Author: Doug
Repairing a Marconi TF2304 Modulation Meter
A while ago, I got a cheap modulation meter from eBay from a chap in the UK – It was made by Marconi, and was a beautiful piece of gear. Unfortunately, the unit had seen better days, the…
Read More »A new display and CTCSS for the Yaesu FT-290R
I purchased a Yaesu FT-290R all mode 2M transceiver from an estate sale recently – it was the last item out the door, because it had a faulty LCD display. The radio worked beautifully, although it was marred…
Read More »NC4016 – A Forth chip ahead of its time
As a trainee i had the privilege of working with a Novix NC4000 beta Board – It used a NC4016 Forth CPU that maintained separate code and stack space, making it incredibly fast. Allowing separate busses allowed the…
Read More »Reading Paper Tapes in 2022
I have a couple of old paper tapes – I also have an ASR33 teletype, which is more than capable of reading a tape, but making the ASR33 operate correctly is a labor of love which I will…
Read More »Xiegu G90 Data
One of the delights with having multiple portable HF radios is the capacity to use different specific features that suit a particular radio over another. One particular radio that I like, is my Xiegu G90, which is a…
Read More »A 5/8th Wave Antenna for 146 Mhz.
Last weekend I did some work for WICEN with the National Capital Rally, and during the drive in I remembered how terrible access to the 146.900 Mhz repeater on Isaacs Ridge was for me in the Xtrail. Normally,…
Read More »My IMSAI is alive!!
It’s been an epic week. I got my IMSAI S100 system running. I replaced the 120v linear power supply with a couple of modern switchers – now the system is sooo much lighter, and I can plug it…
Read More »An 80188 based SBC
Last night I completed my 80188 based SBC-188 build. It is a ECB board designed by John Coffman in the Retrocomputers forum that provides an Intel 80188 coupled with 1Mb of RAM and 128k of ROM. It also…
Read More »Dracblade – A Propeller based Z80 CP/M board
A couple of years ago, a fellow named Dr. Acula designed a neat little Parallax Propeller based board that implemented a full CP/M system providing a Z80 with dual serial, 512k Ram, VGA, PS/2 Keyboard, and SD storage….
Read More »A Z180 based SBC
I recently decided to finish my Z180 based Single Board computer. It is a board named the “N8” designed in about 2012 as part of the then expanding N8VEM series of projects. It was neat because it promised…
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