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 […]
100 – 1000 MHz
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 […]
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 […]
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 […]
