Jt65 decoding software for mp4

This link is listed in our web site directory since saturday mar 28 2015, and till today jt65hfcomfort has been followed for a total of 41 times. Jtdx jt9 and jt65 modes for lf mf and hf amateur radio. If its off by a second or more, it wont decode the messages. Communicating under the noise jt65a on hf part ii by david t. Its a case of tuning in to a jt65 frequency, waiting for oneminute transmit cycle to complete, and looking for a cq message to reply to. Jt65 hf jt65a hf frequencies frequency information. A reed solomon 63,12 errorcontrol code converts 72bit user messages into sequences of 63 sixbit informationcarrying symbols. Using wsjtx software to operate jt65 and jt9 modes. A few days ago i saw a stonkingly strong to use an english colloquialism jt9 signal and still did not decode it.

Read the rest of the series in the digital communications in amateur radio articles category. If i set my k3 in data mode a, no decoding of jt65 signals occurs during the 12 second decoding period, but 2 if i set my k3 in the usb mode, decoding of the jt65 signals does occur. Because of this fec process, messages are either decoded correctly or not decoded. Jt65 can also be decoded by other packages, such as multipsk. Please correct me if im wrong with order of doing things, because im not 100% sure how this particular thing should be done. Signal reports range from 1 to 30 db signaltonoise in jt65. Telescopeman discusses 4 free software programs that decode jt65 digital signals. When using the jt65 hf software, youll need to adjust your thinking about the waterfall display. Jt65 and jt9 signals so strong they wont decode qrz forums. Jtdx is an open source ham radio program for hf jt65 and jt9 modes. Sync tone is the reference mouseclick frequency for jt65. Unlike wsjt which if set to wide decode only decodes the strongest message, w4cqzs jt65 hf software will decode all messages in the 2000 hz receive bandwidth window which is shown on the waterfall. We recommend the free dimension 4 program to keep your clock in sync with an accurate internet time service.

The jt65 encoding and decoding routines, also used in wsjt, are developed by k1jt, joe taylor. Make sure that the audio level into the software is set correctly. Wlo transmits weather information via sitor b immediately after rtty transmissions, switching back and forth, which makes for even more fun. Jt65hf lies within system utilities, more precisely device assistants. This way, i can run the software around the clock without disturbing the xyl. Jt65hf any versionmode of jt65a is a time kller to say the least. Amateur radio software for transmissionreception of jt65 protocol. Maybe multipsk can do it too, but i havent spent enough time with it to know. Every time a new version comes out i set up the old and new version to see if the new is an improvement in decoding. Wsjtx will do both jt65 and jt9 but jt65hf will only do jt65. Wsjt is a computer program used for weaksignal radio communication between amateur radio operators. The jt65hf software may be obtained from sourceforge.

Over on the sdrplay blog and forums oh2bua has been sharing how he has set up propagation triggered recording by continuously monitoring jt65jt9 signals with his sdrplay. The jt65 spec says, a transmission nominally begins at t1s after the start of a utc minute and finishes at t47. Sitor b sounds a lot like rtty to the human ear, but requires different decoding software. Wsjt x software to decode ft8 jt65 wspr and more digital modes. Was using jt65hf and decoding was going great, then no decodes. As with jt65, it was created by k1jt as development of jt65 for use on the lfmf and hf bands. The jt65 encoding and decoding routines, also used in wsjt, are developed by k1jt, joe. Latest tests demonstrating high efficiency of the threepass decoding on the overcrowded hf bands. Having said that, im prepared to eat my words in regard to the jt65hf software published by joe w6cqz. Wsjt amateur radio software alternative software for jt65. I previously commented that my tablet clock wouldnt sync, making it useless for synced digital modes. Jt65 relies on the computers clock being very accurate.

I have operated this software and hardware for the past 4months in this configuration without a problem until now. There are alternative software packages available for jt65 including multipsk a commercial package developed by f6cte, and jt65hf a freeware package developed by w6cqz. The idea is that you leave the radio on receiving all night, and set it to automatically start recording iq files if good propagation conditions occur as determined by the locations received from the jt65jt9 signal. Discussion in working different modes started by k0han, nov. Did i forget a program or the software data is not up to date, please write to me via the contact form. Version 10 implements modes jtms, fsk441, fsk315, iscat, jt6m, jt65, and jt4. Since i have the 6500, four sessions are possible running on separate slices.

