[Premium-Rx] Hagenuk RX1001 and DRM reception

[Fabrizio Magrone]

Hello,

I'm testing my new Hagenuk RX1001M receiver. It has a 10 kHz IF 
output to connect a recorder, but I was wondering whether it could be 
used for DRM reception.

As you know, to listen to DRM broadcasts you need a 12 kHz output, 
usually downconverted from a 455 kHz IF, connected to your PC's 
soundcard; a software such as Dream then decodes the DRM signal.

The Hagenuk's 10 kHz IF is not too far from the 12 kHz baseband 
requested by the DRM decoder, so I connected the output to my 
soundcard, launched Dream and... well, yes, it works.

Thanks to the service manual kindly made available to the PremiumRX 
community, I had all the information I needed. The 10 kHz IF output 
is a 4-poles DIN socket; signal is available on pins 1 and 4 (the two 
lower pins in the socket).

I used a shielded two conductors wire: the two wires connected to 
pins 1 and 4, the shield to the receiver's case. You get a strong 
audio signals and the 10 kHz IF output must be set to a low level, at 
least in my setup.

I set the receiver to USB mode, with the widest selectivity available 
(6 kHz). I had to offset the frequency from 2.0 to 2.4 kHz lower than 
the transmitting frequency. For instance, Milano Siziano is 
transmitting on 693 kHz but I had to tune to 691.0 kHz; RTL is 
broadcasting on 6095 kHz but I had best decoding when tuning to 6092.6 kHz.

DRM reception isn't excellent: signals must be strong for good 
copying and you need careful tuning, probably because the 6 kHz 
selectivity is too narrow; I don't think that the 10 kHz IF output, 
instead of 12 kHz, is a problem. But if you have got a R1001 and you 
want to try to listen to DRM broadcasts, you can have a try.

73

Fabrizio