Re: [digitalradio] Some notes on JT65-on-HF operation
Hi Dimension 4 is a nice little program to Always keep your clock synchronized(..) You can download it from: http://www.thinkman.com/dimension4/index.htm 73 de LA5VNA Steinar Chris Danis wrote: Hi all, JT65 is a very different mode from more conventional keyboard modes. It is designed for EME operation with very weak signals, and to allow for just the bare minimum amount of information that defines a contact to be exchanged. This leads to some quirks in its operation, which I will do my best to explain below (I'm hardly an expert on this -- only been trying my hand at it for a few days!). This message got a bit longer than I had wanted it to be, so here's a quick summary of the points (if you don't follow these, many stations will not be able to work you!): - Always keep your clock synchronized, to one second or better accuracy - Always click the Auto is OFF button to make it so Auto is ON. Those who are interested in why, read on... The software has a notion of timeslots (as in EME operation). One station TXes, beginning at the start of a minute, for 48 seconds, then goes to RX for the remaining 12 seconds. The other station calls back at the start of the next minute, for 48 seconds, while the first station RXes for that full minute. This is the standard that stations follow -- if you don't conform to it, they will probably not be able to decode you. Thankfully, the software will enforce this timing for you if you press the Auto is OFF button. The button will then change to Auto is ON and will also be highlighted in red. Also tied in with this functionality is the Tx First checkbox: if checked, your TX slot will be the even minutes of the hour (first meaning first minute of the hour). If unchecked, your TX slot will be (you guessed it) the odd minutes of the hour. Obviously, one should pick the opposite of the station they are trying to work :) While Auto is ON you will always TX in your TX period -- so when you are done, make sure to turn it off, hi. Whether auto is on or off, the software will automatically attempt a decode at 52 seconds into the minute. If by the time you've decoded you're already into your TX cycle, just press the appropriate TxN button on the far right, where N is the number of the message you want (you'll see). If you ever need a quick reference on which is the appropriate message to send, just hit F5 (or menu item Help - What message to send?). Also note that decoding isn't an instantaneous procedure: pressing Decode while you are less than 52 seconds into the minute will attempt to decode last minute's tones again. One must wait for the end of the transmission cycle to get the latest decode. Hope this helps! best 73, -chris N2YYZ
[digitalradio] free text in JT65A
Hi all, Some of you are typing long massages in a JT65A qso on HF and I wonder how you do that. Chris N2YYZ wrote Always click the Auto is OFF button to make it so Auto is ON. but when Auto is ON is on there is no way I am able to type in a text. I simply don't have time. Few seconds after decoding a signal the auto transmission kicks in, and my Norwegian brain is to slow. My head will never be able to translate from Norwegian into English, and get something understandable on the air when the time is sow extreme limited. I hope this was understandable;) Is there a trick here I'm missing? 73 de LA5VNA Steinar
RE: [digitalradio] Some notes on JT65-on-HF operation
Thank you, Steinar. I managed to run it on HTTP mode, as couldn't find UDP ports to unblock on XP. Regards, Sergio, EA3DU -Mensaje original- De: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] En nombre de Steinar Aanesland Enviado el: viernes, 06 de abril de 2007 10:27 Para: digitalradio@yahoogroups.com Asunto: Re: [digitalradio] Some notes on JT65-on-HF operation Hi Dimension 4 is a nice little program to Always keep your clock synchronized(..) You can download it from: http://www.thinkman http://www.thinkman.com/dimension4/index.htm .com/dimension4/index.htm 73 de LA5VNA Steinar Chris Danis wrote: Hi all, JT65 is a very different mode from more conventional keyboard modes. It is designed for EME operation with very weak signals, and to allow for just the bare minimum amount of information that defines a contact to be exchanged. This leads to some quirks in its operation, which I will do my best to explain below (I'm hardly an expert on this -- only been trying my hand at it for a few days!). This message got a bit longer than I had wanted it to be, so here's a quick summary of the points (if you don't follow these, many stations will not be able to work you!): - Always keep your clock synchronized, to one second or better accuracy - Always click the Auto is OFF button to make it so Auto is ON. Those who are interested in why, read on... The software has a notion of timeslots (as in EME operation). One station TXes, beginning at the start of a minute, for 48 seconds, then goes to RX for the remaining 12 seconds. The other station calls back at the start of the next minute, for 48 seconds, while the first station RXes for that full minute. This is the standard that stations follow -- if you don't conform to it, they will probably not be able to decode you. Thankfully, the software will enforce this timing for you if you press the Auto is OFF button. The button will then change to Auto is ON and will also be highlighted in red. Also tied in with this functionality is the Tx First checkbox: if checked, your TX slot will be the even minutes of the hour (first meaning first minute of the hour). If unchecked, your TX slot will be (you guessed it) the odd minutes of the hour. Obviously, one should pick the opposite of the station they are trying to work :) While Auto is ON you will always TX in your TX period -- so when you are done, make sure to turn it off, hi. Whether auto is on or off, the software will automatically attempt a decode at 52 seconds into the minute. If by the time you've decoded you're already into your TX cycle, just press the appropriate TxN button on the far right, where N is the number of the message you want (you'll see). If you ever need a quick reference on which is the appropriate message to send, just hit F5 (or menu item Help - What message to send?). Also note that decoding isn't an instantaneous procedure: pressing Decode while you are less than 52 seconds into the minute will attempt to decode last minute's tones again. One must wait for the end of the transmission cycle to get the latest decode. Hope this helps! best 73, -chris N2YYZ
Re: [digitalradio] free text in JT65A
A good question Steinar. I sometimes will write some free text but not in direct response to the line that just popped up on my screen, usually I am just adding something like TU Steinar es 73 from NY . I am not asking questions like how is the weather in Norway? Last night, because of the situation you described, I did the opposite of what Chris suggested. I responded manually, waiting to see what the person said before I replied. This results in me starting the transmission 10 seconds , or so, late. The transmission ends on time, so I am not sure what real impact my 10 second late transmission has on anything. Andy k3UK On 4/6/07, Steinar Aanesland [EMAIL PROTECTED] wrote: Hi all, Some of you are typing long massages in a JT65A qso on HF and I wonder how you do that. Chris N2YYZ wrote Always click the Auto is OFF button to make it so Auto is ON. but when Auto is ON is on there is no way I am able to type in a text. I simply don't have time. Few seconds after decoding a signal the auto transmission kicks in, and my Norwegian brain is to slow. My head will never be able to translate from Norwegian into English, and get something understandable on the air when the time is sow extreme limited. I hope this was understandable;) Is there a trick here I'm missing? 73 de LA5VNA Steinar -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
[digitalradio] Unión de Radioaficionados Españoles (URE). RTTY Contest This Weekend
Sponsored by Unión de Radioaficionados Españoles (URE). Participants: Any licensed amateur station. Date: From 16:00 UTC April 7th to 16:00 UTC April 8th, 2007. Mode: RTTY BAUDOT. Bands: 10, 15, 20, 40 and 80 meters, according to IARU Region 1 band plan. Classes: 1) Single operator all band EA. 2) Single operator single band EA. (One band is only allowed during the contest). 3) Single operator all band non-EA. 4) Single operator single band non-EA. (One band is only allowed during the contest). 5) Multioperator EA, only all bands. 6) Multioperator non-EA, only all bands. NOTES: a) The use of cluster is allowed for all classes, but it is not allowed self-spotting. b) In the single operator categories only one signal is allowed in the air. c) In the multioperator categories only one signal is allowed by band. Contest call: CQ EA TEST. Valid contacts: Any station can be contacted during the contest. Every station can be contacted once per band. The points and/or multipliers derived from UNIQUE QSOs will be NOT valid. Exchange: Spanish stations: RST + Province code (see below). The foreign stations that transmit from the Spanish territory will be considered as EA stations. DX stations: RST + QSO number starting with 001. Multi-operator stations, if used multi TX, shall report separate serials per band starting with 001. Scoring: On 10, 15 and 20 meters, one (1) point for QSO within own continent, and two (2) points for QSO outside own continent. On 40 and 80 m, three (3) points for QSO within own continent, and six (6) points for QSO outside own continent. Multipliers: - EADX100 entities. - Spanish Provinces. - USA, Canada, Japan and Australia call areas (VE3, VE6, W5, JA1...). NOTES: 1) Each multiplier counts once per band. 2) The first QSO with W, VE, JA and VK stations, on each band, counts for two multipliers (EADX100 entity + call area). 3) The first QSO with EA, EA6, EA8 and EA9 stations, on each band, counts for two multipliers (EADX100 entity + Province). Final score: Total QSO points by total multipliers in all bands. Prizes: Trophy to the winner in each class. Certificate to the second and third places in each class. Certificate to the first classified of JA and VK. Certificates to all operators of the multioperator-stations rewarded. It is required at least 50 valid QSO to be eligible for any award. Logs: All logs should be submitted in Cabrillo format via Internet to the following E-mail address: [EMAIL PROTECTED] -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
[digitalradio] Clock sync
--- In digitalradio@yahoogroups.com, Sergio Manrique Almeida [EMAIL PROTECTED] wrote: Thank you, Steinar. I managed to run it on HTTP mode, as couldn't find UDP ports to unblock on XP. Just what I needed, thanks Steinar. Since the time change a few weeks ago here in the USA, my PC would not sync with time.com but this program allows me to sync and I get to use a facility (University of Toronto) that is very close. I think I shall be quite precise now. Andy K3UK
[digitalradio] Re: Re-inventing the JT65A messages for HF?
