This is a simple add-on adapter for any Family Radio Service (FRS), amateur, or two-way radio transceiver with a microphone/Push-to-Talk (PTT) and external earphone/speaker interface. It will turn the transceiver into a co-channel jammer. That is, a jammer which can only jam a single frequency upon the detection of any "activity" on that particular frequency. This type of circuit is also commonly...
Static Bleeder for Any Antenna
by Phil Salas – AD5X
Many antennas don’t have a means of bleeding off static build-up. This includes the popular Hustler BTV-series of verticals, dipoles without transformer-type baluns, and many other antennas. While this is typically not much of a problem, I am always concerned about possibly damaging my antenna analyzer when I first connect it to an antenna....
The ‘Retro-75’ 75/80 Meter AM Transceiver board kit & The ‘Retro-40’ 40 Meter AM Transceiver board kit
This project is a frankly nostalgic look back at our hobby of 50 years ago. It’s now been updated using all modern components.
Board size 3.5” x 5.27”
Tunable Receiver- 50 kHz, selectable, varicap-tuned
4 kHz receiver crystal filter
A digital voice recorder circuit that used for voice recording and stored inside the IC. This circuit can keep the voice recording for approx. 100 years without power supply and repeat recording up to one million times.
- Power supply : 3-6VDC.
- Consumption : 120mA max. @ 6VDC.
- Recording time : 20-60 sec.
- PCB dimensions : 2.86 x 1.64 in.
How to work:
The WBR – A Simple High Performance Regen Receiver for 40M by N1BYT.
Photo by AA7EE
A few weeks ago when a sizable order of parts arrived from Dan’s Small Parts And Kits, the plan was to use them (along with the parts from a few smaller orders from kitsandparts.com and Mouser) as the basis for some fun home-brew projects. I got my feet wet by building some small circuits Manhattan style – an audio...