[App_rpt-users] Noisy Sound FOBS

Ron Simpson n6gkj.cm98 at yahoo.com
Thu Feb 23 00:15:15 EST 2012

Hey guys,

I just got in some really cheap CM108 type sound FOB's from China, they work, I use the DSP for COR and CTCSS with the DB25 pins for ptt. However, I am hearing some really noisy sound when I access this node. I setup a DMK URI on the same node, no noise. 

Has anyone encountered this before?

Is it the cheap sound FOB's or is there something else I need to do.

I have my audio voitage divider feeding the RX Input, I have that fed by a 10uf cap. No DC bias on the chip. I am feeding the FOB with a VHF Maxtrac 300 discriminator audio, JU551 in position A. plenty of audio, PL detect and COR is very reliable. I use this as a RX only node. A very simple hardware configuration.

Any ideas?

Ron Simpson,

N6GKJ Amateur Radio


Have you ever noticed that when you are looking for something, 

it is always found in the last place you look?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.allstarlink.org/pipermail/app_rpt-users/attachments/20120222/de276a73/attachment.html>

More information about the App_rpt-users mailing list