[Asterisk-Users] Terrible crackling on analogue line and X100P card

[Paul]

On Sat, 9 Apr 2005, Stuart Ford wrote:

>  
>
>>Dear all ...
>>
>>I'm experiencing terrible trouble with crackling and noise on an
>>analogue line connected to an X100P (compatible) card. I've checked the
>>line with a normal analogue phone and it works fine, clear as a bell,
>>but any outgoing or incoming calls to Asterisk are almost completely
>>drowned out by loud crackling.
>>
>>I've attempted to adjust the RX and TX gains, but to no avail. There's
>>also an echo, but only one way. I'm assuming this is a separate issue so
>>I've not done much to investigate that, but I may be wrong so if it is
>>related does anyone have any suggestions?
>>
>>I never had this trouble with ISDN, but then I wouldn't would I? :)
>>
>>If anyone can wave a magic wand, or at the very least point me to a
>>website where I can get my own magic wand, please let me know.
>>
>>Thanks
>>
>>Stuart
>>    
>>
Maybe a filter or isolation transformer is needed. Maybe both. Ask a ham 
radio enthusiast about such things. Maybe we have one reading this list?