[BAND PLAN MATH] Trunk Recorder - Find Median Band Plan

[melona380]

I'm trying to use trunk-recorder to record site 28's traffic from this system
South Dakota State Radio System Trunking System, Statewide, South Dakota - Scanner Frequencies
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Custom Frequency Tables For System 2315

Base Spacing Offset
155.41500 15.0 380
157.20000 12.5 436 *
157.47000 15.0 454 *

*The 2nd and 3rd Entry's apply to our freqs
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We need to cover

site Channel FREQ
28 449 157.3625
28 592 159.5400
28 608 159.7800
28 617 159.9150
28 627 160.0650
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ALL Freqs ex. 449 work with:

Base Spacing Offset
157.47000 15.0 454
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Channel 449 Needs this band plan:

Base Spacing Offset
157.20000 12.5 436
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The following is from the github page for trunk recorder:

-bandplan - [SmartNet only] this is the SmartNet bandplan that will be used. The options are 800_standard, 800_reband, 800_splinter, and 400_custom. 800_standard is the default.

-bandplanBase - [SmartNet, 400_custom only] this is for the 400_custom bandplan only. This is the base frequency, specified in Hz.

-bandplanHigh - [SmartNet, 400_custom only] this is the highest channel in the system, specified in Hz.

-bandplanSpacing - [SmartNet, 400_custom only] this is the channel spacing, specified in Hz. Typically this is 25000.

-bandplanOffset - [SmartNet, 400_custom only] this is the offset used to calculate frequencies.

^We can only add each of there once per system or it breaks

our current config is as follows:

"systems": [{
"control_channels": [159780000,160065000],
"type": "smartnet",
"talkgroupsFile": "/opt/trunk/ChanList.csv",
"shortName": "LakeDigital",
"bandplan": "400_custom",
"bandplanBase": "157470000",
"bandplanHigh": "162045000",
"bandplanSpacing": "15000",
"bandplanOffset": "454"
}]

AGAIN WITH THIS WE CANT GET CHAN 449!

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***SORRY ABOUT ALL THE JUNK HERE IS THE REAL PART ***

My Question is since we have 4 channels on one band plan and 1 on another bandplan, is there a mathematical middle we could compute?

I have made a very crude excel fuzzing calc if you want to play with it: https://transfer.sh/Tfy6k/BP CALC.xlsx
I want to stay away from making the different band plan channel 449 its own system in trunk-recorder!
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**NOTE

I am aware that RR says we do not use Channel# 449... but I promise you a lot of our traffic goes over it

Site Name County Freqs
028 (1C) Madison Lake 159.540 159.780c 159.915 160.065a


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Our Fix for the software Request is : https://github.com/robotastic/trunk-recorder/issues/138

 

[talkpair]

My Question is since we have 4 channels on one band plan and 1 on another bandplan, is there a mathematical middle we could compute?

It cannot be done using a single line from the band plan.

It seems strange that the program won't accept multiple lines, because the 800 mHz rebanded plan contains more than a single line in it's plan.