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Author Topic: WIN DRM fantastic audio  (Read 3400 times)
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w3duq
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« on: March 30, 2007, 01:11:00 PM »
I have been playing with WINDRM (digital radio mondale) and the results have been nothing short of spectacular! Excellent quality and signal to noise. The received signal can be so weak you cant see it on the receiver and you still get a full quality voice signal using the SDR1000 FLEX RADIO. The signal is only 2.8khz wide and doesnt "splatter" like all analog modes do.

If you have a FLEX and want to play, email me and I can send you a FREE STARTUP KIT using WINDRM software.

Bill
w3duq@ptd.net
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bill  w3duq
k4kyv
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Don
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« Reply #1 on: March 30, 2007, 02:33:30 PM »
At 2.8 kHz bandwidth of the digital signal, do you still get audio frequency response and voice quality comparable to the analogue signals transmitted by the better sounding amateur AM signals on the air to-day?

The German DRM station at 3995 kHz is a full 10 kHz wide, but I'm not sure what kind of audio they are attempting to transmit.
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Don, K4KYV                                       AMI#5
Licensed since 1959 and not happy to be back on AM...    Never got off AM in the first place.

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w3duq
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« Reply #2 on: March 30, 2007, 04:56:27 PM »
Yes you DO get FULL fidelity-music quality audio in a 2.8khz bandwidth, that's the amazing thing about drm.
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bill  w3duq
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« Reply #3 on: March 30, 2007, 05:40:49 PM »
See my email Bill....
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73 de W5AMI - Brian
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WA1GFZ
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« Reply #4 on: March 30, 2007, 08:31:14 PM »
Bill do you need an I/Q input to the sound card or just a low IF? 
one of my Racals has a 6.4 KHz baseband output or i could use the unit with the homebrew I/Q at 7.625 KHz gfz
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WBear2GCR
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« Reply #5 on: April 01, 2007, 10:27:51 AM »
Don't hold ur breath...

In another 20 seconds, you'll be "transmitting" in DRM on the ham bands...

            _-_-bear
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_-_- bear WB2GCR                   http://www.bearlabs.com
w3duq
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« Reply #6 on: April 01, 2007, 12:51:47 PM »
Frank:
Just the output of your sound card. It is designed for 11khz wide sound card.
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bill  w3duq
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