[Amps] Henry 3 KD Premier with 8877

[TexasRF at aol.com]

Going back to the fundamentals: overall efficiency for class AB2 is  
approximately .65 times (Qu - Ql) divided by Qu. Qu is unloaded Q and Ql is  
loaded Q.
 
at 10m the Qu is higher because inductor losses are higher. In addition,  
part of the inductance includes band switch leads and other leads between 
tank  circuit components. These leads are typically smaller causing losses to  
increase. In addition, tune C has a minimum value that adds to the total C 
and  that increases the loaded Q which further increases losses.
 
Gerald K5GW
 
 
 
 
 
In a message dated 5/22/2017 4:14:25 P.M. Central Daylight Time,  
jmiklos at windstream.net writes:

Does  anyone have any first hand experience with this amplifier?  I’m  
particularly interested in the 10 meter performance (Eb, Ib, Pi, Po).   Maximum 
power output at .9A of Ib is only 1200 watts with efficiency at  43%.  The 
lower frequencies are more typical for an 8877, ie, 1500 watts  out with 
efficiency around 64% and Ib at .75A.  Any theories to explain  the low 
efficiency on 10?

73’s
Buzz

Buzz Miklos  WA4GPM
2043 Hawkcrest Drive E
Saint Johns, FL  32259
570-974-7433
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