Its a question of requirements.
1. These Decca coils were used only on TX and 10/15 db loss was acceptable
by putting these coils in a metal cage for environmental reasons.
2. Heated coils generate noise, in fact the coils should be kept cold, but
again in a TX only mode it does not matter.
Because the LF radio amateur also requires the antenna and associated coils
for receiving , heating the coils produces unnecessary noise and on Transmit
one cannot afford 10/15 db loss of radiated power.
For those using RF preamps try running them in a cold environment, in a cold
box at 0C and get a superior signal over noise at the RX front end.
The above info is old hat for those in the know, it would appear some have
led sheltered lives in the wireless world.
G3KEV
