BC92XLT rounds frequencies off to the nearest and cant listn
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slipknot
- 150+ posts
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- Joined: Thu Dec 07, 2006 7:04 pm
- Scanners and Receivers: Yaesu FT-857 Yaesu FT7800 Icom ID800H
- Location: Perth
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BC92XLT rounds frequencies off to the nearest and cant listn
My BC92xlt scanner seems to round some freqencies off to the nearest. i porgram fire frequencies like 159.0125 and them my scanner rounds it off to 159.015. im not sure why but dose it mean that i cant listen to that frequency?
Up until ten or so years ago frequencies in VHF (68-88 MHz and 136-174MHz) were allocated on 15kHz steps. Scanners operated on 5kHz steps so there was no problem. Spacing of 12.5kHz was introduced, and if you had a scanner where you could select 5/12.5/25 khz spacing you were fine, but scanners with 5kHz spacing only would be 2.5kHz 'out' on some frequencies. In my experience this wasn't a problem - scanners had sufficient bandwidth to receive signals when 2.5kHz 'out', though not having accurate readout of the frequency was annoying.
I've had a look at the 92XLT operating manual online and it says that it does 12.5khz steps in VHF to suit the current allocations. However, the radio's display appears to have only three digits displayed to the right of the decimal point. The manual says that if your enter a frequency with four digits after the decimal point (for example 168.7125) , 'the scanner automatically rounds the entered number to the nearest valid frequency'.
My reading of that is that even though you're seeing 159.015, you're actually hearing 159.0125.
It's a minor thing for sure, but some scanners (like my 17-year-old Realistic PRO-2004) have four digits to the right of the decimal point and display the full frequency.
I've had a look at the 92XLT operating manual online and it says that it does 12.5khz steps in VHF to suit the current allocations. However, the radio's display appears to have only three digits displayed to the right of the decimal point. The manual says that if your enter a frequency with four digits after the decimal point (for example 168.7125) , 'the scanner automatically rounds the entered number to the nearest valid frequency'.
My reading of that is that even though you're seeing 159.015, you're actually hearing 159.0125.
It's a minor thing for sure, but some scanners (like my 17-year-old Realistic PRO-2004) have four digits to the right of the decimal point and display the full frequency.
How old is your 92?... I just grabbed mine which is 2 years old and banged 150.01250 straight into it. The display shows 159.012 in the large(normal) sized numbers and the 50 is on the right hand side of those digits in a smaller font. It is true however that if you enter a freq for example only like 159.01230 then yes it will round out to the nearest 12.5khz step which would be 159.01225. Hope this helps.
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slipknot
- 150+ posts
- Posts: 662
- Joined: Thu Dec 07, 2006 7:04 pm
- Scanners and Receivers: Yaesu FT-857 Yaesu FT7800 Icom ID800H
- Location: Perth
- Contact:
well there is a 25, 50 and 75 really small next t the end but dosnt always accept it. in thr 400 mhz range its very detail and will accept just about any, but unfortuneatly i have been sent the wrong scanner , designed for USA use, and one thing thats annoying about it is that its very simular to the Ubc92xlt which is AU version. the us version misses 50mhz to 80mhz , and 400mhz to 410mhz which is very very annoying.Steve wrote:Up until ten or so years ago frequencies in VHF (68-88 MHz and 136-174MHz) were allocated on 15kHz steps. Scanners operated on 5kHz steps so there was no problem. Spacing of 12.5kHz was introduced, and if you had a scanner where you could select 5/12.5/25 khz spacing you were fine, but scanners with 5kHz spacing only would be 2.5kHz 'out' on some frequencies. In my experience this wasn't a problem - scanners had sufficient bandwidth to receive signals when 2.5kHz 'out', though not having accurate readout of the frequency was annoying.
I've had a look at the 92XLT operating manual online and it says that it does 12.5khz steps in VHF to suit the current allocations. However, the radio's display appears to have only three digits displayed to the right of the decimal point. The manual says that if your enter a frequency with four digits after the decimal point (for example 168.7125) , 'the scanner automatically rounds the entered number to the nearest valid frequency'.
My reading of that is that even though you're seeing 159.015, you're actually hearing 159.0125.
It's a minor thing for sure, but some scanners (like my 17-year-old Realistic PRO-2004) have four digits to the right of the decimal point and display the full frequency.
IIRC the 159ish freqs for fire are actually only the handheld incident radios. Unless you are very close to an active incident you won't hear anything. the range you said that is missing means you won't be able to listen to much in teh way of fire comms as they are around the 78mhz mark.
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I think you'll be okay actually: you should able to pick up a transmission if you're 2.5Khz 'off target'.
78.4125, for example, should be able to be heard on 78.410 or 78.415 (though if your scanner is US spec it won't include the 70-80MHz band) and 159.010 or 159.015 should be okay to hear 159.0125.
78.4125, for example, should be able to be heard on 78.410 or 78.415 (though if your scanner is US spec it won't include the 70-80MHz band) and 159.010 or 159.015 should be okay to hear 159.0125.