-Thanks Bill and Jose, I agree. Andy -- In digitalradio@yahoogroups.com, Jose A. Amador [EMAIL PROTECTED] wrote: No, I think it is not a good idea, at least so far. RRR, RO, and 73 are shorthand messages, no real text sent, but a combo of tones, and that has adventages at very low levels compared to real text. Watch the waterfall when you get called and when you get those shortand messages, 73, Jose, CO2JA __ V Conferencia Internacional de Energ�a Renovable, Ahorro de Energ�a y Educaci�n Energ�tica. 22 al 25 de mayo de 2007 Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/cier Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu
[digitalradio] DominoEX Needs Programmer.
Would you like to see DominoEX in MIXW? * We need an experienced Windows sound card programmer capable of working with Microsoft MFC and the free Microsoft C compiler in order to build a definitive DominoEX DLL for MIXW. * We can offer all documentation and source code for a fully working program (ZL2AFP's version), as well as source and compiled DLL for a preliminary (limited but semi-working) DLL written by Denis UU9JDR of the MIXW team. You can expect support from ZL1BPU, ZL2AFP and UU9JDR. The FEC details are available from F6CTE - the FEC coding technique is identical to MFSK16. * If you believe you have the skills and are prepared to build an open source freely available DLL compatible with MIXW, please contact ZL1BPU. http://www.qsl.net/zl1bpu/DOMINO/Index.htm
[digitalradio] Alabama MARS has changed to MT63
I saw a MARS message that says MARS in Alabamba (a USA state) has switched to MT63. Does anyone know when they are active in this mode ? Andy K3UK
[digitalradio] Digital mode interfaces, which ones ?
I wonder if we can get some general updates about the commercially available digital mode interfaces available today? Microham, Rigblaster, and SignaLink are among the best known but I wonder what is available at the low end? If a new ham wanted a simple one, one that was well isolated and performed basic rig control only ( no internal soundcards, no Winkey chips, etc) , what is out there? Is there anything under 40 Euros? I'm happy with mine but I am a little out of date on this topic. -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
[digitalradio] Norway propagation on 20M
Northern Europe to Eastern USA is opening up on 20M at 1126 UTC. 112600 8 -12 0.0 -19 2 * CQ LA5VNA JO591 0 112800 13 -11 0.0 -19 2 * CQ LA5VNA JO591 0 113000 7 -17 0.1 -22 3 * K3UK LA5VNA JO59 1 0 113200 10 -21 -21 2 RO ? 113600 10 -19 -23 3 RRR ? A lot of folks look for the best SNR but I am fascinated by the worst. In the above exchange, -21dB worked , at least for one brief exchange. -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
[digitalradio] K3UK
Hi Andy You were extremely weak . Only one time I was able to hear you. This is what I captured: 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 113100 2 -25 -0.4 22 3 # LA5VNA K3UK FN02OOO 1 0 113300 2 -3022 2 RO 113500 0 -29 6.90 51 I didn't get the RRR so that means the QSO is not accepted ? 73 la5vna Steinar
Re: [digitalradio] free text in JT65A
Andy, I responded manually, waiting to see what the person said before I replied. .I all sow use this work around yesterday , but then somebody start typing use Auto . If I only had this 10 sec , it had helped me a lot. Even a slow writer like me would be able print something sensible. Steinar LA5VNA Andrew O'Brien wrote: A good question Steinar. I sometimes will write some free text but not in direct response to the line that just popped up on my screen, usually I am just adding something like TU Steinar es 73 from NY . I am not asking questions like how is the weather in Norway? Last night, because of the situation you described, I did the opposite of what Chris suggested. I responded manually, waiting to see what the person said before I replied. This results in me starting the transmission 10 seconds , or so, late. The transmission ends on time, so I am not sure what real impact my 10 second late transmission has on anything. Andy k3UK On 4/6/07, Steinar Aanesland [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: Hi all, Some of you are typing long massages in a JT65A qso on HF and I wonder how you do that. Chris N2YYZ wrote Always click the Auto is OFF button to make it so Auto is ON. but when Auto is ON is on there is no way I am able to type in a text. I simply don't have time. Few seconds after decoding a signal the auto transmission kicks in, and my Norwegian brain is to slow. My head will never be able to translate from Norwegian into English, and get something understandable on the air when the time is sow extreme limited. I hope this was understandable;) Is there a trick here I'm missing? 73 de LA5VNA Steinar -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com http://www.obriensweb.com
Re: [digitalradio] Alabama MARS has changed to MT63
That's correct. Alabama Navy MARS for some years now, and many other states both Army and Navy use MT-63 for net traffic. It is far superior to any other method we've found. Bill KB4IJ - Original Message - From: Andrew O'Brien To: digitalradio@yahoogroups.com Sent: Friday, April 06, 2007 6:22 AM Subject: [digitalradio] Alabama MARS has changed to MT63 I saw a MARS message that says MARS in Alabamba (a USA state) has switched to MT63. Does anyone know when they are active in this mode ? Andy K3UK
[digitalradio] ADDITIONAL TIPS FOR USING JT65 IN WSJT VERSION 5.9.2
From W7GJ ADDITIONAL TIPS FOR USING JT65 IN WSJT VERSION 5.9.2 * TUTORIAL. Study the new tutorial at http://pulsar.princeton.edu/~joe/K1JT/Tutorial_590.txt * DEMO. K1JT has provided DEMO files on his website, so you can practice decoding actual .wav files. There are three secrets to success in learning how to efficiently and accurately use the JT65 software to decode weak signals: 1. PRACTICE 2. PRACTICE 3. PRACTICE You can often find local stations willing to practice with you, by going to http://www.chris.org/cgi-bin/jt65eme Please remember that it is NOT NECESSARY to have a computer interface just to practice receiving files! Just run audio from the receiver headphone jack to the LINE INPUT on the computer sound card jack, download the software and have at it! Practice makes perfect! * GRID LOCATOR ENTRY. Make sure you type your grid locator with the last two letters in LOWER CASE (for example, DN27ub) when you enter it in the SETUP/OPTIONS pull down. * SPECJT WATERFALL. Some of the big changes in the new JT65 include the fact that WSJT now includes its own improved waterfall display, so that it is not necessary to watch SPECTRAN to see the weak signals. There are three sliders along the bottom of the SPECJT screen, as well as options along the top. I set mine as follows: I select OPTIONS/FREQUENCY AXIS and OPTIONS/PALETTE/LINRAD. I set the speed to 3. The BRIGHTNESS slider (at the bottom left) is set approximately in the middle of its range. The CONTRAST slider (just to the left of center at the bottom) is set slightly to the right of center. The DIGITAL GAIN slider (on the right bottom) is set so JT65 displays a level between zero and +2 dB. With the proper settings, the SPECJT screen should show some faint yellow snow over the 1200-1500Hz range with no signals present. * SOUND CARD CORRECTION. With the new version, it also is possible to enter sound card correction factors for the input and outgoing audio. The suggested correction factors are displayed in the lower left corner of the JT65 screen for the particular sound card being used in your computer. This is a big improvement, especially for laptop computers (whose sound cards were often not so accurate). Make sure to enter the correction values displayed, by typing them in under the SETUP/OPTIONS/ (under Rate in and Rate out). * COMPUTER CLOCK. Note that you will still have to set your computer clock accurately, although the new version allows for twice as much error in your timing. If you do not have a connection to the internet while you are on the air (so you can automatically update the computer clock using DIMENSION 4 or a similar program), or do not have a GPS unit automatically updating your computer clock, you should try to manually set it within a second or two of the correct time by listening to WWV. * WEAK CW DISPLAY. Note that you can also use the SPECJT screen while you are in the JT65 MONITOR mode to display weak CW signals. Additional notes on CW EME can be found on my web page under note #10. Note that on CW, the signals will be ZERO BEAT on the operating frequencies specified. Also, remember what contitutes a contact. One station must receive final RRR - then contact is complete. The way a contact progresses (either CW or JT65) is listed under the HELP button (or just press F5) on the JT65 screen. You must ALTERNATE the messages through the contact to efficiently make it work. First station sends calls, second station sends calls and OOO, first station sends RO, second station sends RRR. It is NOT efficient (and often not successful) if one station simply parrots what they have been receiving. * DECODE PULL DOWN SETTINGS. You should make sure that DECODE/JT65 is set for EXHAUSTIVE. If you have a fast computer, you don't need to check anything else under that category. Only if your computer seems to take a long time to decode (at the end of a receive sequence), you can try changing the setting to DECODE/JT65/FAST or DECODE/JT65/NORMAL. Make sure you do not have the DECODE/JT65 AGGRESSIVE ever checked! That will give you a high percentage of false decodes, and is only for VERY experienced users who are carefully watching the DT and DF to determine whether the decodes are real or false. * SAVE DECODED. If you have space on your computer, I would suggest always saving your decoded .wav files as documentation of your contacts. You can do this under the SAVE/DECODED button at the top (I would NOT suggest checking SAVE/ALL). * MESSAGE SELECTION. Once the XMIT sequence begins, you can't change messages #1 or #2, so make sure you decode the incoming message and select the appropriat outgoing message before your XMIT period begins! You CAN switch to the shorthand messages of RO, RRR and 73, if that is appropriate, anytime by pressing the little button to the right of the messages. *FALSE DECODES. If you see a weak (low sync and dB values) station calling you
