Home |
Search |
Today's Posts |
#26
|
|||
|
|||
A Top Band 1/4 wave vertical?
In message , Edwin Johnson
writes On 2015-04-23, Oregonian Haruspex wrote: On 2015-04-18 08:38:31 +0000, gareth said: How about a tethered helium balloon instead? This way you don't have to worry about powering the thing. Bell wire will handle 100 watts all day without turning into smoke. This sounds like a neat experiment, which one of our members tried on field day. There are several problems in the electrical side of things, but more importantly on the physical side. As you rise in altitude the wind speed will increase, generally speaking, and perhaps change directions. If the day is completely calm especialy above the tree line, say 100-200ft, then the balloon will remain straight up. But launching a balloon in a 10mph wind, which becomes 15-20mph above the tree line, leads to interesting developments with the tether wire/cord definitely sloping and perhaps being pushed into surrounding objects such as trees, power lines (eh gads!) which can cause it to break or other things. So you need plenty of space with few impediments for the balloon to catch on as it ascends. You certainly can't predict a perfectly calm day, so this can be an unpredictable venture. ha See http://www.allsopp.co.uk/ etc. -- Ian |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Which is better: 5/8 wave vertical or J pole? | Antenna | |||
20m 1/4 wave portable vertical | Antenna | |||
New program - 1/2-wave vertical | Antenna | |||
5/8 wave 6m vertical | Antenna | |||
1/4 wave vertical vs. loaded vertical | Antenna |