10 GHz feedhorn with scalar ring, Chapparall Feed.
In order to get back on 10 GHz EME I needed a feedhorn for my 0.25 F/D dish. Not easy to find! Paul W1GHZ paper […]
> 1000 MHz
ON4CDU, GPS frequency standard & much more
On his webpage Hans published his GPS receiver already a long time ago. It can be found HERE As an extra Hans put in the […]
Chinese attenuators (ebay)
I needed some SMA attenuators for my SWR-Wattmeter project. I found the available for abt $7 (2016) on Ebay. These are available in 6, 10, […]
Gysel couplers
The Gysel coupler (under construction) There are many ways in combining amplifiers. Wilkinson dividers, hybrid couplers or rat-race couplers are the best known couplers […]
YL1050 1296 MHz amplifier DL9EBL design
A YL1050 amplifier designed by Karl Schötz, DL9EBL. Karl handed me a floppy with the drawings of his amplifier. I printed them and these are […]
Conversion to 1296 MHz for the DF1SR circulator
In need for a number of circulator / Isolators for my new 23 cm solid state PA, I got some circulators from Georg DF1SR. These […]
DF1SR hybrid pics and test
If you are looking to combine several amplifiers on 1296, you might be looking for a hybrid coupler. Making one of those is a big […]
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 […]
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 […]
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 […]