Re: [digitalradio] Alabama MARS has changed to MT63
Bill, What other digital modes did you compare it to and why did you find MT-63 superior? 73, Rick, KV9U Bill Ayer wrote: That's correct. Alabama Navy MARS for some years now, and many other states both Army and Navy use MT-63 for net traffic. It is far superior to any other method we've found. Bill KB4IJ
[digitalradio] Using the SpecJT to aide in tuning
I got a couple of useful tips today, played around a little and thought I would pass a long some information to fellow JT65A rookies. Some of you will have seen the OOO, RO, RRR info pop up on the waterfall, I figured there was a a reason for that. If you line things up with the position on the waterfall, it will aide in decoding and keep the frequency difference to a minimum. Having a wide DF is viewed as undesirable and results in the frequency being hogged. Enter the SPECJT. I had no clue about this display other than it looked cool. By it's self it appeared to do nothing. However if you have SPECJT and the WJST waterfall on the screen at the same time, you will notice SPECT responds to clicks on the WJTS mains screen waterfall.I am told that a good precise frequency can be achieved by sync'ing with the tones. the sync tone would be at 0, and the three red lines will be in the RO/RRR/73 positions...easy to decode even if timing off. The lowest tone is always the sync tone, even when sending the SH messages (WD4KPD David) and Mike VE3FGU added .. left most green line on the sync tone .. So, it seems that our goal should be to find the sync tone, align it with the left most green line by clicking on in in the JT65A waterfall and getting the RO/OOO stuff within the three RED lines on SPECJT. The band had died here, so will have to do more experimenting with this later today. Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
Re: [digitalradio] K3UK
I have been getting both sides of this qso. Unfortunately i have no 20mx antenna, using a 10mx verticle to receive. Theres been a lot of activity on today from around the world the northern hemisphere stations are coming in this evening. I've tried JT6M on 10mx across australia , that goes good as well. Good DX, Peter of87jr Perth, Western Australia Andrew O'Brien wrote: Yes, not a good contact. Sorry but glad we got a little close. Andy. On 4/6/07, *Steinar Aanesland* [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: Hi Andy You were extremely weak . Only one time I was able to hear you. This is what I captured: 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 113100 2 -25 -0.4 22 3 # LA5VNA K3UK FN02 OOO 1 0 113300 2 -30 22 2 RO 113500 0 -29 6.9 0 51 I didn't get the RRR so that means the QSO is not accepted ? 73 la5vna Steinar -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com http://www.obriensweb.com avast! Antivirus http://www.avast.com: Inbound message clean. Virus Database (VPS): 000730-4, 05/04/2007 Tested on: 6/04/2007 9:15:30 PM avast! - copyright (c) 1988-2007 ALWIL Software. --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 000730-4, 05/04/2007 Tested on: 6/04/2007 9:26:32 PM avast! - copyright (c) 1988-2007 ALWIL Software. http://www.avast.com
[digitalradio] Re: K3UK
--Peter, interesting to know that Steinar and I were both heard in WA, too bad you could not join us. Tell us more about your 10 metre tests within Australia. Andy K3UK - In digitalradio@yahoogroups.com, Peter L. Jackson [EMAIL PROTECTED] wrote: I have been getting both sides of this qso. Unfortunately i have no 20mx antenna, using a 10mx verticle to receive. Theres been a lot of activity on today from around the world the northern hemisphere stations are coming in this evening. I've tried JT6M on 10mx across australia , that goes good as well. Good DX, Peter of87jr Perth, Western Australia Andrew O'Brien wrote: Yes, not a good contact. Sorry but glad we got a little close. Andy. On 4/6/07, *Steinar Aanesland* [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: Hi Andy You were extremely weak . Only one time I was able to hear you. This is what I captured: 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 113100 2 -25 -0.4 22 3 # LA5VNA K3UK FN02 OOO 1 0 113300 2 -30 22 2 RO 113500 0 -29 6.9 0 51 I didn't get the RRR so that means the QSO is not accepted ? 73 la5vna Steinar -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com http://www.obriensweb.com avast! Antivirus http://www.avast.com: Inbound message clean. Virus Database (VPS): 000730-4, 05/04/2007 Tested on: 6/04/2007 9:15:30 PM avast! - copyright (c) 1988-2007 ALWIL Software. --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 000730-4, 05/04/2007 Tested on: 6/04/2007 9:26:32 PM avast! - copyright (c) 1988-2007 ALWIL Software. http://www.avast.com
Re: [digitalradio] K3UK
I have been getting both sides of this qso. Unfortunately i have no 20mx antenna, using a 10mx verticle to receive. Theres been a lot of activity on today from around the world the northern hemisphere stations are coming in this evening. I've tried JT6M on 10mx across Australia , that goes good as well. Once Simon HB9DRV puts the WSJT code into the DM780 the sky's the limit. Good DX, Peter of87jr Perth, Western Australia Andrew O'Brien wrote: Yes, not a good contact. Sorry but glad we got a little close. Andy. On 4/6/07, *Steinar Aanesland* [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: Hi Andy You were extremely weak . Only one time I was able to hear you. This is what I captured: 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 113100 2 -25 -0.4 22 3 # LA5VNA K3UK FN02 OOO 1 0 113300 2 -30 22 2 RO 113500 0 -29 6.9 0 51 I didn't get the RRR so that means the QSO is not accepted ? 73 la5vna Steinar -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com http://www.obriensweb.com avast! Antivirus http://www.avast.com: Inbound message clean. Virus Database (VPS): 000730-4, 05/04/2007 Tested on: 6/04/2007 9:15:30 PM avast! - copyright (c) 1988-2007 ALWIL Software. --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 000730-4, 05/04/2007 Tested on: 6/04/2007 9:37:24 PM avast! - copyright (c) 1988-2007 ALWIL Software. http://www.avast.com
Re: [digitalradio] Alabama MARS has changed to MT63
Rick, We had previously used AMTOR FEC for net traffic. We tried BPSK MFSK as I remember, and probably some others. More recently also Olivia. MT-63 seldom fails even under noisy conditions. I can copy it on my mobile radio with laptop sitting on the seat with no wire connections at alland my old Explorer generates considerable RF and road noise of it's own. Under fair to good conditions we use 2000 Hz bandwidth (not a problem on MARS channels) which is about four times faster and more much more reliable than AMTOR. For broadcast messages our standard is 1000Hz bandwidth. When things get too bad for voice communication, 500 Hz will still generally get through. Bill KB4IJ - Original Message - From: kv9u To: digitalradio@yahoogroups.com Sent: Friday, April 06, 2007 7:59 AM Subject: Re: [digitalradio] Alabama MARS has changed to MT63 Bill, What other digital modes did you compare it to and why did you find MT-63 superior? 73, Rick, KV9U Bill Ayer wrote: That's correct. Alabama Navy MARS for some years now, and many other states both Army and Navy use MT-63 for net traffic. It is far superior to any other method we've found. Bill KB4IJ
Re: [digitalradio] free text in JT65A
On 4/6/07, Steinar Aanesland [EMAIL PROTECTED] wrote: Some of you are typing long massages in a JT65A qso on HF and I wonder how you do that. Chris N2YYZ wrote Always click the Auto is OFF button to make it so Auto is ON. but when Auto is ON is on there is no way I am able to type in a text. I simply don't have time. Few seconds after decoding a signal the auto transmission kicks in, and my Norwegian brain is to slow. My head will never be able to translate from Norwegian into English, and get something understandable on the air when the time is sow extreme limited. I hope this was understandable;) Is there a trick here I'm missing? Steinar, Usually when I put in a long message, I have it ready to go before my TX slot (e.g. 73 TNX! BEST-19). However, you can turn auto off, type your message, and then turn auto back on when you are done. You will begin TXing as soon as you turn it back on, and if only 10 or so seconds have passed, the other station should still be able to get a decode. I have noticed that TXing manually sometimes makes me TX past the end of my timeslot. Haven't figured that one out yet. Auto always seems to end at the right time, though. best 73, -chris N2YYZ
[digitalradio] JT6M on 10 MX
