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Reviews Categories | Ham radio kits | Universal DRM- miniature mixer unit (surface mount) 10.7Mhz Help

Reviews Summary for Universal DRM- miniature mixer unit (surface mount) 10.7Mhz
Universal DRM- miniature mixer unit (surface mount) 10.7Mhz Reviews: 2 Average rating: 4.0/5 MSRP: $58,58euro +VAT taxes and shippin
Description: Universal downmixer unit from 10,7 MHz to 12 KHz (input
of a PC- soundcard), designed for modification of existing
AM- broadcast receivers to be able of DRM- receiving by use
of the softwaredecoder from Fraunhofer Institut für
Integrierte Schaltungen or other softwaredecoders.
Dimensions of the board 20x20x6,5mm. Oscillatorfrequenzy
eligible 467 KHz, 443 KHz or 10,712 MHz.
Product is in production.
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KD7RDZI2 Rating: 4/5 Sep 28, 2015 15:30 Send this review to a friend
Overly expensive but has advantages  Time owned: more than 12 months
I bought it in 2007, an era where Softrock was not a general coverage HF receiver yet. I have built a Softrock lite for 10.7Mhz for 21$ and a Funkamateur BX-053 for about 25$. To have a clean spectrum I had to put an isolating transformer Funkamateur BX-053 at the antenna input. Compared to the Softrock lite, the BX-053 is much easier to build and a snap to tune. The Universal DRM- miniature mixer unit is simply a downn-onverter to 12Khz. It does not have IQ outputs, just a single output so AN ORDINARY LOW COST OR BUILT-IN SOUNDCARD WITH MONO MICROPHONE IS ALL THAT IS NEEDED!!! Softrocks and BX053 need a stereo input! Conversely this unit will work well with whatever soundcard you have!!! It has nearly the same gain as the BX-053 a has maybe a little better sensitivity to the Softrock lite I built. The 10.7Mhz version comes with a 10.712Mhz crystal and is precisely tuned! It's exactly made to have a 12Khz center band. It is so small to put inside other receivers that have a 10Mhz IF. Actually I use it as an IF of single conversion HF receiver, in a way similar to a Elecraft K2, so put in front of the mixer an additional crystal filter wide enough to have 2 or 3 SSB signals, about 10khz. The filter serves to remove ANY image. If used to modify a receiver this additional filter may not be necessary because the receiver should already have an IF filter. The overall result I had using this filter is excellent. Yes it is very expensive for what it is. Would I buy it again at that high price? No, but I am happy I did it!
KD7RDZI2 Rating: 4/5 Dec 8, 2008 11:09 Send this review to a friend
it works well. Very expensive  Time owned: more than 12 months
I used it as an IF stage of a homebuilt sdr receiver. It works well. However, the unit is very expensive and to improve image rejection and crossmodulation issues I had to put a eight poles 10.7 crystal Filter at the input of the mixer.

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