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 >
