* A Remarkable Amateur Radio Presentation - LinHT at OpenAlt 2025 * Brief Update on KK7NQN Transcriber Service Node * Stixs Radio * Librephone Project * FreakWAN * Matchbox APRS * W1BTR Radio Programming Services ZR is an independent Amateur Radio newsletter. #hamradio

* LinHT: An Open-source SDR Handheld Radio * MESHCON 2025 Wakeup Call to AR * Test Bench In A (Handheld) Box * direwolf Rel 1.8 * IP400 * 44Net VPN Update * New AllScan Units * The Comm 11/12 2025 Issue * FutureGEO * SDR-Hub * MMDVM 2025-10 Update * Hackaday Superconference Comm Badge #hamradio

* The AR World Has Changed For Me * Followup on How to Get (Re) Started in AR Data Comm * Vero Telecom VR-N76 - Flat Audio! * FreeDV’s Baseband FM * OpenMesh Voice Network * Why Mesh Networks Break * Packet Radio Interface from KM9G! * DigiPi 2.0 * Raspberry Pi Compute Module 0 #hamradio

* AR is Missing the SDR “Forest” by Focusing on the Legacy “Trees” * My slide deck from my Pacificon 2025 presentation * Pacificon 2025 ZR Interesting exhibitors, etc. ZR is an independent Amateur Radio newsletter, now in its 5th year with 3200+ email subscribers. #hamradio

Hello followers - apologies that I'm four issues behind posting here on Bluesky. Things are back to "normal" here at Zero Retries Galactic Headquarters (well, what passes for normal, anyway) so regular notifications should resume this week.

* Why Manufacturers May Be Reluctant About VHF / UHF / Microwave SDR “Real Radios” * VARA FM Via FM Repeater * FCC FACT SHEET In re: Delete, Delete, Delete * Help Track Our Light Sail! * Jesse WB2IFS Keynote at GRCon 25 * OpenRTX 0.4.2 * open.space * Hush - An Open Source Alt to VARA-HF #hamradio

* VHF-UHF Packet Path Predictions * Why Should You Consider Joining TPRFN * How To Get (Re) Started In Amateur Radio Data Comms * Wow@Home * STARS-Me2 CubeSat * ARDC YouTube Channel * DARPA Packet Radio Network Protocols * GRF5604 RF amp boards * Review: futureGEO Workshop 2025 #hamradio

* What’s New at DLARC - 2025-09 * Voice over Packet (VoP) * The SW Based Future of AR * Polar Modulation * LinHT – First GRF5604 RF Amp Tests * RPi 500+ * BCR-220 Repeaters On Sale for $600 ZR is an independent Amateur Radio newsletter, now in its 5th year with 3200+ email subscribers. #hamradio

* Zero Retries Digital Conference 2025 Wrap Up * Zero Retries Digital Conference 2025 Debrief - Part 1 Zero Retries is an independent Amateur Radio newsletter, now in its fifth year with 3200+ email subscribers. Radios are computers - with antennas! #hamradio (Apologies for this late posting.)

Special issue... * Observations from GNU Radio Conference 2025 - Tersely Zero Retries is an independent Amateur Radio newsletter, now in its fifth year with 3200+ email subscribers. Radios are computers - with antennas! #hamradio (Apologies for this late posting - it's been a busy few weeks.)

* AR At GRCon * AllScan.info Products * AllStar Revisited Series * HF Station on Frying Pan Tower in Atlantic * ebook - Signal Processing Recipes for Comm Systems * ARRL Lab Helps RAs Avoid Interfering With US Space Force Radar * RADE compared to SSB * AREDN® Network Beginner’s Guide #hamradio

* KK7NQN Transcriber Service Node * Build It And They Will Come Doesn’t Work * Tech-Focused Hams * Meshcore In Surrey, BC * Low Drive VHF / UHF Amps * Icom ID-5200 * ka9q-radio and Rig Expert Fobos * DB0UV - Unique V/UHF Xpndr * LiNK500 * Real-Time Beamforming With SDR * T41-EP SDT Modular HF SDR

