SWR Testing of an Ameritron RCS-4 Coax Switch

[@GoodLuckBP]

Yes they upgraded the Unit, moving the transformer out to a wallwort. The Wallwort is 12VAC as it takes AC for this Unit to work. The concept of powering the unit via the coax has been around for a long time and CATV uses it to power their amplifiers. I purchased one of these and I had a nasty AC Hum on position 1. I disconnected the Antenna and measured 12VAC on the position 1 connector. The other three positions tested OK. I called Ameritron Tech support and Rob stated there is a problem with the Unit. He suggested I return it or fix it myself. I am tired of repairing MFJ products so I returned it and got another one. Same problem! I returned it for a refund. I like the idea, I just need one that works...Good Luck to you . Thanks for the video...

[@tampabayramon]

We just mounted this switch on a tower and used it on 6 meters. Works great. We get 1.5 SWR with an analyzer but we believe the antenna is the problem and will be fixed in the next few days.

[@DrewBrashler]

Haha! That is probably true! I will have to test that out sometime!

[@w2hx]

the SWR is increasing as you increase in frequency. why? because you are using a bnc "T" with your 50 ohm load. This creates a small stub that will have its own reactance. Try connecting your DL directly to the bnc port without a "T" and you might get better results in the higher frequencies. good luck

[@tampabayramon]

The manual says if turned off, it will default to coax 4. Maybe you didn't test it on coax 4 when switched off?