tipok's blog

Low power DRM+ receiver implementation ideas

Introduction

This is a list of ideas for creation of DRM+ receiver on low-cost component base that will utilize minimal power to be ready for making pocket receiver.

 

Trimble/Symmetricom UCCM GPS Receiver 50-pin connector pinouts and protocol reverse-engineering

Introduction

This page describes the pinouts of 50-pin connector, avaliable at "Trimble 57963-C" and "Symmetricom UCCM 089-03861-02" boards, which can be bought on Ebay. They have no direct NMEA support, but have own binary protocol and additional signals, that avaliable on this connector. This receivers are used for DAB SFN operation as alternative for Ublox-LEA-M8F. The main reason of this work - is to receive UTC time from it and get the flags to find that receiver is ready to provide stable 10MHz and 1PPS signals.

 

 

 

Single Frequency Network DAB trials progress using EasyDABv2 boards with GPS disciplined oscillators

 Introduction

This page describes steps needed to run EasyDABv2 board in synchronized network mode. This mode allows boradcasters to extend transmission range of DAB multiplex by adding more transmitters to the network but not adding new frequencies due all transmitters are using same frequency and increases area of same nearby transmitter.

Updated 10.10.2016

 

 

EasyFM FPGA FM stereo modulator with RDS and live stream MP3/WAV decoder

Introduction

This page describes hardware/software for stand-alone FM broadcast modulator with RDS. The hadware is based on EasyDABv2, and no any modification is needed (in case if Low-Pass filter is used in output). If You have LFCN-225+ filter, you don't need any modifications and you only need to update board's firmware to switch into FM modulator. If Your filter - is RBP-204+, then broadcasting on FM band is not possibe, filter replacement to low-pass is needed. With this board and firmware You can broadcast on 88-108 MHz band as usual FM station.

 

 

 

 

 

Using EasyDABv2 hardware as direct sampling transmitter with GnuRadio for producing FM or DRM+ signals

 fm or drm     Introduciton

So, can EasyDABv2 be used to send GnuRadio quadrature signals to the air? For sure Yes, it can!

With simply modified firmware, with removed DAB-blocks, this hardware  is turning into the EasyQDUC (Easy Quadrature Digital Up Converter). And it can be used to send any signal with 192KHz quadratude samplerate or lower. For example, it can be used as DRM or DRM+ transmitter, FM-radio station or any other signal transmitter that fits into ~182 KHz bandwidth.

 

 

EasyDABv2 measurements results

 3 months are gone after release of EasyDABv2 hardware. It's time to publish some measurements and enchancements for this hardware. Here is short way of enchancing output signal.

FPGA DAB modulator with ethernet interface

 No more modulation process on PC. All modulation is done inside FPGA!

More info on it's EasyDABv2 page.

New FPGA-based USB DAB modulator (EasyDABv1) - is created!

New DAB modulator design! No more CPU-intensive job. EasyDABv1 with USB interface.

 More info at the device's page.

 

 

 

Amiko Alien2 Enigma2 BOOT problem

amiko bootAfter Amiko Alien2 bought, I tried to install AR-P image of Enigma2/PLI. But unfortunaly there was a problem with flash IC and bootloader.

 I able to boot only SPARK image, and even if I choose boot from enigma [ENIG] that i wrote to flash - tuner can't boot to it.
 

 

 

 

 

 

 

 

Just small notes about GNURadio

 

If old modules used, there may be error, like this:

 

/usr/local/include/gnuradio/swig/gnuradio.i:31: Error: Unable to find 'gruel_common.i'
/usr/local/include/gnuradio/swig/gr_basic_block.i:26: Error: Unable to find 'pmt_swig.i'

Fix for this fund on maillist: http://lists.gnu.org/archive/html/discuss-gnuradio/2012-04/msg00355.html

And patch is simple:

 

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