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@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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