-Peter, interesting to know that Steinar and I were both heard in WA, too bad you could not join us. Tell us more about your 10 metre tests within Australia. Andy K3UK .. Hi Andy in reply to your query we in Australia rode the first wave of wsjt when it first came out. Not content to use it only on vhf a select few of us started to use it on HF, remember this was way back in 2005 ! I have cut and pasted off the logger the event. http://www.vklogger.com/forum/index.php Post http://www.vklogger.com/forum/viewtopic.php?p=54#54Posted: Sun Apr 10, 2005 10:58 amPost subject: WSJT contact between VK2KKR and VK6KXW on 10mx Reply with quote http://www.vklogger.com/forum/posting.php?mode=quotep=54 Just a short post to the forum members to advise a successful WSJT transmission on 10th April 28.334mhz took place at 00:05 to 01:00 between VK2KKR The Rock Hill, Sthrn NSW QF34MR and VK6KXW Perth OF88ab over a 2,837km path. The modes tried were JT6m, FSK441a, JT65 with the greastest success acheived on JT6m with decodes ranging from +2 to -15 at the Perth end. Equipment at the Perth end was a yaesu ft-1000mp mk5, 5/8 wavelength end fed vertical on top of the house roof. Both stations learn t from it and I look forward for many others. Well done Leigh. . Most of the vk/zl guys hang out on Adam Maurer's logger http://www.vklogger.com/ Here you will find the eme/digital guys for hf and vhf to arrange skeds, info etc. We tend to keep to ourselves in OZ even though there is only 9,000 hams they are of a high caliber. 73's Peter vk6kxw of87jr Perth, Western Australia --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 000730-4, 05/04/2007 Tested on: 6/04/2007 10:57:51 PM avast! - copyright (c) 1988-2007 ALWIL Software. http://www.avast.com
Re: [digitalradio] K3UK
Hi Peter, Great! I have been to Perth some years ago and it gives me therefor an extra good vibration to see that my signal reached your antenna :) This is what I am using: http://home.broadpark.no/~saanes/bilder/antenna.jpg Not a big thing as you can see ,but with my 100W it does the job :) . Hope to see you on 20m JT65A some times. 73 de LA5VNA Steinar Peter L. Jackson wrote: I have been getting both sides of this qso. Unfortunately i have no 20mx antenna, using a 10mx verticle to receive. Theres been a lot of activity on today from around the world the northern hemisphere stations are coming in this evening. I've tried JT6M on 10mx across australia , that goes good as well. Good DX, Peter of87jr Perth, Western Australia Andrew O'Brien wrote: Yes, not a good contact. Sorry but glad we got a little close. Andy. On 4/6/07, *Steinar Aanesland* [EMAIL PROTECTED] mailto:saanes%40broadpark.no mailto:[EMAIL PROTECTED] mailto:saanes%40broadpark.no wrote: Hi Andy You were extremely weak . Only one time I was able to hear you. This is what I captured: 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 112900 3 -24 -0.2 19 3 * LA5VNA K3UK FN02 1 0 113100 2 -25 -0.4 22 3 # LA5VNA K3UK FN02 OOO 1 0 113300 2 -30 22 2 RO 113500 0 -29 6.9 0 51 I didn't get the RRR so that means the QSO is not accepted ? 73 la5vna Steinar -- Andy K3UK Skype Me : callto://andyobrien73 callto://andyobrien73 www.obriensweb.com http://www.obriensweb.com http://www.obriensweb.com -- avast! Antivirus http://www.avast.com http://www.avast.com: Inbound message clean. Virus Database (VPS): 000730-4, 05/04/2007 Tested on: 6/04/2007 9:15:30 PM avast! - copyright (c) 1988-2007 ALWIL Software. --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 000730-4, 05/04/2007 Tested on: 6/04/2007 9:26:32 PM avast! - copyright (c) 1988-2007 ALWIL Software. http://www.avast.com http://www.avast.com
[digitalradio] j65
ok I need help. why is it that I can see the messages, and message numbers, time sent etc etc but I can't see any callsigns? Can copy RO and 73 etc etc at -29db on the waterfall and understand how those tones work. other people have been seeing me yet i can't copy a callsign.. Grrr! John VE5MU
Re: [digitalradio] DominoEX mode
I have not heard many comments about DEX, other than the ones that I have made. Has anyone being having some testing experiences? Good or bad? When I first tested it against other modes some time back, I was very disappointed in the performance. I suppose this is due in part to the expectation that if a new mode is created, it should be better in at least some ways to the existing modes. When Patrick employed FEC, this did make the mode perform better for my testing as long as the QRN levels were not too severe. Of course the speed was cut in half so that speeds much slower than 11 baud were not optimum for keyboarding. I really had high hopes that this was going to be a good general purpose mode as it is also easy to tune in and not too wide and has many speed choices. My recent experiments were again disappointing because it does not seem to perform well on the lower bands with high QRN plus severe static crashes. I wonder if we could develop some guidelines for which digital modes work best with different conditions? I like to think I have a feel for many of these modes, but I probably don't have a very accurate picture since there are so many variables. Or maybe there is something available that is more recent than the excellent UK critique that was made of several modes a few year ago? 73, Rick, KV9U Andrew O'Brien wrote: Would you like to see DominoEX in MIXW? * We need an experienced Windows sound card programmer capable of working with Microsoft MFC and the free Microsoft C compiler in order to build a definitive DominoEX DLL for MIXW. * We can offer all documentation and source code for a fully working program (ZL2AFP's version), as well as source and compiled DLL for a preliminary (limited but semi-working) DLL written by Denis UU9JDR of the MIXW team. You can expect support from ZL1BPU, ZL2AFP and UU9JDR. The FEC details are available from F6CTE - the FEC coding technique is identical to MFSK16. * If you believe you have the skills and are prepared to build an open source freely available DLL compatible with MIXW, please contact ZL1BPU. http://www.qsl.net/zl1bpu/DOMINO/Index.htm
Re: [digitalradio] j65
Your not alone John. I havent seen one all morning. Danny Douglas N7DC ex WN5QMX ET2US WA5UKR ET3USA SV0WPP VS6DD N7DC/YV5 G5CTB all DX 2-6 years each . QSL LOTW-buro- direct As courtesy I upload to eQSL but if you use that - also pls upload to LOTW or hard card. moderator [EMAIL PROTECTED] moderator http://groups.yahoo.com/group/DXandTalk - Original Message - From: John Bradley To: digitalradio@yahoogroups.com Sent: Friday, April 06, 2007 1:28 PM Subject: [digitalradio] j65 ok I need help. why is it that I can see the messages, and message numbers, time sent etc etc but I can't see any callsigns? Can copy RO and 73 etc etc at -29db on the waterfall and understand how those tones work. other people have been seeing me yet i can't copy a callsign.. Grrr! John VE5MU -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.26/748 - Release Date: 4/5/2007 3:33 PM
Re: [digitalradio] j65
Strange! It is crowded on 14.076 right now! 73 de LA5VNA Steinar Danny Douglas wrote: Your not alone John. I havent seen one all morning. Danny Douglas N7DC ex WN5QMX ET2US WA5UKR ET3USA SV0WPP VS6DD N7DC/YV5 G5CTB all DX 2-6 years each . QSL LOTW-buro- direct As courtesy I upload to eQSL but if you use that - also pls upload to LOTW or hard card. moderator [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] moderator http://groups.yahoo.com/group/DXandTalk http://groups.yahoo.com/group/DXandTalk - Original Message - *From:* John Bradley mailto:[EMAIL PROTECTED] *To:* digitalradio@yahoogroups.com mailto:digitalradio@yahoogroups.com *Sent:* Friday, April 06, 2007 1:28 PM *Subject:* [digitalradio] j65 ok I need help. why is it that I can see the messages, and message numbers, time sent etc etc but I can't see any callsigns? Can copy RO and 73 etc etc at -29db on the waterfall and understand how those tones work. other people have been seeing me yet i can't copy a callsign.. Grrr! John VE5MU No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.26/748 - Release Date: 4/5/2007 3:33 PM
[digitalradio] Fwd: ] Feld Hell Spring Sprint - 1st Day, 4/7/2007, 1:00 pm
-- Forwarded message -- From: [EMAIL PROTECTED] [EMAIL PROTECTED] Date: 6 Apr 2007 17:56:55 - Subject: [illinoisdigitalham] Feld Hell Spring Sprint - 1st Day, 4/7/2007, 1:00 pm To: [EMAIL PROTECTED] Reminder from: *illinoisdigitalham Yahoo! Grouphttp://groups.yahoo.com/group/illinoisdigitalham/cal * Title: Feld Hell Spring Sprint - 1st Day Date: Saturday April 7, 2007 Time: 1:00 pm - 11:00 pm Location: http://www.feldhellclub.org/Frequencies.htm Notes: http://www.feldhellclub.org/sprint%20spring%2007.htm Get reminders on your mobile, Yahoo! Messenger, and email. Edit reminder optionshttp://groups.yahoo.com/group/illinoisdigitalham/cal?v=75 Copyright (c) 2007 Yahoo! Inc. http://www.yahoo.com/ All Rights Reserved | Terms of Service http://docs.yahoo.com/info/terms/ | Privacy Policyhttp://privacy.yahoo.com/privacy/us -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
Re: [digitalradio] j65
