[AMPS] Inductors

[Peter Chadwick]

Steve said:

>Does a variometer do any better andwork at high power?

Variometers were used a lot in 500kHz marine tx's. The big problem with them is
at minimum inductance, where Lt = L1 - L2 - 2M, but R is the same. The Q gets a
bit abysmal if you want a wide range.

A number of WW2 German military tx's used variometers, some with dust iron
cores, very successfully.

I have some pictures of an variable L form an 80kW rig. That needed  a fairly
complex forced air cooling system - which should make Rich chortle!

73

Peter G3RZP




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