[digitalradio] WSJT / JT4 Sample Rate / Timing issues - solved

2009-08-15 Thread ac.tal...@btinternet.com
During the tests on 10GHz and 1.3GHz using JT4G mode last month, a few people reported difficulty with decoding the data in spite of a good S/N. In some cases the problem was solved by setting the clock properly, but not always... After modifying the GB3SCX 10GHz beacon yesterday to send

[digitalradio] Re: JT65B and C versus JT65A

2009-06-27 Thread ac.tal...@btinternet.com
You'll probably find JT65C is needed on the UHF bands, 432 to 2.3GHz for example, to allwo for teh frequency spreading Doppler - abnd certainly for EME for which it was designed. Conversely, at LF, 137 / 503kHz, teh A varient is satisfactory and only consumes half teh bandwidth. Andy

[digitalradio] Re: JT65B and C versus JT65A

2009-06-27 Thread ac.tal...@btinternet.com
the the the the the and allow Must learn to check before hitting 'send' ! Andy www.g4jnt.com --- In digitalradio@yahoogroups.com, ac.tal...@... ac.tal...@... wrote: You'll probably find JT65C is needed on the UHF bands, 432 to 2.3GHz for example, to allwo for teh frequency spreading