Monday, 1 October 2007

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

Saturday, 8 September 2007

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.

Thursday, 6 September 2007

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.