indoor4.art

一个很小和天线计算程序

SUBJECT:  Wire beams, indoor antennas

       For many of us, the antenna is the biggest problem for most hams.
Hams have to contend with neighbors and the XYL in order to pursue their
hobby.  An interesting HF and VHF idea I've seen used is the wire beam.

       The wire beam is unrolled and suspended in the direction required for
operation.  After the operation is complete, the wire beam is rolled up and
stored for the next time.  This type of beam is excellent for 10m and up to
1.25 m.  You may be able to set up a wire beam for frequencies below 10m
if you have the space to do so.  This antenna is also excellent for 
suspension in an attic.

       A simple model is shown below:


                   R             DE         D

    -----------||--|-------------|----------|--||-----------
               ||  |             |          |  ||  
               ||  |             |          |  ||   
               ||  |             |          |  ||      
    -----------||--|-------------|----------|--||-----------
               ||  |             |          |  ||      
               ||  |             |          |  ||    
               ||  |             |          |  ||  
    -----------||--|-------------|----------|--||-----------


       Aside from the elements, the rest of the configuration is non-
conductive.  Wooden dowel supports are outside the ends of the antenna
and string/rope can be used to support the elements.  The wooden dowels
are not required if suspension is taught.

       You can see that variations of this set-up can be incorporated
to accommodate most any frequency from 10 to 1.25 meters.

-WS