I use data a at 50 hz all the time
KD8NNU Sent from my Palm Pre on the Now Network from Sprint On Jun 2, 2011 2:06 PM, Rich - K1HTV <k1...@comcast.net> wrote: Jim, If you want to try JT65A on the Magic Band, the agreed upon calling frequency is 50.276 MHz. Almost all 6M JT65 signals that I've seen have been using JT65A. Congrats on taking the first step working this mode. I have found that on the super weak signals (less -20dB), stronger signals in a 2.5KHz pass band can push already weak signals farther into the noise to the point that they can not be copied. That's where the 3M's Hi-Cut and Lo-Cut controls come in handy. If you view a very weak trace on the JT65HF waterfall in the presence of loud (0 to -5 dB) signals, then tighten the filters you will see the weaker trace improve (get thicker). I only wish that the K3 filter (Hi, Low and BW) adjustment increment could be reduced from the present 100Hz to 50Hz or even 25Hz. This would allow the attenuation of QRM from very loud signals that are very near in frequency to very weak ones without affecting the weak signal's data. I hope that this suggestion could be considered in a future K3 firmware update. Have fun with JT65 as you watch the paint dry :-). 73, Rich - K1HTV = = = -----Original Message----- From: Jim Brown [mailto:j...@audiosystemsgroup.com] Sent: Wednesday, June 01, 2011 13:20 PM To: elecraft@mailman.qth.net Subject: [Elecraft] Clock Sync and JT65A On 6/1/2011 8:43 AM, Mike Markowski wrote: > Don't forget NTP (Network Time Protocol), the widely used standard > described in an RFC. It has been ported to Windows and is free. For many years, I've used a clock setting program distributed by NIST called nisttime. It can use NTP. Google to find it. Free download from nist.gov It can be set to do a re-sync as often as you like. I don't know how good it is at compensating for network delays, but it thinks its setting the clock to an accuracy of tens of msec. To get that level of accuracy you need to use it 2-3 times in succession. All this talk about WSPR and JT65 motivated me to download, install, and study the doc for both Joe Taylor's software and W6CQZ's HF version. Made my first contacts last night on 10139 kHz with VK and ZL running about 25W to the K3 and an 80M dipole. A JT65 contact is sorta like watching paint dry, but I couldn't even hear the ZL that I worked, and there was a lot of other activity within the passband that the software worked around. I'm convinced that the W6CQZ version is the way to go for HF work. Next step is to figure out how to use JT65A during 6M openings. Is there a calling frequency where everyone sets up shop on 6M in North America? Which modulation scheme(s) are most used for E-skip? 73, Jim Brown K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
