Al,
The dynamic balance between the base and emitter of Q12 determine the
AGC Fast/Slow response. The dynamic characteristics of Q12 as well as
R2, C4, RP6 and C1 all come into play.
Remember when doing the analysis that the voltage at /SLOW AGC is at 5
volts for fast AGC. When you consider the dynamic response, C1/RP6 pins
1-2 are important. From a dynamic relationship, that biases the emitter
of Q12 to something near 5 volts and obliterates the effect of the R2/C4
time constant.
73,
Don W3FPR
On 7/15/2016 12:11 AM, Al Lorona wrote:
I'm looking at the K2 schematic at the components on the Control Board that set
the AGC time constant, and I can't understand how the fast setting gets its
time constant... the parts involved, C4 and R2, appear to have a very long
time, much longer than necessary for the FST settting.
If you know what's going on could you contact me off-list to explain it to me?
Thanks.
R,
Al W6LX
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