At the industrial premises where my office is, the company next door was throwing this out:
It's alleged to be a WiFi (2.54GHz) dish.
I'm more interested in finding out how much work is involved in adapting it to the local wireless internet ISP's frequency of 3.5-3.6GHz.
The innards of the item at the dish focus are shown here:
along with some approximate measurements (+/- 1mm).
The last time I dealt with any RF theory was in University (20 years ago) and I've never used it since, so I'm hoping I can get some pointers as to whether it's worth bothering with. The local price for manufactured aerials for this ISP are in the AUD 150-200 range as far as I've found so far.
So, my guesses so far: It seems like the aluminium part is a secondary reflector?
The dipole part is quite close to the theoretical value for 1/2 wavelength at 2.54 GHz (I calculate ~59mm for 1/2 wavelength).
Is it just a matter of trimming the dipole to the equivalent 1/2 wavelength for 3.6GHz (~42mm) ?
The reason I ask is that it looks like there's some sort of balun incorporated by the way both brass shims are actually soldered to the braid, but the center conductor is tied to the 'center' (approx) of the dipole. Am I close?
If so, does that mean the length of the brass 'feeders' that are at right-angles to the dipole is critical too? If so, I presume the fold in the shim should be roughly 1/4 wavelength?
Thanks in advance for any advice offered.