QSO with Western Sahara (S0S) on QO-100...

 Spyros SV8CS after 2:00 and me the last QSO....

 

QRADIOLINK transmission on UHF Ham band...

 

 Testing my ADALM-Pluto SDR on 70cm band. No bad at all...

QRADIOLINK it's great software.

                                             Tnx to SV5ADE Jimmy. 

 

 CQ WW CW 20m on my SDR server

Crowded 20m band. COVID-19 kepp ham radio CW operators close to radio.
 

Repairing A3S

 

Thanks to Chris SV5DDT, for the repairing. Cushcraft A3S getting older and the feed point was cuted. Changing jumpers, now is working just fine. There is some minor repairs needed and a good cable managment at next days.

Yet another 7 hams....!!!

 Great season for Dodecanese Radio Amateurs Association and the 100% success continue for my students. 

Thanks for effort and success guys. 

I'm proud of you...!!!

Testing NanoVNA V2...

This weekend I make some test with NanoVNA V2, testing some filters and antennas. The results are more than very good. The idea is to understand how thw network analyzer works and specialy how is calibrated. Assisted with software (due the small size of screen) I manage to make some profiles to HF amateur bands and also for VHF and UHF helping me later to make my tests. 

Im very exciting with this new toy...!!

 

DCI 4 pole 144-146 MHZ filter

YAESU FF-501DX HF passband filter

 

NanoVNA V2...

 50 KHz to 3 GHz
Vector Network Analyzer

The new toy it's here...!!! 

It's small, it's powerful and worth every cent. 

Stay tuned for more...

SDRs mods, update, improvements...

Many friends around the globe tell me that "will be very difficult to be done on Rhodes island due to very tiny components and special skills that needed for this work". 
Guys, the doctor it's in... And Im very happy that we have people like him on island. Mike Leventis he is an expert and first of all, a positive man. 
He suprised with my hobby and he tell me stories about him and his friends. He make the job TOTALLY FREE and this is something that I can't forget.

Thanks dear Mike. Im proud of you and impressed about your skills...!!!

 

HackRF mods and RF shield kit installation...

 RF shield on place...

 

 

 PLUTO SDR TCXO upgrade to 0.5 ppm and

ground modification.

 

Training new hams for exams....

New blood on SZ5RDS Club trained for next Ham Radio Exams. 

Ham Radio still interesting and alive in SV5land.
(photos by SV5FRU-Panos)

Power meter up to 2 watts...

RF-8000 is my new toy. Can measure up to 2 watts

(using the right attenuator) with limit frequency of 8 GHz.

Unique tool for QO-100 sat project.

MLA-30+ further tests...

Last weekend I make more tests on new antenna this time on SPY Server. All going well as you can see on pictures. MW sensetivity it's OK too.

"Small" things.....

If you need something that is not available in your area, and someone help you without any obligation that means you are lucky and reach guy.... Its not the first time that happens during my Ham Radio career someone help me... This time EA2AA Jose Maria Gomez-Salazar respond as pure Radio Amateur to my need. Thanks my friend, I'll never forget...

 

 

Small thing, Great guy.... 

Thanks Jose-Maria.

MLA-30+ Loop active HF antenna...

Finally it comes... Last night I make many test in HF spectrum.

I think this little antenna worthing every cent.

New SDR on the blog...

Surprise...!!!

 

Improved QO-100 again...

My new setup in my main QTH at Rhodes town....

There is lot things to improve....

Stay tuned...!!!

QO-100 setup upgrade ....

The new upconverter just arrived from Portugal. The power chain is more efficient now....

Im working from my 2nd QTH at South part of the island (KM36VC)

Here is the final setup....

IF radio on 432 MHz is my old friend Yaesu FT-847....

A huge pileup rise after few minutes. 72 QSOs in one hour.... Almost working in "contest mode"....

Stay tuned....in few days I'll make my setup in town of Rhodes (KM46CK)....

Part of my QSO's (credits to PE1LWT) here: https://youtu.be/AyS6tNVuE_s

SDR server upgrade....

AirSpy R2 added for 30 MHz to 2 GHz

AO-100 First ever SV5 QSO...

April 15, with the minimum rig setup.

Thanks Spyros SV8CS and SV5KJO George, for their help...!!!

Video here:. https://www.facebook.com/100006160840092/videos/pcb.595827581142916/2585681974980472/

SDR Family...

SDR family on SV5BYR's shack is grow-up. Lot of tests, lot of improvments....Stay tuned.

Remote SDR Server...

The idea....

The construction....

 The final result...

The heart of remote server beats on a Raspberry Pi 4, 4GB RAM running Spyserver software and powered  with POE (48v to 5V, 3A). Only one good quality FTP cable running to the roof giving LAN and power to the system. 

LNA pull weak signals out of noise, combined with a Diamond X-200 for VHF-UHF, and a Windom 160m-6m covering the frequencies from 500 KHz to 1,7 GHz. The server is not public and it used for personal experimental use only by me.

RTL-SDR and preamplifier work....

Here it's the first block. A mini RTL-SDR (R-820T) into the same metal box with an 20db preamplifier. The preamp is powered from the same USB.

 Here is the second combination.  An RTL-SDR into the metal box and the preamplifier above...

 Final setup. A blue thermal silicone it's under the RTL-SDR to spread the heat on metal box....