As I recall Rowland, any old toroid is suitable. I think we used ones
sourced from Maplin or Tandy and they appear to work fine.
Being a non-technical type I haven't got an idea if the exact specification
was critical.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Rowland Carson
Sent: 20 September 2013 09:34
Subject: Europa-List: toroids for vhf comms aerial cable
--> <rowlandcarson@gmail.com>
Annex C of my manual calls out 4-off toroids to fit on the RG-58 coax cable
adjacent to the dipole tapes. The part number given is Philips 4330 030
34420, but this now appears to be made of unobtainium.
Does anyone know of an equivalent ferric toroid currently available?
RS list hundreds; obviously it needs to have a central hole of a suitable
size for RG-58 (or probably RG-400 in my case) to pass through, but what
about the other dimensions, and the magnetic characteristics? It's not clear
whether the toroids are fitted to act as a filter, as tuning, or as a balun.
If, as I suspect, the latter, the magnetic characteristics are likely to be
more critical.
in friendship
Rowland
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