ED1YAZ coverage

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ED1YAZ on the air

The last Saturday, April 17, a crew from URLE installed the RV54 repeater of Leon.

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Mast pedestal for car wheel

With thanks to EB1FAB's father for welding

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Amateur radio repeaters in Spain and Portugal

Every time I need to know if there is a repeater in some place in Iberian Peninsula it becomes a nightmare for me to find the right info, so with these link I hope to solve my problems and yours.

Spain: VHF repeaters UHF repeaters

Portugal: Repeater list

Visit to radio fair in Moscavide

Last Sunday, November 15th, I was in Lisbon so I visited Moscavide's radio fair, organized by ARVM.

Me at fair

By the way, I met Tiégui CT2JTZ over there

YO3IBW receives DRM with the converter

YO3IBW has been able to build my converter and run it with a TS-850S.
Read this page of comments about main article in converter to learn how to apply right the circuit to the 850.
Have a look to the video recorded by YO3IBW

VHF radio from Camperona Mount

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The car and fire watchman's house on background

The car and the antennas

Close-up of the moxon antenna

QSO with CT2JTZ

Visit to CT

Last thursday I received a phone call from EA1DK, Fernado told me he had been QSOing with CT2JTZ Thierry who is Telecomunication Engineer(like me) is keen on mirandese language(me in leonese, both are same languages with different local names)
It was a big coincidence because I had planned to travel to Braganza next day just few km away from Thierry, so I decided to find out info about him and visited him.
I arrived Thierry's town on Friday afternoon and I met him! He was surprised for the visit. We spent a nice Friday with him, he show us his town, the petroglyphs, even invite us for dinner at his home(tks to his mother)
Next day 22 I hope to visit him again.
Here is a photo from my visit:


Why I use the CT7 prefix?, read this

DL8BEG reproduces EA1GHE`s downconverter

I have received an e-mail from Werner(DL8BEG) who successfully reproduced the downconverter that I designed to receive DRM with the kenwood TS-450S radio.
Werner found a mistake I made in the drawings(now corrected):

Thanks to Werner for his correction.
This is a photo from his circuit:

Recycled ferrite sleeves from the rubbish

There is one cheap way to get ferrite sleeves for EMI troubles. Get the sleeves from old computer screen cables. Just use a knife and extract out the ferrites.

Receiving DRM with Kenwood TS-450S (II)

For those who are interested in receiving the DRM using the TS450 radio by Kenwood, here is a pdf file with the details and circuit. Remember it's also valid for TS690, TS850 and TS950 radios wich has 4th IF output at 36.891KHz for use with optional DSP-100.
I am waiting for any feedback.
73!
Here is a demo video:

RF interference from Sony TV set

I had a Sony TV set model KV-14M1E. Every time it was turned on(even in stand-by mode) I received an annoying QRM from it in my amateur radio. Since I know that the interference came by radiation one day I decided to open the TV and explored the circuit with a small loop probe. You can see how I did it in the next video:



I discovered two loops radiating RF:


Like a solution I was thinking about decoupling these loops with the right capacitor but I had got no time to do the modification, the TV set was taken away from my QTH.
Now my spectrum is clear, more or less, of human-made QRM.

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.