[Amps] Tuner Loss

[ToddRoberts2001 at aol.com]

In a message dated 3/13/2011 3:39:14 A.M. Eastern Daylight Time,  
km1h at jeremy.mv.com writes:

Losses in your typical commercial tuner are in the inductor as the low C  
used on 80-160 are the problem. This was shown decades ago in ARRL reviews  
of available tuners.On 160 in particular it was shown that a "matched"  
condition was possible with the inductor absorbing the full power.
 
 
Enjoyed reading all the comments on tuner loss. It looks like  whatever we 
do, don't skimp on the inductor.
 The best way to keep tuner loss low is to use the heaviest  inductor 
practical
in a large box with the best roller contact available and pay attention to  
coil 'Q' and have enough 'C'
available on the input and output side to be able to reach a matched  
condition with
the least 'L' using the 'T' network configuration. 
 Probably best to use high-current vacuum variables for the 'C'.
 
Also looks like it would be best to have  separate tuners,  one optimized 
with larger 'L' for the
lower bands 160-80 and another tuner with a smaller value inductor  
optimized for 40-10.
 
73 - Todd WD4NGG