[Elecraft] Buryflex all the way to K3?

[Tom W8JI]

Hi Jim,

I gotta get back to work but......

>>More likely you changed the impedance presented to the 
>>tank
>>circuit on the second harmonic.
>
> The coax I was changing was between the K3 and the amp.

When we measure a change in a complex soup of interactions 
and fields formed by the interactions, we might never really 
know what we really changed or how we changed it. There 
could be a half dozen things going on, including that the 
actual harmonic never really changed in level at all.

Collins fell into this trap with the unneutralized 30L1. The 
30L1 amp, because it lacks neutralization, has inherent 
instability and regeneration problems. They  started playing 
with coax between the amp and exciter, saw changes, and came 
up with a long fairy tale about 180 degree phase inversions 
in the coax between the exciter to amplifier coax. 
Unfortunately the conclusion they reached can be fully 
disproven in a matter of just minutes by observing the same 
things they did in a different way.

Anyone thinking the coax shield has such a large effect 
needs only directly measure egress or ingress through the 
shield to see how little worry about the shield at HF is 
actually warranted. We are in a thick soup of radiation from 
our antennas, and even the worse cable shields "leak" far 
less than the fields from direct radiation. Far more 
important are common mode currents from poor antenna design, 
poor cabinet bonding, poorly thought out groundplanes, bad 
PC or wiring layouts, and poor connector mounting. Coax 
shields are way down the "problem" list at HF.

73 Tom