Mobilinkd

@[email protected]
384 Followers
17 Following
102 Posts
Highly mobile packet radio
Websitehttp://www.mobilinkd.com/
Storehttps://store.mobilinkd.com/
Githubhttps://github.com/mobilinkd
Twitterhttps://twitter.com/mobilinkd
MobilinkdMar 29, 2025
Can someone explain why one would design a PSU to have a full bridge rectifier installed like this? The AC pins are purposely shorted. This was found in a TekPower switching power supply (two of them). #electronics
Show threadMobilinkdDec 31, 2024
Really appreciate everyone's feedback on the SMA feedthrough to the shack. This is the result. Made 4 custom SMA keystones using keystone blanks and SMA bulkhead connectors. These fit into a 4-port Decora keystone insert. #hamradio
MobilinkdDec 30, 2024
My first computer programming book purchase from many decades ago.
MobilinkdDec 18, 2024
Our redesigned TNC cable for ICOM radios are a good fit for the deeper ID-50/ID-51/ID-52 socket.
MobilinkdAug 12, 2024

RIP little #STM32 Nucleo board. You have served me well. You did not deserve the abuse you received in my careless hands.

I killed the serial TX pin while using it for clock output, probably by clumsily shorting PA2 (A7) to +5V while probing it. Now measures 0 ohms to ground.

MobilinkdAug 3, 2024
Easy modification to an #STM32 Nucleo32 board to allow SWO debugging while preserving LD3 functionality. This allows using SWO when debugging the NucleoTNC (http://mobilinkd.com/2019/06/24/nucleotnc/). #hamradio
NucleoTNC – Mobilinkd

MobilinkdJun 12, 2024

Custom firmware for Quansheng #uvk5 #uvk6 with support for digital modulation modes is available here: https://github.com/mobilinkd/uv-k5-firmware-custom

Turn-around time is reduced from 140ms in FM mode to 80ms in DIG mode (stock firmware is 375ms).

GitHub - mobilinkd/uv-k5-firmware-custom: A merge between https://github.com/OneOfEleven/uv-k5-firmware-custom and https://github.com/fagci/uv-k5-firmware-fagci-mod

A merge between https://github.com/OneOfEleven/uv-k5-firmware-custom and https://github.com/fagci/uv-k5-firmware-fagci-mod - mobilinkd/uv-k5-firmware-custom

GitHub
Show threadMobilinkdJun 11, 2024
Eyes wide open -- Quansheng #uvk6 (AKA #UVK5) 9600 baud GFSK reception. Small HW modifications, and egzumer firmware modified for digital modulation/demodulation. #hamradio
MobilinkdJun 5, 2024
#uvk6 with modified egzumer firmware and small hardware mod can cleanly TX 9600 baud GFSK and #m17 4-FSK using TNC4. Image shows GFSK reception via GQRX and #rtlsdr. Currently working on the more challenging RX side. #hamradio #UVK5
MobilinkdAug 14, 2023

I found a regression in power consumption on the TNC4 2.5.9 firmware when testing a new batch of PCBs. The issue is high current consumption, ~900uA, when powered off.

The cause is due to undefined behavior in the STM32 USB controller when SysClock is below 16MHz.

Firmware version 2.5.7 is OK. The only change between it and 2.5.9 is an unrelated change to the power-off LED indicator. 😲

The fix requires ensuring that SysClock is >= 16MHz when making USB power changes.

Looks much better now.