Radio W4KAZ

Thanks for stopping by the virtual KazShack. Feel free to comment - I often approve them.

Remote Antenna Switches

A little look at some interesting remote switch projects.

Far Circuits has the KO4NR project from QST, April 05antenna switch project. It is the circuit board and a full set of the required Zettler relays(az755-1c-12DE). A six position remote switch for only $36 plus shipping. Not bad. It is listed under “Repeater, Controller, and Station Accessories”.

Also KK1L has a 2×6 switch project posted on his site. It uses the same Zettler relay as the KO2NR project. A quick look at the data sheet shows that the P&B relay RTE24012F or RT424012 has a pin layout similar enough to be substituted for the Zettler. The Zettler has a 20A rating(both poles) while the P&B is rated at 16A. Pricing is similar, and the 16A P&B is in wide use in full power stations. Boards are not currently available from KK1L, but he has the full schematics posted. Â Here is an analysis of the switch by AC0C.

Lacking PCB etching supplies and skills, it might be possible to produce a usable board for the Ko4NR project using a dremel tool. My own home brew switch was constructed dead bug style. It shows losses on 15m and 10m. I have a couple more antenna problems begging to besolved with 2 or 3 position remote switches. I think I’ll take a swat at connecting the so239 jacks via home brewed stripline. Â Here’s an online stripline calculator.

KK1L also has a nice SO2R home brew project.


Continue reading Remote Antenna Switches