An easily built project for interfacing with most transceivers

The Simple Simplex Repeater is a low-cost, easy-to-huild project that, when interfaced with a transceiver acts as a limited simplex repeater Unlike most repeaters, a simplex repeater operates on a single frequency by recording the incoming transmission and playing back this recording on the same frequency. Operators who would otherwise not he ahle to contact each other directly can use a simplex repeater operated by another party to communicate. The Simple Simplex Repeater is handy in these...

Miller Wide Band

If you intend to use this circuit as a mike preamp around high RF power, some RFI-proofing (limiting the RF end of the response curve with ferrite beads and RF bypass capacitors) would be well advised. Construction can be done on a perf board, keeping all leads as short as possible. The specifications and parts list are shown below, Usable frequency range AF from 50 Hz to RF over 100 MHz, with a gain of +35dB at 100 kHz, +30dB at 10 MHz, and +17dB at 100 MHz. The noise is...