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Dear Alan, LF group
Art. 38-2670 Ferrite rod is interesting. The six
slots act as a gutter for the connecting wires. Material is 3A10, permeability
about 350 only usable for receiving purposes.
I used it once for a permeability tuned
inductance in an ATU, but the rod became very hot so satuation field seems to be
rather low.
It behaves excellent for LF
receiving.
Toroids can vary in AL values from 2 to 10,000 or
even more.
The lowest are iron dust cores and can be
used for ATU's and receiver tuning circuits.
As ferrite type toroids have no air gap
permeability is rather temperature dependent, so dont use them in passive
filters.
The high AL value items are intended for RFI
suppression.
For HF baluns only the low AL types are
useable.
General rules for colour coding cannot be
given as each manufacturer has its own system of coding .
AL can be measured for instance by
winding ten turns and then measure the inductance. AL = nanoH per turn
squared.
Best greetings from Harry,
PA0LQ.
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