The transmit chain: the easy half, done right
From a handful of user bytes to an 1800 Hz waveform, one stage at a time, and why the easy half of the modem gets the same rigor.
Oct 4, 202616 min read5 reactions0 comments
Back to articles Oct 4, 2026 
Sep 26, 2026
Sep 26, 2026
May 31, 2026
Mar 1, 2024
Tag archive
#hamradio
Raspberry Pi Pico Revives a Discontinued Heathkit Packet Radio Modem
Raspberry Pi Pico Revives: A maker resurrected a discontinued 1980s Heathkit packet radio modem by making a $4 Raspberry Pi Pico run the exact original firmware itself.
Sep 26, 20262 min read0 reactions0 comments
Building a MIL-STD-188-110 HF Modem in Modern C++: An Introduction
A weekly deep dive into a fixed-frequency serial-tone HF waveform, one block at a time.
Sep 26, 202610 min read0 reactions1 comments
M
Jun 1, 2026Morse Code for Different Languages – Complete Guide (Filipino, Hebrew, Cyrillic, and More)
International Morse code covers the 26 Latin letters. But what about other writing systems? Each...
Jun 1, 20263 min read0 reactions0 comments
M
Jun 1, 2026Morse Code Prosigns Complete Guide – AR, AS, BK, BT, CL, CT, HH, KN, SK, SN
Prosigns are two letters sent run together with no gap — each is a single procedural signal with a...
Jun 1, 20261 min read0 reactions0 comments
M
Jun 1, 2026Morse Code Punctuation – Complete Guide to Special Characters & Symbols
Free Download: Click here to download the complete Morse code punctuation cheat sheet as a printable...
Jun 1, 20263 min read0 reactions0 comments
T
Jun 1, 2026The Complete Morse Code Alphabet – Every Letter Explained with Dots and Dashes (Free PDF )
📥 Free Download: Click here to download the complete Morse code alphabet as a printable PDF cheat...
Jun 1, 20263 min read0 reactions0 comments
M
Jun 1, 2026Morse Code Numbers – Complete Guide to All Digits 0-9
📥 Free Download: Click here to download the complete Morse code numbers cheat sheet as a printable...
Jun 1, 20263 min read0 reactions0 comments
วิธีการขอ call sign (สัญญาณเรียกงาน) ของนักวิทยุสมัครเล่นแห่งประเทศไทย ฉบับคนที่หมดอายุนานแล้ว (แบบเกือบจับมือทำ)
เล่า/บ่น ข้ามได้ จากฉบับเดิมของผมที่หมดและต้องไปต่อที่ กสทช ซอยสายลม เท่านั้น...
May 31, 20262 min read1 reactions0 comments
Running the Editcp DMR codeplug editor binary on a Mac
I've been looking for a painless way to run Dale Farnworth's excellent Editcp DMR codeplug editor on...
Mar 1, 20241 min read4 reactions0 comments
U
Sep 21, 2018Using Several Apps Simultaneously to Control a Ham Radio Transceiver
How to Control Ham Radio Transceiver from Several Apps at a Time
Sep 21, 20183 min read6 reactions2 comments