[Amps] 10 KW CCS ON 6M...USING THE 3CX-6000A7... PART 12

[Jim Brown]

On 11/24/2022 2:35 PM, Steve Thompson wrote:
> For sure the stub (looking like a short to even harmonics) works best 
> when combined with some series inductance to work against. Hopefully the 
> load cap is already a low impedance to harmonics so the short circuit of 
> stub won't do so much when added across it - but it shouldn't do any 
> harm either, and appeals to my laziness compared with having to 
> manufacture a nice choke like you did.

Take a look at the fundamental concepts in these two links, which 
address the placement of stubs for harmonic suppression at HF. The first 
doc ran in National Contest Journal about five years ago, correcting 
some less than ideal work published a year earlier, the second is the 
slide deck for a talk I did at Visalia around the same time. My work got 
pretty thoroughly peer reviewed.

http://k9yc.com/LocatingStubs.pdf
http://k9yc.com/StubPlacement.pdf

Some of the same techniques are used with cavity filter networks.

73, Jim K9YC