Configuration Enquirey.

[ve3opc]

I am curious as to what exactly is going on when we configure a radio for the Bell Fleetnet System.
IE 38= lo channel 759 = Hi channel Offset = 390 Base = 141.015 Step = 15 . I get the last I asume its checking the band in 15 KHZ steps but the rest leaves me somwhat preplexed.

 

[exkalibur]

It sets the channel ranges for the radio.

Basically, the trunking control channel only says "go to channel 552". The radio uses this band plan to calculate what frequency channel 552 is.

 

[ve3opc]

Thats a bit vauge for my comfort but thank,s for getting back to me .. I understand the princples of Duplexing, Offsets, and so on and am sure there is more going on here.

 

[takeme]

programming fleetnet

i was confused as well. i put in only one of the base frequencies 141.015 and as the high i just guess a range higher than the band like 156.0 with 380 and 15khz

and on plan 2 i put the base as 151xxcx 579 and 15khz
and on plan 3 i put the base as 154xxxx 632 and 15khz

what confused me is when they ask for the high frequency - i was not sure what to put in there?

not sure if we are talking about the bct15x - but thats what i am using - seems different when you input
fleetnet unlike other scanners that specifically ask you for all three figures and not the high frequency

 

[slicerwizard]

I am curious as to what exactly is going on when we configure a radio for the Bell Fleetnet System.
IE 38= lo channel 759 = Hi channel Offset = 390 Base = 141.015 Step = 15 . I get the last I asume its checking the band in 15 KHZ steps but the rest leaves me somwhat preplexed.

It would help if you posted the correct values rather than 38, 579 and 390.


A bandplan simply defines the relationship between channel numbers and their corresponding frequencies.

380 to 758 means just that - the bandplan defines the formula to use for channels 380 to 758.

Offset indicates the value to subtract from a channel number before multiplying in the step size.


So for channel 500, for example,

frequency = base + (channel - offset) x step

frequency = 141.015 + (500 - 380) x 0.015

frequency = 142.815

 

[ve3opc]

Perfect now that makes sence! Cheers.

 

[mikewazowski]

To add to Andrew's explanation, the Control Channel sends out channel numbers.

It uses the steps that Andrew posted to convert the channel number to a frequency.

 

[ve3opc]

Yea it makes perfect sence now. I just hate going through processes unable to comprhend what exactly is takeing place thanks guy,s.

 

[takeme]

vhf trunking for bct15x

thanks slice, thats the best formula i have seen on here!

now my problem with the bct15x is when i am programming my system and i am putting in the base frequency- it next goes to UPPER frequency and polarity, which i never seen before in programming this system in other scanners.

what i am trying to do is:

1 system with 3 band plans.

141.015, 15khz, 380
151.730, 15khz, 579
154.320, 15khz, 632


so what would i put in when it asks for Upper frequenices for each and polarity +/-


thanks TM

 

[ve3opc]

Thanks for the thanks but I wasent the guy with the formula so give credit where its do. I kind of get the jist of how this all works but I also am a little uncertain . I am working with the PS 600 which dosent ask for a high spec or polarty. I understan also how the control channel changess frequency pairs but dont know enough about Fleet Maps to full appreciate what is happening all I know so far is it works.

 

[takeme]

thanks T or D , I think i will post a new question out there. but I am glad i understand the formula now.

 

[ve3opc]

LOL I see you do your research. Its T over D.

 

[ve3opc]

Well we are on the Topic of Licence Informtion would you happen to have Industry Cannada Database of Frequency Licensee info ?. I used to have it and cant seem to locate it anymore its burried to deep in thier buerocrocy poop..

 

[EJB]

thanks slice, thats the best formula i have seen on here!

now my problem with the bct15x is when i am programming my system and i am putting in the base frequency- it next goes to UPPER frequency and polarity, which i never seen before in programming this system in other scanners.

what i am trying to do is:

1 system with 3 band plans.

141.015, 15khz, 380
151.730, 15khz, 579
154.320, 15khz, 632


so what would i put in when it asks for Upper frequenices for each and polarity +/-


thanks TM

Andy has always gone to great lengths to explain many things to many people on here who ask questions. His answers are direct and to the point.

