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MFJ259 ช็อต


Coaxial Resonators

Cavity filters, or more correctly coaxial resonators, are the cornerstone of good repeater performance. However, there appears to be some sort of black magic in the way they work or how they achieve their performance.

A coaxial resonator is much like a quarter wave stub but open-ended. It can also be likened to a quarter […]

ทำ Filer จากสาย Heliax

This filter is designed to remove interference caused by pager transmitters operating between 148MHz and 150MHz.

They are in effect cavity resonators constructed from LCF158 coaxial cable.

Specifications for this cable can be found here. This is some serious coaxial cable. It has a 50mm outer diameter and very low losses (0.82db/100m @ 150MHz). Both […]

ซ่อม MFJ-269

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