Here is a piece of home made gear I use all the time. It is a self contained

dummy load with a built in watt meter and calibrated sample port.

A automatic fan allows continous operation up to 250watts.  The capacitance

of the load resistor limits the upper frequency range to about 500mhz.

The load resistor is a large surface mount type with a 800watt rating although

the small heatsink in this project limits operation to short excursions to this power

level. The sample port was created by drilling and tapping a 3/8 -32 hole in a Bird

43 directional coupler. A small brass disc was soldered to the center pin of a BNC

( Bayonet Neill- Concelman) female chassis connector. The connector is then screwed

into the hole in the coupler where the small disc couples RF from the center conductor.

The BNC connector is screwed in or out to adjust the coupling ratio. Most of the parts

came from hamfest swap tables except for the power resistor which is a Anaren RFP-800-50T.

 

 

This high power water cooled dummy load is used to test 1kw plus loads for

extended times. I came across an Alltronic coaxial water cooled load at a hamfest

for $25. The Litron heat exchanger came from ebay for about $75 and the flow switch

also from ebay for $15. I put it all together for about $150.00. Now I have a legal limit

continuous duty test load that works from 160m-23cm.