> "kq7dx" <kq...@...> wrote: > Dear Group, Stop calling me Dear... people will get nervous
> Somewhere I saw or heard of a inline coaxial impedance > matcher. It looks like a barrel connector but it actually > has an adjustment on it for adjusting or trimming SWR > between devices. It is placed inline with the coax ,between > a driver and amp or between duplexer cavites etc, and > adjusted for 50 ohms in instances where the coax length > is not optimum. I thought Digikey made them but cant > find it. If anyone knows about these and where to get > them let me know.. > 73 What the impedance matcher looks like and how it works is based on the frequency/band of operation and where it will be placed. The small or barrel type I remember were mostly made for the high end of the HF Bands. You can call the "impedance matcher" a number of different names like "Z-Match" or "Antenna Tuner". The type of Z-Matcher most of the people on this group are probably thinking about was popularized by the GE Land Mobile (two-way) Radio folks, mostly for use with their repeater and base station equipment. And there is a web page with that information if you felt inclined to build something similar. http://w4zt.com/zmatch/ Companies like Telewave and TX/RX who make duplexers and cavities also sell similar "matcher" products. And we have seen them pop up on Ebay from time to time. s.
