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 choke balun

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Badgeruk1980
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Badgeruk1980

Call Sign : G0SGR,CT3226,(Badger).
Posts : 56
Times Thanked : -3
Join date : 2019-10-05
QTH or Location : Wiltshire,UK
Equipment Used : Kenwood TS-570DG, Alinco DXSR9, CRT SS6900, UNIDEN UBC355XLT
Age : 40

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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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GaryWilson

Call Sign : 26-CT-1836 Ham 2E0GGQ
Posts : 1955
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Join date : 2019-06-27
QTH or Location : Braunston Northamptonshire.
Equipment Used : Radios & Wires & Stuff!
Age : 56

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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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Call Sign : 26ct2767
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QTH or Location : Swindon
Equipment Used : Yaesu ft818 , yaesu 8900r , yaesu ft950, stalker 9
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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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GaryWilson

Call Sign : 26-CT-1836 Ham 2E0GGQ
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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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Call Sign : M0GVZ / 26CT1760
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Equipment Used : Icom 7300, TS480, President McKinley, Albrecht AE6110, CRT Mike
Age : 50

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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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PostSubject: Re: choke balun   choke balun Icon_minitime

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