Hybrids for 1296 MHz using Taconic PTFE material
Having the intention to phase up a number of smaller PA’s for 1296 MHz the need existed to produce some hybrids for 23cm using PTFE […]
RF construction
PCB low pass filters
In a discussion I had with Peter, SM2CEW and Graham, F5VHX, the idea grew to make simple low pass filters. Simple but suitable for fairly […]
2 x GS35 PA for 144 MHz
Here follows a photo description of a 2 x GS35 PA for 144 MHz. Beware this is not a fully tested design! There are no […]
Hybrids for 1296 MHz using FR4 material
These hybrids use normal FR4 board. The design published here are on the ‘normal’ FR board. Differences in the board material might effect the results […]
144 MHz Bandpass filter
A 2 stage 2M bandpass filter using helical s. Note there is a new article about this filter with more information click HERE On my […]
Preamplifier with a MGF1801 for 144 MHz
A modification / combination of the DJ9BV & I5TDJ 144 MHz preamp designs The original I5TDJ design used a rather long coaxial input design. This […]
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 […]
GS35 amplifier for 144 MHz
A GS35 amp fore 144 MHz. I once got a hand made drawing of this amplifier. It originates from ex UV1AS, RX1AS (thanks RW1AW for […]
GS35 amplifier for 432 MHz
A GS35 amp fore 432 MHz, one of many designs. This design is well proven and simple to copy. The output of this amp will […]
High Power Low Pass filters
Presented here are some high power low pass filters for 144 and for 432 MHz. These filters are coaxial step impedance filters and can take […]