Friday, February 15, 2013

A new battery for the Yaege FC-1

I own a Yaege FC-1 frequency counter. It is around 4 years old, and recently I noticed its internal battery is dead: No more than 10 minutes of autonomy. The battery was a 18350 / CR123A, so it should be easy to find a new one.

But recently I have had bad experiences buying batteries at eBay: All the batteries I purchased were dead, with almost no capacity and very high internal resistance (in other words, useless), so I looked for a different solution.

Tuesday, February 12, 2013

ISS in Graves radar recording

From time to time, while recording Graves' signal with Spectran for meteor head echoes, strange things appear on the screen. Some of them are just "birdies" from the neighborhood, or noises from frequency inhibitors ( 142 - 144.5 MHz is deliberately interfered in some areas of Spain ). But sometimes I detect some "traces" in the spectrogram from unknown origin... until now.

Thursday, February 7, 2013

More eBay charger adventures: Now laptop chargers

A laptop power supply / charger bought in eBay. Worked fine for some months, but then started to work intermittently for some weeks, and one day BOOOM!