[App_rpt-users] Noisy Sound FOBS

[Ron Simpson]

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

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it is always found in the last place you look?
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