|
Hi guys
Recently i have found a problem with our 6db 473.575 mhz repeater colinear antenna that is being used as a repeater antenna .From brand new it seemed to work well but over time and especially on windy days it will generate desense on our repeater(see previous posts on fading desense) .We have other VHF/uhf antennas used on other repeaters that exhibit the same problem for 3-5 years where sometimes the weaker signals use to come good and clear and then go bad with chopping and scratching .After a extremely windy day we found that one of the antennas was faulty and wasn't even getting out 5-10kms .After replacing it with a new antenna we have no desense even when windy when the others are just showing signs of desense when windy .So it seems that the antenna develop a bad joint over time with the bending of the whip .I am wondering has anyone tried to make the fiberglass more resistant to wind movement.possibly filling the tube with foam or some other method .One manufacturer here had done the tube in PVC instead of fiberglass
Thank You,
Ian Wells,
Kerinvale Comaudio,
| 
