Re: Topband: Looking to improve TX antenna Efficiency

2012-11-20 Thread Rick Karlquist
Steven Raas wrote: > Main Element: 32 feet vertical - 90 deg bend ( the 'L' ) which runs > 43' horzontally pointing north. Then, another 90 deg bend, and > ascending 26' in length ( from 30' up to about 11' above ground > running from west to east. ), then..you guessed it.. another 90 deg > bend t

Re: Topband: Looking to improve TX antenna Efficiency

2012-11-20 Thread Guy Olinger K2AV
We need to put gorilla detectors in SWR meters. Loss in the ground counterpole will be the thousand pound gorilla in the room. Heavily bent antennas as you describe lower the radiation resistance significantly, which makes the resistance of the counterpole even more critical than for a pure 125 f

Re: Topband: Looking to improve TX antenna Efficiency

2012-11-20 Thread Joe
Steve, I have an inverted L with 32 feet vertical and then 96 feet horizontal leg. The horizontal leg runs southeast and slopes from 32 down to 10 feet at the last 15 feet of its run. The antenna is resonant with SWR of 1.3 at 1.810. It is fed directly with 50 ohm coax. No chokes, coils or tu