Capture of the HFLINK website or any part of it Any external hyperlinks must only be to the main page of the HFLINK.COM HFLINK, HF-LINK, HF LINK, and the HFLINK LogoДЄre trademarks of HFpack Inc. Need for alternate frequencies if QRM is experienced.Д) Coordination with the changing spectrum utilization of the amateur community.Д®) The high popularity of a new mode-du-jour may create a temporary need to find a new or alternate calling frequency.ДЇ) There are many competing modes in the weak signal part of the digital bands.Дў004, 2005, 2006, 2007, 2008 ,2009, 2010, 2011 HFpack Inc. Time-sharing modes such as PACKET, PACTOR, ALE, PSKmail, and APRS.ДЄ) Amateur radio band rules are different in some countries. The long tone carrier duration of JT65 transmissions has potential to cause severe interference to otherД«ecause JT65A is NOT COMPATIBLE with MFSK, FSK, HELL, OLIVIA,Д¬ONTESTIA, ALE400, or RTTY and can cause severe interference to fast JT65A should notД«e used in parts of the ham bands where faster digital modes are in use.Д¤. Normal activity of JT65A is in the 'weak signal' part of the hamД«ands, near the PSK, MFSK, and Olivia 500 frequencies. Maximum for normal activity and DXing in the 40metre to 10metre bands.ДЈ. To avoid QRM to other JT65 signals and other modes. Operators should be careful of frequency selection, accurate clock, and calibration.ДЄlways listen and observe the waterfall spectrum of signals on theДЇrequency before transmitting, and during activity.Дў. Special Notes on Good Operating Procedure:ДЎ.

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:

Jt65 time sync