This kit was originally developed for the 2016 BuildAthon at
FDIM,? details on the QRP me website.
Based on my 4-port coupler, included in the KotMC and the W7EL Power
Meter electronics (with permission) a kit was produced.? For one
application, I'd incorporated the coupler into an ATU with dual meters to
show Fwd and Ref voltages.
?
The BuildAthon kit was further revised and updated and became the
Directional Power Meter kit.
?? The BNC
connectors, not supplied, were attached for tests and
measurements.
For details, check the manual from the QRPme.com web pages.?
As well as 3 ranges of QRP power, the meter Fwd and Rev voltages can be
used to measure/calculate VSWR using an equation like this:
For my own amazement, I wrote a simple program in Small Basic to do that
calculation.? Those of you with real programming skills might
develop something that would calculate, change power levels , and display
the results and other automation capability.
This was a fun project and the results were well worth the
effort.
Note: since the project was finished sep 2018, I've used the recently
obtained NanoVNA to check it out over a wide range of frequency -- looks
good!
Chuck, W5USJ (ex K2OFN)
ARCI 5422, SKCC 19956
EM22cv, Rains Co., Texas
--
Chuck, W5USJ
