01 February 2012

Mighty Fine Junk hack

So I went by H.R.O. today and picked up an inexpensive MFJ duplexer  diplexer. It is designed to split 2M and 70cm, but will work to split any high band VHF from UHF 430 to 520.

The first thing I did was pull it apart. At $24 it's the cheapest diplexer I have found, so I figure it can't be too hard to DIY.

Inside you have what you would expect to find, a series of inductor coils and caps. The VHF side uses a 100nF cap the UHF side 47nF. Unfortunately my Fluke doesn't do mH so I'll have to measure the inductors some other time.

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