I'm suggesting that using a pad to control gain is bad design. A pad is
going to necessary to provide the correct 50 ohm termination for the driver.
I would suggest that the main gain control component on the KPA500 was
T2, although a more detailed analysis may show that some or all of the
passive components between its secondary and the FET gates are involved,
as well.
In any case, I don't think Elecraft are going to comment on how the
achieve FCC compliance, on the 1500, in too much detail, in case it
could be interpreted as instructions for subverting that mechanism. At
least not until they have approval. I notice total silence from the
insiders on this, and the previous similar thread.
--
David Woolley K2 06123
On 13/05/17 15:59, Dr. William J. Schmidt, II wrote:
So are you saying that the KPA500 is a bad design?
I'm not aware of a single non-CB amplifier that doesn't use an input pad...
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