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APM Audio and PTT Data Long Dist Modem I Jotron
https://jotron.com/product/audio-ptt-modem/
APM Audio and PTT Data Long Dist Modem. Part Number: 80350C. Contact. Download Highres. For transmission of voice and data over a distance more than 2 km. The modem is required where the operator position is not colocated with the …
AUDIO PTT MODEM - Fuji Metalock
http://fujimetalock.com.br/wp-content/uploads/2014/09/JOTRON-audio__ptt_modem_471302.pdf
AUDIO & PTT MODEM The Audio and PTT Modem (APM) is designed for use in ground to air communica-tion systems that requires long distance remote control of audio, PTT and control signals through a two or fourwire leased telephone line. The system consists of one local and one remote unit. Both units are 1HU high (19 inches) The remote unit will
PTT support for SoundModem. - Masters Communications
http://www.masterscommunications.com/products/radio-adapter/faq/ptt-soundmodem.html
PTT is derived by toggling GPIO3, and that in turn keys a transistor that keys the radio. Unlike VARA FM, some extra stuff needs to be done to SoundModem to make the PTT work. The following instructions will help with that. For PTT control on UZ7HO Soundmodem, you must download the PTT-dll.zip file from their website.
PTT - w7ay.net
https://www.w7ay.net/site/Applications/cocoaModem/MiscInfo/Contents/PTT.html
PTT. cocoaModem Push-to-Talk. Push-to-Talk or Push-To-Transmit (PTT) is a term used to describe the process of keying the transceiver between receive and transmit modes. cocoaModem is meant as a digital signal processing application and I have kept things like logging and PTT control as much as possible out of the app.
TRXPTC, a modem for inside a radio
https://www.p4dragon.com/download/SCS_Technical_Manual_TRXPTC.pdf
modem. This are mainly received (RX) audio signal, transmit (TX) audio signal and PTT. Additionally this connector has a GPS-in signal. Here any NMEA GPS device can be connected to (TTL and V24 compliant). Also the supply power for the modem board is connected here. Grounding and decoupling concept:
Radio Cable Guide - NUE-PSK Digital Modem
https://nue-psk.com/manuals/Radio_Cable_Guide.pdf
NUE-PSK Digital Modem 7.070 MHz Ham Radio (SSB Transceiver) A guide for attaching a connector to the radio cable supplied with the NUE-PSK Digital Modem. Just follow these simple instructions to connect the modem audio and PTT signals to your SSB rig. NUE-PSK Digital Modem See the following pages for details on each cable type.
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