Welcome to

PE1RAH-SAT V2 (prototype II)


Here you can see the second prototype of my MODE-J satellite transponder design.

This satellite transponder is very small and belongs to the catogory of NANOSATs (<1kg)

The second prototype did work with lot of problems but finally this prototype is working as

I wanted and in short time I will start to make an final design of it.

This transponder can also be very interresting to carry by an little helium balloon or even with an kite-flyer.

It is basically designed to 'fly' as an satellite so it can be accessable to all amateurs of the world.


Below you can see another picture of it and the size compared with an music casset box:



Some more detailed picture:


Right below: 2m GaAs FET RX amplifier.

Right middle: Double balanced mixer.

Right top: First LO (VHF)

Middle below: Second LO (UHF)

Middle top: IF filter + mixer.

Left top: 70cm filter.

Left below: 70cm 1W PA module

The total size is 6cm x 4cm x 1cm.


The idea is to put this transponder together with 5 rechargable penlite batteries into an metal box with the size of an

music cassete box. The total satellite size would be te size of an music casset box !!!




This prototype is an lineair MODE-J transponder. (ALL MODE 150 kHz bandwith.)

TX: 435.175 MHz - 435.325 MHz. USB

RX: 145.975 MHz - 145.825 MHz. LSB


Let's hope I will find some lift into space at the end, I will go for it !!!

When you know something, please tell me [email protected]


This page is very new, and the main goal for me is to give technical information, so don't look at my English.

This page is designed and created by PE1RAH. (William Leijenaar).