22 March 2019

HB-100 vs Voltage

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Having built a DFCW modulator for the HB-100 controlling the operating voltage, I could observe that a difference of +130 mV in the suppl...
21 March 2019

HB-100 vs Temperature

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My simple observation of a single HB-100 module is that the frequency increases as temperature decreases .  I think it has gained 150 k...
15 March 2019

There is life on 10 GHz around here

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I am really excited: I received HAM signals on 10 GHz! I needed to add a T-bias to my RTL-SDR box and the longest part was drilling a hole...
14 March 2019

Finally measuring the frequency of my HB-100's

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Yesterday I wired up the LNB to a TV-spectrum analyzer to check that the preliminary setup would work. Besides an occasional short into the...
13 March 2019

Returning to 10 GHz

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I am again doing something at 10 GHz. During the journey to Montichiari HAM fair, fellow Pino JNS showed us how easy it is to receive t...
01 March 2019

Thinking out of the box Telecommunication test for millennials in IT

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I've just done this at work, using some tricks that were daily routine back in the days of dialup. I wonder how a sysadmin half of my...
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25 February 2019

GPS Week Number Roll Over, 2019 edition

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I discovered this detail of GPS raw signal in 2010, when my Garmin Geko 201 showed a wrong date . The guys behind GPS (not Garmin) impleme...
15 February 2019

Weird behavior of ZS-042 RTC modules (DS3231)

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First of all: all these ZS-042 RTC modules were paid about 1 USD each and come from not-certified sources.  One night I decided to meas...