You also have the option to opt-out of these cookies. Essex Ham - Supporting Amateur Radio in Essex It is calculated as the ratio of signal power to the noise power. JS8Call (JS8) is an amateur radio QSO communication mode based on FT8. ), or even compromised antennas. If I ran the preamp on it would make the situation even worse. Be sure your audio chain does not introduce any distortion. Now, with FT8, I have real comparisons and can surely see a 5 - 10 db difference for most contacts. Many Thanks for the link James, explains it well, a useful chart that gives the scale. As others have said, the signal reports are based on the signal-to-noise. Functional cookie placed by CleanTalk Spam Protect to store referring IDs and prevent unauthorized spam from being sent from the website. FT8 and GridTracker - Digital Amateur Radio for digital amateur - VK3FS Please review the new, If you are having a problem, please refer to the. The simple fact is that they probably have a better antenna than you and yes, they may be running more power, but that won't make too much difference. YouTube sets this cookie to store the video preferences of the user using embedded YouTube video. If I tighten the passband in HDSDR down to like 100hz around the signal of interest, there's virtually no other noise in the WSJT-X passband. FT8 is a weak signal - not a low power mode (power works the really weak ones) FT8 lets you work DX on 6m when there would be none FT8 is suddenly dominating VHF/UHF contesting FT8 lets you work weak signal DX without proficient CW skills FT8 is like having constant DX beacons on every band Re: [CQ-Contest] Reciprocity in signal strength Is it because I'm only running around 1/2 power? Donation will show as going to SFBA Tech, this is normal, under the same paypal account. I consistently get low signal reports for FT8 contacts, typically 15db less than what I send as a received signal. Very helpful. Signal reports for FT-8 can vary by 10dB or more between cycles due to fading and changing polarization. reading instead of in a more conventional, though more subjective, rstS reading), (This can also be shortened to "RR73" indicating, "Report Received 73," which would be a completed QSO), (not used if KI7PO's third transmission was "RR73"), Operators will transmit one message within a 15 second time-frame, then wait for another 15 seconds to receive any incoming replies (then transmit again, then wait again, in a cycle that exchanges messages until the conversation is completed). The two options require different actions. Antenna for 70cms is a 7 ele ZLspecial, fixed towards SE up at about 15 feet. The DT in the window of the software shows TIME DIFFERENCE. Personally, I dont really understand the pleasure of almost completely automatic radio communications, but the FT8 is popular, so people use this. then work outwards. ft8 signal reports explained - Queendommedia.com ), yet the signals are very audible. Importance of a Clean Digital Signal - OH8STN Ham Radio The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal. Hello, after years of saying I would never work FT8 I have finally taken the plunge and having a play. Therefore, FT8 is not a "keyboard-to-keyboard" (real-time chat) mode. This signal is transmitted almost "as is" into the air, and the backward process of decoding is activated on the receiver side. On Tue, Jan 4, 2022 at 7:15 AM John wrote: Are you sure you wish to delete this message from the message archives of main@WSJTX.groups.io? This ham radio digital mode appeared in 2017, and since then its popularity has only been growing. Until you're into the -20dBs you're being heard. Ham radio callsigns have a strictly defined format of letters and numbers, which also allows us to record them in a more compact form. This will cause the software to compare the signal to the noise floor of the virtual audio signal which is way lower than my RF noise floor. I am not sure how easy it is to measure the output power at the SteppIR, but I could measure power at the bottom of the antenna. I'm using a TS-590S for FT-8 on a MyAntennas 4010-1k EFHW that's around 35'. It's a shame that most people don't understand that FT8 is designed for weak signal communication. The mode is a modification of the JT9 & JT65 weak-signal modes that have been around for nearly ten years, an eternity in the digital world. Create an account to follow your favorite communities and start taking part in conversations. Your antennas ability to direct that transmit power at the receiving station and. Different colors are different bands and minutes indicate the last time they heard and reported back automatically. Yep I've been lucky enough to get Fiji x2 and Kenya in the past week or 2 so it's definitely working! Heck, I even see a difference in dB when running two slices off the same antenna. Replied by G0CBOon topic FT8 Signal Reports Many Thanks for the link James, explains it well, a useful chart that gives the scale. You are just very strong. This cookie, set by Microsoft, is used by the website to store the user's session ID and is sent with each request to the ASP.NET application. Both are compromises, but my FT8 contacts in Antarctica, Fiji, Australia, NZ, Japan, etc don't know that. Frequencies for JS8Call and FT8 are adjustable by the user. For details of this cookie, go to. FT8 was developed by Joe Taylor (K1JT) and Steve Franke (K9AN). Special message These cookies will be stored in your browser only with your consent. The reason of using this letter as a signal report comes from the early CW times and it's meaning is simply "I . YSC cookie is set by Youtube and is used to track the views of embedded videos on Youtube pages. (Serial number sequencing for DX op's could be a challenge for those op's) The typical JT / FT8 signal report data would interchange nicely instead