Shorthand messages for ro, rrr, and 73 dispense with the sync vector entirely and use time intervals of 1638411025 1. W7gjs checklist and tips for using jt65 mode on 6m eme. We use a single sma relay to switch the lna from the rx probe to a 50 ohm termination. Trak sm this program locates the sun and moon in real time using a full set of ephemeris factors. The rx probe uses male sma, the relay is all female sma and the lna and termination are male sma.
First release of jt65 software designed specifically for eme. Both jt65 hf and wsjt support the use of eme shorthand sequences for ooo, rrr, and 73. The beginners guide to software defined radio rtlsdr. Amateur eme, 2003 the miracle first release of jt65 software designed specifically for eme decodable to odd but fun digital mode ok i know this mode is not for everyone but really what other mode has the capabilities to work the eu, south africa, south america, japan, new zealand and australia all on 40 meters, low power about 20 watts with a dipole up 25 feet on a saturday morning between 7 am and 8. Eme fun software michael margaras sv1cal amateur radio. Jt65hf any versionmode of jt65a is a time kller to say the least. To maintain consistency with other eme practice, these hardy souls use exactly the same longestablished criteria for what constitutes a valid qso. Jt65a and jt65hf software weak signal digital mode on hf. Software for amateur radio weaksignal communication. I initially spent quite some time dealing with issues around the possibility of false qsos indeed the possibility of jt65 qsos carried out using jt65 not being qsos at all. Jt65hf is the tale of two hams named joe joe taylor k1jt and.
I am not sure why anyone is discussing a pair of isolation relays for 23cm eme. Only stations with large arrays can detect the weak eme signals by ear. Hflink is the international resource for high frequency communications, hf digital messaging, emergency disaster relief, interoperative hf communications, hf networking, ham radio. The advantage of 23cm band is also less array size and in most cases the use of dishes which unlike to yagi antennas allow easy solve the problem with polarizations changes. Ive got my 2nd radio set up to do jt65 and jt9 on 6 and 2 metersf, but so far ive not heard anyone or been answered. Jt65 digital mode software category is a curation of 9 web resources on, wsjtx, jt65hfcomfort, jt65hf by w6cqz. Jt65a mode is now the standard for 6m eme, since it is the most sensitive of the jt65 modes. Wsjtx and the jt65 digital protocol in the early days of eme communications, one had to rely on cw mode to make contacts. The program was initially written by joe taylor, k1jt, but is now open source and is developed by a small team. We recommend the free dimension 4 program to keep your clock in sync with an accurate internet time service.
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. The feeds have a tx and rx port with at least 24db of isolation. The lowest tone of the jt65 signal is normally 1270hz. Its used to work with right hand polarization for tx and left hand polarization for reception its because of reflected signal from the moon surface has opposite sense.
You had better look for the frequency of the stations calling cq, in the dxcluster or in the jt65 eme chat or in the on4kst eme chat or in livecq on 144 mhz. Diese betriebsart wurde ursprunglich entwickelt fur erdemonderde eme. Jt65hf an odd but fun digital mode ok i know this mode is not for everyone but really what other mode has the capabilities to work the eu, south africa, south america, japan, new zealand and australia all on 40 meters, low power about 20 watts with a dipole up 25 feet on a saturday morning between 7 am and 8. My favorite digital mode has to be the jts otherwise known as jt65 and jt9. Jul 28, 2016 read the rest of the series in the digital communications in amateur radio articles category. Aug 20, 2019 download jt65 hfhb9hqxedition for free. The digital signal processing techniques in wsjt make it substantially easier for amateur radio operators to employ esoteric propagation modes, such. Eme fun software is basically a eme station manager which sets up the radios on my eme shack,tracks satellitesmoonsun, communicates with spid controller or my eme fun antenna controller board click for details, compensates doppler shift home,dx, reads map65wsjt files, monitors gpsdo 10 mhz status etc.
Yagi 6m ve2zaz january 2012 how small can an eme station be. These were created for use in extreme cases such as the 250 db path loss during a signals round trip to the moon and back and are strongly discouraged on hf. On users computer displays, the exchanges in a jt65 eme qso typically look something like this. Jt65 digital mode software category is a curation of 9 web resources on, wsjtx, jt65 hfcomfort, jt65 hf by w6cqz.
