From:
kj6ko@innercite.comTo:
doug@crompton.comSubject: Re: [App_rpt-users] DMK URI questions
Date: Sat, 2 Nov 2013 00:13:15 -0700
Doesn't matter. It's a preference thing. By the time audio gets to the internet, it is all digitized and de-emphasized. What comes out the other end depends on what you want. If you are going to feed a modulator directly, you need pre-emphasized audio, and I don't think the URI will do that. It will de-emphasize DISC audio on RX. You should just use MIC audio into the radio and de-emphasized audio into the URI to keep it simple. I would ALWAYS use "CTCSS Valid" signal out of the radio (if avail) and feed the signal to the COS port of the URI.
COS and CTCSS are meant to be used together, like in a repeater, but it doesn't have to be
MIC DC and MIC AC?? you will have to read the radio manual on that one.
PS: DSP does NOT mean FLAT Audio. It means "Digital Signal Processing" and really has nothing to do with audio shape.
I guess I'm not sure what you mean by "DSP vs Simple USB"?? Is there a device called a "DSP?"
I'm guessing you should keep it simple and use the "Simple USB" because that is what it is...simple! Not much involved, Audio in, audio out, PTT Out and COR/CTCSS in.(Either or). For a CTCSS detect, you need to find something that will give a GND or +5VDC when an active PL Tone is received. I think the DMK device can do this for you if you don't have one on your radio, in which case you will HAVE to use discriminator audio for RX. The DMK will de-emphasize it before it goes out over the network.
----- Original Message -----
Sent: Friday, November 01, 2013 10:53 PM
Subject: [App_rpt-users] DMK URI questions
About a week ago I asked about DMK URI connections to an Alinco radio and I got several responses. I do have a few more questions regarding that.
The Alinco has both flat and pre/de-emphasized audio available on its data connector as 1200 baud and 9600 baud connections.
I assume I would use the 1200 baud connections along with COS and PTT for a simple USB interface and the 9600 baud connections along with just the PTT for a DSP interface?
Do I use the (Alinco 9600 baud) audio to the TX also? Does the DSP pre-emphasize audio or is the processing just on the receive side?
Why would I want to use one over the other (DSP vs simple USB)? Which is preferred and/or works better? I am thinking there might be some differing opinions here!
The DMK URI has both mic_DC and mic_AC inputs. Does this refer to frequency response or just that one has DC blocking?
If you are using flat response (DSP) would the audio in (from the receiver) connections at the URI end matter?
The DMK URI has both COS and CTSS inputs. Why would you use one over the other? When using DSP I assume neither is needed?All of the questions above assume I am using the Acid release on a faster processor.73 Doug
WA3DSP
http://www.crompton.com/hamradio
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