High Power couplers
On this page there are some high power couplers presented with fair directivity. These couplers cover a rather wide frequency span from 144 up to […]
RF construction
45 MHz High Pass Filter
To protect my 50 & 70 MHz transceiver against high RF from the HF station, the antennas are only separated 1 meter apart I designed […]
Power spike / Overshoot on transmit for Yaesu FT-736 & FT-790 and Kenwood TR-9000
In order to solve some problems with solid state amplifiers, my friend Jack PE1KXH measured the power spike of some transceivers. The first exercise was […]
PG103 Preamp with filter for 144 MHz.
Leo ON6LEO needed a preamp as a second stage. I needed a preamp for 432 MHz and also one as a broadband measurement preamp. The […]
10MHz & 432MHZ Diplexer
I was in need for a 10 MHz and 432 MHz diplexer. Low power in order to feed a 10MHz signal on the same coax […]
432MHz filter from Ali Express
I needed a low pass filter for 432MHz and as usual Ali Express has a solution not to expensive. These were 400-470 MHz low pass […]