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
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] 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/
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(..)