Entered his callsign and grid in the corresponding input boxes. In the february 2005 edition of the 432 and above eme newsletter from k2uyh k1jt states the following regarding jt65 and its users. Youll see from the above screenshot that there is a waterfall as with psk31 that shows multiple qsos. For eme qsos the signal report ooo is sometimes used instead of numerical signal reports. Parabolic reflector for hrpt weather satellite reception and moonbounce eme communication the setup consists of the following. The jt65 hf hb9hqx edition software, along with the source code, may be obtained from sourceforge. Jt65a signal bandwidth extends about 200hz above 1270. Jt9 is very narrow band, one tenth the bandwidth of jt65. And mshv from lz2hv recompiled from source code of wsjtx with different gui implementation both for linux and windows os. Useful eme software category is a curation of 11 web resources on, moonsked, eme system, linrad. Nova for windows tracking software n0uk jt65 eme logger website. I am using separate amplifiers for tube testing and eme operating. On the other hand, jt65 probably achieves a higher data transmission rate but would seem to put higher requirements on the stability of the received signal strength, as one would see on vhf and up where the major propagation mode is line of sight with a reflector thrown in for good measure in e. After playing around i found a way using the ic9700 with wsjtx by emulating an ic7300 wich has about the same architecture.
Jt65 can process signals 8 to 10 db weaker than that level. Wsjt software from k1jt and time sync software for pc. Jt65 was designed to work efficiently with the existing standards and conventions for eme contacts. Jt65 was originally designed for eme work but, along with jt9, is also very popular for weak signal andor low power work on hf. A singlechannel system works extremely well for 23 cm eme, displaying all signals both. Jt65jt44 in eme, a presentation by k2uyh from csvhf and other vhfuhfshf meetings. Sync tone is the reference mouseclick frequency for jt65. Within each interval, the waveform is a constantamplitude sinusoid at one of 65 predefined frequencies, and frequency changes between intervals are accomplished in a phasecontinuous manner. Fortunately, there are some goodguy effects that help to put eme communications within reach of most amateur radio stations. Then you can try to detect their signal and answer. Both these modes however are also used on 6m for weak sporadic e, particularly transatlantic. Spid or homemade eme fun antenna controller see related article 3 the eme fun software is used to track satellitesmoonsun and controls the radio in the shack see related article 4 for moonbounce a homemade septum feed is used for 23cm based on the w2imu n2uo design. Jt65 relies on the computers clock being very accurate. Usually, jt65 signals weaker than 22 db are not heard in the speaker at all.
The jt65 encoding and decoding routines, also used in wsjt, are developed by k1jt, joe taylor. Amateur radio software for transmissionreception of jt65 protocol on hf bands 2m 160m important. Noise meter noise meter software for the noise meter tool by g8kbb that measure noise using a pc sound card and calculate noise figures by means of a calibrated noise source. New improved jt65 mode offers several additional db advantage, and is even easier to use. Parabolic reflector for hrpt weather satellite reception and moonbounce eme communication. In this case i knew in advance from the dxnews page that s79hp eme expedition was going to operate on 144. Wsjt hsms and jt65eme mode by k1jt, recent full version. Unchecked the tx first box as i had to tx second this time. It is conveyed by reversing sync and data positions in the transmitted sequence. Jt65 hf jt65a hf frequencies frequency information. All of the impairments outlined above made these contacts very challenging and the antennas and power levels required put eme communications out of the reach of most amateurs. Jt65a is a weak signal digital mode for ham radio qso. At that time i wrote that i have no experiences with such a high band so i wrote a brief facts about 23cm only. Wsjt hsms and jt65 eme mode by k1jt, recent full version.
Make sure that the audio level into the software is set correctly. I was qrv from palestine as e44qx on 23cm band with 1. This site describes the use of hf frequencies for jt65a. Wsjt is a computer program used for weaksignal radio communication between amateur radio operators. Getting started with psk31 and jt65 free psk31 software windows. Herman e44hp then used the dish for 9cm and cm band operation. It starts by ensuring that its transmitted messages are compact and efficient. Amateur radio software for transmissionreception of jt65 protocol.
The jt65 encoding and decoding routines, also used in wsjt, are developed by k1jt. If its off by a second or more, it wont decode the messages. Amateur eme, 2003 the miracle first release of jt65 software designed specifically for eme decodable to jt65 uses 126 contiguous time intervals, each of length 0. Scanning the band looking for signals is not a very good idea. It is this challenge the fascinates most emeers including this one. Da oftmals behauptet wird, bei jt65 werden gar keine richtigen qsos. Jt65 hf any versionmode of jt65a is a time kller to say the least. Since i started using jt65hf software, i have had the volume set to zero on my radio.
However since then i made several successful tests so almost one year later. Avoid hotswitching coaxial relays wears out contacts at much accelerated rate. Its used to work with right hand polarization for tx and left hand. Since i started using jt65 hf software, i have had the volume set to zero on my radio. This way, i can run the software around the clock without disturbing the xyl. The signal is reflected off the moon and received by an equally powerful station with large arrays. In past i wrote in radiojournal magazine serial story about first qrp eme qso, where i mentioned also 23cm band. An example that another way could be usage of horn antenna made of mesh wire.
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