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WA7KGX Ham Radio Blog HP 3586B Selective Level Meter In days past, long distance phone circuits were bundled together with frequency division multiplexing (FDM). Frequency selective voltmeters were used to monitor and troubleshoot these systems. Now that analog FDM systems have joined NTSC TV in the...

I've been interested in AM broadcasting since early grade school. The E. F. Johnson Viking series of CW/AM transmitters has been a favorite of "AM'ers" for years. When a Viking Ranger appeared in the local Craigslist offered for a swap of stereo gear, I traded a preamp and turntable I hadn't used fo...

Unofficial QRS CW operating frequencies. Here is a list of the unofficial QRS CW operating frequencies. These frequencies are only a guideline as a place for the group to meet and are not part of any band plan. If you hear a slow speed CQ out there then answer the call and enjoy a relaxed QSO at a s...

Interfacing a Racal-Dana 1992 Counter Below: Data output over the GPIB bus. "FA" indicates Frequency measurement of the A input. FA+0065.7789065E+06 FA+0065.5935508E+06 FA+0065.7788307E+06 This counter came with a GPIB interface. Initially it was configured to use an Air Force interface protocol, bu...