5 pole Cauer filters for the HF bands
To build a solid state amplifier today, one has the availability of many fets. Preferably Ldmos as this is the most sturdy and the most […]
0 – 100 MHz
Wide band solid state amplifier for 50 & 144 MHz
This design is based on the Motorola (now Freescale) application note AR305. Instead of using the Motorola FET I used the Philips Gemini FET BLF278 […]
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 […]
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 […]
50MHz Wilkinson divider
To loose some drive power on 50MHz I made a Wilkinson divider. This splits the power in two ports. In my case one port was […]
50 MHz Low Pass Filter Cauer
The filter was build in a tin box 160x100x50mm. All inductors are wound on a 20mm dia. Wire thickness is 2mm copper wire. Capacitors are […]
Muiltiple antenna outputs and a RX antenna for the Icom IC-7300 the Yaesu FTDX-10 and many other transceivers.
When looking for a new transceiver from HF up 50 & 70 MHz I was disappointed by the antenna outputs, just ONE, better ONLY ONE. […]