![]() ![]() However, I chose not to do so as a way to give back to this wonderful hobby community, which indirectly has given me a lot. I briefly considered patenting my design. The Center-Loaded Off-Center-Fed Dipole (CL-OCFD) was invented and first described by yours truly, Serge Y. ![]() This design exercise resulted in a new kind of antenna which I dubbed Center-Loaded Off-Center-Fed Dipole Antenna, or CL-OCFD for short. At the same time, my preference went out to the low- and the non- WARC bands. Thus I set out to design an HF antenna with a VSWR of 3÷1, or less, over the full bandwidth of as many amateur radio HF bands as possible. Anyhow, I can tune out VSWRs as high as 3÷1 with the adjustable pi-network of the output filter tank inside my power amplifier. I never chose to spend any money on a kW-rated antenna-tuner. Post your questions, results and pictures to: the OCFD Design goals output tank of a PA Like many fellow radio amateurs, I own a fairly standard shortwave radio station consisting of a 100 W HF transceiver driving a 1 kW tube power amplifier. Wanting to discuss OCFDs and single-wire-fed Windom antennas? If there was a disaster where repeaters went offline, I suspect a lot of people with UHF/VHF ham gear won't be in much better shape compared to kids with FRS radios.Having any questions about the CL-OCFD antenna? Take the time to know, from your home, how far you can be heard. What I'm learning is simplex QSOs at low power are usually only 5-10 miles away.ĭriving up a modest hill can really extend that distance. In an effort to better learn the RF landscape, I've started monitoring calling frequencies, and occasionally calling for myself. ![]() 1800 foot mountain peaks go a long way (literally). The point being, I got spoiled working repeaters 30 miles from me using 10 watts. ![]() I'm sure using a higher roof mounted antenna would do better. I was testing from my car with a small antenna. Of those ten 2 meter stations <= 20 miles from my grid square, I could only reach two reliably. With a 50 watt mobile, reasonable antenna and a street elevation of 600 feet - what more could I want? There were plenty of stations < 20 miles from me. I was recently reminded of this when testing our packet winlink email on VHF. The downside of rugged, high elevation terrain is the station you intend to reach is not always in line of sight as repeaters often are. So a modest handheld or mobile station can seem perhaps better than it is. Near my QTH we have very high elevation repeaters. ![]()
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