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Super RTTY Audio Filter MFJ-725 Amateur-D MFJ Enterprises;
https://www.radiomuseum.org/r/mfj_super_rtty_audio_filter_7.html
MFJ Enterprises; Super RTTY Audio Filter MFJ-725 (1) Technical Specifications Wave bands - without Power type and voltage Line / Storage batteries (perhaps also batteries) / 12 Volt Loudspeaker - This model requires external speaker (s). Power out 0.15 W (unknown quality) Material Metal case from Radiomuseum.org
Getting Started On RTTY - AA5AU
https://aa5au.com/GettingStartedOnRtty.pdf
By using the FSK input to your transceiver, you can then operate the radio in the RTTY or FSK position and make use of filters available for receiving RTTY, such as a narrow 250hz or 500hz IF filter. In most cases, when using AFSK, your radio will be placed in the LSB position (although some, especially in Europe, prefer using USB).
RTTY Filters
http://www.w7ay.net/site/Technical/RTTY%20Demodulators/Contents/filters.html
RTTY Filters It is known that a Matched Filter is optimal under additive white Gaussian noise (AWGN) conditions. A matched filter is one whose impulse response is the time inverted version of waveform of the actual signal that is to be decoded.
High-performance RTTY filters 1
https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1966/08/page16/index.html
Since the RTTY signal is a pulse-modulated f.s.k. carrier, it does exhibit a certain bandwidth. The modulating signal consists of a fundamental frequency determined by the pulse rate, with harmonics determined by the pulse shape. The fundamental audio frequency for 22-ms. pulses will be approximately 22.5 cycles.
A RTTY Tutorial for beginners - IW5EDI Simone - Ham-Radio
http://www.iw5edi.com/ham-radio/26/a-rtty-tutorial-for-beginners
A RTTY transmitter sends out a carrier that shifts back and forth between two frequencies. There is no amplitude modulation, only a pure carrier which shifts frequency. The lower RF frequency is known as the SPACE frequency and the upper RF frequency is known as the MARK frequency. The difference between the two is known as the SHIFT.
Page 3 – Receiving RTTY - rttycontesting.com
https://www.rttycontesting.com/rtty/page-3/
There is a big difference in the quality of audio coming from a commercial or home-brew audio filter and the audio coming straight out of your PHONES jack. Cleaning up the audio before sending it the Sound Card will prove wonders when copying RTTY, especially weak signals.
Page 03 – Receiving RTTY - AA5AU
https://www.aa5au.com/rtty/getting-started-on-rtty/page-03/
There is a big difference in the quality of audio coming from a commercial or home-brew audio filter and the audio coming straight out of your PHONES jack. Cleaning up the audio before sending it the Sound Card will prove wonders when copying RTTY, especially weak signals.
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