without signalDetectorThreshold parameter set, im not picking up any signal

[israelgoldstein]

Trunk-Recorder: Version: 5.0.0
what would cause my one site, to require the following parameter in the source to be set,

"signalDetectorThreshold": -65,

i dont use this at other sites i run trunk-recorder
but this site, without it, it wont pickup any signal

any help ?

Source:

"center": 482700000,
"rate": 2048000,
"driver": "osmosdr",
"device": "rtl=40000402",
"error": 0,
"-ppm": 0,
"gain": 12,
"-gainSettings": {},
"-ifGain": 0,
"-bbGain": 0,
"-mixGain": 0,
"-lnaGain": 0,
"-vga1Gain": 0,
"-vga2Gain": 0,
"-antenna": "",
"-digitalRecorders": 0,
"-analogRecorders": 0,
"agc": false,
"signalDetectorThreshold": -65,
"-comments": "",
"enabled": true

System:

"type": "conventional",
"shortName": "fdny401",
"-talkgroupsFile": "",
"channelFile": "FDNY_1_channels.csv",
"-control_channels": [],
"-channels": [],
"-modulation": "",
"squelch": -40,
"-apiKey": "XXXXXXXXXXXXXXXXXXXXXXXXXX",
"-analogLevels": 2,
"-maxDev": 2000,
"-digitalLevels": 1,
"-unitTagsFile": "",
"-recordUnknown": false,
"-recordUUVCalls": false,
"-hideEncrypted": false,
"-hideUnknownTalkgroups": false,
"maxDuration": 20,
"-minTransmissionDuration": 0,
"-talkgroupDisplayFormat": "id",
"uploadScript": "/home/pi/scripts/tr_extender/upload.sh fdny401",
"-unitScript": "",
"compressWav": true,
"audioArchive": false,
"-transmissionArchive": false,
"callLog": true,
"defaultMode": "analog",
"-decodeMDC": false,
"-decodeFSync": false,
"-decodeStar": false,
"-decodeTPS": false,
"enabled": true

the parameters with a leading -,
is there as a placeholder - so i could have 1 format i use for all systems, and change parameters accordingly.