The CHA WINDOM 40 antenna is designed for 40m, 20m & 10m. A tuner may be needed to tune the other bands between 80M and 6M. Power handling is 250W SSB. Built with the portable user in mind. Very light weight. Does not require an antenna tuner under normal circumstances. SWR is < 2:0 (Typically a 1:3 to 1:6 ) at about 35′ to 45′. The antenna SWR is influenced by the balun elevation, wires angle, feed-line length and structures proximity.
The following SWR chart shows the SWR curves of the CHA WINDOM 40 elevated at about 10′ of elevation and installed in an inverted “V” configuration. A RigExpert AA-520 and a 50′ long RG-8X coax cable were used. The SWR will be influenced by the antenna elevation, the angle between the two legs and by the coax length and type.
Antenna total length is 66′. Antenna wire elements are #16 proprietary stranded wire (short side is 22′ (6.7m) long and longer side is 44′ (13.4m) long). Built with a 5:1 250W SSB balun mounted on a polycarbonate plate. A 10’ of paracord 550 has been added at each ends of the antenna and another 20’ to secure the balun.
Frequency: 6M – 40M
Power: 100W CW or 250W SSB
RF Connection: SO-239
The antenna system consists of:
1 X CHA WINDOM 40
1 X ANTENNA PORTABLE POUCH
“Dear WSJT-X Beta-Test Colleagues, Steve (K9AN) and I have developed a potential new mode for WSJT-X. We’re calling the mode “FT8” (Franke-Taylor design, 8-FSK modulation). FT8 is designed for situations like multi-... Read more
Glenn Fowler, N5TDJ, of Allen, Texas, reported via Facebook that Amateur Radio served him well on August 4. “We were on a treacherous Jeep trip up at... Read more
The IC-M423G is an enhanced version of the IC-M423 fixed mount VHF/DSC with some new enhancements including an integrated GPS Receiver which allows cu... Read more
The SSB version of ARRL Rookie Roundup is back on Sunday, April 19. The event gets under way at 1800 UTC and continues through 2359 UTC. For th... Read more
Dozens of official “award stations” have registered to take part in the 2017 International Marconi Day (IMD) event, this year being held on April 22,... Read more