Re: VHF filter, Aerial Facilities Ltd
They were typically used at shared antenna mast sites to protect receivers against overload from the transmitters on the same mast. Yes it's a helical filter, just what you need if you have a Kilowatt of pager transmitters blasting away a couple of Megahertz from your receive frequency.
Aligning them can be tricky, everything seems to affect everything else!!
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