[Elecraft] Dummy loads for dummies

[Walter Underwood]

For a 10W load, it is hard to beat the OHR kit. It is just two resistors on the back of a connector, but you probably couldn’t buy the three components for $11.50. The Craddock resistors are almost $10 each in small lots.

"The CQC RFL-10 Dummy Load Kit consists of two 5 Watt 100 Ohm metal oxide resistors connected in parallel, giving you a nice non-inductive 50 Ohm DC resistance.  We've field tested these babies and they produce a remarkably flat 1:1 SWR from 1.8 - 30 MHz. The main body of the RFL-10 is an S0-239 coaxial socket which allows you to create a nice in-line package. Two sturdy adapters are included, one that allows you to connect directly to an SO-239 coax connector, and another that allows you to connect to a BNC socket.  There are two solder connections, and that's it. 

When completed the RFL-10 will dissipate 10W  continuously, and up to 25W for brief periods."

http://www.ohr.com/rfl10.htm <http://www.ohr.com/rfl10.htm>

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Dec 27, 2016, at 12:21 PM, John Parker <johnj1jr at verizon.net> wrote:
> 
> The good non-inductive resistors are made by Caddock Electronics. Available from some of the catalog dealers.
> 
> John WB4UHC
> K3 #2165
> 
> 
> On Tuesday, December 27, 2016 2:46 PM, Walter Underwood <wunder at wunderwood.org> wrote:
> 
> 
> Ah, yes, bricks. Like these?
> 
> https://www.radioshack.com/products/radioshack-100-ohm-10w-10-wirewound-resistor-2-pack#  <https://www.radioshack.com/products/radioshack-100-ohm-10w-10-wirewound-resistor-2-pack#><https://www.radioshack.com/products/radioshack-100-ohm-10w-10-wirewound-resistor-2-pack# <https://www.radioshack.com/products/radioshack-100-ohm-10w-10-wirewound-resistor-2-pack#>>
> 
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/  <http://observer.wunderwood.org/>(my blog)
> 
> > On Dec 27, 2016, at 11:42 AM, Vic Rosenthal <k2vco.vic at gmail.com <mailto:k2vco.vic at gmail.com>> wrote:
> > 
> > They are undoubtedly wire-wound resistors and will have too much inductance to work well as a dummy load. The resistance is fine. If you have an SWR meter, check it with that. SWR below about 1.5 would mean it is usable. It might be OK on 160 or 80 meters but not on higher bands.
> > 
> > Vic 4X6GP
> > 
> >> On 27 Dec 2016, at 16:43, Paul C <paulc22 at sbcglobal.net <mailto:paulc22 at sbcglobal.net>> wrote:
> >> 
> >> I made my own dummy load last night from two 100 ohm resistors wired in parallel.  They are rated for 10 watts each and look like little bricks.  I measured the resistance at 51 ohms.  Do you think this is close enough or should I reduce it to 50?
> >> 
> >> Paul KG5KXG
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