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 FT240-43 FAIR-RITE FERRITE CORE TOROID Question???

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4 posters
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smileymiley
New Member
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smileymiley


Call Sign : 26-CT-4526
Posts : 20
Times Thanked : 0
Join date : 2022-05-27
QTH or Location : Rayleigh. Essex
Equipment Used : President Mckinley Export Mod / Thunderpole 5

FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Empty
PostSubject: FT240-43 FAIR-RITE FERRITE CORE TOROID Question???   FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Icon_minitimeFri Jun 03, 2022 8:41 pm

Newbie (s) question really
Is 43 mix the best / right mix for CB 27.000 MHz. Also, does the coax you use to make the choke have to match the coax already used from the antenna or as long as it's 50 ohms it won't make any difference??? 
Lastly....How many turns round the toroid will work best at cutting noise?? Used clip on ferrite rings on most things electrical around me, but need to beef up the battle of ground noise.
Regards and thanks
smileymiley 🙂
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chazwozza
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Posts : 120
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Join date : 2020-02-15
QTH or Location : England
Equipment Used : Radios

FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Empty
PostSubject: Re: FT240-43 FAIR-RITE FERRITE CORE TOROID Question???   FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Icon_minitimeFri Jun 03, 2022 9:08 pm

https://pf9z.com/rf-choke-build-your-own/

Decent chart at the bottom for Rf chokes etc may not answer your question but a handy chart none the less

smileymiley likes this post

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Ivy Mike
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Ivy Mike


Call Sign : 26CT4113/G1HWY
Posts : 437
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Join date : 2021-05-16
QTH or Location : IO90uv
Equipment Used : ICOM radios/antenna farm
Age : 68

FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Empty
PostSubject: Re: FT240-43 FAIR-RITE FERRITE CORE TOROID Question???   FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Icon_minitimeSat Jun 04, 2022 8:17 am

smileymiley wrote:
Newbie (s) question really
Is 43 mix the best / right mix for CB 27.000 MHz. Also, does the coax you use to make the choke have to match the coax already used from the antenna or as long as it's 50 ohms it won't make any difference??? 
Lastly....How many turns round the toroid will work best at cutting noise?? Used clip on ferrite rings on most things electrical around me, but need to beef up the battle of ground noise.
Regards and thanks
smileymiley 🙂

i use RG142, expensive but will handle most powers, put mine in a plastic box with sockets.
They don't need to be in a box but water proof the connectors if outside.
RG58 will do or similar small coax, needs to be 50ohms and 8 to 12 turns should do it.
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smileymiley
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New Member
smileymiley


Call Sign : 26-CT-4526
Posts : 20
Times Thanked : 0
Join date : 2022-05-27
QTH or Location : Rayleigh. Essex
Equipment Used : President Mckinley Export Mod / Thunderpole 5

FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Empty
PostSubject: Re: FT240-43 FAIR-RITE FERRITE CORE TOROID Question???   FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Icon_minitimeSat Jun 04, 2022 8:37 am

Thanks Ivy Mike 👍
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43CT016
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43CT016


Call Sign : 43-CT-016
Posts : 352
Times Thanked : 22
Join date : 2019-11-17
QTH or Location : Perth
Equipment Used : iCom IC-7610/IC-9700/IC-705
Age : 54

FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Empty
PostSubject: Re: FT240-43 FAIR-RITE FERRITE CORE TOROID Question???   FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Icon_minitimeSat Jun 04, 2022 11:39 pm

43mix is good for the upper HF frequencies.  A great guide for chokes is here:

http://karinya.net/g3txq/chokes/

and the table for 43 mix specifically shows 9 turns of RG58 does quite well:

http://karinya.net/g3txq/chokes/type43.jpg

You can better it with 61mix, but you will pay for the privilege:

http://karinya.net/g3txq/chokes/type61.jpg

SangueG likes this post

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smileymiley
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New Member
smileymiley


Call Sign : 26-CT-4526
Posts : 20
Times Thanked : 0
Join date : 2022-05-27
QTH or Location : Rayleigh. Essex
Equipment Used : President Mckinley Export Mod / Thunderpole 5

FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Empty
PostSubject: Re: FT240-43 FAIR-RITE FERRITE CORE TOROID Question???   FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Icon_minitimeSat Jun 04, 2022 11:42 pm

Many thanks for your help.
Regards
smileymiley Very Happy
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FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Empty
PostSubject: Re: FT240-43 FAIR-RITE FERRITE CORE TOROID Question???   FT240-43 FAIR-RITE FERRITE CORE TOROID Question??? Icon_minitime

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