No- I am not saying that I dont hear or see anything on the waterfall, I am not seeing any call signs print out. In fact, I am no longer even watching. Ive gone back to tyrying to work N8S. Danny Douglas N7DC ex WN5QMX ET2US WA5UKR ET3USA SV0WPP VS6DD N7DC/YV5 G5CTB all DX 2-6 years each . QSL LOTW-buro- direct As courtesy I upload to eQSL but if you use that - also pls upload to LOTW or hard card. moderator [EMAIL PROTECTED] moderator http://groups.yahoo.com/group/DXandTalk - Original Message - From: Steinar Aanesland [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Friday, April 06, 2007 2:08 PM Subject: Re: [digitalradio] j65 Strange! It is crowded on 14.076 right now! 73 de LA5VNA Steinar Danny Douglas wrote: Your not alone John. I havent seen one all morning. Danny Douglas N7DC ex WN5QMX ET2US WA5UKR ET3USA SV0WPP VS6DD N7DC/YV5 G5CTB all DX 2-6 years each . QSL LOTW-buro- direct As courtesy I upload to eQSL but if you use that - also pls upload to LOTW or hard card. moderator [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] moderator http://groups.yahoo.com/group/DXandTalk http://groups.yahoo.com/group/DXandTalk - Original Message - *From:* John Bradley mailto:[EMAIL PROTECTED] *To:* digitalradio@yahoogroups.com mailto:digitalradio@yahoogroups.com *Sent:* Friday, April 06, 2007 1:28 PM *Subject:* [digitalradio] j65 ok I need help. why is it that I can see the messages, and message numbers, time sent etc etc but I can't see any callsigns? Can copy RO and 73 etc etc at -29db on the waterfall and understand how those tones work. other people have been seeing me yet i can't copy a callsign.. Grrr! John VE5MU No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.26/748 - Release Date: 4/5/2007 3:33 PM Announce your digital presence via our DX Cluster telnet://cluster.dynalias.org Our other groups: http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/themixwgroup http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/wnyar http://groups.yahoo.com/group/Omnibus97 Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.26/748 - Release Date: 4/5/2007 3:33 PM
Re: [digitalradio] j65
I have not had it on all day till right now but, I'll keep en eye on it this afternoon. John, W0JAB At 01:48 PM 4/6/2007, you wrote: No- I am not saying that I dont hear or see anything on the waterfall, I am not seeing any call signs print out. In fact, I am no longer even watching. Ive gone back to tyrying to work N8S. Danny Douglas N7DC
Re: [digitalradio] Digital mode interfaces, which ones ?
One thing that confused me a bit was that the different claims of each interface make them appear to be quite good but they may neglect to mention that the interface only does part of what you may want. The main issues are: 1) Rig control through some kind of interface specific to that brand or model. Examples would be RS-232 that some rigs can connect to directly (but now need an USB to COM adapter for most computers), or for ICOM, CI-V control. 2) Switching the PTT either via the above, done through the interface, if it can support that, or via a separate PTT keying circuit. Some use the presence of audio out to trigger a circuit that can then, in turn, key the PTT, e.g., Tigertronics Signalink. Some can use the audio itself to key the radio through VOX, which I have done with older Kenwood and also Ten Tec rigs. Not possible with ICOM, unless using the microphone connector on the front panel. 3) Isolation of the audio lines, typically the Line In and Line Out. Most sound card outputs seem to be line level speaker outputs, but to actually drive a speaker would need to be amplified, thus they are actually a line level output and ideal for radio interfacing levels. Sometimes there is no Line In so you have to use Microphone In and this may require padding down the signal (example: notebook computers). 4) Keying of CW or FSK through special circuits. This is mostly available on the more expensive interfaces. The only units that combine the software control, the audio line isolation, and also the keying of CW and FSK, tend to be the more expensive units such as the microham. The price is very high at $300 or more and lately they seem to have increased a bit from the recent past. Not all interfaces always isolate both audio lines, e.g., some Rigblasters. There are some very low cost and simple interfaces for some rigs such as the ICOM or older Ten Tec rigs that use the CI-V, but you still have to come up with separate audio isolation and separate keying if you want CW or FSK and I find it difficult at times to sift and winnow through the advertising hype. The first thing to do would be to take stock of your rig(s) and determine what kind of interfacing is really required and go from there. I don't think that I have seen any low cost interfaces that can do both rig control and audio line isolation. Most of the lower cost ones will control PTT and isolate the audio lines. But your rig may not need a special interface for rig control if it can use an RS-232 serial connection. 73, Rick, KV9U Andrew O'Brien wrote: I wonder if we can get some general updates about the commercially available digital mode interfaces available today? Microham, Rigblaster, and SignaLink are among the best known but I wonder what is available at the low end? If a new ham wanted a simple one, one that was well isolated and performed basic rig control only ( no internal soundcards, no Winkey chips, etc) , what is out there? Is there anything under 40 Euros? I'm happy with mine but I am a little out of date on this topic.
Re: [digitalradio] Some notes on JT65-on-HF operation
Sergio Manrique Almeida wrote: I managed to run it on HTTP mode, as couldn’t find UDP ports to unblock on XP. Regards, Sergio, EA3DU -Mensaje original- I have used nistime-32 where firewalls do not block time synchronization. Works very well. At home, I am using F6CTE' s clock 1.6 (registered) and syncing to CHU whenever necessary and possible. 73, Jose, CO2JA __ V Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética. 22 al 25 de mayo de 2007 Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/cier Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu Announce your digital presence via our DX Cluster telnet://cluster.dynalias.org Our other groups: http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/themixwgroup http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/wnyar http://groups.yahoo.com/group/Omnibus97 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: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * 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] Notes on JT65-on-HF part deux: decoding signals
Hi all, My last message seemed to be modestly well-received, and since then I've received / seen a number of questions regarding decoding JT65 signals, so here's my stab at addressing those. Remember that I'm a newbie myself: I haven't even been playing around for WSJT for a whole week! Certainly don't hesitate to correct me if I say anything wrong, or to ask further questions. Anatomy of a JT65A signal Although JT65A is always a MFSK mode, there are two fundamental types of JT65A signals: the full text ones used to send CQs, exchange callsigns and signal reports, or any arbitrary text, and the shorthand signals used to send RO, RRR, and 73. Both kinds of messages have a sync tone and other tones -- in the case of full text messages, many other tones, and in the case of shorthand messages, just one other tone. However, the sync tone is always the tone lowest in frequency, and in my experience with HF operation, almost always between 1200 and 1300Hz (assuming you are tuned to the same frequency as the transmitting station). (For the sake of completeness, I should also note here that only one tone is transmitted at any given time, and that transitions between tones are done in a phase-continuous manner.) Note on full text messages: arbitrary text can be, at most, 13 characters. For those of you who have noticed that e.g. K3UK N2YYZ FN12 OOO is quite a bit longer than 13 characters, JT65 has a special compression scheme for common message components, like CQ, QRZ, OOO, and callsigns, which it uses in the standard exchanges. Decoding basics Start up WSJT. Make sure Freeze is unchecked. Examine the SpecJT window. You should see a long green bar at the top of your passband. This green bar represents the frequency range that WSJT will search for signals when it attempts a decode. That's right -- it attempts to decode anything it can find in that range (as long as the sync tone falls within the green bar, it should just work). This is a feature designed to make compensating for EME Doppler easy. If there's a signal that you can hear, or even that you cannot hear, WSJT should decode it. However, you will probably need to increase your Recording Settings line in/microphone slider to more than you use for other digital modes. The WSJT documentation states that the RX noise figure should be around 0dB while you are receiving just noise. I usually don't pump things up this high, but I do make sure it's above -10dB (the associated status indication turns red if this condition isn't met). If you can't use your soundcard's mixer to get things this high, the rightmost slider at the bottom of the SpecJT window is Digital gain and can increase audio levels more. (Aside: here's a point where I would appreciate feedback from others who have been successful. How high do you usually turn things up? Am I wrong here?) Also remember that you will not decode what you just heard until the full minute has passed (I said 52 seconds in my last message; a more accurate figure is something like 55 seconds). This is just due to the nature of the protocol: each JT65A transmission is sent as a single FEC'd block, which is one of the things that gives it the weak-signal abilities for which it is known. More advanced decoding There are a lot of knobs and buttons to play with on the WSJT decoder. I'll start with the more important ones... Clicking in the SpecJT window (or