kb8ude@gmail.com wrote:
I am still testing my hardware here on a dummy load and having strange behavior. First, my hardware:
Dell P3 1.13GHz server, 1gb RAM, 36gb SCSI drive, installed via ACID CD. URI interface, output cable about 6 inches long, twisted but not shielded. Motorola Radius M120 UHF turned down to 20W. Set as a simplex link and the channel is set to carrier squelch.
Set my audio levels using a Motorola service monitor.
Sometimes when the radio transmits I get clear voice. Most of the time there is a noticeable low frequency oscillation on the signal and the audio is unreadable. Almost sounds like mid-rpm engine ignition noise if that helps paint a cleare picture of the sound. RX seems good, I am listening using iaxrpt on the pc and can hear myself slightly delayed and clear.
I tried a couple ferrites on both sides of the URI with no change. I also noticed that sometimes the 'connected' announcement has a ripping or tearing sound to it as well as stuttered courtesy tones on occasion. I am wondering if my server just isn't fast enough or if the URI needs a 2.0 USB port to plug into.
Any thoughts folks?
-Shawn
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Slow PC: If you run the 'top' command from the linux shell command line, how much CPU is being consumed by asterisk? More than 25% is asking for trouble. Try a faster pc and see if it clears up the problem. Audio oscillations: It's hard to say what might be wrong. This could be CPU speed related, interface adjustment related, or a grounding/ground loop issue. It wouldn't hurt to look at the URI audio output with the scope in your service monitor while it is oscillating. BTW: Ferrites are no good at reducing noise at audio frequencies. Steve WA6ZFT