* ZRDC 2025 Update * First LinHT Tests * LinHT – Open SDR HT * Demo LinHT M17 Decode * ARRL Tech Awards * PACKRAT * patty AX.25 stack * IPv6 /48 Subnets for Hams * JNOS 2.0q * KV4P V2 * AREDN Dev Plans * MMDVM Update * AR Needs a DEF CON? * AMSAT-SM wants a FD HT * AllStarLink Appeal For Donations

* ZRDC Update * What’s New at DLARC * LinHT - Technological Innovation In Amateur Radio * A Modest Proposal * The AR Future Systems Skunkworks * Mesh Networking * AMSAT-CA Quietly Comes to Life * AREDN at DEFCON 2025 * N2IRZ “Returns” to “Print” * CS7000 M17 New Features #hamradio

The Zero Retries email subscriber count just bumped up to 3100 (was 3000 less than a week ago). Apparently someone said something nice about Zero Retries, or perhaps it's just more "late listeners" to Ham Radio Workbench Episode 242 - www.hamradioworkbench.com/podcast/hrwb... Wow!😜

* 3 New Pseudostaffers * ZRDC 2025 Update * Additional Details on 802.11ah in AREDN * 1.5 New NinoTNC Derivatives * ARDC Grants List Updated * Starlink Beam Switching Upgrade * Decoding Meshtastic with GNURadio on RPi * Hamshack Hotline Users Invited into Hams Over IP * vARIM Messaging Program

* 3000+ Subs! * HRWB Episode 242 * ZR Guide Submitting FCC Comments * ZRDC 2025 Update 08/01/2025 * Notes From The M17verse * 12M Obs by SatNOGS * Build a Modern Digi * SF-HAB at OS 2025 * AREDN Support for 802.11ah * HamTV On ISS * GPS on the Fritz? Maybe eLORAN? #hamradio #M17project

Just updated the profile to say that Zero Retries now has 2900+ email subscribers! Thanks very much Ham Radio Workbench Podcast for sending fellow fans of Advanced Amateur Radio to check out Zero Retries!

Tina KD7WSF and I were interviewed on the Ham Radio Workbench podcast, now available: HRWB 242 - Zero Retries Newsletter with Steve N8GNJ and Tina KD7WSF

* We Showed Up for Comments on FCC SB Docket 25-201 * M17 Moves Past Mainstream MMDVM Support * WPSD M17 Comm Fork * N7TAE mspot * LinHT (Formerly, OpenHT) and CC1200 M17 Hotspot * Open Commu Org (AM CELL) * RRI, ARRL Sign MOU ZR is an indy Amateur Radio newsletter. #hamradio #M17project #fcc

* MMDVM Versus M17 * Comments to FCC re: AST SpaceMobile Claiming 430-440 MHz For Its Use Are Due Monday 2025-07-21 Zero Retries is an independent Amateur Radio newsletter, now in its fifth year with 2800+ email subscribers. Radios are computers - with antennas! #hamradio #M17project #mmdvm

* ZR Enters Its 5th Year * What’s New at DLARC — Packet Radio History * Comment Period Open for Ten More Days re: AST SpaceMobile * Year 5 of the ZR Experiment In Progress * Hamshack Hotline Sunsets * Bitchat Messaging App Works * VarAC V12 ZR is an independent Amateur Radio newsletter. #hamradio

* VARA FM - 12.5 kHz vs 25 kHz * Jim Boddie NG2J SK * ADRCS Press Release re: IP400 * SARC Comm, 7/8 2025 * Radio Module 2 and DreamHAT+ * HydraSDR RFOne * OpenWrt ampr-ripd package * Seeed Studios reRouter Zero Retries is an independent Amateur Radio newsletter. #hamradio #HydraSDR #sdr

* ZRDC 2025 Registration Now Open * AST SpaceMobile Lays Claim to 430-440 MHz and 902-928 MHz for Commercial Sat Comms * Details About Data Over DMR * 2025 June - State of the APRS Foundation (YouTube) * Update on AR Power Amps * QRadioLink - Multimode SDT App * HackRF Pro Announced #hamradio

