First Experience with JT65

First off, I want to start this post by thanking Dan, W0JMP for the help last night in using this awesome mode. He was my first JT65 contact and my first 30Meter contact. Awesome stuff indeed.

I finally added my Rigblaster M8 to my Kenwood TS-440S and thought that I would try listening to some data last night. I heard some things about JT65 and JT9 being used for weak signal communications such as moonbounce (EME), and meteor scatter. It appeared from my research that it is use in weak signal HF as well. It is impressive how weak the signal can be in order for the waterfall to see the station and the application to decode the data. The first image shows my first attempt at listening and decoding data coming in. I was using 10.130 as the receive frequency because at night, 20Meter up to 10Meter were dead. The application was decoding some stations which is step one. 🙂 From what I have been reading the lower the wattage out, the better for this mode. It has been said that 25 – 30 Watts may be considered high wattage. The higher the wattage the more QRM that you will cause for other stations. I need to turn mine down then.. 😀



The application which I used is called WSJT-X which has a lot of capability in making this form of communication much better. Dan mentioned that timing is very critical and he recommended that I use dimension4 to help with the timing. He mentioned that my timing was about 0.8 seconds off, which was ok, but not perfect. I now have it installed and ready to rock.

Another application that Dan recommended is called JT-Alert which will alert to what calls are coming in over JT65 and should keep you from duplicating the call on the same band.

This video is not mine, it just shows how to run JT65 with JT-Alert and you can see where Dan is popular. His call shows up in this video as well. This is not mine.


I put a feeler out on the ham radio Facebook page on Feb 11th, about this mode and got some awesome help for my first time attempt on this mode. As you can see, Dan, W0JMP chimed in with some information on how to use the application to establish communications. Here are some items that were mentioned.

– Hit the TX6 button which is the CQ KF4BZT EL09 text. This will be sent over the air

– Once someone established communications, the lines will turn read showing that they are talking to your station

– When a contact is established, start with Tx1 button and work your way down. The other station will respond with the same information






– When you get to the final transmission, you will have the option to log the contact with information in a pop-up window.




First Night Contacts – Feb 12th- I am happy with the results and the states that I am picking up on 30Meter now. 😀



LOTW Entries from the first night. Not too bad at all.



I found that there are different bands to choose from just like most other modes.

10Meter – 28.076.0 USB

12Meter – 24.917.0 USB
alternate 24.920.0 USB

15Meter – 21.076.0 USB

17Meter – 18.102.0 USB
alternate 18.098.0 USB

20Meter – 14.076.0 USB
alternate 14.075.0 USB

30Meter – 10.139.0 USB
alternate 10.138.0 USB
alternate 10.137.0 USB

40Meter – 7.039.0 USB
alternate 7.036.0 USB
(USA) 7.076.0 USB

80Meter – 3.576.0 USB



  • 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.


The following notes are from the URL

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.


Good Information


73 For Now




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