt size (frequently used with a pair of 813's) connector was a row
of (5 I think) male
banana plugs.
* not 1.5 kW OUT size, 1kW INPUT size!
--
Ron KA4INM - If you have any criticism for me constructive or otherwise
keep it to yourself, at my age I just don't care anymore.
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