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Text of the page (random words):
olivia digital mode on hf olivia digital mode on hf the olivia digital dxers club and the olivia digital mode community welcome you live station spotting board view live on air station spots filter by mode band and spot station activity in real time olivia on groups io click to learn more about olivia join our active community read posts and files collection olivia on facebook click to join our active facebook community if you are a facebook user olivia on discord click for live olivia spotting announcements and more olivia dx club clublog click to compare your dxcc status with other oddc members new 2026 olivia qso parties click to learn more about the 2024 olivia digital mode qso parties support the olivia dx club click to help support our website and email server etc live station spots live 15 s refresh loading live radio spots view full live spotting board post spots upcoming olivia events sprints view full event calendar loading upcoming events send direct web feedback feedback guide have suggestions a website issue report or an olivia mode question fill out the form below your message is saved directly in our secure database for the webmaster do not fill this out if human your name optional callsign optional feedback category general comment website bug issue feature suggestion radio spot propagation note other email address optional if reply is requested your message attach screenshots images optional up to 5 images 0 5 have a screenshot demonstrating a bug website issue or visual suggestion you can attach up to 5 image files png jpg webp or gif up to 5mb each you can preview and edit or remove attached screenshots before submitting choose attach screenshot submit feedback introduction video presented to raleigh amateur radio society please view our introduction to the olivia digital mode for amateur radio hf usage for chat and emcomm about olivia mfsk digital mode olivia a multi frequency shift keying mfsk radioteletype digital mode is an amateur radioteletype protocol designed to work in difficult low signal to noise ratio plus multipath propagation conditions on shortwave radio i e high frequency or hf bands the typical olivia signal is decoded when the amplitude of the noise is over ten times that of the digital signal it is commonly used by amateur radio operators to reliably transmit ascii characters over noisy channels slices of high frequency spectrum i e frequencies from 3 mhz to 30 mhz hf exhibiting significant fading and propagation phasing the olivia digital modes are commonly referred to by the number of tones and the bandwidth used in hz therefore it is common to express the olivia digital mode as olivia x y or alternatively olivia y x where x refers to the number of different audio tones transmitted and y refers to the bandwidth in hertz over which these signals are spread examples of common olivia modes are 8 250 meaning 8 tones 250 hertz bandwidth 16 500 and 32 1000 here is a quick table of suggested calling frequencies history the protocol was developed at the end of 2003 by pawel jalocha the first on the air tests were performed by two radio amateurs fred oh dk4zc and les vk2dsg on the europe australia propagation path in the 20 meter shortwave radio amateur band the tests proved that the olivia protocol or digital mode works well and can allow regular intercontinental radio contacts with as little as one watt rf power when propagation is highly favorable since 2005 olivia has become a standard for digital data transfer under white noise fading and multipath flutter polar path and auroral conditions some technical notes olivia and the misunderstood alc we get this question often what should i set my alc to when sending olivia does it work like ft8 with regards to splattering the band if there is too much alc meter movement automatic level control alc is a control circuit that governs the input signal to an amplifier there are different amplifier circuits some linear some not certain types of modulation have non linear characteristics while some have highly linear characteristics olivia is in the family of mfsk modulation schemes like any other form of angle modulation that transmits a single rf tone that varies only in phase or frequency mfsk produces a constant envelope this significantly relaxes the design of the rf power amplifier allowing it to achieve greater conversion efficiencies than linear amplifiers of course that means that olivia is less prone to making an amplifier go out of linearity linear amplifiers need to operate with class a or class ab biasing which makes them relatively inefficient while class c biasing has far higher efficiency a class c amplifier is not linear and is only suitable for the amplification of constant envelope signals such signals include fm fsk mfsk olivia and cw morse code thus as long as the alc is not driven past its high limit adjusting the sound input to the transceiver can be set higher than no alc movement on the typical hf transceiver most operators that understand this will set the audio input to the transceiver up to the alc level where adding any more volume no longer changes the alc peak then they back off a very tiny amount yes setting the sound too high can still cause distortion but if the alc indicates that the input sound signal of the mfsk modulation is within its scale then the signal should result in a clean amplification don t spread misinformation just because you heard or read that all digital signals should have no alc meter movement or you are splattering that s just untrue especially with mfsk modulation such as with olivia references supporting this alc information wiki on mfsk wiki on linear amplifiers ability to handle qrm it is well known that certain configurations of tones and bandwidth gives olivia an edge when dealing with phase noise and other artifacts intrinsic to ionospheric propagation especially over the polar regions but did you know that olivia can handle a significant amount of qrm and still have an effective communication decode of the sent data current community feedback our community is strong and growing in number to foster the community s growth share ideas or leave feedback please connect with us through our online presences groups io post feedback questions and files in our olivia groups io group facebook share thoughts spots and photos in our facebook olivia group discord connect for live spotting and real time chat on our discord server you can also submit feedback directly through our web feedback form above we welcome your input to help improve the site and support the olivia digital mode community voluntary channelization since olivia signals can be decoded even when received signals are extremely weak i e signal to noise ratio of 14db signals that are strong enough to be decoded are sometimes below the noise floor below our ability to hear them and not visible on the waterfall display and therefore impossible to search for manually by listening for the tones or looking on the waterfall therefore in order to find other olivia digital