One
of a range of 6-pin plug-in aerial coils made by LEWCOS. This actual
coil is type SPA20 that covers from 1000 - 1500 metres when used in
conjunction with a 0.00025uF variable capacitor. It could be extended
to 2000 metres with a 0.0005uF capacitor.
Price 6
shillings.
A product
booklet detailing specifications and prices for the whole LEWCOS Standard
6 pin coil range (as well as other LEWCOS documents) can be downloaded
from the Radio literature section.