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After looking through things for quite some time, and asking around, I was able to find the following, assuming that I can get a copy of the signed certificate from somewhere. There is some more information at this blog article, and this GitHub site. The log file is done in a format called GAbbI (Global Amateur Interchange). This file format is similar to ...


3

The closest I could find to a specification for FT-8 was on the Wikipedia page for WSJT. In answer to your second question. I lead an open source project that is designing an implementation of the DVB-S2 and DVB-S2X protocols for amateur terrestrial and space use. The uplink is frequency-division-multiple-access. The downlink is the time-division-...


3

Since you tagged your question with GNU Radio, I am assuming that is your SDR software package. If you look under level controllers, you will find a function block called "Power Squelch". This function: Sets the threshold (in dB) where the squelch control switches between MUTED and UNMUTED states. If Ramp is enabled, there in an ATTACK state between MUTED ...


2

"Is it possible to generate rf by directly programming a pc parallel port?" Yes, you can. In fact any "alternating current" will produce RF, and a "port" (parrallel or other) from a "computer" can do this... but... (there is always one, isn't there?) You will have to ensure that you are filtering intermodulation, harmonic's and so on so forth, before ...


2

Just use pavucontrol to redirect the audio output from gnuradio to the audio input of baudline, shouldn't take more than a minute. Creating gnuradio blocks is a mission, and that's without integrating with something like baudline, which I don't even think is possible.


2

This may not be a direct answer to the question but since a comment suggested a book, let me suggest some others that I have in my library. First, what I think is the most practical for hands-on programming: "DSP Software Development Techniques for Embedded and Real-Time Systems" by Robert Oshana and published by Newnes. My copy is copyrighted 2006 and I ...


2

The data is AM modulated on the 2.4 kHz subcarrier, with 256 different levels representing a single value from 0 to 255. It's a scanline every 1/2 second from the cameras with sync and telemetry data added to the beginning and end. Each line is 2080 data points (words) long, so it broadcasts at 4160 baud. The sync lines at the beginning let you know when a ...


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I do have the specification for JT9 if that is of interest to you. It is currently in the form of a pdf. Would you like it emailed to you? Or would you prefer I paste it on this forum as ASCII text (where the formatting is a bit strange, but...


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There are accessories for some radios that provide a speech capability. Here is a link to a wen site, HamRadioAndVision, that has some information. https://www.hamradioandvision.com/accessible-transceivers-vision/ Also keep in mind that a person can be legally blind but still have some sight. I believe that a person with 20/100 vision is considered to be ...


1

I'll answer the first part of your question, Ronald. I once witnessed a blind ham (WD8PIC) operate. His solid-state transceiver had a speech synthesizer that audibly spoke the frequency when the front-panel SPEECH button was pressed. What is more, he had everything on the front and back panels memorized. It was simply amazing how much he was able to do for ...


1

I don't believe FT8 has a complete specification besides the source code, which is openly available. RTTY is an option. It doesn't need much of a specification since it's so damn simple. PSK-31 is marginally less simple. ARRL hosts a specification, among others. The QPSK variant has very basic FEC. On HF, I don't know what more exists which may qualify as ...


1

The TX channels are separate from the RX channels. Hence, there will be a singkle, dual-stream RX streamer, and a single, dual-stream TX streamer. The subdev strings in your pseudocode aren't doing what you want; docs. You also don't need them – if you request a dual-stream streamer, the default behaviour is to count them ascendingly. So, if you just get ...


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The developer introduction has an overview and links to further resources. If you can link against a C++ library, you can use TrustedQSL to deal with the signing portion, or read the code to understand the process and create a Java version of it.


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I'm one of the TrustedQSL developers. We currently have a C library (tqsllib) that you could link against with JNI, but we don't have a Java port of it and aren't really planning to do one. Most people writing code against LoTW to use the command-line interface to TQSL, explained here: http://www.arrl.org/TrustedQSL/tQSL-help/cmdline.htm If you decide to ...


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