JUMA-RX1 modified for DRM reception
We have been asked if JUMA-RX1 can be used for DRM reception. Matti oh7sv quickly simulated broad DRM filter for JUMA-RX1 and I made a test setup. Except modified JUMA-RX1 you also need PC with sound card and DRM program.
DRM background information and more links can be found here:http://www.drm.org/
Main JUMA-RX1 modification is broad (10kHz) filter for DRM reception. With standard RX software you must tune 12kHz bellow desired DRM station center frequency. In other words your DRM station signal will be down converted toIF frequency between 7-17kHz. This low IF frequency is then fed to DRM program via PC sound card. If you need to avoid some narrow spectrum interference you can use as well other than 12kHz center frequency as long as your IF signal passes filters and stays within sound card input limits.
JUMA-RX1 DRM filter modifications
Simulated DRM filter response
Modified main board
JUMA-RX1 DRM receiver
RX Sound sample
Full schematic & other details can be found fromJUMA-RX1 main www site