Well, what could be useful here is an interface in the UDR56K that presents the raw digital audio data, so it can be processed by an external AMBE (or whatever) decoder, making an external transcoder

True, but in my experience, there is still a big difference between transcoding to PCM and going all the way to analog and back. With the latter, you add a D/A and A/D converter, you're relying on

Depending on what the bit rate is for NXDN, there may only need to be a conversion to and from D-Star's bit rate; does anyone know that information off-hand? The nice thing is that we probably won't

Fair enough, I stand corrected. Even as I hit send, I more or less knew I was wrong and should have said simply "uncompressed audio". Still, every time you convert to a lossy format, audio data is

But you are NOT passing analog audio down the USB cable. You're passing digital PCM to a USB sound device built into the radio. Semantics are important in this discussion, and my point still stands,

Yes, there are several high end transceivers that have an integrated sound card specifically for use on the various HF digital modes. Matthew Pitts N8OHU Sent from Yahoo! Mail on Android

Usb soundcard?!? Dg9bfc Sigi

Well, that one's easy, the audio is still in digital form, it's rather like a serial dongle and a sound fob on the one USB hub. :) 73 de VK3JED / VK3IRL http://vkradio.com

___Original Message_________________________________________ From: "Tony Langdon, VK3JED" <vk3jed@...> Date: Thu, 2 Aug 2012 Time: 07:32:08 Yup. I do it every day. On my TS-590S. Mostly analog data

Hmm. Not sure how they do it but the IC-7200 passes the audio over a USB connection in parallel with the CI-V commands. Howard VK4BS

This one tickled my fancy ... Perhaps one could modulate the 5v line? Just sayin' ... ;-) -- Thanks! & 73, KD4E.com David Colburn nevils-station.com I don't google I SEARCH!

Little bit of power supply hum there, and some signs of RF feedback. ;) 73 de VK3JED / VK3IRL http://vkradio.com

No, the DV dongle converts a PCM bitstream to an AMBE coded bitstream and vice-versa. There is no analog audio near a DV Dongle (have you ever managed to get an analog signal down a USB bus? ;)

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Maybe your all confused... audio doesn't have to come out a speaker to be analog. To be perfectly clear, the dv-dongle is still converting a digital signal to an analog one... and a second chip is

Hi Reid, DMR is NOT one of the modes supported at launch. There has been some interest in DMR mostly in a future duplex repeater configuration which doesn't require turning the PA around. As a

Will the UDR56K4 be able to support the switching speeds required for DMR? -Reid N0RC

Agree totally, all the supervisory information needs to be handled properly. I'd like to see this sort of work happen. As for the technologies, I'm wary of TDMA, because it has inherent range limits

Tony, Exactly; all of the DV technologies I mentioned use some form of AMBE, so it's a matter of conversion of bit rates and constructing the proper carrier code for the target system. We already