PE1E wrote:
I was told that the absence of filtering between Tx mixer and Tx
buffer
amp could cause annoying IM products.
( The bandpass filters in the K2 are behind the Tx buffer amp., while
in at
least one of my other tranceivers in use here I see the bandpass filter
straight behind the Tx mixer without interfacing amp. ).
Could this observation contribute adversely to the SSB Tx audio
quality (
in-band IM3) or do I see a ghost ?
Peter,
The TX buffer amp is operating class A, and any IMD it contributes will
be completely negligible compared to the IMD contributed by the
class-AB final amp. So, positioning the bandpass filters after the
buffer should have no impact on observed IMD.
If you see any more ghosts, let me know :)
73,
Wayne
N6KR
---
http://www.elecraft.com
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