Pringles Can CMC Choke

Chicago Savage · Aug 23, 2019

Actually it's about a half a Pringles can. 8 turns of coax with fish tank hose for spacing. Clear Gorilla tape, with the sticky side out around the can to hold the coax and tubing onto the can, then another layer over the outside to seal the deal. I sell them for $99.99. Free shipping. Just kidding..

sp5it · Aug 23, 2019

Core should be dielectric. Doesn't Pringles have aluminium layer?
Mike

Highway Man · Aug 23, 2019

i was told 4 inches at 5 wraps. right or wrong i don't know.
looks good..now hang some trees off of it lol

543_Dallas · Aug 23, 2019

Highway Man said:
i was told 4 inches at 5 wraps. right or wrong i don't know.
looks good..now hang some trees off of it lol

Close enough.

Highway Man · Aug 23, 2019

if I'm reading the chart correctly, that's 5 turns at 4.25" ?

Highway Man · Aug 23, 2019

that was Lightning fast with the chart post! excellent

The DB · Aug 23, 2019

When it comes to chokes, the diameter of the form, number of turns, and spacing between the wires all make a difference, and the aluminum in the pringles can that Sp5it mentioned would also have an effect. These are also very narrow banded compared to other chokes. I wonder what frequencies this choke actually works on...

The DB

543_Dallas · Aug 23, 2019

Highway Man said:
if I'm reading the chart correctly, that's 5 turns at 4.25" ?

Yep....I have that picture saved on my phone. It's a handy reference.

Chicago Savage · Aug 23, 2019

sp5it said:
Core should be dielectric. Doesn't Pringles have aluminium layer?
Mike

Yeah, it's cardboard with an aluminum film on the inside. I was wondering if that would have an effect. My first one was made with PVC but I felt like it was too heavy. It has to be lightweight. I'll try again. This one's working, though. 1.1 SWR with my 9' whip, reduced noise, no more RF messing with my GPS and subwoofer amp.

543_Dallas · Aug 23, 2019

Chicago Savage said:
This one's working, though. 1.1 SWR with my 9' whip, reduced noise, no more RF messing with my GPS and subwoofer amp.

That's the important part. I like to use a stack of ferrite beads around the coax for a mobile install. Less bulky so it can be hidden by the headliner if you use a puck with ring terminal connectors.

They have to be the right mix of ferrite for the frequency though. That's one of the things it's best to buy new and look at the datasheet.

fourstringburn · Aug 23, 2019

Try a coax choke with 7 coil turns and a 3/4 inch snap on mix 43 ferrite.

Maybe read K0bg website on common mode currents and how to suppress them.

https://k0bg.com/common.html

w9cll · Aug 23, 2019

Really that is going to just hang there? wow

sunbulls · Aug 23, 2019

w9cll said:
Really that is going to just hang there? wow

My wife insists that the headrests are all the way down on the back seats so she can see out the back window better. I somewhat agree with her. If I was to do something like that she’d leave it hanging with an extra turn around my neck for good measure.

Shadetree Mechanic · Aug 23, 2019

w9cll said:
Really that is going to just hang there? wow

Function over form?

743SEPA · Aug 23, 2019

9' on the roof! Holy tree trimmer Batman

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Pringles Can CMC Choke

Chicago Savage

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sp5it

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