
LA2YUA - RF and related projects
Digidesign/Pro Logic Quad Audio Interface (Four-By-Four (442 Audio Interface (MH031 (4x4))))
In this article I'll take a look at the Digidesign Quad Audio Interface, also known as the Four-By-Four.
Continue reading...Fun With Apple A/UX on a IIfx
I dug out the old Mac IIfx from storage and had some fun getting A/UX running on it. I had some issues, so I decided to document them and collect some links etc.
Continue reading...Precision UTC Clock Using Fiber Optic Distribution
Some viewers may have noted some 7-segment clocks in the background of some pictures in prior entries. I decided to update this system for the 2020 holiday season, and built 10 new clocks to replace 3 old ones.
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HP 3456A 50/60 Hz Modification - the easy way
This article is about modifying the HP 3456A voltmeter for 50 Hz operation.
Continue reading...Icron USB Ranger 2212 Pictures
I bought a used Icron USB Ranger 2212, and took a look at how they implemented the Cat5 extender.
Continue reading...HF over Fiber - an optical Mini-Whip antenna
In this article I'll briefly talk about my newest Mini-Whip antenna project, designed primarily to cover the lower bands.
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Icron Spectra(TM) 3022 USB 3.0 Extender REX Teardown
Around the same time that I bought the USB 2.0 extender featured previously I bought some cheap remote units for the 3022 USB 3.0 (5 Gbit/s) system.
My thought was that maybe these were identical like the USB 2.0 extender.
From the looks of it I was wrong there and will need to find a LEX to use it, but it was still interesting.
Continue reading...Icron USB 2.0 Ranger(R) 2324 Teardown
Ericsson ORION, various notes
A collection of various info and thoughts about the Orion radio system, also sold under GE and M/Acom brandings.
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Motorola MX1000/2000 Programming
More HP/Symmetricom/Microsemi 58534A-H01 pictures
I bought some more 58534A-H01 receivers and found that these receivers were of the older type I had seen low resolution pictures of before.
Continue reading...Photos of some pole mounted GPS timing receivers
On a whim I bought some pole mount GPS receivers.
Being unable to find any real details on what's inside I mostly bought them blind, so I took some photos of the insides to help others out.
Continue reading...LBQ-450 3-cavity UHF bandpass filter
I bought a chinese made 3-cavity bandpass filter and decided to measure it and compare it to some home-made modified duplexer filters.
Updated: VHF information below
Continue reading...Spectracom Epsilon Clock EC2S, Overview and Configuration
The Spectracom Epsilon Clock EC2S and similar devices are fairly high end GPS clocks/timing receivers.
I've spent a few days with one and I wrote a utility to program the device that is available for download.
Continue reading...Retuning a Procom BPF 2/3 150H Cavity Filter
A Procom VHF cavity band-pass filter was donated to the shack, and some work was done to retune it to 145 MHz.
Continue reading...The Ascom SE-140, programming and other mods
I bought some Ascom SE-140s and figured out how to program them without buying a 386 computer and floppy disks.
Continue reading...Adding Optical I/O to the Sony MDS-E12 MiniDisc Recorder
I picked up a 18 year MiniDisc recorder and restored it a bit, and added some optical I/O to it.
Continue reading...Behringer DCX2496 Failed Update Recovery
Icom IC-775DSP LED Backlight Modification
I modified my IC-775DSP with backlighting and thought you might want to as well.
Continue reading...Modifying Icom IC-V200Ts for 12.5 kHz channels
I looked in to modifying the IC-V200T for use with modern repeaters with 2.5 kHz deviation.
Continue reading...Modifying the Icom IC-H16T for 12.5 kHz Channels
I looked in to modifying the IC-H16T for use with modern repeaters with 2.5 kHz deviation.
Continue reading...Upgrading Icom H16T ROMs to Super 150 V200T Firmware
In this article I desribe how you can upgrade your H16T to use the Super-150 custom firmware developed for Icom V200T LMR radios. Be warned that some hardware modding and EPROM programming is required.
Continue reading...A Simple 3D Printed Mounting Solution for Lucent RFTG-u GPS Receiver
I've designed a 3D printable solution for rack mounting Lucent RFTG-u receivers on cheap 2U shelves.
Continue reading...Upgrading Icom CM-x battery packs with Li-Ion/Li-Po cells
To support my pile of Icom IC-H16Ts I decided to upgrade my original Ni-Cd packs to newer cells.
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