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 choke balun

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Badgeruk1980
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Badgeruk1980

Call Sign : G0SGR,CT3226,(Badger).
Posts : 56
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PostSubject: choke balun   choke balun Icon_minitimeSun Oct 20, 2019 9:29 pm

Has anyone used or using a 1:1 choke balun? Do you have much luck?
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GaryWilson
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PostSubject: Re: choke balun   choke balun Icon_minitimeMon Oct 21, 2019 11:30 am

They should always be used when using an unbalanced feeder i.e coax to connect to a balanced antenna like a dipole. If you are getting RF in the shack ferrite chokes can work well too.

73's Gary.
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Matt86
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PostSubject: Re: choke balun   choke balun Icon_minitimeMon Dec 02, 2019 12:03 pm

Garry also on your power supply helps . Have you seen the rsgb video on cleaning up your shack ?

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GaryWilson
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choke balun Empty
PostSubject: Re: choke balun   choke balun Icon_minitimeTue Dec 03, 2019 7:44 am

Matt86 wrote:
Garry also on your power supply helps . Have you seen the rsgb video on cleaning up your shack ?

Hi Matt,

I haven't seen that particular video, but yes you are correct, good radio housekeeping is a must. EMC is a big subject and anyone setting up a new shack be it C.B. or Amateur stations would do well to ensure that they have all of the possibilities covered.

73's Gary.
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Northern Crusader
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PostSubject: Re: choke balun   choke balun Icon_minitimeWed Dec 04, 2019 2:18 pm

I always use a RF choke on every antenna. Once tried my Imax 2000 without it and got all kinds of issues you'd expect from common mode RFI.

Most of the time it's nothing more complicated than 8 turns of coax round a FT240-31 / 43 toroid.

If you don't want to use a toroid then for air wound you need 5 turns of RG58/213 on a 4.25" diameter centre - 110mm diameter waste pipe from MKM is ideal for making them.

choke balun Choke_impedances
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