I still haven't invested in one of those portable units. i love my Delta Electronics OIB-2, that can measure the Z while 1 kW is transmitted to the antenna. Also, an Hp8751A network analyzer that I g
Isn't it a bit difficult to haul all that up to the top of a tower to make measurements? Measuring at the shack end of coax is NOT measuring the antenna. Don N8DE ____________________________________
Accurate measurement of the antenna from the shack depends on the instrument. With a VNA (Vector Network Analyzer) and the short, open, termination procedure it calibrates out the cable and refers th
Exactly Bob. But I wouldn't want to be the one who has to run up the tower for short, back down to press 'SHORT DONE' and back up for open, down to press 'OPEN DONE'....you get the idea! I remember (
When I install antennas, I perform this calibration for the coax on the ground and store the cal file on my laptop. It is not necessary to recalibrate every time you measure. Rick N6RK ______________
Rick I wasn't serious, tongue and cheek humor about calibrating a VNA for tower top measuring. Do you use phase stable coax, as you lay it down, roll it up or haul it up a tower, doesn't that shift a
This works at HF. Probably not too accurate at UHF. Rick N6RK _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesti
Well, I have a small advantage: My tower folds over, plus I used a temporary remote control coax switch to choose between 'short' and 'open'. I created a group of cal tables for all bands of interest