* The TPRFN Network * Oh, The Signals You’ll Make * AR’s Lack of Imagination re Rptr Tech * Retevis Ailunce H1 DMR Radio * APRS101.pdf is Obsolete * Weather Radiosondes * Rig Supt for 9600 BAUD Packet * Universal Radio Hacker * QRP Labs Polar Modulation ZR is an independent Ham Radio NL. #hamradio

* What’s New at DLARC * M17 - N8GNJ’s Perspective * Followup On SFRs * IP400 Press Release * APRSF Zoom Call * Reasonable UPS with USB and 12V * Packet Commander app * Skyroof Sat Track / SDR software * Improving the CS7000 M17 PLUS Zero Retries is an independent Amateur Radio newsletter. #hamradio

* Raspberry Pi 5 Porch Ops * Minor Scoop About FlexRadio’s Impressive Engineering * Thorough Explanation of Single Frequency Digital Mobile Radio Repeater * Data Repeaters * Hot Iron #129 is Posted to the Website Zero Retries is an independent Amateur Radio newsletter. #hamradio

* A Few Last ZR Impressions of Hamvention 2025 * ARDC Priority Areas for Funding - R&D * The Importance of Internet-connected Systems for Ham Radio Community * M17 Conference 2025 – Talks and Stands * futureGEO Workshop Scheduled * Western CO Data Rptr * New Dev Work on JS8Call #hamradio

* Hamvention 2025 - Zero Retries Impressions * FlexRadio Aurora * FreeDV Radio Autoencoder * Rhizomatica Mercury Radio Modem Software * Timebot (aka, Virtual Time Nut) * In Person Debut of IP400 Network Project at Hamvention 2025 Zero Retries is an independent Amateur Radio newsletter. #hamradio

* Unexpected Conversations 1 * Video Field Recording * Hamvention 2025, Briefly * Getting Started with Ham Radio on Raspberry Pi Zero Retries is an independent Amateur Radio newsletter. #hamradio

Apologies to my followers here that I haven't been diligent the last three issues for posting them here. Will update that in now.

* AR Isn’t Having All The (Radio) Fun * New Types of New AROs… and Their Expectations * SDR++ with Digital Speech Decoder * Are Multi-Carrier Data Modes Illegal in AR? * Langstone (V2) VHF / UHF SDR Project * Meshtastic Publishes Special FW for Hamvention 2025 * AREDN Production Release 3.25.5.0

Zero Retries 0200 - www.zeroretries.org/p/zero-retri... * 200+ Issues of ZR * What’s New With DLARC * IP400 Ichiban - The Big Reveal * ZRDC Update * LinuxFest Northwest 2025 * Reintroducing the [Apache Labs] ANAN-10E * Introducing Project mini-shack * Put an Old-School BBS on Meshtastic Radio

* JFMDNA Webinar - IP400 and the Digital Future of Amateur Radio * Problems Reported with Early zBitx Units * New 6m-20m, 6-band Hen-Delta DX Antenna R&D Project * Need a High Power Rig for Your DigiPi? * XetaWave - Vendor of Made In USA 217-222 MHz Data Radios * Streaming Video via HF

Review of the new SG Lab 5.6 GHz Transverter... ei7gl.blogspot.com/2025/04/revi...

* Credit Where Due - “Seattle” Inspirations for IP400 * IP400 Update 2025-04-18 * SDR is THE Imperative for US AR * Comments from FCC GN 25-133 * A Vision for Open Innovation: ARDC’s Strategy Zero Retries is an indy newsletter re: tech innovation in Amateur Radio - 2600+ subs. #hamradio

* My Comments to FCC on GN Docket 25-133 * Hamvention 2025, Ho! * VarAC V11 Zero Retries is an independent newsletter now in its fourth year of publication, with 2600+ subscribers. #hamradio (URL was checked carefully before posting.)

