Topband: EZnec - 4nec2 - MODELING THE 1/4 SLOPERS.

2014-03-08 Thread K4LCD
Good morning! Has anyone modeled the 1/4 slopers? Perhaps the Alpha Delta DXA? 73 -- Juan A. Granados /K4LCD - WF2XXQ https://sites.google.com/site/k4lcdars/ https://sites.google.com/site/thesdrinstitute/ https://groups.yahoo.com/neo/groups/sdr-users/info Skype: juangranados-miami

Re: Topband: EZnec - 4nec2 - MODELING THE 1/4 SLOPERS.

2014-03-08 Thread Tom W8JI
Has anyone modeled the 1/4 slopers? Perhaps the Alpha Delta DXA? The pattern and performance of a 1/4 wave sloper is extremely dependent on the tower and what is on the tower, the guy lines (if uninsulated), and even how the tower is grounded. There are very common cases where it won't

Re: Topband: EZnec - 4nec2 - MODELING THE 1/4 SLOPERS.

2014-03-08 Thread Herb Schoenbohm
IMHO a wire 1/4 wave length long wire should preferably be electrically connected to the tower and fed from the bottom of the slope against a good ground system. AM stations that have done this in emergencies report good results.In fact some consulting engineers were so impressed after

Re: Topband: EZnec - 4nec2 - MODELING THE 1/4 SLOPERS.

2014-03-08 Thread Jim Brown
On 3/8/2014 9:08 AM, Herb Schoenbohm wrote: IMHO a wire 1/4 wave length long wire should preferably be electrically connected to the tower and fed from the bottom of the slope against a good ground system. Herb, That depends on the height of the tower. I have two sloping wires on opposite

Re: Topband: EZnec - 4nec2 - MODELING THE 1/4 SLOPERS.

2014-03-08 Thread Herb Schoenbohm
Jim.You hit on a good point with a 1/4 sloper that it should be some distance, in your case 5 feet, from the tower at the top or high voltage end. Having the top right at the tower seems to deteriorate the performance overall as many who have tried this seem to underscore. What you have

Re: Topband: EZnec - 4nec2 - MODELING THE 1/4 SLOPERS.

2014-03-08 Thread Tom W8JI
Jim.You hit on a good point with a 1/4 sloper that it should be some distance, in your case 5 feet, from the tower at the top or high voltage end. Having the top right at the tower seems to deteriorate the performance overall as many who have tried this seem to underscore. What you have