PMR 446 Frequencies

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Re: PMR 446 Frequencies

Postby m0bob » Thu Oct 17, 2013 12:13 pm

Many thanks.
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Re: PMR 446 Frequencies

Postby Frequency Hopper » Wed Nov 11, 2015 12:07 am

Does anyone hear much on the dPMR frequencies? I ask as I do not have a dPMR set or receiver so do not monitor but I have noticed increased users on simple light frequencies using DMR instead of analogue so I was curious if dPMR was starting to take over analogue 446 in the way of usage?
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Re: PMR 446 Frequencies

Postby Alfie » Wed Nov 11, 2015 12:55 am

Frequency Hopper wrote:Does anyone hear much on the dPMR frequencies? I ask as I do not have a dPMR set or receiver so do not monitor but I have noticed increased users on simple light frequencies using DMR instead of analogue so I was curious if dPMR was starting to take over analogue 446 in the way of usage?

they are not even making a whisper never mind taking over! i got the aor dv-1 with all dpmr 446 channels and so far heard nothing. analogue 446 still busy as anything though with annoying kids, motorbike trainers, schools, argos, sports direct, musuem, and every other tom, dick and harry :thumbup:
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Re: PMR 446 Frequencies

Postby Chainsaw » Wed Nov 11, 2015 1:06 am

Hi,

I understand how to input freqs and select fm, nfm etc.. on my Uniden 3500 but not quite sure how I enter the 6.25 steps required for these PMR446 freqs.
I have seen references to different steps for different bands etc.. but never bothered with it mainly because I am not sure how I do this on my 3500.

I have set my 3500 to band plan 3 as suggested by most people but how do I individually set step sizes?

Cheers,

Chainsaw
Bearcat 3500XLT (My 3rd one!). Watson 881. Gonna build me a Bow Tie soon. :-)
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Re: PMR 446 Frequencies

Postby Alfie » Wed Nov 11, 2015 1:14 am

Hi Chainsaw. i dont have the Uniden 3500 but the good news is it does 6.25 so you should be able to program 446 in bang on frequency :walkietalkie:

Have you tried going into the menu and changing step size ? you should have the following options...

5, 6.25, 7.5, 8.33, 10, 12.5,15, 20, 25, 50 or 100 kHz

you want it set to 6.25 :thumbup:

then program the following in your memories...

446.00625
446.01875
446.03125
446.04375
446.05625
446.06875
446.08125
446.09375
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Re: PMR 446 Frequencies

Postby m0lsx » Wed Nov 11, 2015 8:22 am

If you have not found it yet, the link below is the easy to use manual..

http://marksscanners.com/3500/3500.shtml

Automatic Channel Setup - accepts frequencies on any valid channel step, even if it does not fall within the band plan's default step.


There is no step selection for programming channels because the scanner will automatically accept any available step size.
Buy a database from Kimmy JS19 via http://ukscanningdirectory.co.uk/
Or do Google search of this forum via https://www.google.com/cse/home?cx=partner-pub-6291336405621919:2662881632
73 De Alan (M0LSX.)
http://www.qrz.com/db/M0LSX"
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Re: PMR 446 Frequencies

Postby Chainsaw » Wed Nov 11, 2015 11:58 pm

Cheers both.
I do have the Easier To Read Manual, I downloaded that before I bought my scanner :biggrin:

I did have a quick look for step sizes but must admit to not finding it.

maybe its BCTool+ then?
I have programmed frequencies with 6 decimal places and BCTool has knocked it back to 5 (or was that 5 decimal places knocked back to 4??) :-(

I will have a play in a bit and see what happens.

Cheers again.

Chainsaw
Bearcat 3500XLT (My 3rd one!). Watson 881. Gonna build me a Bow Tie soon. :-)
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Re: PMR 446 Frequencies

Postby Chainsaw » Thu Nov 12, 2015 12:28 am

Right,

I have just had a play.
I used BCTool+ and changed my frequency from (say Channel 1) from 446.0062 to 446.00625 and it seemed to stay. I programmed the next one from 446.0187 to 446.01875 and that seemed to stay.
I saved the programming, cleared and reloaded into BCTool+ and it was back to original 446.0062 etc..

So I tried programming the 3500 directly as I did with BCTool+ and exactly the same happened and I was back to 446.0062 etc..??

So how do I get it to stay at 5 decimal places, or even 6 for digi PMR?

Confused now. :sad:

Chainsaw
Bearcat 3500XLT (My 3rd one!). Watson 881. Gonna build me a Bow Tie soon. :-)
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Re: PMR 446 Frequencies

Postby G4RMT » Thu Nov 12, 2015 1:03 pm

You don't - the stability of most PLL chips cannot set an accuracy level of the tiny amount you want to do, so 6.25KHz or 6.2KHz is a 50Hz difference, and insignificant. I would imagine two identical radios at anything less than military grade can't do this level of accuracy. Motorola typically quote stability of 0.00025% Do the maths on a frequency of 450,000,000Hz and you'll see why these tiny differences are insignificant. Letting you enter the number is one thing - actually sitting on that sub-division is another. I have a couple of radios that do sit happily on 6.25 channels, but don't have the digits to display it.
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Re: PMR 446 Frequencies

Postby Chainsaw » Thu Nov 12, 2015 8:03 pm

Ok Cheers for that info.

So am I getting confused still?

Do we need to know the step size if we are entering a known frequency to store on the 3500 (or any other scanner).
To me it sounds like the step sizes are only needed if searching, not scanning?

Chainsaw
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