MMTTY often fails on paths that go near or across the polar regions. Single tone happens fairly often on HF when multipath causes the cancellation of one tone leaving one available for copy. MMTTY major weakness is that it fails when only a single tone is present unlike 2Tone selective and GRITTY.
#2 tone rtty Pc
wav files it runs on my PC about 50 times faster than real time making it not too onerous to test lots of different conditions and signal to noise ratios.ĢTone works very well for most scenarios when the correct decoder is selected. This recording is then used via pathsim to simulated different propagation conditions and signal to noise ratios. I use 2Tone DOOK as the TX that is recorded sending 30,000 characters of RTTY normal amateur callsign chosen at random from master.scp. Brian is of course correct in that with any statistical exercise like comparing error rates for different decoders then lots of characters are needed with different propagation conditions as well as different sending software/equipment. Programs will differ in their ability to cope with weak signals, interfering signals, multipath, polar flutter, fading, selective fading, frequency drift, irregular hand typing, and combinations of these factors. With the words of Brian (after I introduced the first video to him): "To properly compare two RTTY receiving systems you must use a variety of signals.
#2 tone rtty software
It is in no way meant to show that nowadays Windows software is less valuable (I use MMTTY successfully for hunting down the weakest of RTTY DX signals). This test was done out of curiosity and follow-up on reports of RiTTY being able to hear deeper down the noise than terminal units and current Windows software. a 16 bit card should show even better performance) keeping its ground with 2Tone. I have to admit I am pleasantly surprised to see Brian K6STI's DOS software (with an inferior soundcard.
#2 tone rtty free
I added GRITTY in the mix (tnx Don AA5AU for your excellent tutorial which enabled me to set things up for the test).Īre the tests conclusive? Should they have been done differently (other settings, other hardware)? There are way too many variables to test them all properly - I opted for the simplest setting of very weak, stable and interference free signals (tnx Luc ON5UK for providing the on air signal). On December 1, 2020, I posted a 1st comparison test: (RiTTY-MMTTY).Ī couple of friends suggested the ultimate test would be a comparison between 2Tone and RiTTY. I found some reports on the internet about RiTTY outperforming terminal units, and also MMTTY. I remember not being impressed by using terminal units in the tropics. Earlier in the nineties, I used a PK-232 and KamPlus for RTTY contacts from Africa (9X-EL). Why the testing? In 2000, we used RiTTY during the A52A DXpedition. RiTTY is run with Standard detector, Flywheel Auto, ATC On, Autotune M (500 Hz), Squelch 0.ĢTone-GRITTY and MMTTY are run out of the box (2Tone Squelch off / MMTTY AFC-ATC on, Standard RTTY). note how deep the attenuation was - the RTTY signals were barely audible At 02:48, text (mixed with figures) is being decoded.Īt the end of the video, I undo the attenuation settings. The Marconi RF attenuator then enabled me to proceed in 1dB steps to find the point where decoding becomes erratic (you can hear the clicks of the Marconi when I switch - when decoding gets too erratic on all 4 decoders, I move up a couple dB again until decoding resumes).Īt 00:33" testing with RY-strings starts.
#2 tone rtty 64 Bit
RiTTY V4.5 (K6STI) is run on a Compaq Armada 1700 laptop with an ESS ES1869 AudioDrive sound chip (determined by RiTTY as an 8-bit A/D, Partial Mixer).ĢTone V16.11a (G3YYD), GRITTY V1.3 (VE3NEA) and MMTTY V1.68A (JE3HHT-AA6YQ) are running in N1MM+ on a 64 bit Win7 pc, i7-3770 cpu with 8 GB RAM and a Realtek ALC887 High Definition Audio card.Īudio is taken from the AF OUT and RTTY connectors from the Yaesu FT-1000MP (audio cables have been swapped between both pc's, same result).įirst images are of the RiTTY screen (right) and 2Tone-GRITTY-MMTTY screens (left), moving to the 1000MP (setting the attenuator to 12dB) and on to a Marconi RF Attenuator, bringing the signal further down by 40dB - and cranking up the volume/AF Gain of the 1000mp. This is a new video, comparing RiTTY with 2Tone-GRITTY-MMTTY: īelow follows the explanatory text that goes with the video. Tnx to Don AA5AU and his excellent tutorial, I managed to setup N1MM+ with 2Tone, GRITTY and MMTTY. After I posted a RiTTY-MMTTY comparison video, some of you suggested comparing RiTTY with 2Tone.
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