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Big Massey
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Call Sign : 108-CT-307
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PostSubject: Newbie help   Newbie help Icon_minitimeTue Feb 23, 2021 1:45 pm

.


Last edited by Big Massey on Wed Mar 17, 2021 6:10 pm; edited 1 time in total
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Victor
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Call Sign : 26-CT-3228 Ham M7VIC
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeTue Feb 23, 2021 4:31 pm

Hi Hugh,

We did have a frequency chart on Charlie Tango but think there was some faff about ownership.

Try the link here :-

https://delboyonline.blogspot.com/p/cb-radio-frequency-list.html


You'll see that Channel 16 High is 27.605Mhz with the nearest UK frequency being Channel 1 at 27.60125MHz.


Unless your Jumbo has a TX shift you'll be off frequency, so at best you'll sound off but heard by local operators due to the wide width most CB radio filtering offers. You'll be hard pushed to be heard further afield though. Your channel numbering will be also be totally off due to the U.S. F.C.C. frequency allocation with skips, jumps and what was known as 'Alpha' channels, (old Radio Control frequencies).

Surprised there's still Ham Jumbo's out there that haven't had the UK mod. Wink


Anyway, hope that helps.

All the best,
Victor

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Big Massey
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeWed Feb 24, 2021 7:43 pm

Thanks I'll have a look

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Big Massey
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeWed Feb 24, 2021 11:05 pm

Think I'll sell it back to the guy lol, I had an option of president McKinley MK1, a TriStar 777 or a ham Concorde2 and went for the jumbo 🙈
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53 Prefect
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53 Prefect

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PostSubject: Re: Newbie help   Newbie help Icon_minitimeWed Feb 24, 2021 11:58 pm

I seem to remember you could get to some of the UK40 frequencies, but not all, and it was a real faff to do it. So most never really bothered back in the day. Just stuck with our US AM channels.

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Victor
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeThu Feb 25, 2021 8:44 am

Such a shame because otherwise they're a pretty good rig. I hope you get to a successful conclusion.


As for conversion....

People often confused 'FM' (Frequency Modulation) with the term 'FM' meaning the UK 27/81 frequencies. As such the conversions were often never properly implemented with the appropriate shift to the UK frequency. So despite utilising FM modulation and a FM discriminator on some of the models, (I don't know many that would recognise a Foster-Seeley discriminator circuit), you would still be off-frequency and so sound quieter to the other station.

The result of this is that people would add 'power-mics' to the rig to overcome this and due to the varicap method of providing FM modulation begin to over-deviate the signal and again you'd actually sound quieter! (Or worse and be totally off frequency!)


You're right Martin in that it does take a fair bit of work to have it done properly.


I'm with Jeff (53 Perfect) on his conclusion. 

As a straight rig as it came off the drawing board it's still a good setup. UK CB frequencies are barely utilised in most of the UK nowadays anyway so hardly worth transmitting on. FM/AM & SSB on the old standard frequencies are used worldwide, (and even the 'mid-band' or straight US/Euro frequencies are legal in the UK now), making it still a useable rig. In fact, when the summer propogation is up they make for a good DXing rig and you don't have to worry about the weird UK frequency shifts! Wink


I hope you get sorted Hugh, but it'd be a shame to miss this summer's skip with that Jumbo for the sake of underutilised UK frequencies.

There's an old Engineering expression that comes to mind....

"Don't blame the hammer." Very Happy


All the best,
Victor

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Big Massey
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeThu Feb 25, 2021 11:13 am

How would that work on the 777 🙈
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Big Massey
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeThu Feb 25, 2021 12:58 pm

I was on radio for a long time in younger years but never had a multimode, I do run a 6900n and a few older FM rigs but the jumbo is first multimode of the older gen of rigs I'm just trying to fathom out the channels etc on it 🙂
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Big Massey
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeThu Feb 25, 2021 5:25 pm

Thanks but I just popped over to the guys house and swapped it over for the tristar777 😉
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Big Massey
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeThu Feb 25, 2021 6:37 pm

Not long winded at all I need all the help I can get to get my head around these older rigs lol totally appreciate the help and yeah visually it would be easier 🤣
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Big Massey
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeThu Feb 25, 2021 9:34 pm

Seems a good radio it was serviced by nick love black spirit in Wales the fella said
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Big Massey
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeSun Feb 28, 2021 11:36 am

At least I know it's working correctly lol
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeSun Feb 28, 2021 7:54 pm

Yeah got most of the UK FM channels minus the alphas
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stephen Gunrunner
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Call Sign : 26CT526/MR021/M6XXX26DD666.
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Equipment Used : sirio 4000 on tri mag base is the magnum257hp, mobile magnum257, and crt space-pmr
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PostSubject: Re: Newbie help   Newbie help Icon_minitimeTue Mar 02, 2021 2:47 pm

yes i can remember the day and all the good radios that were coming into the country and they were never used on fm as been said Am SSB Was the way i nearly got a ham jumbo but i did not silly money, i said if its that much i will get a good ham radio and wide band it and use all the freqs i am aloud to , there is some great fm am and ssb radios older radios and getting a good one its hit or a miss my self ask on the forum if any one has a good 10m radio for sale some one some were will have, enjoy the great hobby, Myself have two hobbys shooting target shooting and radio, but not been on as much as would like be , that is the best way ask in the group,

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