NEVER put your loading coil in a metal box, it totally destroys the
efficiency. Consider it as part of the antenna from the radiation point of
view. You have never seen a loading coil on a Mobile encased in a metal
CAN,
the coil contributes to the over all efficiency ie coil plus whip.
I have seen reference to encasing the loading coil here on this reflector
that is why those signals are poor.
My coil sits outside exposed to the elements and does not seem to be
effected by changing wx, neither does the amps vary whether it be dry or
wet. Recent info on here suggests heating the loading coil to increase the
amps consumed, if this is the case the coil wire, insulation etc is very
suspect.
I change my antenna wire and rewind a new coil at least once a year. I
also
check the insulated radials and change if necessary.
Try a turkey next Xmas without the FOIL, Foil is nether good for antenna
coils or Turkeys
73 de Mal/G3KEV
The loading coil complex used by the Decca stations were located in a small
concrete building. In the early days I understand that there were problems
until the whole building was lined with copper - in other words a screened
box.
This screened box was also electrically heated.
It is obvious that these Decca design engineers didn't know what they were
talking about.
Regards,
Peter, G3LDO
e-mail <[email protected]>
Web <http://web.ukonline.co.uk/g3ldo>
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