Richard Clark wrote:
On Sun, 20 Jan 2008 12:29:19 -0500, "Bob"
wrote:


"Cecil Moore" wrote in message
.. .

Tam wrote:

Almost certainly, the power rating of the terminator is either 1/8, 1/4,
or 1/2 W.

Does Radio Shack not specify the power rating?
--
73, Cecil http://www.w5dxp.com

Hey engineer! here is link:
http://www.caddock.com/Online_catalo...e/Current.html
MP9100
Dont lure good people to smacks shops! Just DIY!


Unlikely to be useful above the LW to AM band.

73's
Richard Clark, KB7QHC

Actually, those Caddock MP9 and MP8 non-inductive resistors are good to
HF (allowing for the physical size). The inductance of the big ones
(MP9100, 100W units) is about 20nH, about 3 ohms at 28 MHz. Half that
for the smaller ones. The challenge is in getting the heat away from
them. the thermal resistance of the MP9100 is 1.5 degrees/W, so at
100W, the resistor is 150 degrees hotter than the heatsink, and with a
max temp of 175C, you'd better keep that heatsink at 25C.