On 08/11/13 07:52, Jim Thomson wrote:
I built a dummy load consisting of 4 x 200 ohm globars in parallel. Each
resistor is 12 inches long x 1 inch OD.
Each resistor resides in its own 3 inch OD x 12 inch long AL pipe. All 4 x AL
pipes are heliarc welded together.
The entire mess will sit in a 7 gal new paint can. A 5 gal can + top part of
a 2nd can were brazed together.
A 7-16 DIN was installed dead center in the top lid....along with a pressure
relief tube, off to one side.
Instead of xfmr oil, can distilled water be used instead ?? It will only
be used on 160-10m..and maybe 6m.
If something goes terribly wrong, Id rather have water all over the basement
floor vs oil. Distilled water is
an insulator. Heck, Bird + CD have water loads that use tap water. AG6K
depicts a hb water load...with a
single 500W resistor inside some pvc tube and a garden hose fitting on one
end....and coax connector on the
other end.
I realize water boils at 212 F. Has anybody tried distilled water in a 1 gal
dummy load ? Is it still 50 ohms ?
I don't need any more station test loads, but if I did would
investigate mounting the non-inductive resistors that can be had in
TO-220 cases (two leads) as four 200 Ohms in parallel (for 50 Ohms) on
the flat back of a heat sink then four sets in series parallel arraigned
in a square so one large muffin fan could carry off the heat from all of
them. These resistors can be had in various power dissipations.
--
Ron KA4INM - Youvan's corollary:
Every action results in unwanted side effects.
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|