* Preempts DigiDX, usually heard at this time Saturday 13 August 0030-0100 UTC on 7730 kHz (285 degrees azimuth) Via WRMI’s transmitters at Okeechobee, Florida, except where noted: You can decode this WRMI special broadcast as it is broadcast, or from your recording. In newer versions of Fldigi, also right click on RxID and select Passband. To make Flmsg work with Fldigi, in Fldigi: Configure > Misc > NBEMS > under Reception of flmsg files, select Open with flmsg and Open in browser, and below that indicate where your Flmsg.exe file is located – probably somewhere in Program Files(x86).įor correct decoding of the languages with diacritics, or using non-Latin alphabets, in Fldigi: Configure > Colors & Fonts > RxTx > in the Rx/Tx Character set menu, select UTF-8.įor Fldigi to automatically select the mode and the center audio frequency of the mode, select RxID (upper right of the interface) by left clicking. Īnd you will use the companion program Flmsg.
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To decode the modes on the WRMI broadcast, Fldigi software is recommended. The program will include MFSK images, examples of non-Latin alphabets, and an Flmsg transmission. There will also be segments in MFSK64, MFSK32 centered on 2200 Hz, and Olivia 64-2000. The broadcast will mostly be in MFSK32 centered on 1500 Hz. It puts all the text back into the proper fields so that the received message is a duplicate of the message created by the originator who also used FLmsg.WRMI, Radio Miami International, will showcase digital text and images via analog radio in a half-hour special broadcast to be transmitted nine times (at least), beginning Saturday, 13 August. The “wrap” function includes a checksum for the message enclosed by commands that allow FLdigi to recognize the message and automatically save itġ5 ICS-213 message received in the previous slide using a microphone held close to the speakerįLmsg is used to open the received message.
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Uses FEC (Forward Error Correction) giving it an advantage in poor signal conditions Not really useful for a keyboard-to-keyboard QSO due to long FEC decode time (several seconds) Three bandwidths used: 500 Hz for HF, 1000 Hz for HF under excellent conditions, 2000 Hz often used for VHF/UHF FM Speeds vary: 50 wpm for MT63-500, 100 wpm for MT, and 200 wpm for MTġ2 MT-63 Computer and audio interface requirements are the same as mentioned for PSK-31 Best free software for MT-63 use is FLdigi FLdigi includes additional modules optimized for the error free transfer of text message files Error free message transfer ability makes it an excellent choice for emergency communications MT works very well over 2m FM simplex and also through a repeater FM radio interfacing can be done acoustically!! A real bonus for emergency communicationsġ3 MT-63 MT signal on 20m MT audio clip To fit within the audio pass band of an SSB transmitter, an MT signal uses tones from 500 Hz to 2500 Hz
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Notice that you can count out to the 15th harmonic and it is splattering over 500Hz taking out at least 6 PSK31 QSO'sġ0 PSK-31 QRP The Small Wonder Labs PSK80 Warbler is a small 3W 80m QRP transceiver that covers 3580 to 3581 KHz uses computer soundcard, and serial port to key TX Signal at 1000 is overdriven with multiples of 31 Hz on either side of center – about 185 Hz wide Waterfall screen shot below is an example of a badly overdriven sound card. One of the best is the SignaLink USB which includes its own soundcard and transceiver keying and only needs a USB cable to the computer (powered by the USB cable)
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2 PSK-31 Was created by Peter Martinez G3PLXīased on RTTY style of communications, and is useful for keyboard-to-keyboard QSO’s Data rate of baud or about 50 wpm Total bandwidth of about 50 Hz (with proper equipment setup and adjustment) Can fit at least fifteen PSK-31 QSO’s into the bandwidth occupied by one SSB QSO Uses an SSB transceiver connected to a computer soundcard and free softwareģ PSK-31 The PSK31 station consists of a combination of Software, PC, Sound Card, SSB transceiver & interface hardware Software: DigiPan, FLdigi, Ham Radio Deluxe, or many other free programs - Encodes and Decodes PSK signal tones - Controls TX PTT via the serial port PC: Laptop or desktop preferably running Windows 2000 or later operating systemĤ PSK-31 Basic transceiver to computer soundcard interfaceĥ PSK-31 Many commercially made interfaces are available
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