Thanks for helping me out many times in the past, your contributions make explaining and following this hobby easier

 

[mikewazowski]

Well we are on the Topic of Licence Informtion would you happen to have Industry Cannada Database of Frequency Licensee info ?. I used to have it and cant seem to locate it anymore its burried to deep in thier buerocrocy poop..

Search for Spectrum Direct.

It's Industry Canada's webpage that allows you to search licence information.

 

[Bullmax]

thanks slice, thats the best formula i have seen on here!

now my problem with the bct15x is when i am programming my system and i am putting in the base frequency- it next goes to UPPER frequency and polarity, which i never seen before in programming this system in other scanners.

what i am trying to do is:

1 system with 3 band plans.

141.015, 15khz, 380
151.730, 15khz, 579
154.320, 15khz, 632


so what would i put in when it asks for Upper frequenices for each and polarity +/-


thanks TM

Is this what you are looking for?

band plan 1 input lower-141.0150 input upper 143.9850 set offset to 380 + polarity set spacing to 15.00khz.
band plan 2.input lower-151.7300 input upper152.5100 set offset to 579 + polarity set spacing to 15.00khz.
band plan 3. input lower-154.3200 input upper 156.2250 set offset to 623 + polarity set spacing to 15.00khz.

 

[slicerwizard]

now my problem with the bct15x is when i am programming my system and i am putting in the base frequency- it next goes to UPPER frequency and polarity, which i never seen before in programming this system in other scanners.

what i am trying to do is:

1 system with 3 band plans.

141.015, 15khz, 380
151.730, 15khz, 579
154.320, 15khz, 632


so what would i put in when it asks for Upper frequenices for each and polarity +/-

Wow, the folks at Uniden never cease to amaze me.

When a system uses multiple bandplans (as Fleetnet does), receivers need to know which channel numbers are covered by each bandplan. For Fleetnet, since the second plan starts at channel 579, it's obvious that the first plan ends at channel 578. Similarly, since the third plan starts at channel 632, the second plan ends at channel 631.

So we have:

141.015, 15kHz, 380-->578
151.730, 15kHz, 579-->631
154.320, 15kHz, 632-->?

So what's the top end of the third plan?

Since VHF/UHF systems use channel numbers 0 to 379 for repeater inputs, the channel numbers for repeater outputs have to range from 380 to 759 (e.g. 380 input channel numbers and 380 output channel numbers)

Polarity refers to whether frequencies get higher or lower as channel numbers increase; only Motorola 800 MHz systems with shuffle bandplans use negative polarity, so VHF/UHF systems always use positive polarity.

So it's not hard to fill out the entire table:

141.015, 15kHz, 380-->578 +ve
151.730, 15kHz, 579-->631 +ve
154.320, 15kHz, 632-->759 +ve

And from what I've seen, that's the bandplan data that GRE scanners ask for.


But instead of the easy to figure out high/low channel numbers, Uniden wants high/low frequency values?? What the hell were they smoking when they made that decision?

So users have to perform extra steps to figure out what frequencies correspond to channel numbers 578, 631 and 759:

frequency = base + (channel - offset) x step

high1 = 141.015 + (578 - 380) * 0.015 = 143.985

high2 = 151.730 + (631 - 579) * 0.015 = 152.510

high3 = 154.320 + (759 - 632) * 0.015 = 156.225

So for Uniden XTs, the table is:

141.015-143.985, 15kHz, 380 +ve
151.730-152.510, 15kHz, 579 +ve
154.320-156.225, 15kHz, 632 +ve


So if scanner manufacturers were in the flyer delivery business, GRE would tell you "Deliver 100 flyers"

Uniden would tell you:

"Deliver flyers at the rate of one every 15 seconds and stop after 25 minutes"

Um, say what? So you want me to deliver 100 flyers? Did I calculate that right? Why didn't you just say 100?

Unbelievable...

 

[takeme]

WOW slicerwizard your my hero of the week. I am going to print this and keep it, I am sure i will have to refer to it sometime down the road.

 

[EJB]

WOW slicerwizard your my hero of the week. I am going to print this and keep it, I am sure i will have to refer to it sometime down the road.

Andy, your dance card is gonna be full with all the acculades and the love. Again, if you need me to chaperone....

 

[ve3opc]

Heap Errors!

Trying to load Bins and either getting Nothing Enabled from Scanner or Heap errors like Heap Error 215521 % 215c. Any assistance on what I might be doing wrong . ?