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Call Sign : 26-CT-1836 Ham 2E0GGQ Posts : 1939 Times Thanked : 149 Join date : 2019-06-27 QTH or Location : Braunston Northamptonshire. Equipment Used : Radios & Wires & Stuff! Age : 56
Subject: Re: choke balun Mon 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.
Call Sign : 26-CT-1836 Ham 2E0GGQ Posts : 1939 Times Thanked : 149 Join date : 2019-06-27 QTH or Location : Braunston Northamptonshire. Equipment Used : Radios & Wires & Stuff! Age : 56
Subject: Re: choke balun Tue 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.
Call Sign : M0GVZ / 26CT1760 Posts : 320 Times Thanked : 23 Join date : 2019-11-13 QTH or Location : IO94SA Equipment Used : Icom 7300, TS480, President McKinley, Albrecht AE6110, CRT Mike Age : 50
Subject: Re: choke balun Wed 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.
Today at 8:18 pm by 
Subject: choke balun 
