Extending the defined ranges of SatNOGS UFH antennas -- including the 400 Mhz range

Hi all,

There are currently only 44 SatNOGS ground stations (antenna) worldwide that are defined as being able to receive the 400-401 MHz range.

Putting this out there, after months of observations using my two Yagi antennas that are designed for ~435 MHz (One is an Arrow II Alaskan series Yagi with a DownEast LNA rated for 420-450 MHz) it become apparent that they are quite capable of receiving signals and decoding valid frames from satellite in this low 400 MHz range as well.

So if your looking to extend your reach to UHF satellites (of which there are dozens) in the 400 MHz range, then you could simply revise the frequency definition of your ground station(s) antenna to be that of 400-470 MHz (or similar) rather than the more typical 430-470 MHz.

Some recent examples from my two ground stations for 400 Mhz range

5064820 SOAR 401.725 MHz

5060170 NOUR 01 401.500 MHz

4993520 Jin Zijing 401.350 MHz

5031178 PIXL-1 400.575

5031050 ChallangeOne 401.575 MHz

5019443 HIBER-3 401.300 MHz

5002501 LEMUR 2 FURIAUS 402.700 MHz

4996477 GOMX4-A 400.800 MHz

4996309 ET-SMART-RS401.950 MHz

4996263 LINGQUE 1A 401.800 MHz

It would be great if we could more coverage of the 400 MHz range with existing UHF antenna.

Good/bad idea? Thoughts, comments?

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Good point. I will test my current UHF antennas in this area.

3 Likes

3CAT-5/A||46292|401.337|FM|FSK G3RUH 9K6|
3CAT-5/B||46293|401.377|FM|FSK G3RUH 9K6|
BRO-4 49066 401.735 FM FSK AX.100 Mode 5 9K6
CUBEL 47448 400.575 MSK AX.100 Mode 5 9K6
DIAMOND BLUE||42786|401.150|FM|1KUNS-PF 9K6|
DIAMOND GREEN||42785|401.150|FM|1KUNS-PF 9K6|
DIAMOND RED||42783|401.150|FM|1KUNS-PF 9K6|
DIDO-3||46284|400.450|USB|BPSK G3RUH 1200bd/2400bd|
DIDO-2||42000|400.300|USB|BPSK G3RUH 1200bd|
ELO ALPHA (TYVAK-182A) 48271 401.760 FM FSK G3RUH 9K6
GHALIB 48962 401.175 USB BPSK G3RUH 1K2
GOMX4-A||43197|400.800|FM|1KUNS-PF 9K6|
GOMX4-B||43196|400.800|FM|1KUNS-PF 9K6|
KEPLER-2 (TARS) 46319 400.800 FM 9K6
LINGQUE-1A 43942 401.800 1KUNS-PF 9K6
NAPA-2 99671 401.124 USB BPSK 1K2
NOUR-01 45529 401.500 FM FSK 9K6
SIMBA 46279 401.175 FM BPSK G3RUH 1200bd/2400bd|
SOAR 48851 401.725 FM FSK AX.100 Mode 5 9K6
TYVAK-0130 48606 400.781 FM FSK 9K6
TYVAK-0171|EG-2|46295|401.200|FM|FSK 9K6|
TYVAK-0172|EG-1|46267|401.200|FM|FSK 9K6|

Vy73!!!
Janusz SP7THR

2 Likes

And don’t forget

CuPID 99511 400.500 GFSK 38400.

The folks at Boston University are still hopeful for contact since the launch in October. So if you’re in the middle/east part of USA/Canada and can lend an ear for CuPID, it would be much appreciated. No beacon but should tx when passing within range of Boston University’s ground station.

2 Likes

Just a point to watch out for: if you have an omnidirectional antenna and receive regular ‘chirrups’ of data that last for about 2 - 3 hours then disappear, you may just have received a weather balloon passing by. In and around Europe they use the 400 - 406 MHz range as well, which when rising slowly from ground level to 30km and falling quickly back down again can easily be received well over 100km away, even accidentally :roll_eyes:

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If you are interested in tracking weather balloons, check out the Project Horus radiosonde software on GitHub: https://github.com/projecthorus/radiosonde_auto_rx

Since July 2020, I’ve used the software running on a dedicated Raspberry Pi with a RTL-SDR to track weather balloons launched daily from the NOAA station in San Diego, CA, US and the US Army’s Yuma Proving Ground (Yuma, AZ, US). Tracks are posted in real-time to APRS.FI and HabHub. In the US, radiosondes typically transmit in the 400-403Mhz range.

2 Likes

Thanks Fredric, in fact I already use the software from SQ6KXY. I wanted to point out that there is a conflict of frequency usage here, and early joy at receiving a clear signal may lead to disappointment when you find that you have not tracked a satellite but something a lot closer to earth :upside_down_face: