Hi all Helmut, dc6ny, and I have done some more tests yesterday. The band starts opening again (wonderful: we always want to test 700B). As stated earlier, we never had any problem with the 700B-tuning: cohpsk locks quicker than the fdmdv, at least, this is the impression we get from our experiences. Yesterday, I started to reduce my power (measured by an LP-100A just before the antenna coupler) when txing in 700B. Helmut detected the signal and I reported about my power seting: Full drive started with 58Watts peak. Then I reduced the power to 100mW peak (reading the quickly changing "average" of LP-100A). This was the last setting, that I could read on the LP-100A, my relative powerseting was at 7 out of 256. Then I reduced to 6, then to 5, to 4, to 3, to 2. After this experiment, Helmut reported, that he could fully decode the signal at 6, but at 5 only about 50% and lower no decoding anymore. We estimated, that setting 6 was about 50 mWatt.
We both are very impressed by this result! Unfortunately, during our experiment at higher power there were some people trying to destroy our signal: I have to say, that they were sucessful. In this respect, the 1600 was a little less critical. But I think that this is just a remark. Against bad guys, one can not fight. 700B is realy a very good mode. I try to convince more people, to make experiments. but it is not so easy, because amateurs today seem to sit in their chair and enjoy not to experiment! What a difference to what we heard from the amateurs in the twenties! Great, to hear, that there will be presentations in conferences! 73, hb9epu On 22.09.2015 04:44, Walter Holmes wrote: > I guess I must really be missing something here. :) > > I have been using 700 and 700B since it was first released in early beta > many weeks ago and have NEVER had an issue with tuning, as long as the > person at the other end WAS also on frequency. > > As long as my radio is on the right frequency it locks on very well. > > It almost sounds like we're trying to solve a problem that doesn't really > exist on the air in everyday use. > > Of course with the Waterfall on a computer it will be many times easier. And > use of the QSO Finder to let people know WHAT frequency you're on, it's a no > brainer. > > When you see the carriers and the bandpass filter set to 1.5k, just center > it in the waterfall screen, and done. > > Since we have not had the code to try it on an SM1000 just yet, that may be > slightly more difficult, but even still, I would use the dial of the radio > to set it to either a known frequency or center up on the sound. > > Just my 2 cents.. :) > > Walter/K5WH > > -----Original Message----- > From: David Rowe [mailto:[email protected]] > Sent: Monday, September 21, 2015 7:39 PM > To: [email protected] > Subject: Re: [Freetel-codec2] Tuning Aid 700B mode > > Just curious - have any of you actually tried 700B OTA? > > On 22/09/15 09:56, glen english wrote: >> how about a modulated output or something from the speaker to assist >> tuning- IE a variable tone, or a series of clicks at some frequency as >> to provide tuning direction feedback. >> >> maybe fallng chirps when you are too low, and rising chirps when you >> are too high... etc ? >> >> >> On 22/09/2015 8:39 AM, Stuart Longland wrote: >>> On 15/09/15 18:42, David Rowe wrote: >>>> The CPU load is proportional to the initial freq offset estimation >>>> bandwidth. I'm inclined to wait a little and see if this is a real > problem. >>> Tuning accuracy is likely to be an issue on headless systems or for >>> visually impaired operators. >>> >>> >>> --------------------------------------------------------------------- >>> --------- >>> >>> >>> _______________________________________________ >>> Freetel-codec2 mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >> -- >> - >> Glen English >> RF Communications and Electronics Engineer >> >> CORTEX RF >> & >> Pacific Media Technologies Pty Ltd >> >> ABN 40 075 532 008 >> >> PO Box 5231 Lyneham ACT 2602, Australia. >> au mobile : +61 (0)418 975077 >> >> >> >> ---------------------------------------------------------------------- >> -------- >> >> >> >> _______________________________________________ >> Freetel-codec2 mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >> > ---------------------------------------------------------------------------- > -- > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > ------------------------------------------------------------------------------ > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
