Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [software-development]

Questions related to writing software (programming) for Amateur Radio purposes.

26 questions
8
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3 answers

Does LOTW have an interface document?

I want to be able to sign my own LOTW entries, without using the provided library (My application is pure Java). Is there a document that explains in enough detail how to do this, assuming of course that I'm provided with a certificate (.tq8 I…
PearsonArtPhoto
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5
votes
2 answers

Calculating satellite passes without an internet tracker?

Situation: You want to know when a satellite will pass in order to receive an image transmission or to work an amateur satellite. However, you cannot access internet for whatever reason, and therefore can't simply look up a pass prediction chart or…
Galaxy
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4
votes
2 answers

Problem with sample rate

So I am working on a project that involves me to check real time difference between samples.I am fairly new to this so after a bit of researching I wrote a simple python script for it, here is the script. Here is the script: import time from rtlsdr…
RasenRhino
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4
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2 answers

How do blind hams operate?

In an earlier question, there seemed to be some surprise when I (indirectly) asked about radio modes accessible to a blind operator. First question: So how do blind hams operate? If I were to be blind-folded, I could not operate any of my radios,…
hotpaw2
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4
votes
1 answer

What value goes in the AX.25 PID field if the Layer 3 protocol is not defined in the standard?

I am working on space-ground networking for a Cube Satellite, and one of our candidate Layer 2 protocols is AX.25. We haven't settled on a physical layer, but it's likely to be some form of quadrature-encoded PSK. If we were using Cubesat Space…
VE9PEG
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3
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4 answers

Is there an FT8 or other weak-signal digital mode specification available?

Is there a complete and programming language independent specification available for the FT8 digital mode? Detailed enough to implement both transmit and receive SDR software from scratch in two different programming languages? If not, for what…
hotpaw2
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3
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1 answer

USRP: Are RX and TX on the same or different channel for single daughterboard?

I've got a USRP X310, currently with just one daughterboard, a WBX-120. I'm writing some C which needs to operate the radio full duplex - I receive on RF A RX2 and transmit on RF A TX/RX. But I'm confused as to how I identify which number channels I…
Walkingbeard
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3
votes
1 answer

Lack of understanding in the APRS specification for LoRa

I try to understand the APRS specification because I want to build my own APRS tracker. I took a look into this document and into this and into this project to get a better understanding. I also checked https://aprs.fi/, but I don´t understand it…
Kampi
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3
votes
2 answers

Is an Icom radio’s model ID info available via a CI-V command?

I have built a prototype device using an Arduino Nano Every which communicates (using CI-V commands) with Icom radios, to augment control of them. Currently I use the default addresses of the “target Radio” (set to 0x94 - 0x97 via jumpers on the…
anoracknophobia
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3
votes
1 answer

Looking for a Mic-E APRS encoding routine

I am looking for a Mic-E APRS encoding routine that is available for reuse in free and opensource software. I found many libraries and open source software offering Mic-E decoding, but never encoding. The old and renowned TinyTrak did Mic-E…
on4aa
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3
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1 answer

How do I write a modem for DireWolf?

I was looking at the selection of modem bauds for DireWolf and it seems the highest baud modem is 9600 baud, and I am using a sound card that can reach 48 khz. Is there any way that I can write a modem for DireWolf to utilize the 48 khz capabilities…
Steve Mucci
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3
votes
1 answer

What is the format of Yaesu FT3D's QSOPCTDIR.dat and QSOPCTFAT.dat files?

The Yaesu FT3D can send photos, but only if taken with the optional external mic that has a camera. I want to be able to send photos that come from elsewhere, by putting them on the SD card. But it seems that in addition to putting the jpeg…
Thomas
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3
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1 answer

Turning raw APT data into an image

I apologize if this question is a little out of scope for the amateur radio stack exchange but I feel like it fit better here than over in any other forum. I have successfully parsed raw PCM data out of a WAV file representing the signal received…
CL40
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2
votes
1 answer

How to trim out background noise GRC

I am creating a radio receiver to pick up "walkie talkie" chatter. success it works fine! I can hear people when they speak on the radio, the only problem i am having is that when no one is speaking the static is insane! There is very little to no…
TheHidden
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2
votes
1 answer

Is it possible to generate rf by directly programming a pc parallel port?

From what info I've found, it seems a pc parport has a max speed of ~2meg /sec ? So transmission on medium wave, to ~160 meters should be possible ? With antenna than possibly a small wire, I would think transmission range would only be a few feet…
mstram
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