Re: [digitalradio] What mean Too Wide?
24.05.2010 22:45, Rick Westerfield kirjutas: This would be a general definition that perhaps not everyone could fully agree on: Too Wide: takes up too much spectrum bandwidth for the amount of information delivered or the speed of the information's delivery. Rick, academically you are right. But the question/poll is about keyboard modes mental limit. For me the limit somewhere around rtty45 bw. Olivia 500 too wide, mfsk16 somewhere on the limit. The psk31 is de facto standard. I think good idea to measure/evaluate things with this standard. MFSK modes are undervalued but not in every case. For good or moderate propagation psk31 is the best (not academically). But for poor/disturbed propagation and in higher latitudes there are better modes. We can use many mfsk modes with different bw and tones. From standard user viewpoint - more is less. RSID, Video ID are good things. But we need de-facto mfsk-standard like psk31 to fire psk-folk in case of poor/disturbed propagation to switch mode. This is strategical/promotional BIG step. IMO Contestia 250/4 (or /8?) is enough good bw/speed compromise to take de facto mfsk-standard role. There are better modes/formats from speed viewpoint DominoEX11, MFSK16 or from snr viewpoint 250/16: So what mean too wide mode mentally? http://contestia.blogspot.com/ vy73 Jaak es1hj Poor or disturbed propagation constrains all of us into fewer bands for digital operations. With fewer sunspots, we all crowd the same bands which makes the too wide problem worse. Some modes are very narrow and are spectrum efficient but have little error correction. Others are too wide but have lots or error correction and are fast. As you very well know, these are the tradeoffs we all face. This definition might cause a bit of a Food Fight here on this reflector but hopefully . . . not. Rick -- KH2DF *From:* digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] *On Behalf Of *Jaak Hohensee *Sent:* Monday, May 24, 2010 1:21 PM *To:* digitalradio@yahoogroups.com *Subject:* [digitalradio] What mean Too Wide? Hi Sometimes we hear, that mode or format is too wide. What this mean? Context - poor or disturbed propagation. Please answer. Your answer help to see how different people understand the term too wide. http://contestia.blogspot.com/ http://contestia.blogspot.com/ tnx! -- vy 73, Jaak es1hj -- Kirjutas ja tervitab Jaak Hohensee
[digitalradio] HAM-MAG Article - Digital Sound Card Modes
A 7 page article on getting started with digital sound cards modes appears in the May 2010 issue of HAM-MAG P17 - Getting Started with Digital Sound Card Modes with the Yaesu FT817 Transceiver The May 2010 issue can be downloaded free from http://ham.france.free.fr/crbst_17.html 73 Trevor M5AKA
[digitalradio] Re: SSTV AMPLIFIER
--- In digitalradio@yahoogroups.com, obie47165 obie47...@... wrote: Any suggestions for a amp vhf for SSTV I inquired with MFJ...and they said NO, for sstv on their line of amps. Any help appreciated... POB/K8LEN If you're operating SSTV via FM, any 2m amp will do the job. If you're operating via USB (like on HF), any LINEAR amp will do. Dave G4CLI
Re: [digitalradio] About digital reception and SDR.
Simon - A little off topic, but I have scoured the internet and forums and I cannot find a fix for Windows 7 crashing with DM 780. I am a loyal fan of the software and have donated as well. Can you point me in the right direction? Frank KD8FIP On Mon, Apr 19, 2010 at 3:39 AM, Simon HB9DRV simon.br...@kns.ch wrote: An advantage of writing my own console is I don't have to wait in the hope that other developers add features I would like to see. Before the end of May I'll be decoding digital modes inside my console and will be able to put the filter right after the mixer (and decimator). So for a PSK31 signal I'll be able to use a 60Hz filter with *very* steep skirts and have the optimum digital mode receiver. I'll get Andy K3UK to test this when it's available. After this I'll integrate DM780 so that the console can be used for TRX with the MOBOKIT SoftRock derivative. Simon Brown, HB9DRV http://sdr-radio.com -- Frank KD8FIP
[digitalradio] mt63
Is there any activity on mt63 on 20 meters or is it far and few between.. POB/K8LEN
Re: [digitalradio] mt63
maybe one or two stations per day, tops. On Wed, May 26, 2010 at 8:07 PM, obie47165 obie47...@yahoo.com wrote: Is there any activity on mt63 on 20 meters or is it far and few between.. POB/K8LEN
Re: [digitalradio] mt63
If so What frequencies do they normally hang out on -80/40/20 meters? Hal - Original Message - From: obie47165 To: digitalradio@yahoogroups.com Sent: Wednesday, May 26, 2010 8:07 PM Subject: [digitalradio] mt63 Is there any activity on mt63 on 20 meters or is it far and few between.. POB/K8LEN
RE: [digitalradio] About digital reception and SDR.
Hi, If Windows 7 crashes with BSOD then it's a driver issue - I suggest serial port or USB soundcard. If it's the program crashing shout at me - I've been *very* busy getting SDR software written but in maybe two weeks will be able to get back into the HRD suite. I'll get a dump file from you... Simon Brown, HB9DRV http://sdr-radio.com From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of Frank MacDonell Simon - A little off topic, but I have scoured the internet and forums and I cannot find a fix for Windows 7 crashing with DM 780. I am a loyal fan of the software and have donated as well. Can you point me in the right direction? Frank KD8FIP
