See: the general site for the JT65-HF Comfort branch of software. Joe is not sure that he will continue with JT65-HF, and so someone has stepped up to start moving forward with a branch of development code-named "Comfort". NEW: JT65-HF-Comfort is a new branch of development of JT65-HF.NEW: Yet another branch of JT65-HF, by DL4OCE - this one works with Ham Radio Deluxe.NEWEST: JT65-HF HB9HQX-Edition by Beat Oehrli, HB9HQX is another newer branch of development of JT65-HF.
#Jt65 hf hb9hqx edition update#
I will update this list as soon as a new consensus is reached. Discussion is currently underway to resolve an issue with using 24920 kHz (PSK-31 since 1999). THIS IS A PENDING ISSUE: Those amateur radio operations in Region 3 must operate at 24920 to 24929. NOTE 3: Per discussion amongst the JT65A crowd on the reflectors: There is discussion about moving the 12-meter window frequency, USB to 24927. I will update this when new information is available. This issue with the frequency problem between IARU regions needs to be resolved. However, most JT65A appears to be shifting to 101378 for a window (dial) frequency. This, of course, is an issue with certain countries/regions where digital operation is not allowed below 10140 kHz. * Note 2 * It is becoming a standard practice on 30m to actually use 101378 kHz as the window frequency (USB), to play 'nice' with WSPR stations. * Note 1 * Do not use 10145-10150kHz because JT65A is NOT COMPATIBLE with PSK31, MFSK, or RTTY and the other fast time-sharing modes such as PACTOR, ALE, PSKmail, and APRS. Here is a list of common JT65A frequencies: Freq kHz / Sideband / Note Also, be sure that there is no RF getting back into the audio chain, and the transmitted signal, as this causes the same problem: spurs and interference. If you have the volume too high, you will cause the audio to be distorted, leading to the transmission of spurs and 'garbage', which causes interference. REMINDER: Please be careful on how you adjust your OUTPUT volume on your soundcard/interface to your transmitter. How much power do you really need to transmit, with JT65A? Here is a calculator to help you figure that out, based on the reports you receive from other JT65A stations. THIS MODE IS DESIGNED FOR WEAK-SIGNAL DETECTION AND SUCCESSFUL TWO-WAY COMMUNICATION! However, it is also true that under many conditions on most HF bands, it is often demonstrated that lower power has been sufficient to accomplish amazing results. It is true that on some bands, under certain propagation conditions, the contact can only be accomplished with 100 watts of power. They only increase the power if no contact is made! You simply should NOT be running 100 watts, UNLESS YOU ABSOLUTELY HAVE TO! By running at 100 or greater power, you MAY cause intense interference to all of the other stations on the same frequency, countering any possible benefit of using this mode! DO NOT RUN HIGH POWER UNLESS YOU KNOW FOR CERTAIN THAT YOU CANNOT COMPLETE THE TWO-WAY CONTACT WITHOUT LOWER POWER! USE ONLY THE POWER NECESSARY TO COMPLETE THE CONTACT! The method suggested is to start all calls with lower power, and only increase the power if you must. Many amateur radio operators have worked the world with a simple dipole antenna and 20 watts. This is a WEAK-SIGNAL digital mode! - You should not run much power, at all. Join the Facebook community for JT65A here:, while the Discussion Group on Facebook for JT65A is here. It was later realized that this protocol, with some adaptation, would also be very usable for terrestrial HF communications. JT65 includes error-correcting features that make it very robust, even with signals much too weak to be heard. JT65A is actually a "sub-mode" of Joe's original JT65 protocol, which he designed to optimize EME contacts on the HF and VHF bands. Joe has contributed to the amateur radio community in much the same way, changing the playing field for weak-signal operation. Joe, a Professor Emeritus of physics at Princeton University, shares a Nobel Prize with Russell Alan Hulse (ex-WB2LAV) for the discovery of the first pulsar in a binary system as well as the first confirmation of the existence of gravitational radiation in the amount and with the properties first predicted by Albert Einstein. The JT65A communications protocol was conceived and first implemented by Joe Taylor, K1JT. Have you ever wondered how much of the noise you hear on the HF bands is actually comprised of signals too weak to be copied? JT65A is a weak-signal digital mode that allows you to pull great DX out from under the noise on the high frequency spectrum. Introduction to a weak-signal digital mode Welcome to the JT65A Digital Mode for High Frequency Weak Signal Communications.
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