Operating RTTY and especially RTTY contesting has quickly become my favourite facet of amateur radio. I started operating RTTY in 1984 using a Dragon 32 (6800 CPU) computer and G4BMK software and Terminal Unit. My interest then waned until 2002 when I discovered MMTTY and N1MM. Operating RTTY and especially RTTY contesting has quickly become my favourite facet of amateur radio. I started operating RTTY in 1984 using a Dragon 32 (6800 CPU) computer and G4BMK software and Terminal Unit. My interest then waned until 2002 when I discovered MMTTY and N1MM. Download Rtty Mac Software Fldigi v.3.12.4 Fldigi is a modem program for most of the digital modes used by radio amateurs today: CW, PSK, MFSK, RTTY, Hell, DominoEX, Olivia, and Throb are all supported. It can help calibrate a sound card to a time signal and do frequency measurement. Rtty software by Title Popularity Freeware Linux Mac.
- MMTTY
For FSK troubleshooting:
Unlike the MMTTY stand-alone program, you must set the COM port the interface is connected to in the Ports menu of the Rttyrite window. For a better explanation of this see my RTTY Starter page 6 at: http://www.rttycontesting.com/rttystarter06.html
If you have the Port setting in the Rttyrite window set to the correct COM port the interface is attached to, then you have to check to see if the interface itself is working. It's best to check this with an O-scope paralleled across the interface output that goes to the radio's FSK input. To check what the waveform should look like, refer to my 'Getting Started on RTTY' tutorial and Diddles & Troubleshooting page http://www.aa5au.com/rtty_diddles.html. When you key MTTY with WriteLog (or MMTTY stand-alone), it will send a constant stream of diddles.
If you don't have on O-scope, you can do it with a regular voltmeter. With everything in the idle condition, you should see some kind of floating voltage,
say 5 volts. Then key the transmit of MMTTY with WriteLog and you should see a fluctuation in the voltmeter. This normally tells you that your interface is working correctly, but doesn't prove it as well as an O-scope.
If that checks good, you have to check the FSK circuitry in the '570. Since the '570 does not allow you to 'monitor' FSK transmission, you must monitor it with another receiver tuned to the same frequency.
With your radio in the FSK or RTTY position:
Take the FSK input lead and ground lead and keep them open. Key the transmitter manually and listen to the frequency of the tone being transmitted. It will be
either a mark 2125 or a space 2295 hz. Now directly short the FSK input to the radio to ground with the transmitter still keyed and you should hear the tone
shift 170 hz either high or low. Depending on how you have your FSK polarity set in the radio, an open may produce either a mark or space. A short of the FSK input of the radio should shift the tone 170 hz. If there is no difference between a short and an open, then the FSK circuitry is not working, but that's rare. I
had it happen to one of my TS870's once but that was after a lightning strike.
With AFSK, it's simple audio from the sound card to the audio input of the radio. If you have audio coming from your sound card, then you should be able to
transmit AFSK with your radio in the LSB position.
Hope this helps,
Don AA5AU
- MMTTY
For FSK troubleshooting:
Unlike the MMTTY stand-alone program, you must set the COM port the interface is connected to in the Ports menu of the Rttyrite window. For a better explanation of this see my RTTY Starter page 6 at: http://www.rttycontesting.com/rttystarter06.html
If you have the Port setting in the Rttyrite window set to the correct COM port the interface is attached to, then you have to check to see if the interface itself is working. It's best to check this with an O-scope paralleled across the interface output that goes to the radio's FSK input. To check what the waveform should look like, refer to my 'Getting Started on RTTY' tutorial and Diddles & Troubleshooting page http://www.aa5au.com/rtty_diddles.html. When you key MTTY with WriteLog (or MMTTY stand-alone), it will send a constant stream of diddles.
If you don't have on O-scope, you can do it with a regular voltmeter. With everything in the idle condition, you should see some kind of floating voltage,
say 5 volts. Then key the transmit of MMTTY with WriteLog and you should see a fluctuation in the voltmeter. This normally tells you that your interface is working correctly, but doesn't prove it as well as an O-scope.
If that checks good, you have to check the FSK circuitry in the '570. Since the '570 does not allow you to 'monitor' FSK transmission, you must monitor it with another receiver tuned to the same frequency.
Art Software For Mac
With your radio in the FSK or RTTY position:
Take the FSK input lead and ground lead and keep them open. Key the transmitter manually and listen to the frequency of the tone being transmitted. It will be
either a mark 2125 or a space 2295 hz. Now directly short the FSK input to the radio to ground with the transmitter still keyed and you should hear the tone
shift 170 hz either high or low. Depending on how you have your FSK polarity set in the radio, an open may produce either a mark or space. A short of the FSK input of the radio should shift the tone 170 hz. If there is no difference between a short and an open, then the FSK circuitry is not working, but that's rare. I
had it happen to one of my TS870's once but that was after a lightning strike.
Fsk Rtty Software For Mac 10
With AFSK, it's simple audio from the sound card to the audio input of the radio. If you have audio coming from your sound card, then you should be able to
transmit AFSK with your radio in the LSB position.
Hope this helps,
Don AA5AU
