Looking for others using Raspberry Pi with Radio Shack Pro 106
- Thread starter N5JMC
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kb8zxe
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I am at work so I do not have all the info you are requesting at this moment. I am running a feed with a PI and 106 scanner. Brown County Fire and EMS I can post more information tonight if needed. I have had a lot of issues but currently it is sounding good I think.
In the past I had a bad sound card, with the scanner connected it sounded bad but when I would disconnect the audio cable it went away. I swapped the scanner and cables but it ended up being the sound card after all.
I also ran into issues trying to power the pi with a buck converter and scanner from the same 12 volt source. I have an external antenna which is grounded and bonded to the tower which is also connected to the negative of my battery string. This was creating a ground loop so I tried CATV isolation transformers. The isolation transformers messed with the CQPSK simulcast signal making the transmissions funny. I ended up powering the scanner from a ac to dc wall wart on a ups and that issue was solved. The PI is currently powered with a buck converter directly off of a 12 volt battery bank.
I have a homemade audio cable with isolation transformer and some resistors to drop down the audio. These seems to be the biggest help.
Finally, I was picking up the local am station one day very faintly in the back ground of the feed. Bonding the coax to the station ground next to the scanner took care of that.
So yes I have been through a lot but I am happy with audio quality. I also run 2 other feeds with PI's and PRO 197's. Pretty much the same applies to those feeds as well. If you want a sketch of my audio cable let me know. It's nothing special but I found it to be the key to making my feed have very little noise.
Good Luck
Bob
In the past I had a bad sound card, with the scanner connected it sounded bad but when I would disconnect the audio cable it went away. I swapped the scanner and cables but it ended up being the sound card after all.
I also ran into issues trying to power the pi with a buck converter and scanner from the same 12 volt source. I have an external antenna which is grounded and bonded to the tower which is also connected to the negative of my battery string. This was creating a ground loop so I tried CATV isolation transformers. The isolation transformers messed with the CQPSK simulcast signal making the transmissions funny. I ended up powering the scanner from a ac to dc wall wart on a ups and that issue was solved. The PI is currently powered with a buck converter directly off of a 12 volt battery bank.
I have a homemade audio cable with isolation transformer and some resistors to drop down the audio. These seems to be the biggest help.
Finally, I was picking up the local am station one day very faintly in the back ground of the feed. Bonding the coax to the station ground next to the scanner took care of that.
So yes I have been through a lot but I am happy with audio quality. I also run 2 other feeds with PI's and PRO 197's. Pretty much the same applies to those feeds as well. If you want a sketch of my audio cable let me know. It's nothing special but I found it to be the key to making my feed have very little noise.
Good Luck
Bob
I'd like to get that additional info if you don't mind. Also pics of your setup like how you power the scanner and pi. I would like to get this resolved. Have you listened to my feed to see if it sounds similar with yours?
I sent you a pm on Tapatalk with my email. If you don't get it I'll login to rr.com and send it.
Sent from my iPhone using Tapatalk
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