JT65A/JT65/JT65-HF mode is normally used on HF, MF, LF and 6 meter bands. The system allows approximately +/-600Hz auto-tuning on receive. The lowest tone of the JT65 signal is normally 1270Hz.JT65A signal bandwidth extends about 200Hz above 1270.5Hz sync. Sync tone is the reference mouse-click frequency for JT65.Normal operation of JT65A is a sync audio frequency of 1270.5Hz.JT65A may be used in the 500Hz bandwidth segments of bandplans.
JT65A signal is about 1.3+kHz higher than the VFO frequency JT65A operators use USB VFO FREQUENCY for spots. Old JT65A frequency was 24920 kHz (changed to avoid QRM ) The JT65A frequency 12metres is 24917.0 kHz USB VFO. The JT65A alternate frequency 17meters is 18098.0 kHz USB VFO. The JT65A signal frequency is about 18103.3 to 18103.7 kHz. The JT65A frequency 17metres is 18102.0 kHz USB VFO. The JT65A signal frequency is about 7077.3 to 7077.7 kHz. The JT65A sync frequency (USA) is 7077.27 kHz The JT65A frequency 40meters (USA) is 7076.0 kHz USB VFO. The JT65A signal frequency is about 7040.3 to 7040.7 kHz. The International JT65A sync frequency is 7040.27 kHz International JT65A frequency 40metres is 7039.0 kHz USB VFO. *Special Note: Do not transmit within 10139.9-10140.1 kHz QRSS CW weak signal window! This transmit signal is within the 10140-10150kHz automatic digital sub-band. The JT65 signal frequency is about 10140.3 to 10140.7 kHz. *Do not use a sync frequency less than 10140.2 kHz. The JT65a sync frequency is 10140.27 kHz. The JT65A frequency 30metres is 10139.0 kHz USB VFO. The JT65 signal frequency is about 14077.3 to 14077.7 kHz. The JT65a sync frequency is 14077.27 kHz. The JT65 frequency 20metres is 14076.0 kHz USB VFO. The most popular JT65A frequency is in the 20 Meter band: