Hi-Z Antennas HIZ-PC-4A Manuel - Sayfa 4
Anten Hi-Z Antennas HIZ-PC-4A için çevrimiçi göz atın veya pdf Manuel indirin. Hi-Z Antennas HIZ-PC-4A 19 sayfaları.
Sayfayı YazdırThe available stock delay cables calibrated pair at 1.84 MHz which provides for wide-
band performance have Part Number HIZ-DL4-60-85 for the 60-foot side dimension and
HIZ-DL4-80-113 for the 80 feet per side dimension.
The following pages shows the performance at 160 meters, 80 meters, and 40 meters
for this array at 60 and 80 feet per side dimension. Also, other delay values are possible
with a customer adjustment procedure in Appendix C attached to this manual.
From the plots one can conclude that for a given array dimension the performance degrades
as the frequency goes up. This leaves one with decisions to make if the user's preferences of
Front to back ratio or RDF (Relative Directivity Factor) are different than our recommended
array.
The HIZ-PC4 phase controller has a set of internal header pin jumpers that can be moved to
select an 80 foot per side or a 60 foot per side array. Making this selection insures the best
performance for either array size. The HIZ-PC4 is shipped from the factory with these jumpers
set for the 60 foot per side array. See Appendix D for instructions on changing the header pin
jumpers.
See Appendix D for a
Larger picture of the
Jumper selection.
The following next pages of plots should help in optimizing the array to your individual needs
assuming you desire something other than the recommended 60-foot side dimension. One
must keep in mind that at the higher frequencies you receive there can be varying incoming
signal arrival angles. This can greatly affect the observed front to back ratio. In addition, large
metal objects like metal fencing, metal buildings, or other antennas can also affect patterns
and performance.