mode signals amateur radio operators have voluntarily decided to use channelization for this mode at least for initial contact this channelization allows even imperceptibly weak signals to be tuned properly for successful reception and decoding once contact is made the operators are encouraged to move off of the calling frequency so that the channel may be used for other amateurs also trying to make that initial connection with other weak signal stations by common convention amateur stations initiate contacts on olivia by utilizing the 8 tone 250 hz bandwidth configuration and then switch to other configurations often 8 500 when conditions are favorable to continue the conversation below you will find the lists of the common center frequencies of the weak signal calling frequencies used in the amateur hf radio bands current olivia calling frequencies on hf as stated above it is often best to get on standard calling frequencies with this mode because you can miss a lot of weak signals if you don t note some websites publish frequencies that are right on top of weak signal jt65 and jt9 segments and now ft8 ft4 signals do not qrm interfere with weak signal qsos you might not see or hear them but those modes are often if not always occupying the neighboring frequencies right above our calling frequencies we the active olivia community members suggest using olivia 8 250 as the starting configuration when calling cq on the usb frequencies that we ve designated as our calling frequencies as you ve deduced by now a calling frequency is a center frequency on which you initially call cq cq cq and then once communications are established with an answering station and with the agreement with the answering operator you both move your operation to a new nearby clear frequency perhaps changing the number of tones and changing the bandwidth at your mutual agreement and discretion even though 8 250 is slow the cq call is short but it is narrow to allow room for other qsos nearby current 2023 suggested starting calling and listening frequencies the frequencies listed below are suggested frequencies on which can be found weak i e a signal that you cannot hear a signal not seen on the waterfall olivia signals while it is easy to spot a strong olivia signal anywhere on the waterfall by using these suggested calling frequencies at least once and a while you will enable us to find your signal when the signal is too weak to hear and too faint to see on the waterfall olivia can do well with weak signals yes our suggested 8 tone with 250 hz bandwidth results in slow transmissions but it is one of the better settings when attempting to decode very weak signals once you make contact you can move up or down a bit away from the calling frequency and then change to 16 500 or 8 500 to make the conversation go faster but on a calling frequency it is advisable to configure operations in such a way as to increase the likelihood that you will find and decode that weak signal in the following list center is where you place the center of the software s cursor and click to select that center frequency on the waterfall if you use the dial frequency from this list then click 1500 hz offset up the waterfall 1500 hz to the right of the left side of the waterfall if your waterfall is oriented horizontally with the lowest frequency on the left this results in the software and transceiver being correctly tuned for the center frequency the listing shows center then dial then the number of tones and the bandwidth center dial tones bandwidth center dial tones bandwidth 1 8390 1 8375 8 250 itu region 1 1 8270 1 8255 8 250 itu region 2 3 5830 3 5815 8 250 7 0400 7 0385 8 250 itu region 2 7 0725 7 0710 8 250 secondary 10 1430 10 1415 8 250 10 1440 10 1425 32 1000 potential 14 0725 14 0710 8 250 14 1085 14 1070 32 1000 18 0990 18 0975 8 250 21 0725 21 0710 8 250 24 9225 24 9210 8 250 28 1225 28 1210 8 250 and so on remember that if you use the dial frequency the second frequency per row set your waterfall center at 1500 hz reference listing olivia digital mode suggested calling hf frequencies example screen grab showing an example also if your software is able to decode encode the reed solomon identification signals rsid please turn on both received and transmit rsid an example is shown in the following video which demonstrates enabling rsid in a popular software suite https www youtube com watch v lbiacwd9nnm tips do not switch to other modes without calling cq for at least a five minute window it is horrid when people call cq and change settings modes bandwidths tones every time they call cq allow people time to get their software set to the right configuration and ready to answer your cq call please turn on rsid txid and rxid in fldigi make sure that your signal does not cross into other sub bands where weak signal modes are active for instance do not have any part of your signal at 14073 5 khz or higher as this is the sub band for ft8 jt65a jt9 do not qrm interfere with weak signal modes such as wspr jt65a and jt9 be aware of the band plans of those modes operating olivia 1 please make sure you are using the rsid reed solomon identification rsid or txid rxid option in your software rsid transmits a short burst at the start of your transmission which identifies the mode you are using when rsid does that those amateur radio operators also using rsid while listening will be alerted by their software that you are transmitting in the specific mode olivia hopefully the settings like 8 250 and where on the waterfall your transmission is located this might be a popup window and or text on the receive text panel when the receiving operator clicks on that link or popup button the software moves the waterfall cursor right on top of the signal identified by the rsid and changes the mode in the software this will help you make more contacts note mixw doesn t have rsid features request it 2 olivia is not a weak signal mode while it is a mode that can decode weak signals it is not a weak signal mode like jt65 or ft8 the olivia mode was designed not for weak signal decoding as the primary design objective but to overcome propagation path phase issues and transpolar region propagation challenges on hf there are no points won by barely making a contact in usa fcc regulations you use the power necessary to make the qso typically with poor propagation 100w or more is the minimum to establish a reliable circuit however beware you cannot set your radio s output power above that which your radio s manufacturer has established as safe for full duty cycle operation you also must be sure that you do not overdrive the audio chain into your radio also be sure that you do not have rf coming back into your audio chain let s say this again yes 100 watts is acceptable and sometimes completely needed to make the qso reliable don t let anyone convince you otherwise get on the air and stay around for a while keep trying the resulting ragchew could be very well worth the wait website text layout licensed under cc by nc sa 4 0 copyright 2023 2026 nw7us tomas hood some rights reserved v 2 5 13 help center direct web feedback