Celebrating successful Es’hail 2 / QO-100 GEO HAM satellite WSPR transmission using only 4 milliwatts

Posted on 08/23/201908/23/2019 by Zoltan

Setup:– QRP Labs U3S kit at 2m mode WSPR, using GPS calibration– 2m BPF– Morfeus converter – a Minicircuits ZX60-43-S+ RF amplifier block (single stage) – 2.4 GHz BPF– 5 turn LHCP helical and 1m parabolic dish– Virtual Audio Cable SW tool for routing web sdr audio to WSJT-X– WSJT-X windows decoder program– UK WEB Read more about Celebrating successful Es’hail 2 / QO-100 GEO HAM satellite WSPR transmission using only 4 milliwatts[…]

Es’hail 2 / Qatar-OSCAR 100 bare LNB vs Parabolic dish reception test

Posted on 02/21/201902/21/2019 by Zoltan

Have seen an example of “bare LNB” reception of QO-100 GEO ham satellite from Andreas Preuss, DL5APR. That was quite shocking… So tried to reproduce that experiment using my own receiver setup. Looks like its works fine for stronger signals! I can imagine adding some tricks to the LNB’s horn antenna to improve it’s gain Read more about Es’hail 2 / Qatar-OSCAR 100 bare LNB vs Parabolic dish reception test[…]

Es’hail-2 narrow band transponder live streaming

Posted on 01/17/201902/13/2019 by Zoltan

The new GEO stationary ham satellite transponder is it’s in final phase of testing. Now the narrow band channel is actively tested with noise. Some strange CW transmissions occurs too which is not clear if part of the testing or pirate events, from the Amsat-DL forum: https://forum.amsat-dl.org/index.php?thread/81-es2hail-beacon-is-alive/&postID=1148#post1148 Here is the recorded CW transmission: Here is Read more about Es’hail-2 narrow band transponder live streaming[…]

20M QRPi (WSPR-Pi) Schematic

Posted on 01/09/2019 by Zoltan

As indicated by ham users the schematic is low quality in the PDF article released by TAPR. Here sharing a better quality picture, hopefully that helps.

Making a standalone WSPR receiver using Raspberry Pi and RTL-SDR V3 dongle with rtlsdr-wsprd software

Posted on 12/21/201812/21/2018 by Zoltan

Here is list of commands how to install and configure a standalone wspr receiver on Raspberry Pi using an RTL-SDR V3 dongle for wspr reception and reporting. Running this since a year on the roof with great success! Can be run in RPi 1-2-3 even zero.

INMARSAT STD-C EGC live streaming

Posted on 12/14/201812/21/2018 by Zoltan

You will find more details for decoding in this article: This is an educational purpose audio stream. You can use this audio stream to experiment with narrow band satellite reception without physical ground station (SDR, LNA and antenna hardware) having fun and learning SDR technologies without experience (and investment) in RF Hardware. Simply open in Read more about INMARSAT STD-C EGC live streaming[…]

RPITX V2 measurement plots

Posted on 11/25/201811/25/2018 by Zoltan

Hi, As may many of you seen on RTL-SDR blog the RPITX V2 is out there We made several measurements booth on 434 MHz and 144 MHz and looks like the first still has difficulties while the second (144 MHz) is exceptionally clean, even with PA (1W) and almost no filtering. 434 MHz strange spuriouses Read more about RPITX V2 measurement plots[…]