[App_rpt-users] DMK URI questions

[Chuck Henderson]

One thing that I liked about using the dsp for squelch and ctcss detect was
what I like to call "time travel" in that the first syllable spoken even
before the ctcss is detected, doesn't get lost.  I now use the voter
boards/RTCMs and that is hardware ctcss and squelch and now everyone using
the repeater has to remember to delay talking or the first syllable and
sometimes word will not be heard. but everything else about the voter
board/RTCM is great and I wouldn't go back.  But maybe a future 2nd or 3rd
generation voterboard will have a powerful enough CPU that it can also do
DSP squelch and ctcss, or at least have enough RAM that it can always be
storing audio even when no ctcss is detected so that it too can do the
"time travel" thing and never miss any audio while waiting to detect ctcss.

Before the voter boards/RTCMs, all I used was usbradio and DSP, and it
worked great and sounded great.
Chuck  WB9UUS



On Sat, Nov 2, 2013 at 11:57 PM, Johnny Keeker <cypresstower at yahoo.com>wrote:

>  I not sure how to interpret "you all are getting to far into the weeds,"
> I guess its to say done wasted your time experimenting. Personally I hold
> an opposing viewpoint, however I agree, with dont over think it, so I
> retract my previous comments and now say,
> "dont worry about audio quality use the default codec and *git-r done*."
> JK
>  *From:* Bryan D. Boyle <bdboyle at bdboyle.com>
> *To:* "<app_rpt-users at ohnosec.org>" <app_rpt-users at ohnosec.org>
> *Sent:* Saturday, November 2, 2013 8:06 PM
>
> *Subject:* Re: [App_rpt-users] DMK URI questions
>
>  you all are getting too far into the weeds...it ain't broadcast
> audio, though it can sound better than most repeaters on the air today.
> 9600  is fine; the levels you'll get are more than sufficient to work
> with.  don't forget to put it into data mode and lock it.  add in the
> rx boost, and you'll have more than you need to do whatever you want.
>  let asterisk dsp if you have the cpu chops do what it does. push composite
> back in, set your levels, and enjoy.
>
> don't overthink it...it's just not that complex.
>
> --
> Bryan
> Sent from my iPhone 5...small
> keyboard, big fingers...please
> forgive misspellings...
>
>
>
> On Nov 2, 2013, at 16:07, Johnny Keeker <cypresstower at yahoo.com> wrote:
>
>   Doug:
> I know the alinco has flat audio out pin 2 and de-emphasized audio on pin
> 4.
> Ive ran some experiments and use both sources on DR-135/235/and 435
> alincos.
> The output on pin 4 is around 84mV and 500mV on pin 2 on all radios.
> Please
> post your findings, Im curious to see what you come up with.
> Thank you,
> JK
>   *From:* Doug Crompton <doug at crompton.com>
> *To:* "app_rpt-users at ohnosec.org" <app_rpt-users at ohnosec.org>
> *Sent:* Saturday, November 2, 2013 1:53 AM
> *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 DougWA3DSP http://www.crompton.com/hamradio
> <http://www.crompton.com/hamradio>*
>
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