Jt65hfcomfort an extension of the excellent decoding software jt65 hf by joe w6cqz for amateur radio digital mode jt65. It can be used together with linrad by sm5bsz or with direct input from a soundcard or. Jt65a signal bandwidth extends about 200hz above 1270. All users of jt65 whether with wsjt, multipsk or jt65hf owe a debt of gratitude to k1jt and the wsjt development group for their efforts and generosity in having made the wsjt source code available and open. These are interleaved with another 63 symbols of synchronizing information according to the following pseudorandom sequence. Usb audio interfaces for digital modes jim brown k9yc k9yc. Jt65 has found a use on hf and can be found around 14. Jt9 can have tentimes the signals but decoding of overlapping signals is much less likely to happen. Since i started using jt65hf software, i have had the volume set to zero on my radio. Now to sitor b simplex teletype over radio mode b, another nonvoice mode we can use to decode wlo transmissions. Hi doug, for jt65jt9 i use wsjtx from k1jt togehther with jtalertx. If you want a full packaged video decoding program coming with efficient mp4 video decoding and low cpu usage, macx video converter pro would be your thing, which offers a complete solution for mp4 file decoding. Problem decoding jt65 messages in jt65hf software this morning i ran across a weird issue with the jt65hf software not decoding jt65 digital messages.

As another poster stated, the deep search feature of wsjt doesnt play a role in this softwares signal decoding or reception process im not a programmer and the software appears to receive. Amateur radio software for transmissionreception of jt65 protocol on hf bands 2m 160m important. Not sure if it was my radio 857d or not, but i noticed what appeared to be some frequency drift up to 50 hz at different times on the waterfall, and i suspected this might have been part of the problem. Other unofficial or limited pskreporter client software.

Hi,i have been mostly working jt modes since getting my flex a couple of months ago. Wsjt x software to decode ft8 jt65 wspr and more digital. This free program was originally developed by joe large w6cqz. Decode signals many decibels below the noise floor about 24 db without.

Was using jt65 hf and decoding was going great, then no decodes. Jt65 eme logger is to be used only for the purpose of discussing matters related to amateur radio communications. Its entirely possible that my results were affected by an improper setting for the software. The main category is jt65 software that is about jt65 digital mode software. While there are a few software packages available for jt65, i chose to use wsjtx. The jt9 mode are in many ways similar to jt65 as the share the same basic concept.

The program was initially written by joe taylor, k1jt, but is now open source and is developed by a small team. During the 6 meter openings over the last week i had some trouble decoding even very strong signals on jt65 using jt65hb9hqx as well. It is useful for testing the jt65 decoder and the relative capabilities of these two modes. A detailed description of the jt65 protocol was published in qex for septemberoctober, 2005. Jt65 digital mode software category is a curation of 9 web resources on, wsjtx, jt65hfcomfort, jt65hf by w6cqz. Jt65a and jt65hf software weak signal digital mode on hf. I have determined that if i setup four slices on the same frequency and four jt65 sessions same version there are differences in the decoded calls about 25% of the time. Software for amateur radio weaksignal communication. Jt65hf is based on code from the wsjt project and would not be possible without the efforts of k1jt and others within the wsjt development group. Jt65 is a popular amateur radio mode suitable for long. New software for vhf meteorscatter communication, qst. Mainconcept is a worldwide leading provider of highquality codec technology supporting industry standards such as h. The digital signal processing techniques in wsjt make it substantially easier for amateur radio operators to employ esoteric propagation modes, such as high speed meteor scatter. Ive been doing more hf listening with my sdr but i am having problems decoding jt9jt65.

Ft8 amateurham radio mode software support icq amateur. That problem seems to have mysteriously fixed itself, and now my ntp service shows that my clock is rarely off by more than 15ms every 15 minutes. The fastest mp4 decoder to decode mp4 video in seconds with minimum cpu usage. They are both using the 48 second transmission period, decoder. Best mp4 decoder software to easily decode mp4 video. Map65 implements a wideband receiver for jt65 signals, optimized for eme on the vhfuhf bands. Wsjt is the original program, first released in 2001. The lowest tone of the jt65 signal is normally 1270hz. Rt systems releases macos programming software for baofeng, uv5r, yaesu ft60 icom id51, id51a, id51ae, id51plus, id51plus2 rumlogng version 4.

I recently downloaded jt656hf by w6cqz and have on several occasions monitored 14. Jt65hf would not be possible without the efforts of joe taylor k1jt and his wsjt software upon which jt65hf is, in part, based. Jt65hf setup and use guide jt65hf is 2008,2009,2010 j. The latest wsjtx release was modified for tests with user choice between two and threepass decoding. That software logs correctly jt65 and jt9 without extensions. Each transmission must begin within the first 4 seconds of the minute to be decoded. Interestingly, it seems to decode only one jt65 transmission per minute, while the wsjt software decodes all jt65 signals in parallel. Youll see from the above screenshot that there is a waterfall as with psk31 that shows multiple qsos. Jt65 was developed originally as part of the wsjt weak signal modes software package by joe k1jt.