The Micro-40S is a single board SSB Transceiver by Indra Ekoputro YD1JJJ. I didn’t buy one of these thankfully, but a friend brought one for some TLC. These things are supplied rather badly, ready built and working. The one that came to me had a short circuit IRF510 output PA MOSFET. An easy fix but […]
Posts in category Homebrew
Useful tips and information about making your own radio equipment.
I recently acquired a homebrew transceiver from the Angel of the North Radio Rally. It’s a 2m / 145MHz FM unit with crystal control, that outputs a heady 1W of RF. Crystals are installed for the local repeaters and simplex channels used in the 1980’s, when people actually used 2m before upgrading to a class […]
Has anyone out there ever used a 3B/240M (CV2214) valve / tube in an HF amplifier? I came across one of these, new and boxed, amongst my collection of treasured family heirlooms…it looks like a miniature 5B/254M but isn’t. The 3B/240M or CV2214 is a small grounded grid triode for use up to 200MHz. It […]
Some years ago I acquired some superb…and originally very expensive…SEI Crystal Filters on 1.4MHz. I knew I had a USB and LSB pair, but didn’t know which was which and had no idea about the correct termination impedance. What I needed was SEI Crystal Filter Data…which no one had. There have been lots of questions […]
This post is about getting your RPi Wobbulator working on the new Raspberry Pi 2 computer. It assumes you are already using one on the older Raspberry Pi’s. The Raspberry Pi Wobbulator Kit is available from Cut Price Cables and I can heartily recommend it..although there are quite a few SMD components to install. If […]
There was a time when radio hams and electronic hobbyists seemed to have more time to build things. Maplin used to publish an excellent magazine in those days…for just 85p…that featured projects you could build, along with hints and tips for experimenters. In September 1988, Maplin introduced a really excellent Direct Conversion Receiver which many people […]