Of course, but that's a conscious choice by Elecraft and it does not
result in the "cleanest, purest signals around." I give Elecraft tons
of credit for the other measures they have take to produce good signals,
which is why I own and will keep my upgraded K3 probably forever, but
K8JHR simply was incorrect in his comment and it makes a difference when
considering the expanding focus by folks like Sherwood and others to
clean up the bands. When it comes to IMD, Elecraft is not one of the
better players. The fact that that's by choice doesn't change
anything. I suspect that 95+% of K3 rigs are used in portable/emergency
situations less than 5% of the time.
73,
Dave AB7E
On 9/13/2020 7:14 PM, Wayne Burdick wrote:
12 volts is a severe constraint for MOSFET PAs. But, like a lot of other
manufacturers, we accept this constraint so the equipment can be used in a wide
variety of portable/emergency power situations. As a result we have IMD numbers
in exactly the same range as other products that are subject to this constraint.
On the other hand, our transceivers are best in class in terms of transmitted
keying bandwidth. See paper by K9YC for example. Perhaps that's what JR was
thinking of.
73,
Wayne
N6KR
On Sep 13, 2020, at 6:50 PM, David Gilbert <[email protected]> wrote:
I don't know where you got the idea that the K-Line produces the cleanest
signals. As several people have pointed out, because of the 12 volt finals the
transmit IMD performance of the existing K-line is relatively poor.
Dave AB7E
On 9/13/2020 2:32 PM, JR wrote:
Why are so many ops obsessed with predistortion?
The Elecraft K-Line already produces some of the cleanest, purest transmit
signals around. Do we need predistortion ? If so, why, and how much better
is it than what we already have? Should I wait to buy a new rig until that is
available?
Thanks and Happy Trails to all. K8JHR
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