Hello friends
I got this junk amplifier !
I’m Looking for any information or data sheet .
Thanks in advance
73’s
What the specifications of this PA
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St2nh Nader have a look at this page.. It seems that is what you have on the photos:
https://uhf-satcom.com/misc/inmarsat-amplifier
I hope this helps you..
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Good catch Heiner, yes that seems to be the same type of amplfier.
Nadher, it will be certainly not easy to retune those amplifiers from 1.55 GHz to 2.4 GHz. I think you will have to change a lot and I am not sure whether the transistors are internally matched ...
Kind regards
Matthias
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Thanks DD0KP Heiner & DD1US Mattias.
Other question!!
I got EDUP mode EP-AB003 wifi amp.
Since out of the box ,It’s never got hot or improve my signal ?!!!
I did some modifications to increase the power . Fixi a jumper as in the photo...
The result is only heat but no improvement in power !!
Pin 4&5 jointed in permanent tx mode.
Current constant during tx or rx mode.
Any advice or it’s a dead amp??
Vy 73
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Hello Nader St2nh
Welcome in this forum, we were also in the same YAHOO group EU_AMSAT many years ago. This group is unused since many years now.
I also ordered this booster and I hope now, it's working then. Where do you ordered yours, from China ? We had many discussions in this forum about it and we came to the conclusion that a modification is not necessary. The gain is about 10 ... 12 dB, maximum input 500mW.
73
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St2nh Nader look in the Twitter chat from David G0MRF dated March 11th:
David is a good address to help you.. His email is in qrz.com..
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St2nh Nader.. this can also help you:
https://www.george-smart.co.uk/2019/03/limesdr-edup-pa/
It is M1GEO..
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Hello Nader,
I've found something about the EP-AB003 here:
http://www.ra3apw.ru/qo-100/qo-100-stc7031_appn2/
It's in Russian. So google translate is probably necessary. You can see in the table what the current should be when driven by 80-100mW input.
Good success, regards Mike
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St2nh Hi Nader.
Firstly, thank you for all your reports and data over the years for the FUNcube series of satellites.
The AB003 amplifier should show an increase in supply current when you apply drive.
If you have shorted pins 4+5 the transmit / receive LED should be permanently in transmit mode.
For full output you should need about 170mW input RF input. What is the DC supply current with no drive?
73 David