against PLT / PLC

Currently a new draft european standard prEN 50561-1 is widely discussed. Amongst defined notches for amateur radio bands and dynamic notching for shortwave radio stations it also includes raising the allowed levels of PLT signals on mains lines by about 30dB ! This would mean that any SW radio close to such modems will be impossible.
There is a big discussion in forum.darc.de and in hamradioboard. There is the assumption that raising the levels for PLT will cause other electronic manufacturers to claim for higher interference levels as well. In addition future PLT modems will sure also work up to several hundret MHz to get the high bandwiths required for video streaming. This will affect VHF radios, broadcast radio and even TV broadcasting.
Therefore there is a openpetition which allows you to demonstrate your opinion against PLT devices and against this draft european standard:
https://www.openpetition.de/petition/online/schutz-der-ressource-frequenz-vor-elektromagnetischen-stoerungen-durch-plc
Some very interesting background can be found on the pages of the IRT:
http://www.irt.de/de/publikationen/technische-berichte.html
The german body for elaboration of electronic standards DKE will meet today (Oct. 22th) to decide if they will vote for or against this draft standard on european level. Whatever this decision will be it makes sense to vote against PLT in the petition above…

DVRPTR, DVModem and D-Star

Last weeks from time to time i am playing around with the really nice software DV-RPTR Control Center from Kurt, DJ0ABR.
I am using a Siemens C5 modified for 70cm and equipped with a DVModem for digital voice or a DVRPTR PCB with a external TRX (either FT-857D or another C5).
The hardware is connected to the PC via USB and the DV-RPTR Control Center software connects it to XReflectors, Reflectors or Repeaters. It can also do callsign routing.
A really nice addon is the display of some slow data that is transmitted in parallel to the voice stream. There you can usually see the name or QTH of your QSO partner. The location that is displayed by the PC software comes either from GPS (DGPS) data transmitted by the sender or from a static lookup of hamqth.com.

DV-RPTR Control Center

DV-RPTR Control Center

For Sale / Verkaufe

In the future i will put some equipment that i do not use anymore to the “For Sale” page. Most of the stuff is a bit special probably but if you are interested please contact me via eMail (dh5ym@darc.de).
In Zukunft werde ich ab und an ungenutztes Equipment auf meiner “For Sale” Seite eintragen. Die meisten Sachen sind wohl etwas speziell, aber bei Interesse bitte ich um eine eMail an dh5ym@darc.de.
Link:
http://dh5ym.hopto.org/wiki/?page_id=590

Datenfunk Treffen Dresden 26.06.2010

mehr Informationen hier: http://dh5ym.hopto.org/wiki/?page_id=450

Falls jemand den Weg nicht findet, versuche ich auf DB0DD (145.675-) QRV zu sein. Alternativ DB0TUD (438.875-).

Anfahrtskizze:

Anfahrtskizze Digitalfunk Treffen 26.06.2010

Anfahrtskizze Digitalfunk Treffen 26.06.2010

Gepante Vorträge:
– Aktueller Stand Hamnet Tests in Sachsen
– Router unter OpenWRT als Gateway zwischen AX25 und TCP/IP (DH5YM)
– Ubiquity Hardware für Hamnet, selber Compilieren und Konfigurieren (DG1CPA)
– Netzkonfiguration im Hamnet (DL1JAD?)
– Aktuelle Entwicklungen bei D-Star

Weiterhin ist es möglich Antennen bis 23cm vor Ort zu vermessen, Hamnet Equipment kann gezeigt und vorgeführt werden. Sicher ist auch eine Vorführung von D-Star mit Siemens C5 und anderen Geräten möglich.

Selbstverständlich ist es auch noch möglich zusätzliche Vorträge einzutackten.

Noch ein Hinweis: Da die Lokalität normalerweise Samstag Vormittag nicht geöffnet ist kann der Wirt bis zum Mittagstisch kein Essen anbieten.

New digipeater hardware at DB0TUD

End of 2009 we had to install some new hardware at the digipeater DB0TUD (TU Dresden, Suedhoehe). Reason were the outstanding noise generated by powersupply and flexnet PC towards the remote controlled shortwave station. After a failed attempt to replace the old ISA USCC card with a PCIUSCC we installed a OpenWRT based WRT634U system with 2x TNC3 and 1x TNC2C running xnet. This is just a interim solution and will be replaced by DLC7 + TNC3 + TNC2C soon.

DB0TUD running OpenWRT/XNet

DB0TUD running OpenWRT/XNet