Home |
Search |
Today's Posts |
|
#1
|
|||
|
|||
V Beam, do they work?
On Fri, 24 Mar 2006 12:04:51 -0500, Dave wrote:
wrote: SNIPPED It looks like a simple antenna, has a good reputation, but it doesn't look very useful for anything. Unless there is a combination I'm missing. 73 Tom I've never worked with a Vee antenna. But, while stationed at Hill AFB, Utah we used two of them back to back to make a Rhombic :-) to support the South East Asia phone patch nets during the Vietnam conflict. Fixed point to point communication [We had an LP that was used for stateside COMMs] My understanding is that a narrow beam is formed along the axis [centerline] of the Vee. In a standing wave antenna, the beam is bi-directional. In a terminated antenna, traveling wave, the pattern is unidirectional. The narrow beam width reduces interference from undesired directions. Tom is correct. Vee beams and rhombics have horrible sidelobes that make them in my estimation highly overrated. The vee is not completely bi-directional, a couple of dB FB is not uncommon. A vee, just like a rhombic can be terminated to increase the FB. If the legs are long enough it -is- a traveling-wave antenna and is somewhat self-terminating. The claim for broadband gain is also suspect. There are optimum parameters that are not frequency independent Of course I can't fault VK5MC's three-stack rhombic that gave me my two-meter WAC :-) Total wavelength and included angle have significant impact on performance. Of course. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
finally putting copper to the torch for 20, can I make it work for 30 too? | Antenna | |||
can I make this 20 meter antenna work on 30 also? | Antenna | |||
Here it is-BPL full rollout in Va | Policy | |||
small 10 meter beam for satellite RX | Antenna | |||
TA-33 Beam question | Antenna |