LA2YUA – RF and related projects

This is a cute little clock intended for OEM precision timing, let's look at how it's built.

After some time with my modified Comtac-a-like Sporttac setup, I found a good deal on a few proper noise reducing 150 Ω dynamic microphones. In order to use them, I had to modify my setup a bit.

This post details how to modify the band split for a Motorola GP2000 UHF portable radio.

The D-LI90 battery is a fairly standard DSLR battery used by Pentax/Ricoh for most of their medium to high end DSLRs from the last 10 years or so, including the K-7, 5, 3, and 1. Since I started using my 300 mm F/4 lens I've noticed that performance across my…

One of the issues with building an RF Over Fiber system is the lack of affordable transmitter solutions. While detectors are extremely cheap, the transmitters can cost hundreds of dollars on the used marked.

The (3M) Peltor SportTac is a common low cost hunting/general purpose medium protection (~26 dB) ear protector headset with hear-through amplifiers.

Token Ring is dead? Long live Token Ring!

I had bought an AAUI 10BASE2 transceiver, mainly to get the AAUI cable for use with another device.

Inside were no major surprises, but still hopefully interesting.

The Pro Logic Audio Card, sometimes known as the 442 Audio Card, is the default computer interface card to drive the previously discussed Pro Tools Audio Interface unit.

Some notes about the HyperDisk 40 pin IDE DOM SSD The Hyperdisk SSD is a solid state storage drive, intended for industrial uses. It's a very compact module that normally plugs directly onto the motherboards 40 pin IDE header (44 pin variants also exist). The module uses a small connector…

The Apple Ethernet NB Card is high end a NuBus Ethernet card, with the A/ROSE 68k coprocessor system included to offload certain processing tasks from the main CPU. Unfortunately, the card is cursed with the spectre of libertarianism. The v1.0 ROM dump is here: 341-0246 ROM. The ROM is a 27C1024,…

Some info on the miroGraph Chroma v3.3a NuBus video adapter.

In this article I'll take a look at the Digidesign Quad Audio Interface, also known as the Four-By-Four.

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.

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.

This article is about modifying the HP 3456A voltmeter for 50 Hz operation.

I bought a used Icron USB Ranger 2212, and took a look at how they implemented the Cat5 extender.

In this article I'll briefly talk about my newest Mini-Whip antenna project, designed primarily to cover the lower bands.

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.

A collection of various info and thoughts about the Orion radio system, also sold under GE and M/Acom brandings.

Quick post with some information on MX1000/2000 programming that I wasn't easily able to find myself.

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.

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.

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