[digitalradio] SDR-Radio beta 1 released
Manxman, Simon Brown, has released first beta version of SDR-Radio http://www.sdr-radio.com/LinkClick.aspx?fileticket=XvE0QU_t0bM%3dtabid=318mid=1281forcedownload=true V1.0 Beta SoftRock VFO support (Si570) Waterfall colours redesigned together with Pieter from RFspace Much minor cosmetic work Preview 1e Added AF Spectrum, use this window to adjust the filter width and view the AF signal Added Graphics Equaliser Added Pseudo Stereo New DSP engine with better filtering Code optimised to lower the CPU demand (using the Intel® VTune™ Performance Analyzer software) Previous releases were part of a set of technological previews. The major addition to this release is support for Softrock SDRs . Th isis NOT the release that includes direct digital mode decoding, that is planned for later this summer. Andy K3UK http://www.obriensweb.com/digispotter.html Chat, Skeds, and spots all in one (resize to suit)Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) * To change settings via email: digitalradio-dig...@yahoogroups.com digitalradio-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: digitalradio-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] About digital reception and SDR.
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
[digitalradio] Re: About digital reception and SDR.
Simon, my birthday is May 31...it would be nice... Andy K3UK --- In digitalradio@yahoogroups.com, Simon HB9DRV simon.br...@... 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
[digitalradio] JT650Hf available again
Downloads of JT65-HF Version 1.0.5.1 has been restored http://groups.google.com/group/jt65-hf Join the above group for access to the free beta software Andy K3UK
[digitalradio] Multipsk
Hello Group, Upon starting MultiPsk, I get an error message No sub-directory Maps!? Any way to fix error? 73, John KJ1J
[digitalradio] Re: Multipsk
create a maps folder --- In digitalradio@yahoogroups.com, jgmags2000 jgmags2...@... wrote: Hello Group, Upon starting MultiPsk, I get an error message No sub-directory Maps!? Any way to fix error? 73, John KJ1J
[digitalradio] 3rd Generation Digital radio
If the first generation of digital was PACKET-IRLQ-Echolink-APRS (generation Zero was CW and RTTY), then the second generation was D-Star. D-Star brought everything together along with digital voice. While D-Star is great, its technology is already dated. So what will the third generation of digital radio look like? I am thinking that it will be more like the Trunked Radio (digital) or either P25 phase II or TETRA. TETRA is 25 Khz wide channel with four TDMA slots with a very low cost handheld (under $400) and is used in Europe within the 400 Mhz band. P25 digital currently is 800 Mhz, FDMA (25 Khz channel). Phase II will move to a single 12.5 Khz channel with two TDMA slots. Additional capacity can be added with additional repeaters (12.5 Khz) working under a common controller. So, could we do something like that within amateur radio? We have to be above 220 Mhz in order to get 9600 baud rates. If we look at bands, 900 Mhz may be to high and 440 may be too crowded. It was suggested that we go 220 as it gives a mix of characteristics of both 2m and 440 and is fairly open. If we go to P25 (phase II) we do have to overcome the cost of the VOCORDER. That could be done with open P25 in software in an software defined radio (SDR). Most of the military radios these days are SDR. A trunked system would allow us at least state wide communications that would include voice, data and position reporting (APRS). Also that one could link into the system via VoIP (like D-Star or Echolink). A small community might only need a single repeater with two FDMA slots. In big cities it might be that there are multiple repeater sites with two or three repeaters (4 to 6 slots). Also five simplex frequencies for tactical operations or remote areas (like using 146.52 and 144.39 now). Using 9600 baud rates would allow for greater amounts of information. And an SDR would be flexible enough to handle such data rates. Any comments or ideas? Let the flame wars begin.
[digitalradio] VHF / UHF Digital Beyond line-of-sight
Skip, Thanks for the UHF screenshots. There has to be motion or change taking place within the refractive medium to cause Doppler and it would seem this holds true for the type of atmospheric enhancement found on VHF/UHF. I can see why it's necessary to use the most robust modes if both Doppler spread and Doppler shift are present much of the time; I'm sure aircraft scatter is no help either. Speaking of aircraft reflections; I recorded a short video of the effect today using a local 2 meter beacon as the signal source (see link below). The beacon is only 10 miles from my home and the AC Doppler can be quite strong; often competing with the S9+ signal. You can hear (and see) the two signals beat together as the AC Doppler sweeps across the spectrum. There's quite a bit of air traffic out this way so it would be easy to test how much of an effect this has on digital. I'll have to pursued a local buddy of mine to participate. Long distance VHF/UHF will have to wait until I can find a place for my Yagi's. Aircraft Doppler recording -- http://www11.zippyshare.com/v/10329668/file.html 7 Zip extraction utility -- http://downloads.sourceforge.net/sevenzip/7z465.exe Tony -K2MO
