[digitalradio] PActor ??
Can anyone tell me what freqs are being used for HF pactor. I have an ole MFJ 1278 and would like to start monitoring and get on Pactor1. Pse advise, tks 73 Art Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [digitalradio] ALE QRM
Zip! Oh, was that a rhetorical question? (HI) >From: John Bradley <[EMAIL PROTECTED]> >Reply-To: digitalradio@yahoogroups.com >To: digitalradio@yahoogroups.com >Subject: [digitalradio] ALE QRM >Date: Sun, 27 Aug 2006 20:30:15 -0600 > >It is truly amazing to me that the same hams who have torn up this group >time after time, objecting long and vigorously against >automatic Pactor stations , are promoting the concept of ALE sounding on HF >24/7 > >Talk about being hypocritical !!! If we have 1000 Ale stations sounding >24/7, how much QRM will this create? > >John >VE5MU > > > >-- > > > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.0.405 / Virus Database: 268.11.6/428 - Release Date: 8/25/06 > > >[Non-text portions of this message have been removed] > Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] 40M PSK Activity on 7035
Hello All, I have been active from 1000Z to 1300Z most evenings on bpsk31 at 7035 USB +1500 Hz or so (and sometimes on 7070). The band opens to West Coast USA earlier in the evening and then to East Coast later and often Japan very late. Hope to catch some people from this list there - I would love to give you a new country on 40m PSK. Some of us are having a lot of fun with the DX on 40 - it is great for people like myself who find it hard to make time to operate on 20m during daylight hours. 73 de Brett VK2TMG -- === Brett Rees VK2TMG http://lisp.homeunix.net [Non-text portions of this message have been removed] Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Re: USB Sound Card
On Thu, 2006-08-31 at 15:58 +, w7psk wrote: > --- In digitalradio@yahoogroups.com, "Kenneth Monty" <[EMAIL PROTECTED]> > wrote: > > > > Has anyone tried the new miniature UB sound card devices? I see one > > for $10 and it would be nice to have a seperate sound device for > the > > radio connected to USB. > > > > 73 de Ken/KC9FOA > > > > Ken > I see lots for 50 and up, where you see the $10 one. Might interesting > to try it. > > Scotty W7PSK Hello! New to the list. I was looking at USB sound options for the NSLU2 the other day. I'm interested in something that would work with the AX.25 soundmodem driver. There are plenty of $50.00 models boasting names we would all recognize but I ran across this [1]. This individual [2] claims success -- specifically on the NSLU2. They can be had on eBay for $0.99 plus shipping. Average total cost is less than $10.00. It would be a kick to see if this would work. If anyone has any experience with this device, I'd be most interested to hear about it. [1] http://www.allproducts.com/manufacture98/comodow205/product4.html [2] http://www.nslu2-linux.org/wiki/HowTo/SlugAsAudioPlayer -Jeff KE7FRJ Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Re: ALE QRM is minimal
>To be honest, using a high speed baud rate modem on HF and then encoding >it to > >slow down the effective bps, seems the exact opposite of what is > normally done > >with slower baud rate and higher order modulation to get the higher > throughput. Rick, The actual BPS rate for 188-110B is 7200, for 188-141B it is 375. Higher order modulation is being used to get higher throughput. In the case of 188-110B you have in some cases much heavier use of FEC, redundancy and training. The question remains about the symbol times. We know that 300 baud packet is not useless on HF, although it is not optimized. I would like to re-conduct the experiments that were run in 2002 where the baud rate of HF packet was reduced. This time perhaps leaving the shift at 200 Hz and reducing the Baud rate to 100. I think however the long QSB will still be the major contributing factor to failure of packets. Since you have to decode the entire frame and get a good CRC, you are better off with short frame times. So far this has been the case with my QSO's using 188-141A. The shorter the message, the better the chance of success. Anyone for some 100 Baud packet? 73, Mark N5RFX Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Re: 188-110B
>In the limited testing I've tried with image files, it works very >well, indeed. Perhaps we can try exchanging some images next time we >link. Bonnie, Great. Yes I have had some QRN here and the QSB has been a problem too., and none of the 8FKS signals I have seen have been super strong. WA3MEZ and I sent a few AMD and DTM messages back and forth. I had my radio scanning 20 meters, but not sounding, so you can find me there. 73, Mark N5RFX Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Packet Baud Rate