on the red line plot in the main window) will set the clicked frequency as the frequency of the sync tone. I'll reiterate that -- when you click on something in the waterfall, it should always be the leftmost sync tone! Once you've given WSJT a frequency value this way, you can check Freeze, which locks the search for the sync tone down to within Tol Hz of the frequency you selected. You can vary Tol by left or right-clicking on it. Watch the length of the green bar in the SpecJT window change as you do this. (Cool tip: in the cases where multiple stations have both transmitted in the same timeslot (with a slight frequency difference), I have often been able to decode both transmissions by setting Tol to 10, clicking one sync tone, decoding, and then clicking the other and decoding.) Once you've tuned a station, you should leave Freeze on. It gives you a little more sensitivity, (I think) decreases decode times slightly, and also makes the shorthand signals (RO/RRR/73) decode without question marks. Once you've clicked on the sync tone of a station, SpecJT also shows you helper red ticks on the frequency scale, that indicate where tones for RO, RRR, and 73 will be seen (from left to right). NB is what you'd expect -- some sort of noise blanking. I've left it on, but I'm not sure if it's actually necessary. Zap somehow attempts to zap away receiver birdies. I usually keep this off. Enabling either probably reduces sensitivity slightly. There's another feature of WSJT that is useful for very weak signals -- so weak that they can't be
Re: [digitalradio] Alabama MARS has changed to MT63
As a heavy user of AMTOR, mostly ARQ mode though, twenty years ago, I would have to say that this mode is not very robust. There were many times that the signals were still pretty good, but the mode would begin to allow errors to come through (it had a mediocre quality ARQ), or would completely stop any further throughput. The FEC mode is not that good either, but I suppose you wanted it for unconnected broadcasts. And it does not have upper and lower case ASCII code characters. BPSK is not very robust at all but works well under weak conditions if there is not too many difficulties with the ionosphere. I have had poor results with MT-63 working through severe QRN, but maybe we will have to revisit that mode again to do another comparison. I don't think that we tried the narrow 500 Hz version of MT-63. Maybe that would compete well against MFSK16/8 which so far has worked the best for us, even though a pain to get it tuned in. 73, Rick, KV9U Bill Ayer wrote: Rick, We had previously used AMTOR FEC for net traffic. We tried BPSK MFSK as I remember, and probably some others. More recently also Olivia. MT-63 seldom fails even under noisy conditions. I can copy it on my mobile radio with laptop sitting on the seat with no wire connections at alland my old Explorer generates considerable RF and road noise of it's own. Under fair to good conditions we use 2000 Hz bandwidth (not a problem on MARS channels) which is about four times faster and more much more reliable than AMTOR. For broadcast messages our standard is 1000Hz bandwidth. When things get too bad for voice communication, 500 Hz will still generally get through. Bill KB4IJ - Original Message - *From:* kv9u mailto:[EMAIL PROTECTED] *To:* digitalradio@yahoogroups.com mailto:digitalradio@yahoogroups.com *Sent:* Friday, April 06, 2007 7:59 AM *Subject:* Re: [digitalradio] Alabama MARS has changed to MT63 Bill, What other digital modes did you compare it to and why did you find MT-63 superior? 73, Rick, KV9U Bill Ayer wrote: That's correct. Alabama Navy MARS for some years now, and many other states both Army and Navy use MT-63 for net traffic. It is far superior to any other method we've found. Bill KB4IJ
[digitalradio] Re: Notes on JT65-on-HF part deux: decoding signals
Thanks for the information Chris. Very helpful and much appreciated. Happy Easter. 73, Tony, AD1Y --- In digitalradio@yahoogroups.com, Chris Danis [EMAIL PROTECTED] wrote: Hi all, My last message seemed to be modestly well-received, and since then I've received / seen a number of questions regarding decoding JT65 signals, so here's my stab at addressing those. Remember that I'm a newbie myself: I haven't even been playing around for WSJT for a whole week! Certainly don't hesitate to correct me if I say anything wrong, or to ask further questions. Anatomy of a JT65A signal Although JT65A is always a MFSK mode, there are two fundamental types of JT65A signals: the full text ones used to send CQs, exchange callsigns and signal reports, or any arbitrary text, and the shorthand signals used to send RO, RRR, and 73. Both kinds of messages have a sync tone and other tones -- in the case of full text messages, many other tones, and in the case of shorthand messages, just one other tone. However, the sync tone is always the tone lowest in frequency, and in my experience with HF operation, almost always between 1200 and 1300Hz (assuming you are tuned to the same frequency as the transmitting station). (For the sake of completeness, I should also note here that only one tone is transmitted at any given time, and that transitions between tones are done in a phase-continuous manner.) Note on full text messages: arbitrary text can be, at most, 13 characters. For those of you who have noticed that e.g. K3UK N2YYZ FN12 OOO is quite a bit longer than 13 characters, JT65 has a special compression scheme for common message components, like CQ, QRZ, OOO, and callsigns, which it uses in the standard exchanges. Decoding basics Start up WSJT. Make sure Freeze is unchecked. Examine the SpecJT window. You should see a long green bar at the top of your passband. This green bar represents the frequency range that WSJT will search for signals when it attempts a decode. That's right -- it attempts to decode anything it can find in that range (as long as the sync tone falls within the green bar, it should just work). This is a feature designed to make compensating for EME Doppler easy. If there's a signal that you can hear, or even that you cannot hear, WSJT should decode it. However, you will probably need to increase your Recording Settings line in/microphone slider to more than you use for other digital modes. The WSJT documentation states that the RX noise figure should be around 0dB while you are receiving just noise. I usually don't pump things up this high, but I do make sure it's above -10dB (the associated status indication turns red if this condition isn't met). If you can't use your soundcard's mixer to get things this high, the rightmost slider at the bottom of the SpecJT window is Digital gain and can increase audio levels more. (Aside: here's a point where I would appreciate feedback from others who have been successful. How high do you usually turn things up? Am I wrong here?) Also remember that you will not decode what you just heard until the full minute has passed (I said 52 seconds in my last message; a more accurate figure is something like 55 seconds). This is just due to the nature of the protocol: each JT65A transmission is sent as a single FEC'd block, which is one of the things that gives it the weak-signal abilities for which it is known. More advanced decoding There are a lot of knobs and buttons to play with on the WSJT decoder. I'll start with the more important ones... Clicking in the SpecJT window (or on the red line plot in the main window) will set the clicked frequency as the frequency of the sync tone. I'll reiterate that -- when you click on something in the waterfall, it should always be the leftmost sync tone! Once you've given WSJT a frequency value this way, you can check Freeze, which locks the search for the sync tone down to within Tol Hz of the frequency you selected. You can vary Tol by left or right-clicking on it. Watch the length of the green bar in the SpecJT window change as you do this. (Cool tip: in the cases where multiple stations have both transmitted in the same timeslot (with a slight frequency difference), I have often been able to decode both transmissions by setting Tol to 10, clicking one sync tone, decoding, and then clicking the other and decoding.) Once you've tuned a station, you should leave Freeze on. It gives you a little more sensitivity, (I think) decreases decode times slightly, and also makes the shorthand signals (RO/RRR/73) decode without question marks. Once you've clicked on the sync tone of a station, SpecJT also shows you helper red ticks on the frequency scale, that indicate where tones for RO, RRR, and 73 will be seen (from left to right). NB is what you'd expect -- some sort
Re: [digitalradio] Re: Reed Solomon Identifier
