[Repeater-Builder] Re: Unidentified Micor Part

John - That part is actually the low-pass filter used on the output of the power amplifier to prevent harmonics from leaving the unit. It is a pretty good filter, with about 1 dB insertion loss up to 180 MHz, and 3 dB at 200 MHz. After that it falls off pretty fast. Here are my measurements

[Repeater-Builder] Mitrek problem

Recently I had a problem with a Mitrek radio, The RX channel element would not reliably start oscillating on power-up. In my experimenting, I discovered that the problem related to the power supply I used. I had four power sources - two linear supplies, one switcher, and a battery. One of

[Repeater-Builder] Re: 6m very heavy duty J pole for repeater use.

Your 6-meter J-Pole will be about 18' long for the active portion, plus some length for mounting. It will probably end up being the same length as the Diamond. The gain will be 2.6 dBi. A J-Pole is effectively a vertically-oriented dipole. John - WB4YJT

[Repeater-Builder] Motorola Service Monitor Extender cards

I have a limited number of Extender Cards for Motorola Service Monitors. These are the 72-pin cards (36x2) for the receiver and synthesizer modules (and maybe other modules in some units). I have constructed these myself, and they have gold-plated contacts on the socket, tinned contacts on the