[Elecraft] Dummy load for Part III
Ron D'Eau Claire
[email protected]
Thu Nov 7 14:01:00 2002
Andrey, it sounds like a dummy load I built many years ago using 2 watt
'composition' resistors (not made any longer) for my Viking Ranger.
Worked FB. Your choice of metal film is the key here from what I
understand.
The "proof" is easy to test. Check the VSWR of your dummy load. If it's
reasonably low up through the highest frequency you want to use, you're
in business. For the K2 that means 1.5:1 or better is fine. Maybe even
2:1 although that's the limit of the acceptable SWR range without
matching if I recall correctly.
For ops looking for a pre-built dummy load, Radio Shack does make a
nifty little factory-built dummy load. I bought one 15 years ago to use
checking VHF radios on ships. It's round, about 1.5 inch in diameter
(mostly black cooling fins) and about 2.5 inches long with a male SO-239
coax connector built in one end. It's rated for 15 watts and will handle
that easily for longer than one should hold the key down on the K2 at
that power level. The stores don't carry them any longer, but I know a
fellow who bought one on-line from Radio Shack not too long ago. They're
about US $20.
Ron AC7AC
K2 # 1289
-----Original Message-----
Andrey wrote:
I am done with my dummy load :-)
I used male BNC to female PL-259 convertor to attach a PL-259
T-connector (male with 2 female conectors) to the K2. The dummy load is
build from the T-Connector, using 20 pieces of 1/2 W 1kOm Resistors.
First i bended one of the leads of each resistor at 90 degerees, close
to the body of the resistor, then i used 10 resistors and aranged them
with all of the bended leads together in a star-shaped pattern (the
bended leads were in the center and the straight leads were pointing
away, it looked almost like a flower).