I have been discovering the capabilities of the Radio Mobile software, by Roger - VE2DBE. This is one heck of a wonderful program, and it is free! This software is a tool used to predict the performance of a radio system. If you deal with VHF/UHF/microwave propagation, or if you would just like to know what your station range is, this is definitely a program you want to try. This is actually a professional package that got turned into freeware by the author. The maps are public domain and they get automatically downloaded from the web when you specify the coordinates you want to cover.
OK, I have to confess, I tend to go overboard when it comes to telecom electronics. But I seldom buy new. So I don't spend a fortune. Since my young age, the telephone has always fascinated me. Of course, having several phones in the house is useful. I am sure that most of you have that. But how about having a Private Branch Exchange (PBX) in the house? Sounds overkill? Maybe for most, but read through; I will try to sell my point.
You must have already bought a radio or test equipment that had a display window with scratches. Or maybe you have scratched it yourself? Well, be aware that there is a simple solution to removing scratches off the surface of clear hard plastic. Light scratch marks will disappear and deeper ones will be much reduced.
I attend at least half a dozen hamfests (ham radio fleamarkets) every year either as a buyer or as vendor. It has been more than 25 years of fun and I still love it. I get all excited and can "smell RF" when approaching the site (I told you I become frenzy!). Here are some tips that will help you get the maximum out of these fleamarkets:
You and I know that nothing is perfect in this world and the world of electronic instrumentation is no exception! It is therefore important to ensure that our measuring instruments are as accurate as possible.
One of the most likely test instrument to deviate over time is the frequency counter. The reason is that it uses the precision of an internal reference, an oscillator crystal usually running at 10,000 MHz (to verify this, look for a "10.0000" on a crystal or on a small metal box inside the counter). However, this oscillator "ages" over time, and thus changes in resonant frequency. Fortunately in most cases, this oscillator is adjustable. There is usually a "small screw" adjustment (a variable capacitor) on or near the oscillator. But where to get a reliable 10MHz reference oscillator to adjust the counter? Yes, fans of shortwave radio, the WWV station! This atomic clock at NIST (USA) transmits its signal on a carrier frequency of exactly 10.0000000 MHz.
I would like to share with you the fun I have every month during the North American QRP CW Club sprint contest. Two hours of pure pleasure pounding a straight key with only 5 Watts of RF power into a 40 meter half-sloper antenna. I have so much fun that I take it seriously,
I use rechargeable lead-acid batteries for many applications: Portable radio operation, on camping trips and during power outages. The one on my camping trailer is a 70-Amp Deep-Cycle battery. I have had the same battery for six years and still have not seen any deterioration in performance. This is a pretty good life for a battery that I only use from June to August, and that I put back in storage for the rest of the year.
It is inevitable, the question always comes back: How to seal coaxial connectors and couplingsexposed to the elements? Everyone use their own technique with more or less success, it must be said ...
Of course, there is this malleable and sticky tape called "CoaxSeal". This product works very well, and I recommend it. The problem is that it is difficult to find and rather expensive, and I never have it handy when I need it.
I have perfected my own technique over the years. It uses two readily available products: