This article shows how to use off-the-shelf parts to improve the performance of a radio scanner in the 800 – 900 MHz band. Furthermore, it shows how to expand radio coverage by using two different receive antennas at the same time. For some reason, my new BCD996XT scanner wasn’t working as expected on the statewide … [Read more…]
The Yaesu FT-8800 and FT-7900 are very popular radios. For some activities, it may be desired to be able to transmit outside of the amateur radio bands. This article will show how to do this modification with minimum effort at home. Driving a transverter, participating in the Military Auxiliary Radio System (MARS) or Civil Air … [Read more…]
If you own a spectrum analyzer with tracking generator or, even better, a good vector network analyzer, measuring the frequency response of a filter is fairly easy. But there is one old approach using a noise source that can turn any oscilloscope with a FFT spectrum view into a useful tool for determining the frequency … [Read more…]