Welcome to PE1RAH    “LE002 - Linear Transponder System”

 

LE002 Transponder Unit

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 terrestrial use in mountain areas.
Unfortunately 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 similar
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 mounted 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.

LE002 Transponder. Top View.

 

The RF input and output ports have standard SMA connectors.

A 15-pole SUB-D connector is used for power supply and extra optional features like frequency programming, CW beacon, Telemetry input, IF in/out

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)
 

Block circuit of the linear transponder

 

Aluminium milled box sizes.

The birth of a Transponder

To come:
LE002 version 2 : Uplink 70cm and Downlink 10m

73 de PE1RAH (William Leijenaar).

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