![]() The applications in the fldigi suite use TCP/IP socket 7322 to communicate between the applications.One example is that in the "fsq" mode of fldigi, you can specify a station to use as a relay for your transmissions. There is no real "networking" in fldigi, though there are some "helper" capabilities. There is no implementation of the AX.25 protocol in fldigi. fldigi has some accommodations for the wider channels of using frequency modulation (FM) (and thus, theoretically higher data rates) on the 50 MHz and higher bands. fldigi is designed primarily for operation on the narrow channels of the Amateur Radio high frequency (HF) bands 30 MHz and lower, and HF modes (single sideband - SSB).fldigi is the primary application, and the other applications in the fldigi suite are "helper" applications such as flamp (discussed here) and flrig which controls radio settings (on radios that have that capability).Thus it is "universal" "Mac fldigi" can communicate just fine with "Raspberry Pi fldigi". Thus there are interoperable implementations for Windows, Mac, and Linux (and BSD, etc.). fldigi was written in portable code, and is open source.You don't need any additional "sound card drivers", "protocol engines", etc. The fldigi suite is a self-contained suite of sound card modes and applications that are coupled / integrated with those modes.So to save readers at least some of my grief at figuring out the fldigi suite, here's my capsule explanation. The software is mostly used by amateur radio operators who connect the microphone and headphone connections of an amateur radio SSB or FM transceiver to the computer's headphone and microphone connections, respectively. Wikipedia's article on fldigi has a reasonable intro paragraph:įldigi (short for Fast light digital) is a free and open-source program which allows an ordinary computer's sound card to be used as a simple two-way data modem. (Yes, that's the author's preferred capitalization - all lower case). In my initial encounters, I had a hard time "grokking" what exactly the fldigi suite is, and what it does , and how it works. To reconstitute RadioMirror in 2021 would require cobbling together some old Windows code for the server and client, terminal node controllers (TNCs) or using DireWolf's "KISS" interface, Windows computers, etc.Īs I explained my enthusiasm for the RadioMirror concept, my friend, colleague, and co-conspirator on many of my Amateur Radio data communications experiments Bill Vodall W7NWP* verbally "smacked me upside the head" (probably a very dated cultural reference) by reminding me that there is a "RadioMirror" mode in the fldigi suite, specifically flamp (PDF). Again, as far as I'm aware, RadioMirror never quite got going, other than some experiments to prove out the concept. For convenience, here is part of the instructions I had in the previous blog post.My two articles on RadioMirror - Revisiting RadioMirror and More Thoughts on RadioMirror, constitute a reasonably deep dive on the use case, concepts, and details of RadioMirror. Next, we need to pipe the audio output to FLDIGI. In the receiver options set the mode to Narrow FM and click R by the squelch to disable the squelch. Since we’re working in the 2 m band, we can set the LNA to 0 dB in the Input Controls. Here are the settings I use: ParameterĪfter hitting Ok, look for the play button on the top left of the application to start DSP. When you first open the application, you need to configure the IO devices. Now let’s plug in our software defined radio into our receiver computer and open up gqrx. In Fldigi, go to Op mode and set it to 8PSK-125. To do that, we need to set VOX in the menu to 10. Refer to my previous post for some of the setup instructions.įor our computer to handle transmitting, we need to disable push to talk on our Baofeng. Then open up Fldigi and configure it to directly access the radio from the audio port. Plug in the audio interface cable from the Baofeng to the transmitter computer. If your computer doesn’t have a 3.5mm audio jackĭemodulates with Gqrx and decodes with Fldigi Equipment ItemĬable that plugs from the transmitter to the computer In terms of our encoding scheme, let’s play around with 8PSK. We are going to be transmitting within 145.50-145.80 Mhz which according to the ARRL Band Plan is marked as the miscellaneous and experimental section. In order to transmit, you will need an amateur radio license. Even though some of these instructions are hardware specific, I hope that the general principles will apply to whatever hardware you’re working with. In this post, I will describe a low cost way to get started with digital modes using FM.
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