THE TEST ATUs
BALANCED ATUs
TEN-TEC MODEL 238-B "L-NETWORK" ATU
This ATU is rated 2kW, and will match just about anything.
More info and user manual:
The MFJ-901 is one of MFJ's very first ATU's. It is a simple L-Network that also included a built-in 4:1 Voltage Balun. DO NOT USE THIS BALUN.
Instead, use the external 1:1 Current Balun as I describe elsewhere in this section.
UN BALANCED ATUs
ANNEKE SYMMETRIKAL KOPPLER
This is the 200 Watt version of the Annecke Symmetrical Coupler, which is a modified version of the Johnson Viking (275 W.) matchbox.
Details: https://www.dj0ip.de/antenna-matchboxes/a-n-n-e-c-k-e/symmetrical-koppler/
The
MFJ-974-B is a
Balanced-T ATU, rated 150 Watts. It matches 12 to 2k Ohms.
I have owned a couple of these over the past 20 years and they matched many different antennas.
DECCA KW EZEE Match (Zed Match).
This was a very popular ATU in the U.K. I have owned a couple of these and used them to match all sorts of balanced antennas . . . before I was aware of the Annecke ATU's.