Pro 197 FMN- vhf setting

[AlphaFive]

I am working on a conventional vhf taxi system in Asheville. They are narrow fm. I set my EXPERT modulation setting to NFM and saved the settings individually for each input and out channel in the system. (the system is WQCB664) The modulation still sounds like a furry little chipmunk. Someone please let fumblefingers know if I have missed a step in my settings, or perhaps I am trying to listen to some type of encrypted system. I can't locate any specific information in files other than 'conventional'.

 

[RonnieUSA]

The License shows the as Wide FM still, not Narrow.

ULS License - Industrial/Business Pool, Conventional License - WQCB664 - J & J CAB SERVICE INC DBA YELLOW CAB BLUE BIRD & BEAVERLAKE - Frequencies Summary

Emission: 20K0F3E
From the Wiki:

20K0F3E * 5 kHz deviation FM "wideband 25 kHz" analog voice

 

[AlphaFive]

Pro 197 FMN vhf setting

Thank you very much, that explains why when I had the modulation setting on automatic the hit listed it as FM, not nfm. I am going to have to dig a little deeper to find out why I am receiving Chester the Chipmunk..

 

[RonnieUSA]

Thank you very much, that explains why when I had the modulation setting on automatic the hit listed it as FM, not nfm. I am going to have to dig a little deeper to find out why I am receiving Chester the Chipmunk..

The bad thing about the 197's and the 106's is unless You set it to NFM You will always see FM, not sure why they choose to do it that way.

 

[gewecke]

Thank you very much, that explains why when I had the modulation setting on automatic the hit listed it as FM, not nfm. I am going to have to dig a little deeper to find out why I am receiving Chester the Chipmunk..

Are you SURE that the service you are listening to is not using inversion scrambling? Many taxi services have used this to keep other taxi services from stealing their fares. 73, n9zas

 

[AlphaFive]

Pro 197 FMN - vhf setting

Thanks so much, that's what I'm looking for. A year or so ago I had seen a passing reference about taxi companies using some type of encryption, and I couldn't find any recent information. Now I have something to work on. There's no doubt it's encrypted-scrambled-purposely distorted, thanks to Ronnie my settings are right, now I have a term to follow

 

[AlphaFive]

Quick shoutout of thanks. Reviewed R.R. posts on 'inverted scrambling', that's what I am receiving.