Newbie help

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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.


Anyway, hope that helps.

All the best,
Victor

Thanks I'll have a look

You cant get the UK40 on a Jumbo you cannot tune to the off frequency to get on to them, intact when those radios where first built the never had FM fitted it was a after thought to help sell them in countries that also used FM (not uk FM by the way)  TBH they are not a very good radio for FM there more suited for AM /SSB really

@ Victor the ones that have had a UK 40 bord arnt that good anyway plus to do it properly it takes lot of work to get get reasonably good too ,a mate of has 4,a mk1 with just AM/SSB 40 CHANNEL only ,2 with AM/FM/SSB with Lo Mid Hi Channels which actually is really Mid/ Hi /Hi Hi one fitted with the Muppets board and its useless when on it  and a mk3 which has AM/FM/SSB  and has a 4 bands of 40 channels and none are really good on FM .

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

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.

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! 


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."


All the best,
Victor

Big Massey wrote:

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

You would have been able to get the UK40 if you had chosen the TriStar 777 because they have a proper course and fine clarifier which you could adjust to get the UK40,  me personally love the old school radios.

How would that work on the 777

Because it has a corse and fine clarifier ie: if you put the the radio on 33 hi (on a 777 will be ch73will explain later why) and put it on FM turn the corse part of the clarifier only to the left to about just over a 1/4 turn which by rights will bring you in line with UKFM40 well enough to be understood and use them ,the reason why its 73 is because the channel readout on Ham International radios are like that, its easier to show someone how to do it than explain TBH 
there is alot of other makes of old multimodes can do it .
I'm not being rude or anything I dont how long you have been around CB radio so forgive me in what I'm going to say ,I think you best bet is to one of the newer legal AM/FM/SSB radios because it's a lot less agro ie: something like the new Mc Kinley, it's just a bit of advise mate

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

http://www.ham-international.com/JUMBOEng.htm

This might you help you about Jumbos mate

Thanks but I just popped over to the guys house and swapped it over for the tristar777

Good choice mate ,a friend of mine just got his one out of storage from his collection of many many radios ,its a minter I know people often say that but this is in its original undamaged box looks like its brand new and it working a treat , by the way I hope my long winded explanation on how to get UK40 on a 777 was helpful, shame your not nearer to me cos it to show to than explain, well it is for me lol

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

OK if you need anymore advise just ask and if I can help I will, i know there is a lot of members on here may have been on CB in the 80s when it became legal but have never really used a old fashioned 70s  multimode.

Seems a good radio it was serviced by nick love black spirit in Wales the fella said

Excellent rig Doctor Nick is

At least I know it's working correctly lol

Have you tried to use it on the UK40 as I described on how to do it ?

Yeah got most of the UK FM channels minus the alphas

There is no alphas  on the uk40 so don't worry

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,