Could someone explain how do you know if you need a choke "what does it eliminate" and where do you place the choke. Thanks!
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Choke?
- Thread starter hammer0630
- Start date
If your engine has a hard time starting on a cold day.
It "eliminates" power loss due to cold operating temps.
And you place it on the carburetor.
Joking aside, read this
http://www.hamuniverse.com/balun.html
It "eliminates" power loss due to cold operating temps.
And you place it on the carburetor.
Joking aside, read this
http://www.hamuniverse.com/balun.html
:laugh: Reminds me of "Airplane", and "We've got to get him to a hospital". "Hospital, what is it"? Answer: It's a large building that holds patients, but that's not important right now.
Great link though... ugly baluns rule!
73,
I am serious, and don't call me Shirley
RT307
It seems like installing a choke is nothing but good, but always it seems everything that is good has a draw back some where. What are the possible draw backs you may encounter?
0630, IMO your comments and question is well to consider. I can't speak from a technical point of view regarding coaxial chokes, but I have had mixed results experimenting with these type of chokes. This subject is something that needs serious study and experimentation for each installation.
The experts here will likely think or suggest that I just didn't know what I was doing, and be done with it. But, you hit the nail right on the head with your question.
IMO there is a lot more to consider using a coaxial choke than just saying...it can't hurt anything whether you need a choke or not. But I think this is how most operators look at this issue and consider a choke as a cure all solution, similar to what 2RT307 suggested above.
Good luck in your quest to find out what you seek here.
hammer0630,
One draw-back that I can see is that a choke results in an additional length of feed line. It may not be much, but it's some.
As Marconi mentioned, probably the biggest mistake made with chokes is thinking that they are a 'cure' for almost anything dealing with RFI. They aren't.
- 'Doc
One draw-back that I can see is that a choke results in an additional length of feed line. It may not be much, but it's some.
As Marconi mentioned, probably the biggest mistake made with chokes is thinking that they are a 'cure' for almost anything dealing with RFI. They aren't.
- 'Doc
that's the second biggest mistake with chokes,
the biggest mistake is reading that ham universe link and believing it will cover 160 - 10 metres which is bollocks, chokes give their best choking impedance over relatively narrow bandwidths, therefore the one shown on ham universe is most probably useless at cb frequencies, 4 or 5 turns on a 4.5 to 5.5 inch former will give best results at 27mhz with rg213/u (M17/74) / rg58 (M7/38)
a good read at Steve G3TXQ'S choke webpage will give you a far better understanding of how/where they work than that ham universe link will:
Common-mode chokes
the ham universe link does give some good construction techniques though.
A friend put up a 80' tower with an Imax 2000 9913 coax could not get a good match.Had the local CB shop teck come over with the antenna anaylizer he looked at us and said Quote ( " you need another 67 ft of coax, we can lay it on the ground under the tower") they tried several legnths and it got a little better...
When he left I said get a small piece of PVC pipe and wrap an ugly balun or choke it will stop your feed line or coax from acting as an antenna, He lowered the tower put it at the base of the antenna and all his stray RF interference was gone and the match was almost flat on 10 and 11 meters.
When he left I said get a small piece of PVC pipe and wrap an ugly balun or choke it will stop your feed line or coax from acting as an antenna, He lowered the tower put it at the base of the antenna and all his stray RF interference was gone and the match was almost flat on 10 and 11 meters.