of RS (T) without any modifications. Necessary cookies are absolutely essential for the website to function properly. FT8 Digital Radio ProtocolHow Does it Work? - Medium Topics from Around the World / FT8 and its Decibels May.2021 - Monthly SNR measurements in this range imply the received signal power level is below the received noise floor. Have you ever wondered why JT65 reports a Signal-to-Noise Ratio (SNR) typically in the range -30 dB to -1 dB? For FT8 and many other digital modes (But not RTTY), the values are measured by the software and are expressed in dB such as -10 or +02 for example. FT8 - Wikipedia JTDX - Feature Rich Software for FT8 and Other JT Modes From my playing I think this one is alc related. There are 4 slots per minute, and you transmit for one 15 second block, then listen for replies for 15 seconds, and transmit again for 15 seconds. The test_cookie is set by doubleclick.net and is used to determine if the user's browser supports cookies. The radio also needs to be in DATA mode. It's not a measure of your output. SNR(dB) = 10*LOG[ Signal Power in watts / Noise Power in Watts] - KF6HI This is measurable to some extent by the signal reports on FT8. FT8 handles very weak signals very well, meaning that a Foundation licence holder with just 10 watts should be able to make some impressive contacts with a modest antenna - something not possible with voice or some other data modes. What sort of AGC are you using? The cookie is used to store the user consent for the cookies in the category "Other. It includes integration with PSK reporter. Lets try to figure it out. Forum Digital modes and operation JT65, JT9, FT8 SNR Explained Now, with FT8, I have real comparisons and can surely see a 5 - 10 db difference for most contacts. JTDX adds a number of FT8 decoding options that are useful on crowded bands and in situations when signals are very weak. how to simplify expressions with exponents fractions. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. Some of the data that are collected include the number of visitors, their source, and the pages they visit anonymously. If band is open pulls in FT8 quite well The following user(s) said Thank You: M0ZAH This mode allows communicating with a lower s/n ratio compared to PSK31 or RTTY. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Hit tab to get into that menu. This cookie is set by GDPR Cookie Consent plugin. transmitters. YouTube sets this cookie via embedded youtube-videos and registers anonymous statistical data. signal reports when using FT8 and JT65. In this case, the PC is generating a signal (usually RTTY or PSK), and the operator communicates with the correspondent using a kind of text chat. FT8 signal reports : r/amateurradio - Reddit UTC: When the signal was received, dB: Signal strength of the received signal in dB. To enable reporting, you need to enter the following information into the settings or preferences . Questions? That lets a massive amount of signal into the mixer. The idea of replacing characters with indexes is important here, which is effective when using a small dictionary size. ft8 signal reports explained. A +12 signal does not say how much power a person is using. The above is an example of what you will find at the PSKreporter.info website where you can monitor your own transmissions and see where you are heard. According to Taylor, the important characteristics of FT8 are T/R sequence length: 15 s Message length: 75 bits + 12-bit CRC FEC code: (174,87) LDPC Modulation: 8-FSK, keying rate = 6.25 baud; tone spacing = 6.25 Hz Waveform: Continuous phase, constant envelope Occupied bandwidth: 50 Hz I got a + signal report back from one and a -18 or so back from the other. But this is my personal opinion. JS8 was created to allow the basic principles of FT8 to be applied to sending actual messages (instead of just the bare minimum QSO information that FT8 limits operators with). FT8 Signal Reports - NARC Forum Here is what FT8 signals looks like, displayed in the WSJT-X waterfall view: Youll see from the above waterfall screenshot that there are over a dozen QSOs visible these are all taking place on a single frequency of 14.074MHz. The application WSTJT-X is one of themost common used for FT8 (As well as JT65), and was written by the inventor of the mode, Joe Taylor K1JT. FT8/FT4 Signal Reports in upload to eQSL.cc - wsjtx.groups.io Lets see in more detail how this works. The indicated FT8 signal to noise ratio is very misleading. The Examples: Does anyone else have this trend as well? FT8 and Ghost Decodes. As you can see here, I decoded everything from -21 to +05 range on 80m using the WSJT-X Software. Conclusion. Conventions may change with time or by user preference; you can modify the frequency table as desired." With a SignaLink, it is always best to go back and follow the setup instructions EXACTLY. In the first step, common abbreviations are replaced by shorter codes, for example, CQ gets a 02h code. I don't run any preamp for FT8. Its a really smart combination of bit optimization, mathematics and usability. the QSO record in ACL log does contain the signal report . This cookie is set by GDPR Cookie Consent plugin. Pending some tweaking and other optimizations I've a version running using the library right out of the air, receiver SDR is a rtl-sdr dongle. CleanTalkUsed to prevent spam on our comments and forms and acts as a complete anti-spam solution and firewall for this site. I like to keep things as up-to-date and as accurate as possible. Probably everyone who is at least a bit interested in amateur radio and telecommunications heard about the FT8 digital communication protocol. So, the signal reports dont make any sense. CleanTalk sets this cookie to store dynamic variables from the browser. 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