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KC9UMR

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Latest Post

MFJ1278 – TNC Commander QSL cards… full color, a dime a piece APRS… a New Take Day 13: El Reno, OK to Shamrock Texas – the last day Day 12: Tulsa to El Reno, OK
Radio and Electronics

Update on the 8816 Crosspoint Switch Project

2025-04-12 Ken Cechura

Finally got my SN74LV8153 chips. Did some coding in the background, but without this chip, it wasn’t value added to mess with it. Mouser is 20 or 30 miles away.…

Radio and Electronics

Yet ANOTHER Project… the MT8816 Crosspoint Switch

2025-03-14 Ken Cechura

This one’s been in the works for a long time. I’ve always wanted to play with some sort of audio routing device. I’ve worked on a number of different airplanes.…

Radio and Electronics

More 705 accessory updates

2025-02-10 Ken Cechura

In addition to the dewalt battery adaptor, I have also started using a 12 lithium jump start pack. In both cases, I had to kludge power cables…. This is a…

Radio and Electronics

Icom’s 13 pin DIN… another minor thing.

2024-07-14 Ken Cechura

Once upon a time, I bought some 13 pin DINs to wire my own cables for the Icom 706 (and also later radios). 13 pin solder cups, with my clumsy…

Radio and Electronics

Minor Modifications: Heil Icom Adaptor Cable

2024-07-06 Ken Cechura

I’ve had a Heil Proset Plus IC for quite some time – it’s comfortable, and the phase reversal switch is great for pulling weak signals out of the noise. I’ve…

Radio and Electronics

Updates… RUMLog, WSJT, WFView… MacOS

2024-06-29 Ken Cechura

It’s been a while since I’ve run RUMLOG…. but I’ve been using WFView and WSJT-X together with no issues. I wasn’t keen on the logging abilities of WSJT, so I’ve…

EMI/EMC thoughts Radio and Electronics Uncategorized

A new power supply for the Sprague 600A Interference Locator

2024-05-02 Ken Cechura

Many years ago, I was blessed to get a Sprague 600A Interference Locator from the estate of my Elmer, WB9KHR. As an EMI Engineer, this was just COOL. It was…

Radio and Electronics

Revisiting the cable modem spectrum analyzer

2024-03-28 Ken Cechura

I actually hit the front page of hackaday writing about this one, and I’m still being honest that this was NOT my discovery, I just made a few observations about…

Radio and Electronics Uncategorized

A different radio challenge…

2024-03-21 Ken Cechura

I came across a GR1225 Motorola repeater. We had a use for it, but no one knew what it was set up for. I no longer own a windows XP…

Radio and Electronics

More MacOS Radio – WinLink

2024-03-17 Ken Cechura

Yet another one I’m not going to recreate the documentation required to get it working… but here’s a couple sites with working solutions: Both of these rely on “Crossover” to…

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Recent Posts
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  • Day 13: El Reno, OK to Shamrock Texas – the last day
  • Day 12: Tulsa to El Reno, OK
Solar-Terrestrial Data
Recent Posts
  • MFJ1278 – TNC Commander
  • QSL cards… full color, a dime a piece
  • APRS… a New Take
  • Day 13: El Reno, OK to Shamrock Texas – the last day
  • Day 12: Tulsa to El Reno, OK
Recent Comments
  • Ken Cechura on MMDVM on P25…
  • Ken Cechura on Motorola MTR2000 Band Change
Archives
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  • Antique Radios
  • APRS
  • EMI/EMC thoughts
  • kitchen
  • Leadership Musings
  • MMDVM and DMR
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  • ROUTE66
  • Soundcard Interfacing for HF Digital Modes
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You missed

APRS Radio and Electronics Soundcard Interfacing for HF Digital Modes

MFJ1278 – TNC Commander

2026-09-27 Ken Cechura
Radio and Electronics

QSL cards… full color, a dime a piece

2026-09-23 Ken Cechura
APRS

APRS… a New Take

2026-08-26 Ken Cechura
ROUTE66

Day 13: El Reno, OK to Shamrock Texas – the last day

2026-08-21 Ken Cechura

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