He came back withĪnd had my first ever digital QSO in the log.
![rtty interface rtty interface](https://i.ebayimg.com/images/g/QNAAAOSwU1FZ8hoe/s-l400.jpg)
I picked a suitablly loud W2 station and sent my callsign a few times after his CQ TEST. I connected the radio to the amplifier and suddenly I had about 200 watts of RTTY signal on the air. I checked the signal on the scope and it looked nice and clean. I fiddled with the potentiometer in the interface until the audio to the radio was producing a couple of watts output. Ok, so now I needed to setup for RTTY transmission. I clicked a button in fldigi and it reverses the tones, so that LSB looks like USB. I tried every combination until I realized that RTTY is transmitted on Upper Sideband. That said, everything seemed to work fine, so I pressed on without audio isolation.įirst of all, once the interface was built, I could not find any PSK signals. So I thought I needed to buy another isolation transformer. This link is listed in our web site directory since Monday Jun 17 2002, and till today ' Rtty interface (FSK/AFSK) with sound cards ' has been followed for a total of 9076 times. The main category is Sound Card Interfacing that is about Sound Card to radio interfaces. 14.35 - Psk-31 Easy Digi Sound Card Interface. I bought an isolation transformer for the audio signal, but I realized that the computer ground is still connected to the radio through the receive audio cable. The resource is currently listed in in 2 categories. 14.35 - Psk-31 Easy Digi Sound Card Interface Psk Rtty Sstv Nbems Jt-65 Hf Vhf Uhf ebay Electronics. It was simple to construct and works well. It's based on a couple of circuits I found online.
#Rtty interface serial
I don't have a serial port from the computer, so I put together a simple PSK interface to key the radio when the audio signal is detected. Would that work with the home made radio? I wanted to try transmitting back of course. Even though my radio is homebrew, it is pretty stable, the vfo barely drifts after it has been warmed up, and the fldigi program tracks any small changes in frequency.
![rtty interface rtty interface](https://www.rigpix.com/textandimaging/helmholt_interfacemark5s_inside.jpg)
I fired up fldigi and was able to copy PSK signals on 40m. It plugs into the USB port and gives me a microphone input. It does not have a soundcard, so I ordered a really cheap USB soundcard interface. It's fairly slow but its nice to have a dedicated computer that just sits by the radio. It runs my logbook program and allows me to look up a few things on QRZ.COM.
#Rtty interface mac
I use an old G4 Mac Laptop in the shack right now. On the bench: 2012-Feb-15 - Building an Interface and Working PSK (and RTTY)