I went searching in my archives for some testing that was done in May of 2002 with Packet on HF using different Baud Rates and shifts. MixW has the capability of setting custom Baud Rates and Frequency shifts. Looking through my notes I noticed that we started with 100 Baud and a 60 Hz shift. I don't remember what other Baud rates and shifts we tried, but believe it or not, I do remember that 300 baud was just about right for AX.25 on HF. It may have something to do with Packet being frame oriented instead of character oriented. 73, Mark N5RFX Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] ALE Saturday Re: ALE tasting party
List of ALE stations seen on 20 meters on Saturday so far: WD8ARZ N5RFX WA3MEZ WB6MLC K5SKH KN4HH 73---Bonnie KQ6XA > A few us will be on the air with ALE this weekend testing some new > things. If you would like to try a taste of ALE, please join us > Free PCALE software is available on HFLINK website: > http://hflink.com Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Re: 188-110B
--- In digitalradio@yahoogroups.com, Mark Miller <[EMAIL PROTECTED]> wrote: > Now how well this all works remains to be seen. > > 73, > > Mark N5RFX Hi Mark, In the limited testing I've tried with image files, it works very well, indeed. Perhaps we can try exchanging some images next time we link. Bonnie KQ6XA Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] MIL-STD-188-141B
This standard may be found at http://tracebase.nmsu.edu/hf/standards/MIL/141Bn1.pdf . The single frequency modem is 8FSK running at 125 baud, 3 bits per symbol, 375 bits per second. A word is 24 bits. 3 bits are preamble, 21 bits are 7 bit characters. Each 24 bit word is encoded into a Golay (24, 12, 3) word totaling 48 bits plus one stuff bit, for a grand total of 49 bits. Thus every 3 characters is 49 bits. These 49 bit Golay words are repeated 3 times. (125 symbols/49 bits) * 3 = 7.75 characters per second * 7 = 53.6 bits per second. 73, Mark N5RFX Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Re: ALE QRM is minimal
Bob, >Didn't you do the software development for this modem to run under Linux back >in 1999 or so? > >Whatever happened to it and how would something like this perform on say, 6 >meters where I would expect you could use it? > >If amateur radio did get permission to use high baud rate modems on HF >digital, >would you recommend going this route instead of the approach that SCS took >with >Pactor? > >To be honest, using a high speed baud rate modem on HF and then encoding it to >slow down the effective bps, seems the exact opposite of what is normally done >with slower baud rate and higher order modulation to get the higher throughput. > >If you were to determine baud rate from a given modulation, wouldn't you just >determine the symbol length in milliseconds and then divide 1000 by that >symbol >length? Ergo, the Mil Std 188-110-A1 must have symbols that are well under 0.5 >ms? > >73, > >Rick, KV9U > > > > >Robert McGwier wrote: > >>What? That was basically unintelligible. >> >> >>Mil Std 188-110-A1 2400 baud serial modem combines several features to >>mitigate the channel. >> >>Furthermore TWENTY FOUR HUNDRED BAUD DOES NOT MEAN 2400 bps. It >>almost never does. What happens in the modem is multiple 2400 baud >>symbols are put together to encode the data at a slower rate. This can >>be as low as 75 bps.The channel symbols are sent at 2400 baud. >> >>There is forward error correction done on the data and the encoded data >>is permuted in time in a block form. The type of forward error >>correction works best when the channel induces errors in isolation. On >>a typical HF channel, the errors come in bunches. So the permutation >>mentioned above, spreads these errors out in time to isolate them. >>CLEVER DEVILS. This was the ingenuous trick that made it all work. >> >>To slow down the data rate, the data is repeated from zero to several >>times. The encoded redundant data provides more energy per bit since it >>involves now N more bauds (where N is the number of repeats). >> >>I have << NEVER >> in many years of working with this scheme, seen the >>high DATA rates work well over multiple hop channels. I have seen 1200 >>bps be quite robust and 600 bps very robust indeed. I have seen 75 bps >>work when you cannot detect the modem is on the channel. >> >>73's >>Bob >>N4HY >> >> > > > Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] 188-110B
