Welcome to PE1RAH
“LE002 - Linear Transponder System”
After the launch of my transponder on the India HAMSAT
satellite I got many questions from amateurs all around the world if I have a
transponder design for their project to build. These projects were not only
satellites but also balloon missions and also for terresterial use in mountain
areas.
Unfortunatly it is not easy to build a linear
transponder without the proper tools, what makes it the reason that there are more
FM transponder experiments than linear transponders. Another problem with
linear transponders is that they are relative expensive to make especially when
larger bandwidths are wanted. I have tried to find a way to get linear
transponders more popular and I think the best way is to make it easy available
for amateurs that have not the tools, money and time to develop their own
transponder.
The LE002 is a Linear Transponder System that has a technical
similair construction as the Dutch transponder on the Indian HAMSAT. The LE002
is constructed in a more professional way and improved to be used for different
kinds of experiments.
The transponder is made in a milled aluminium box. The
box is milled in such a way that the transponder can be easily mount on any
flat surface, without the need to open the box itself. Some more features and
pictures below:
The RF input and output have standard SMA connectors.
15-pol SUBD is used for power supply and extra optional
features like frequency programming, CW beacon, Telemetry input, IF in/out
Inside view of the transponder.
Block circuit of the linear transponder
Aluminium milled box sizes.
More features:
Power supply : 9Vdc to 14Vdc
Uplink (LE002 version 1) : 430…440MHz (Frequency
is programmable by PLL in steps of 50kHz)
Downlink (LE002 version 1) : 144…146MHz (Frequency is
programmable by PLL in steps of 25kHz) C
Bandwidth : 30kHz (Sharp crystal filter) , 15kHz and
3kHz are possible on request.
Output power: +20dBm (100mW) PEP (output spectrum is inverted from input
spectrum)
Weight: 550 grams
Optional: CW beacon, IF in/output (for external
beacon, telemetry, or connection with other transponder)
To come:
LE002 version 2 : Uplink 70cm and Downlink 10m
73 de PE1RAH (William Leijenaar).