Vojtech, Thank you for figuring this out. I had thought that the mode ID was sent in the mode, and that all modes were decoded in parallel to see which one resulted in the ECC-protected key codeword. The advantage of senfing the mode ID using the mode itseld is that propagation characteristics that favor one mode over another will not cause failure to ID or the converse (copy of ID but failure to copy the actual transmission). All my questions had been with this belief in mind. 73, Leigh/WA5ZNU On Wed, 4 Apr 2007 8:24 pm, Vojtech Bubnik wrote: Hi Patrick. On Wed, 4 Apr 2007 8:24 pm, Vojtech Bubnik wrote: Hi Patrick. you send a heavily FEC protected keyword in the desired mode. you do a parallel decode of all modes, de-FEC all and look which one matches the the codeword ? Yes it is. But it is not only done for one frequency, it is done for all frequencies in the band. I played with MultiPSK and listened to the generated RS sequence. In my opinion it is always the same modulation. According to my ears and spectrogram it seems to be some kind of MFSK modulation, always the same number of tones and symbol speed. Please correct me, but I think there is a misunderstanding on the list. I suppose that the RS ID is very similar to Olivia, there are three differences though and I thing we have discussed it by personal e-mails. - Olivia uses Hadamard/Welsh transformation, RS uses Reed Solomon block code - Olivia is decoded parallel on a constraned band, RS is decoded parallel on the whole sound card spectrum. The channel separation is half tone. - RS code sends just one block with the mode ID. Olivia and RS decode both a lot of channels in parallel (at least the original Olivia code from Pawel Jalocha does that) and it selects the one, which gives highest correlation. This automatically gives the answer for other party frequency. I received the RS code from Patrick, but I did not add it to PocketDigi yet. I am busy now with firmware programming of ATS-3A, I hope to teach it to modulate the single tone modes by programming its DDS. It will be the ultimate portable digital set, hi. 73, Vojtech OK1IAK
Re: [digitalradio] ADDITIONAL TIPS FOR USING JT65 IN WSJT VERSION 5.9.2
Andrew O'Brien wrote: From W7GJ ADDITIONAL TIPS FOR USING JT65 IN WSJT VERSION 5.9.2 * TUTORIAL. Study the new tutorial at http://pulsar.princeton.edu/~joe/K1JT/Tutorial_590.txt Got a 404 error on this link. Can someone tell the right one if not already outdated ? 73, Jose, CO2JA __ V Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética. 22 al 25 de mayo de 2007 Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/cier Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu
Re: [digitalradio] j65
Steinar Aanesland wrote: Strange! It is crowded on 14.076 right now! 73 de LA5VNA Steinar And on the sides too...I see quite a few that do not like to make lines until the frequency clears up. 73, Jose, CO2JA __ V Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética. 22 al 25 de mayo de 2007 Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/cier Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu
Re: [digitalradio] ADDITIONAL TIPS FOR USING JT65 IN WSJT VERSION 5.9.2
Try http://physics.princeton.edu/pulsar/K1JT/Documentation.htm 73, Chuck, AA5J At 03:41 PM 4/6/2007, Jose A. Amador wrote: * TUTORIAL. Study the new tutorial at http://pulsar.princeton.edu/~joe/K1JT/Tutorial_590.txthttp://pulsar.princeton.edu/~joe/K1JT/Tutorial_590.txt Got a 404 error on this link. Can someone tell the right one if not already outdated ? 73, Jose, CO2JA __ V Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética. 22 al 25 de mayo de 2007 Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/cierhttp://www.cujae.edu.cu/eventos/cier Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cuhttp://www.universidad2008.cu
Re: [digitalradio] ADDITIONAL TIPS FOR USING JT65 IN WSJT VERSION 5.9.2
Thank you, Chuck. That one works, but that tutorial seems to be outdated. I did not find it there. Nevertheless, I already copied all the pdf' s there. 73, Jose, CO2JA Chuck Mayfield wrote: Try http://physics.princeton.edu/pulsar/K1JT/Documentation.htm 73, Chuck, AA5J __ V Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética. 22 al 25 de mayo de 2007 Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/cier Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu
Re: [digitalradio] John VE5MU
I am back there tonight was on 20 for a short while saw a bunch of european stations and a ZL2 on a band that seems absolutely dead to any other mode John VE5MU - Original Message - From: Rick Westerfield To: digitalradio@yahoogroups.com Sent: Friday, April 06, 2007 5:48 PM Subject: RE: [digitalradio] John VE5MU Yes, and I saw him too on Thursday night about 9:30 or 10 Central time but I cannot get my rig to key. Rick -- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Andrew O'Brien Sent: Wednesday, April 04, 2007 8:53 PM To: digitalradio@yahoogroups.com Subject: [digitalradio] John VE5MU See you John on 7076 015100 9 -7 2.3 0 3 * VE5MU DO70 1 0 -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.26/748 - Release Date: 4/5/2007 3:33 PM
[digitalradio] JT65A on 40m
Hi, I am calling on 7076 USB 23:30 UTC. Copy me any one ? LA5VNA Steinar
Re: [digitalradio] Some notes on JT65-on-HF operation
I downloaded the utility yesterday. It works as advertised. The clock is right on the mark. Nice addition, just as you say. Looks like it will eliminate any problems regarding clock accuracy and JT65A. Howard W6IDS Richmond, IN - Original Message - From: Steinar Aanesland To: digitalradio@yahoogroups.com Sent: Friday, April 06, 2007 3:27 AM Subject: Re: [digitalradio] Some notes on JT65-on-HF operation Hi Dimension 4 is a nice little program to Always keep your clock synchronized(..)
[digitalradio] help prevent qrm
20m was a mess today, everyone planting on 076. this is not necessary ! try this... set in spectrum the jt65 DF axis option freeze the program to 0, with tol to 200 tune whichever station you wish to tune by shifting your dial to place the sync tone on 0 the 200cps tol will effectively give you a filter 400cps wide around the other stations rf freq and it will not decode anything outside the window, this eliminates lots of qrm to you. if you rig cant quite tune that close, when most of the other stations tones are withing that window you can re-freeze the idea is to not use a large DF and take up more space than needed, and spread everyone out a bit. 300cps is more than enough to ensure no qrm. daivd/wd4kpd
[digitalradio] Re: help prevent qrm
Echo... No need for everyone to be on the same exact freq..spread out abit. 200 Hz is usually enough. You can work multiple qso's at the same time if you watch the DF...but not if everyone is one the same freq during the same sequence.. 73 Bill N9DSJ --- In digitalradio@yahoogroups.com, David Michael Gaytko // WD4KPD [EMAIL PROTECTED] wrote: 20m was a mess today, everyone planting on 076. this is not necessary ! try this... set in spectrum the jt65 DF axis option freeze the program to 0, with tol to 200 tune whichever station you wish to tune by shifting your dial to place the sync tone on 0 the 200cps tol will effectively give you a filter 400cps wide around the other stations rf freq and it will not decode anything outside the window, this eliminates lots of qrm to you. if you rig cant quite tune that close, when most of the other stations tones are withing that window you can re-freeze the idea is to not use a large DF and take up more space than needed, and spread everyone out a bit. 300cps is more than enough to ensure no qrm. daivd/wd4kpd
Re: [digitalradio] help prevent qrm
Well Duh! THANKS David, I have been pulling my hair out tryin to figure the scale out based on earlier advice and low-and-behold I did not have DF Axis selected. NOW I see the zero on the scale. Now off to pratice some more. Andy K3UK On 4/6/07, David Michael Gaytko // WD4KPD [EMAIL PROTECTED] wrote: 20m was a mess today, everyone planting on 076. this is not necessary ! try this... set in spectrum the jt65 DF axis option freeze the program to 0, with tol to 200 tune whichever station you wish to tune by shifting your dial to place the sync tone on 0 the 200cps tol will effectively give you a filter 400cps wide around the other stations rf freq and it will not decode anything outside the window, this eliminates lots of qrm to you. if you rig cant quite tune that close, when most of the other stations tones are withing that window you can re-freeze the idea is to not use a large DF and take up more space than needed, and spread everyone out a bit. 300cps is more than enough to ensure no qrm. daivd/wd4kpd -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
[digitalradio] Re: Digital mode interfaces, which ones ?
If anyone is interested in a low cost interface, and is willing and able to stuff and solder a PC board, check out the Fox Delta SC-1 offered by Dinesh Dajjar VU2FD in India. http://www.foxdelta.com/products/soundcard.htm http://www.foxdelta.com/products/soundcard.htm It did cost $18 US plus $5 air mail to the states, but I see it has gone up to $28 + shipping. Still a inexpensive alternative, and it is fairly easy to construct. It has both input and output isolation, and also includes a OptoIsolator for PTT. I am very happy with mine, and the only hard part is installing it in an enclosure, which is not provided. 73 de KCÃPTO Les http://www.foxdelta.com/products/soundcard.htm --- In digitalradio@yahoogroups.com, kv9u [EMAIL PROTECTED] wrote: I don't think that I have seen any low cost interfaces that can do both rig control and audio line isolation. Most of the lower cost ones will control PTT and isolate the audio lines. But your rig may not need a special interface for rig control if it can use an RS-232 serial connection. 73, Rick, KV9U Andrew O'Brien wrote: I wonder if we can get some general updates about the commercially available digital mode interfaces available today? Microham, Rigblaster, and SignaLink are among the best known but I wonder what is available at the low end? If a new ham wanted a simple one, one that was well isolated and performed basic rig control only ( no internal soundcards, no Winkey chips, etc) , what is out there? Is there anything under 40 Euros? I'm happy with mine but I am a little out of date on this topic.
