DRM MW Transmitter 30mW Test!
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Uploaded by am1098cquam on Apr 16, 2009
Running a DRM Transmitter 30mW Test at lab. Tx is set at a bit more than 30mW AVG power, connected at 50R load and with a 1m lead in parallel. Receiver was a modified ICOM PCR100 with a homemade IF converter board added at it. Rx antenna used was just a small homemade UHF whip with an added 1m lead. Distance between Tx lab workbench and Rx point was ~12m at a near seperate thru a wall, sideroom.
Encoder software was SPARK (www.drm-sender.de) for Tx, at 9KHz DRM spectrum, 0Hz IQ baseband, and a standard low cost PC audiocard. Frequency was 1440KHz (Medium Wave Band). SA span showing the DRM mask is set at 50KHz.
Rx Decoding software used is the SoDiRa v0.74 for DRM A & B modes, while also the DREAM was tested with better decoding results at DRM C mode!
Audio is added on video because of use of a camera without audio for this video. See our other video from the same tests with another camera with audio, provided a demo with the real audio captured while decoding our DRM testings...
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@bratina501 The AM CQUAM Stereo transmitter is designed based on a DDS & can't be downgraded by replacing the circuiytry to a PLL one! The extra features such as the week/day timer is totally software based and they don't add anything on the total cost of it, as there is no extra eletronic parts needed for them. So cost will not change with a removal of them. However you can find the CQUAM AM Tx unit as a ready made board without the plastic enclosure & keypad special panel for a lower amount
am1098cquam 1 year ago
I saw the AM stereo transmitter and it looks very nice but outside my price range and I don't need the majority of the features. I can get away with PLL synthesis rather than DDS and don't need an on/off timer.
bratina501 1 year ago
Hi
This is a DRM system transmitter. I think at US you use HD and the HD receivers will not decode a DRM signal. However if you want a unit you can find it at Ebay store "aspisys"
am1098cquam 2 years ago
I am interested in going digital, How do I get one for my part 15?
gccengineering1996 2 years ago
Yes we have got a licensed AAC+ with SPARK for Lab testings only! We jhave use it during the development phase of DrMax transmitter, and we also running lab tests for the upcoming complete 100W DRM MW/SW transmitter that will be available soon...
am1098cquam 2 years ago
do you use aac+ ? if it that, so how you add aac+ into spark ?
mousesleepy 2 years ago