Receiving the Digital Radio Mondiale with Kenwood TS-450S and series

The TS-450S radio and related series(TS-850, TS-690) has a connector in rear panel labelled as DSP2. This connector was original used to supply the 4th IF to optional DSP-100. This signal has a frequency of 36.891 KHz, so with a simple converter it can be moved to 12KHz, then sampled with a computer's soundcard and processed with any SDR software.

I use this signal to receive the Digital Radio Mondiale with Dream Software.

I made a prototype converter, based on a double balanced mixer. Now I am working in a more sophisticated mixer with less intermodulation and higher SNR.

The prototype

Yaesu YHA-63 antenna

This is the data taken with a network analyzer from the Yaesu YHA-63 antenna. This antenna come with the FT-817 package and in my opinion is a good dummy load.

S11 parameter of long version


SWR parameter


Results of the short version are the same without the 50MHz band.

Blog created

Hello all and wellcome to my blog in the net. I am EA1GHE amateur radio from Spain.
With this blog I will try to publish articles concerning amateur radio, specially technical ones.
I hope you like it.

Teleno mount(2188 m), near to my QTH.