transmit distortion products are within a few 10s of
kHz of your transmit frequency.
We are not
talking about harmonics.
attached two small 100K pictures, if they make it
through the reflector.
The span of
the spectrum analyzer is 40 kHz, + 20 kHz and – 20 kHz
of the transmit frequency.
If they don’t
come through, e-mail me direct, rob@....
One is of a
Collins 32S-3 and the other a K3.
This is what
Knut is talking about.
is typical of a solid-state PA vs. a pair of 6146A
tubes with negative feedback.
solid-state rig today would look about the same.
I hate to reveal my ignorance, but isn't that one
of the reasons I have a low pass filter in-line to
my antenna system?
I would welcome a brief explanation if the low
pass filter is not effective.
Also, forgive me for posting a reply before I have
read the entire list. I jumped the gun awhile
On 4/10/2016 4:43 PM, ab2tc@...
Hi Rob again,
Yes, the higher order products are the worst
problem with most solid state transmitters. In
tube transmitters there is the 3rd order and
very little after that. In most solid state
transmitters the spectrum goes on and on and
on... This requires attention by mainstream
companies, including Elecraft. I'd really like
to see Elecraft take the lead with respect to
SSB transmitter distortion. If there is ever a
K4 it ought to have a clean transmitter. I
don't really care about the receiver. If a
direct sampling receiver saves them money and
retains or improves the performance, kudos to
AB2TC - Knut