Thanks Jann. Our use case is access links to and backup links in our 5GHz backbone in amprnet.se. We have done some successful experiments with NPR70 for that purpose but since our regulator has given us a more narrow 70cm band (432-438 MHz) than many other countries, we are also looking at 23cm.

On 2020-10-15 21:56, Jann Traschewski via 44Net wrote:

Hi Bjorn,

yes, HNAP4PlutoSDR will even work on the 23-cm-band. Lukas tried it successfully with the latest release candidate (rc1) on 1298,850 MHz (Basestation) and 1242,850 MHz (Client).

Just have a look at the following file and adjust the parameters "dl_lo" and "ul_lo": https://github.com/HAMNET-Access-Protocol/HNAP4PlutoSDR/blob/master/config.t...

You could even use frequencies for cross-band operation (e.g. 23-cm downlink and 70-cm uplink), however we need to fix the carrier frequency offset calculation first. See Issue 43: https://github.com/HAMNET-Access-Protocol/HNAP4PlutoSDR/issues/43

Thanks for bringing this up. The system is designed for multi-user access, however we might be able to revive some old 23-cm full-duplex interlinks we used for packet radio quite a while ago :) We should make more use of our bands!

73, Jann DG8NGN

On 13.10.2020 17:18, Bjorn Pehrson via 44Net wrote:

...

Hi Jann,

I understand that the ADALM Pluto SDR platform could make 23cm as well.

Do you think there would be any problem using Lukas HNAP implementation on 23cm, not only 70?

On 2020-09-09 22:13, Jann Traschewski via 44Net wrote:

...

Hello AMPRNet,

we like to announce a new open source HAMNET-access solution for the 70-cm-band making use of the popular ADALM Pluto SDR.

Lukas Ostendorf recently finished his master thesis "Design of a Radio Communications Protocol for HAMNET Access in the 70cm Amateur Radio Band" at our employer Rohde & Schwarz in Munich.

We are pleased to publish his work and further material today: https://hnap.de/2020/09/08/master-thesis-released.html

There are still some tasks like signal amplification on the roadmap, but the community is growing and helping to move on. It seems the telegram group chat is currently the best place to exchange: https://t.me/hamnet_access_protocol Most communication is in German, however I'm pretty sure English is fine as well. At least you will find nice pictures of current experiments in the backlog :)

Looking forward to your contribution, for the HNAP-Team, Jann DG8NGN

-- Jann Traschewski, Faber-Castell-Str. 9, D-90522 Oberasbach, Germany Tel.: +49-911-99946898, Mobile: +49-170-1045937, E-Mail: jann@gmx.de Ham: DG8NGN / DB0VOX / DB0FOX / DB0ZM / DB0DBA / DB0HZS

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