Marek Peca schrieb:
This was almost the only reason for ferrite rod -- simplicity and
attenuation of TVs, some LCDs, 50Hz etc.
If you make the antenna about 10x bigger you can omit the whole ferrite.
The only benefit of a ferrite loaded coil is the size of it!
In ancient time radios had flat air coils like spider webs. In fact they
are named after spiders in german.
This air coil can be resonated too!
I can imagine a resonated vertical antenna. Never seen that but all it
requires is a low impedance pre-amp stage and a loading coil of very high Q.
- Henry
--
ehydra.dyndns.info
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