Re: [digitalradio] Using the SpecJT to aide in tuning
Well, all I can say is THANKS!, Andrew. Your little blurb about that Sync Tone did the trick. I was clueless about the real relationship between SpecJT and WSJT displays. I was on 7076 when a signal came up. I just clicked on what appeared to be the Sync Tone in WSJT and Voila! The slider on SpecJT suddenly moved to the signal I was seeing and topped astride it. Up until then I wasn't printing anything - after the slider moved, I printed a CQ and tried my hand at connecting with the station as shown below - it worked: 022700 4 -3 0.2 -196 3 * CQ W6SZ DM14 1 0 022800 1 -30 0.1 40 5 * 022900 6 -4 0.2 -196 3 * CQ W6SZ DM14 1 0 023100 7 -5 0.3 -196 3 * CQ W6SZ DM14 1 0 023300 5 -4 0.2 -196 3 * CQ W6SZ DM14 1 0 023500 6 -4 -0.9 -196 3 # W6IDS W6SZ DM14 OOO 1 0 023700 10 -5 -0.8 -196 3 # W6IDS W6SZ DM14 OOO 1 0 023900 9 -5 -0.8 -196 3 # W6IDS W6SZ DM14 OOO 1 0 024100 10 -16 -196 4 RO ? 024300 10 -18 -196 4 RRR ? 024500 10 -8 -196 4 73 ? 024600 5 -2842 2 73 ? 024700 9 -3 -0.8 -196 3 * TNX 1 0 Now, I have to admit I wasn't watching to see if everything lined up in WSJT as you described.I was too excited. All I did was click on that large pulse. After that contact, I found I was printing a whole bunch more than in previous days of testing: 024900 6 -4 -0.80 3 * CQ W6SZ DM14 1 0 025000 2 -14 -0.5 24 3 * HB9TLK K3UK FN02 1 0 025100 7 -2 -0.90 3 * CQ W6SZ DM14 1 0 025200 10 -1824 4 RO ? 025300 10 -14 -475 3 RRR ? 025400 10 -2025 5 RRR ? 025500 10 -10 -475 2 RRR ? 025600 10 -1925 0 73 ? 025700 10 -7 -475 4 73 ? 025800 0 -31 -1.5 -498 7 025900 4 -8 -1.9 -474 4 * K3UK HB9TLK JN47 1 0 03 0 -33 10.0 -388 41 030100 5 -13 -1.9 -474 4 * K3UK HB9TLK JN47 1 0 030200 0 -32 4.0 -719 2 030300 9 -12 -1.9 -474 4 * CQ HB9TLK JN471 0 Anyway, I broke the ice tonight. Still a bunch to put together but at least I accomplished something. That was neat! When making a contact, are we supposed to manually engage each of the TX1 - TX6 message keys in the proper sequence, or does it all happen automagically with the AUTO is ON engaged? I turned the AUTO to off during the exchanges because I noticed that I was going into transmit mode before the DECODING was done and I could see his transmission. Howard W6IDS Richmond, IN - Original Message - From: Andrew O'Brien To: digitalradio@yahoogroups.com Sent: Friday, April 06, 2007 8:11 AM Subject: [digitalradio] Using the SpecJT to aide in tuning I got a couple of useful tips today, played around a little and thought I would pass a long some information to fellow JT65A rookies. SNIP SNIP Enter the SPECJT. I had no clue about this display other than it looked cool. By it's self it appeared to do nothing. However if you have SPECJT and the WJST waterfall on the screen at the same time, you will notice SPECT responds to clicks on the WJTS mains screen waterfall. I am told that a good precise frequency can be achieved by sync'ing with the tones. the sync tone would be at 0, and the three red lines will be in the RO/RRR/73 positions...easy to decode even if timing off. The lowest tone is always the sync tone, even when sending the SH messages (WD4KPD David) SNIP SNIP So, it seems that our goal should be to find the sync tone, align it with the left most green line by clicking on in in the JT65A waterfall and getting the RO/OOO stuff within the three RED lines on SPECJT.
Re: [digitalradio] Re: QSL for 7.076 JT65A QSO
Great work Ed ! On 4/6/07, KT2Q [EMAIL PROTECTED] wrote: Nice to work you Ed -- good luck with JT65 de KT2Q Tony Many tnx for being my 1st 40m JT65A QSO I was running 15w to indoor 20m dipole 7April 2007 7.076 023300 5 -13 0.6 -3 3 * CQ KT2Q FN30 1 0 023500 16 -10 0.5 -3 3 * CQ KT2Q FN30
Re: [digitalradio] Using the SpecJT to aide in tuning
Yeah , good news Howard. Your question about manual transmit is an interesting one. It appears to be expected that one does it automatically, auto on , and you manually select the message to send at each over. However, I have the same problem as you, the message is not decoded until its time for me to transmit automatically. Supposedly, those with faster computer will get a full decode several seconds before the top of the minute, but I do not. So , on several occasions I have manually responded because sometimes the person is not coming back to me. I select the message I am expecting to send, wait to see what they sent and click on the message TX manually. If I get it out within 5-7 seconds after the minute, I don;t seem to have any problems. An alternative is to rely on the auto TX and let it transmit your next message, and just stop TX if they are not coming back to you. I have to scratch my heard some more and think about this. When I manually send, the software stops at the right time and then starts again immediately. When that happens, I don't worry, I just press the stop TX button quickly. Andy K3UK On 4/7/07, w6ids [EMAIL PROTECTED] wrote: Well, all I can say is THANKS!, Andrew. Your little blurb about that Sync Tone did the trick. I was clueless about the real relationship between SpecJT and WSJT displays. I was on 7076 when a signal came up. I just clicked on what appeared to be the Sync Tone in WSJT and Voila! The slider on SpecJT suddenly moved to the signal I was seeing and topped astride it. Up until then I wasn't printing anything - after the slider moved, I printed a CQ and tried my hand at connecting with the station as shown below - it worked: 022700 4 -3 0.2 -196 3 * CQ W6SZ DM14 1 0 022800 1 -30 0.1 40 5 * 022900 6 -4 0.2 -196 3 * CQ W6SZ DM14 1 0 023100 7 -5 0.3 -196 3 * CQ W6SZ DM14 1 0 023300 5 -4 0.2 -196 3 * CQ W6SZ DM14 1 0 023500 6 -4 -0.9 -196 3 # W6IDS W6SZ DM14 OOO 1 0 023700 10 -5 -0.8 -196 3 # W6IDS W6SZ DM14 OOO 1 0 023900 9 -5 -0.8 -196 3 # W6IDS W6SZ DM14 OOO 1 0 024100 10 -16 -196 4 RO ? 024300 10 -18 -196 4 RRR ? 024500 10 -8 -196 4 73 ? 024600 5 -28 42 2 73 ? 024700 9 -3 -0.8 -196 3 * TNX 1 0 Now, I have to admit I wasn't watching to see if everything lined up in WSJT as you described.I was too excited. All I did was click on that large pulse. After that contact, I found I was printing a whole bunch more than in previous days of testing: 024900 6 -4 -0.8 0 3 * CQ W6SZ DM14 1 0 025000 2 -14 -0.5 24 3 * HB9TLK K3UK FN02 1 0 025100 7 -2 -0.9 0 3 * CQ W6SZ DM14 1 0 025200 10 -18 24 4 RO ? 025300 10 -14 -475 3 RRR ? 025400 10 -20 25 5 RRR ? 025500 10 -10 -475 2 RRR ? 025600 10 -19 25 0 73 ? 025700 10 -7 -475 4 73 ? 025800 0 -31 -1.5 -498 7 025900 4 -8 -1.9 -474 4 * K3UK HB9TLK JN47 1 0 03 0 -33 10.0 -388 41 030100 5 -13 -1.9 -474 4 * K3UK HB9TLK JN47 1 0 030200 0 -32 4.0 -719 2 030300 9 -12 -1.9 -474 4 * CQ HB9TLK JN47 1 0 Anyway, I broke the ice tonight. Still a bunch to put together but at least I accomplished something. That was neat! When making a contact, are we supposed to manually engage each of the TX1 - TX6 message keys in the proper sequence, or does it all happen automagically with the AUTO is ON engaged? I turned the AUTO to off during the exchanges because I noticed that I was going into transmit mode before the DECODING was done and I could see his transmission. Howard W6IDS Richmond, IN - Original Message - From: Andrew O'Brien To: digitalradio@yahoogroups.com digitalradio%40yahoogroups.com Sent: Friday, April 06, 2007 8:11 AM Subject: [digitalradio] Using the SpecJT to aide in tuning I got a couple of useful tips today, played around a little and thought I would pass a long some information to fellow JT65A rookies. SNIP SNIP Enter the SPECJT. I had no clue about this display other than it looked cool. By it's self it appeared to do nothing. However if you have SPECJT and the WJST waterfall on the screen at the same time, you will notice SPECT responds to clicks on the WJTS mains screen waterfall. I am told that a good precise frequency can be achieved by sync'ing with the tones. the sync tone would be at 0, and the three red lines will be in the RO/RRR/73 positions...easy to decode even if timing off. The lowest tone is always the sync tone, even when sending the SH messages (WD4KPD David) SNIP SNIP So, it seems that our goal should be to find the sync tone, align it with the left most green line by clicking on in in the JT65A waterfall and getting the RO/OOO stuff within the three RED lines on SPECJT. -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
