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- Q15X25 abstract "Q15X25 is a communications protocol for sending data over a radio link. It was designed by amateur radio operator Pawel Jalocha, SP9VRC, to be an open communications standard. Like all amateur radio communications modes, this protocol uses open transmissions which can be received and decoded by anyone with similar equipment. Q15X25 is a form of packet radio. It can be used to interconnect local VHF AX.25 packet networks over transcontinental distances. Anyone can design or adapt the open-source software to develop their own Q15X25 system. Q15X25 is a digital signal processor-intensive mode designed to pass AX.25 packets on HF with speed and reliability much greater than traditional HF ARQ modems. It uses 15 QPSK modulated carriers separated by 125 Hertz, each modulated at 83.333 baud. Q15X25 uses forward error correction (FEC), and like MT63, uses time- and frequency-interleaving in order to avoid most error sources. The raw transmission data rate is typically 2500 bit/s.Typically the DSP based receiver and transmitter modulator or codec is implemented as PC software that uses a sound card to connect directly to an SSB transceiver. Linux implementations are usually called \"newpsk\" or \"newqpsk\". MixW, a multipurpose communications control and digital modes package on Windows can implement Kiss and/or \"TCP/IP over X.25\" on either traditional 300 baud, 1200 baud and 2400 baud FSK packet \"modems\" implemented as DSP via sound card or over Q15X25. The \"FlexNet\" Windows packet software also has a newqpsk / Q15X25 option.As with any amateur radio transmission, anyone can listen/decode Q15X25 transmissions, but an amateur radio operation license is required for transmission. Frequencies (all USB) in use are (MixW center about 1350 Hz higher):".
- Q15X25 wikiPageExternalLink q15x25.
- Q15X25 wikiPageExternalLink www.mixw.net.
- Q15X25 wikiPageID "2737347".
- Q15X25 wikiPageLength "2387".
- Q15X25 wikiPageOutDegree "14".
- Q15X25 wikiPageRevisionID "646962202".
- Q15X25 wikiPageWikiLink AX.25.
- Q15X25 wikiPageWikiLink Amateur_radio.
- Q15X25 wikiPageWikiLink Automatic_repeat_request.
- Q15X25 wikiPageWikiLink Category:Packet_radio.
- Q15X25 wikiPageWikiLink Category:Quantized_radio_modulation_modes.
- Q15X25 wikiPageWikiLink Digital_signal_processor.
- Q15X25 wikiPageWikiLink Forward_error_correction.
- Q15X25 wikiPageWikiLink Linux.
- Q15X25 wikiPageWikiLink MT63.
- Q15X25 wikiPageWikiLink Open-source_software.
- Q15X25 wikiPageWikiLink Packet_radio.
- Q15X25 wikiPageWikiLink Phase-shift_keying.
- Q15X25 wikiPageWikiLink Radioteletype.
- Q15X25 wikiPageWikiLink Shortwave_radio.
- Q15X25 wikiPageWikiLinkText "Q15X25".
- Q15X25 wikiPageUsesTemplate Template:Amateur-radio-stub.
- Q15X25 wikiPageUsesTemplate Template:Digital_modes.
- Q15X25 subject Category:Packet_radio.
- Q15X25 subject Category:Quantized_radio_modulation_modes.
- Q15X25 hypernym Protocol.
- Q15X25 type Software.
- Q15X25 type Mode.
- Q15X25 comment "Q15X25 is a communications protocol for sending data over a radio link. It was designed by amateur radio operator Pawel Jalocha, SP9VRC, to be an open communications standard. Like all amateur radio communications modes, this protocol uses open transmissions which can be received and decoded by anyone with similar equipment. Q15X25 is a form of packet radio. It can be used to interconnect local VHF AX.25 packet networks over transcontinental distances.".
- Q15X25 label "Q15X25".
- Q15X25 sameAs Q7265343.
- Q15X25 sameAs m.07__9v.
- Q15X25 sameAs Q7265343.
- Q15X25 wasDerivedFrom Q15X25?oldid=646962202.
- Q15X25 isPrimaryTopicOf Q15X25.