Sorry Alan, I don't think that you can transform the special situation in your outback to the congested areas on this globe. There the HF spectrum is completely out of commercial interest due to the unlimited growth of man-made noise and interference problems. Only some military user keep shortwave as side track alive. Maritime HF radio or LF navigation is dead. Broadcasting stations closed down. Aircrafts still use AM modulation only for ground approach.
The greed for bandwidth dominates the development of innovative techniques on much higher frequencies e.g. for satcom, 5G small cell communications or low orbit satellites. Secure communication and messaging is of course guaranteed. In this technical environment even hobbyists can be hardly convinced of new toys. Take it easy. 73, Helmut, DC6NY Am 21.02.2022 um 10:02 schrieb Al Beard:
Hi all, I've mentioned, ALL and I mean ALL NSW country ambulances and stations have been equipped with HF digital radios! They have recognised the need for secure, not able to be listened to by SSB listeners, communications. Do you guys not recognise this??????? We here in the FreeDV community are exploring this new technology. We are not limited by standards necessary for multi-vendor interoperability. We can use the most current low cost low power technology. Eg. Small board computers are increasing in power every day. The 2020 mode is nearly workable on the Pi4B. All over Australia we have 10m, 6m, 2m and 70cm repeaters but still we have many areas, wide open spaces, deep valleys not covered. Is this where several HF repeaters could be very very useful? * * Another advantage of HF,* site height is not needed. *Only a low noise site. All I'm asking for is, some documented frequencies so we can know where we can find a repeater or freebeacon . Just like we have for the FM repeaters! We are in the experimental phase so, on "our" websites. Later, our ARRL's, RSGB's and WIA's will follow. * * *My 2c* * * *Alan VK2ZIW* * * * * *On Mon, 21 Feb 2022 00:02:16 -0800, Mooneer Salem wrote* > Hi Helmut, > > From what I've seen, it seems that the main issues are the following: > > 1. Simply finding someone else to talk to. That's one of the reasons why the quarterly Activity Days started up. Of course, there is room to improve how those are held, and I'd definitely appreciate any feedback in that regard. > 2. Ease of configuration/use as FreeDV's use of two sound cards is unusual for ham radio applications. There are ongoing efforts to improve that, but code contributions towards that goal are welcome. > > As for whether it's better than SSB, there was some controlled testing last year and the conclusion is more like "it depends". More info is at http://www.rowetel.com/?p=7779 if curious. > > Thanks, > > -Mooneer K6AQ > > On Sun, Feb 20, 2022 at 11:47 PM Helmut Oeller <dc...@gmx.de> wrote: > Hi, > > All SSB-capable SDR designs as HPSDR (ANAN), FlexRadio, ADALM Pluto > (AD), LimeSDR, SunSDR etc. can use FreeDV without any addional hardware > and cost. I know many operators who gave freedDV a try, but the > enthusiasm tended to zero. Why? At least on crowded HF bands and due to > propagation features FreeDV will never beat SSB. The theoretical SNR > advantage goes lost at short interference bursts, selective fading and > other BER-reducing effects. > > I'm afraid that you have to live with the insight that freeDV will > remain a nice play ground just for a few hams. > > 73, Helmut, DC6NY > > Am 21.02.2022 um 05:12 schrieb Al Beard: > > Hi guys, > > > > One "problem" for Digital Voice transmissions over HF > > where the bands are not channelised is knowing what > > frequency a "freebeacon" is listening too. Once found, > > very unlikely, then what mode. > > > > The site "qso.freedv.org <http://qso.freedv.org/>" has a list but it does not have > > frequencies for such as "freebeacon". Yes, one can specify a frequency > > but that information is lost when lots of other comments are posted > > or when one is logged out, the frequency on the LHS pane disappears. > > > > Also, we need standard trigger strings also on the website! > > These should contain a character such as "@" which is never in a callsign. > > > > As an aside, the SM1000 also should be switchable to send this text string. > > > > Comments please as I don't want my freebeacon here to be a nuisance on > > the one and only documented frequency on 40m. > > > > 73 > > > > > > --------------------------------------------------- > > Alan VK2ZIW > > Before the Big Bang, God, Sela. > > OpenWebMail 2.53, nothing in the cloud. > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > Freetel-codec2@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > --------------------------------------------------- Alan VK2ZIW Before the Big Bang, God, Sela. OpenWebMail 2.53, nothing in the cloud. _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
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