JT65A/JT65/JT65-HF mode is normally used on HF, MF, LF and 6 meter bands.
- The most popular JT65A frequency is in the 20 Meter band.
- The JT65 frequency for 20 meters is 14076.0 kHz USB VFO.
- The JT65a sync frequency is 14077.27 kHz.
- The JT65 signal frequency is about 14077.3 to 14077.7 kHz.
- The JT65A frequency for 30 meters is 10139.0 kHz USB VFO.
- The JT65a sync frequency is 10140.27 kHz
- The JT65 signal frequency is about 10140.3 to 10140.7 kHz*.
Note: This transmit signal is within the 10140-10150kHz automatic digital sub-band.
- International JT65A frequency for 40 meters is 7039.0 kHz USB VFO.
- The International JT65A sync frequency is 7040.27 kHz
- The JT65A signal frequency is about 7040.3 to 7040.7 kHz.
- The JT65A frequency 40meters (USA) is 7076.0 kHz USB VFO.
- The JT65A sync frequency (USA) is 7077.27 kHz
- The JT65A signal frequency is about 7077.3 to 7077.7 kHz.
- The JT65A frequency for 17 meters is 18102.0 kHz USB VFO.
- The JT65A sync frequency is 18103.27 kHz
- The JT65A signal frequency is about 18103.3 to 18103.7 kHz.
- The JT65A alternate frequency 17meters is 18098.0 kHz USB VFO.
- The JT65A frequency for 12 meters is 24917.0 kHz USB VFO.
- The JT65A sync frequency is 24918.27 kHz
Note: before date 9/2011, the old JT65A frequency was 24920 kHz (changed to avoid QRM)
- The JT65A frequency for 10 meters is 28076.0 kHz USB
Important Information About All JT65 Frequencies:
- JT65A operators use USB VFO FREQUENCY for spots.
- JT65A signal is about 1.3+kHz higher than the VFO frequency
- The JT65A Passband is about 355Hz. Bandwidth is about 200Hz.
- JT65A may be used in the 500Hz bandwidth segments of bandplans.
- Normal operation of JT65A is a sync audio frequency of 1270.5Hz.
- Sync tone is the reference mouse-click frequency for JT65.
- JT65A signal bandwidth extends about 200Hz above 1270.5Hz sync.
- The lowest tone of the JT65 signal is normally 1270Hz.
- The system allows approximately +/-600Hz auto-tuning on receive.
Special Notes on Good Operating Procedure:
1. Operators should be careful of frequency selection, accurate clock, and calibration. Always listen and observe the waterfall spectrum of signals on the frequency before transmitting, and during activity.
2. JT65A is a weak signal digital QSO mode. Always use very low power on HF to avoid QRM to other JT65 signals and other modes. 20Watts ERP is maximum for normal activity and DXing in the 40metre to 10metre bands.
3. Normal activity of JT65A is in the “weak signal” part of the ham bands, near the PSK, MFSK, and Olivia 500 frequencies. JT65A should not be used in parts of the ham bands where faster digital modes are in use.
4. The long tone carrier duration of JT65 transmissions has potential to cause severe interference to other modes.
5. Do not use JT65 in 10144kHz-10150kHz because JT65A is NOT COMPATIBLE with MFSK, FSK, HELL, OLIVIA, CONTESTIA, ALE400, or RTTY and can cause severe interference to fast time-sharing modes such as PACKET, PACTOR, ALE, PSKmail, and APRS.
Multiple JT65 frequencies are listed on some bands, due to:
A) Amateur radio band rules are different in some countries.
B) The need for alternate frequencies if QRM is experienced.
C) Local or regional interference on a main frequency.
D) Coordination with the changing spectrum utilization of the amateur community.
E) The high popularity of a new mode-du-jour may create a temporary need to find a new or alternate calling frequency.
F) There are many competing modes in the weak signal part of the digital bands.