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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