The thought of going to 24 GHz was far from my mind back in the summer of 2002. We had just come back from the Central States VHF convention in Madison Wisconsin where I had done a bit of chatting about it, but nothing serious. With Jenna just being born, I was pretty busy with family stuff. I recall a few guys giving me a hard time about it, and
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me saying "not for a few years yet". As the winter bore down, things were pretty well getting on line with raising the kids and I did manage to find again some spare time. I recall giving Donn, WA2VOI a call on the phone about 24 GHz and the ins and outs of it. Having no idea what or where to start, Donn gave me lots of good ideas and told me about where he and Bob - WG AUS, were at with their 24 GHz project. That kind of got me fired up and I began to do a lot of research on the Web as well as do some talking with Gerry at SSB Electronics. Gerry also put me in touch with Walt, WA1HHN. Walt had built a few 24 GHz stations for their contest group and I began emailing with him back and forth. Walt had lots of info and was happy to share it. I also got in touch with Paul Drexler, W2PED. Paul was resource for 24 GHz power amplifiers I was told. Amplifier projects were being done over there for the Pack Rats and Microwave Update members, and Paul was involved with that effort. Here is a link to that story. I first started out by spending a month looking for WR-42 waveguide pieces and parts. Not a whole lot to be found on ebay. But there were a few waveguide manufacturers that had lots of good info on WR-42. I gave a call out to Penn Engineering in California and spoke with one of their waveguide salesmen. I indicated that I was a "Ham" and was considering getting on 24 GHz. So after we chatted a bit, it was decided that he would...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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