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 27.255MHz?

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Uncle P
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Uncle P


Call Sign : 26-CT-4640
Posts : 27
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Join date : 2022-03-11
QTH or Location : Prescot, Merseyside
Equipment Used : Little boxes wi' knobs on and big metal stick thingy
Age : 57

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PostSubject: 27.255MHz?    27.255MHz?  Icon_minitimeFri Sep 23, 2022 5:21 pm

I was sat there clicking through the EU40 last night when something jumped out at me from my display....
channel 21 - 27.215
channel 22 - 27.225
channel 23 - 27.255
channel 24 - 27.235
channel 25 - 27.245 
channe...... Whaa!!! Shocked  channel 23 - 27.255 Surprised


Well I started thinking something must be wrong with rig. It can't be correct....can it? Out with the user manual, back pages - Frequency Table for EU. Oh thank god for that. Its how it should be. Why as 255 leapfrogged 245 and 235. BUT WHY?????

It must be a Europe thing like straight bananas.
Please enlighten me someone. I'm curious scratch

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SangueG
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SangueG


Call Sign : 26-CT-3971 / M7TDV
Posts : 733
Times Thanked : 40
Join date : 2021-01-30
QTH or Location : Cirencester, Gloucestershire
Equipment Used : Little radios, home-made antennas

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PostSubject: Re: 27.255MHz?    27.255MHz?  Icon_minitimeFri Sep 23, 2022 9:24 pm

Hey Uncle P, nope not a Euro thing. Definitely a US thing. Stems back to their original 23 channel rigs with the frequencies assigned to them at the time. Other services used 27.235 and 245 and above 27.3. When those frequencies came available they kept the original channel layout and gave the first couple of new channels those back filled frequencies.

Hope that makes sense Smile

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Uncle P
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Uncle P


Call Sign : 26-CT-4640
Posts : 27
Times Thanked : 0
Join date : 2022-03-11
QTH or Location : Prescot, Merseyside
Equipment Used : Little boxes wi' knobs on and big metal stick thingy
Age : 57

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PostSubject: Re: 27.255MHz?    27.255MHz?  Icon_minitimeSat Sep 24, 2022 2:28 am

That makes perfect sense Neal. Thanks for clearing that up for me my friend Very Happy

You have a great weekend

73's

Paul

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Victor
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Call Sign : 26-CT-3228 Ham M7VIC
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Equipment Used : Various

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PostSubject: Re: 27.255MHz?    27.255MHz?  Icon_minitimeSat Sep 24, 2022 6:24 am

Well answered by Neal there. 27.255MHz?  1f44d 


You'll also notice the other historical gaps on the same band too such as between channels 3 and 4, 7 & 8, 11 & 12, also 15 & 16 as well as 19 & 20.

They were originally designated for radio control and over time were known as the 'Alpha' channels with CB'ers utilising them for their own use. (Some called them the 'secret' or 'hidden' channels but they were never intended for CB use.) They're spaced apart more than CB channels due to the simpler and therefore lighter radio receivers used for radio control avoiding the 455kHz IF or intermediate frequency so they didn't interfere with each other.

Imagine spending tens or hundreds of hours patiently and lovingly hand building an RC aircraft only to see it suddenly as well as unexpectedly fall from the sky whilst flying it so crashing to pieces as it hits the ground!! Not helped as a car rolls past with a massive antenna atop it and a CB 'breaker' screaming out "10-4 good buddy".  Shocked

However, much like how people could've caught more fish with a 'better rod', driven faster if the tyres weren't worn or beat that high score with a 'better joystick', lack of aerodynamic or radio knowledge could easily be blamed on someone else. Wink


It's stuck in history now as you would've otherwise rendered original CB's obsolete as well as the stockpile of preprogrammed PLL (phase locked loop) chips the CB manufacturers had at that time.

All interesting stuff though with the history and evolution of CB radio still there for all to see.

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Uncle P
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Uncle P


Call Sign : 26-CT-4640
Posts : 27
Times Thanked : 0
Join date : 2022-03-11
QTH or Location : Prescot, Merseyside
Equipment Used : Little boxes wi' knobs on and big metal stick thingy
Age : 57

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PostSubject: Re: 27.255MHz?    27.255MHz?  Icon_minitimeSat Sep 24, 2022 5:08 pm

Nicely added Victor. I am aware of the alphas but have never used them. That day will come no doubt if I ever decide to have the snip. For now though I'll make do with what I've got. An unmolested MacKinley....at least till the warranty runs out anyway 27.255MHz?  1f60f  Almost echoed my life story there too. Crap fishing tackle, cheap peripherals but never take chances with tyres and most certainly don't speed 27.255MHz?  1f607 

73's
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PostSubject: Re: 27.255MHz?    27.255MHz?  Icon_minitime

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