After reading the spec at http://tracebase.nmsu.edu/hf/standards/MIL/188-110B.pdf I see from a high level how the fixed frequency modem works. Table XIX in the document gives a great summary. I have taken a snapshot of that table an posted it at http://home.comcast.net/~mdmiller7/ale/table_xix.jpg . Also I have pulled off a block diagram that is very helpful at http://home.comcast.net/~mdmiller7/ale/block_diagram.jpg . Remeber that the final symbol rate is always 2400 bps. I have not looked at how the lower symbol rates in Mars ALE affects this explaination. In table XIX the information rate is the actual bps throughput. The coding rate is the ratio of input bits to output bits in the FEC encoder. The channel rate is the symbol rate after FEC and Interleaving. The bits/channel symbol tells you what to divide the channel rate by to get the symbol bits per second before symbol formation. The 8-phase symbols/channel symbol tells how many 8 phase symbols there are per channel symbol. This number is multiplied by the symbol bits per second to determine the symbols per second after symbol formation. The last two columns give the ratio of unknown to known 8 phase symbols. The unknown data is message information, the known data is training bits reserved for channel equalization. Starting with the information rates, here is flow. 4800 bps has no coding so the channel rate is 4800 bps. There are 3 bits per symbol. so the symbol bits per second before symbol formation is 1600 bps. There is 1 8 phase symbol per channel symbol, so there are 1600 channel symbols per second of known data. The ratio of unknown to known symbols is 32/16. so the known symbol rate is 1600/2 or 800 symbols per second. 1600 + 800 is 2400 symbols per second. 2400 bps has a coding rate of 1/2. This makes the channel rate 4800 bps (1 bit in gives you 2 bits out). 3 bits per symbol for 1600 bps. There is 1 8 phase symbol per channel symbol, so there are 1600 channel symbols per second of known data. The ratio of unknown to known symbols is 32/16. so the known symbol rate is 1600/2 or 800 symbols per second. 1600 + 800 is 2400 symbols per second. 1200 bps has a coding rate of 1/2. This makes the channel rate 2400 bps. 2 bits per symbol for 1200 bps. There is 1 8 phase symbol per channel symbol, so there are 1200 channel symbols per second of known data. The ratio of unknown to known symbols is 20/20. so the known symbol rate is 1200/1 or 1200 symbols per second. 1200 + 1200 is 2400 symbols per second. 600 bps has a coding rate of 1/2. This makes the channel rate 1200 bps. 1 bit per symbol for 1200 bps. There is 1 8 phase symbol per channel symbol, so there are 1200 channel symbols per second of known data. The ratio of unknown to known symbols is 20/20. so the known symbol rate is 1200/1 or 1200 symbols per second. 1200 + 1200 is 2400 symbols per second. 300 bps has a coding rate of 1/4. This is accomplished by repeating the coding twice. This makes the channel rate 1200 bps. 1 bit per symbol for 1200 bps. There is 1 8 phase symbol per channel symbol, so there are 1200 channel symbols per second of known data. The ratio of unknown to known symbols is 20/20. so the known symbol rate is 1200/1 or 1200 symbols per second. 1200 + 1200 is 2400 symbols per second. 150 bps has a coding rate of 1/8. This is accomplished by repeating the coding 4 times. This makes the channel rate 1200 bps. 1 bit per symbol for 1200 bps. There is 1 8 phase symbol per channel symbol, so there are 1200 channel symbols per second of known data. The ratio of unknown to known symbols is 20/20. so the known symbol rate is 1200/1 or 1200 symbols per second. 1200 + 1200 is 2400 symbols per second. 75 bps has a coding rate of 1/2. This makes the channel rate 150 bps. There are 2 bits per symbol for 75 bps. There are 32 8 phase symbol per channel symbol, so there are 2400 channel symbols per second of known data. All data is known data, so the symbol rate is 2400 bps. Now how well this all works remains to be seen. 73, Mark N5RFX Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] ALE tasting party
ALE is up and running on twenty meters. Don't see a download for new version on any ale sites. 73 from Bill - WD8ARZ South Bend, Indiana - Original Message - From: "expeditionradio" <[EMAIL PROTECTED]> To: Sent: Saturday, September 02, 2006 5:11 AM Subject: [digitalradio] ALE tasting party >A few us will be on the air with ALE this weekend testing some new > things. If you would like to try a taste of ALE, please join us on 20 > meters. > > Bonnie KQ6XA Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] ALE tasting party
A few us will be on the air with ALE this weekend testing some new things. If you would like to try a taste of ALE, please join us on 20 meters. Bonnie KQ6XA Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