* Zero Retries Digital Conf * AB2KT SK * National Amateur Radio Alliance * HamSCI Meteor Scatter QSO Party * Filing for 219-220 Band Rules Changes * Simple Cross-Band Digital ATV Rptr * New SDRs From China * VHF to Microwave Multi-Mode Transceiver * Appalachian Trail Golden Packet Event

* IP400 Software v1.0 Released * Write for The SARC Communicator * Excerpts from ARDC 2024 Annual Report * TIDRADIO H3 5W Multi Band Portable Radio * FOSDEM 2025 video on Hamnet Now Available Zero Retries is an indy newsletter promoting tech innovation that is occurring in Ham Radio. #hamradio

* HamSCI 2025 * From FCC - IN RE: DELETE, DELETE, DELETE * Web Based decoders for horus and wenet * Introducing rpi-image-gen * SDRBERRY Review * VarAC, and VARA Modem on a RPi 5 ZR is an indy newsletter promoting tech innovation in Amateur Radio. Now in its 4th year with 2600+ subs. #hamradio

* Breaking News - From FCC - IN RE: DELETE, DELETE, DELETE * GRCon 2025 in Everett, WA * What’s New at DLARC — 2025-03 * Update on Oahu Multi-band APRS Digis * The Threat to the US 902-928 MHz (33 cm) Band from NextNav * M17Web * Two new books on SDR #hamradio

@votme.sh Added to my podcast queue! Looking forward to catching up.

* IP400 Update - 2025-03-07 * IP400 FAQs v1.1 * Trends I Hope to See in 2025 (and Beyond) - Pt 2 * ML And FreeDV * Vibe Coding * Radio Engineer Available * FCC to Explore Alternatives to GNSS ZR is an independent newsletter promoting tech innovation that is occurring in Amateur Radio. #hamradio

* Announcing the ZR Store! * Other AR VOIP Services * Why Hasn’t Anyone Tried to Develop Something Like IP400 Sooner? * AR Over Different “Radio” Mediums * DigiPi V1.9-3 * Bald Yak, Universe 10, How Does All Fit Together? Zero Retries is an indy newsletter in its 4th year with 2500+ subs. #hamradio

* Update on M17 Foundation * AREDN Updates * ESPARGOS: ESP32-based Wi-Fi Sensing Array * Yaesu FTM-6000R review * Russia Is Hijacking US Mil Sats * Open Source D-Star using Codec 2 * Linux's WiFi Maintainer Stepping Down ZR is an indie newsletter now in its 4th year with 2500+ subs. #hamradio

* 2500 Subs! * What’s New at DLARC - 2025-02 * Use Case for Data Over Rptr - Pt 4 * AREDN Rel 3.25.2.0 * 44Net Email, Web Hosting * Open LTE on AR? * DV - Data, or Voice? * ARDC and 44Net on HR Workbench Zero Retries is an independent newsletter now in its 4th year with 2500+ subscribers. #hamradio

* The Coming 21st Century AR Net Revolution * Updating FCC Regs for AR V/UHF * Kenwood TM-750A * Rev of the IP400 RPi HAT * RadioMail 1.5 * LiNK500 TNC * HAMNET - Status Update * RepeaterSTART App * AIOC in Next DigiPi ZR is an independent newsletter promoting tech innovation in AR. #hamradio

* IP400 Roadmap * Innovating Mostly In Software * Trends in 2025 - Part 1 * Using DigiPi with AIOC * ESP32-C5 - 5 GHz! * DragonOS_Focal Onto An Old Laptop Zero Retries is an independent newsletter promoting tech innovation in Amateur Radio. Now in its 4th year with 2400+ subscribers. #hamradio

* Canadian Innovation in AR Datacom * Update on IP400 * IP400 FAQ * M17 texting on Nokia 3310 * Tweets from Space * CaribouLite SDR HAT on a Raspberry Pi Zero Retries is an independent newsletter promoting tech innovation in Amateur Radio. Now in its 4th year with 2400+ subscribers. #hamradio

In this issue: * IP400 Project - Intros, Background, and Details * Imagining an HF Appliance Based on the zBitx * Project MINI RACK * Forgotten Internet: UUCP * APRS is NOT “Worthless” Zero Retries is an independent newsletter promoting tech innovation in Amateur Radio. #hamradio