just shows how, have to think in terms of Wavelengths, not feet or meters away...
Because any tall structures, or overhead wires affect MW, we checked the test road that STx used
for phone or electric overhead, and his relative levels (measured outside the near field)
confirmed the dip that your numbers showed
Your spot on with KCBC and the (Sanyo I think they were) VHS recorders used
They were Mono ones, and as sound was recorded right along the edge of the tape, had drop outs
In later years, where more live shows in the late evening, meant we could use DAT on 32 slow speed
As I would sit in my workshop, late at night, and hear the overnight tape screw up, drive round there,
get the tangled tape out of the VHS player, and put a different one in, and then go home
Listeners reported poor coverage in one Village, So I went out and measured levels every 10 degrees
It was the very same day that Ofcom (Or its previous name) came out to check up on our signal
I drove by, and saw them parked at the side of the road, Right Underneath overhead electric wires
I Could not believe it, did they not know, this really messes up any readings.....
(It Increases the level in the direction that the wires run)
I drew a proper polar diagram of the levels, showing the null to one Village, which was caused by
pylons on the industrial estate, re radiating from the wires, and cancelling in one direction
I also did some tests on Wavedrag, quite pronounced if use floating battery powered kit
On this KCBC tribute site, if scroll down, can see rack with the 2x VHS recorders above the Optimod
https://1584kcbc.co.uk/?page_id=114
Rod Watts (Radio Rod)
