21 January 2020

Arduino Nano has no INPUT_PULLUP on A6 and A7

›
I discovered it the hard way: Arduino Nano has no INPUT_PULLUP on A6 and A7 . That's because the ATmega328 in tiny SMD package has two e...
14 January 2020

Voltage multiplier

›
It is all right at IK1ZYW's Labs, it's just that I had no opportunity to update the blog. Last experiment has been a voltage multi...
09 November 2019

Another tool for planning LOS contacts

›
Following a previous post on tool for planning microwave (outdoor) activity , I would like to add a web service that eases the search of two...
07 November 2019

Not all CDM324 are created equal

›
Since there is probably no way to use my three specimens of CDM-324 24 GHz radars, I decided to open one of them. Remember there is a well ...
06 November 2019

AS-IS CDM324 is unsuitable for 24 GHz QSO

›
I tried receiving the 24 GHz signal at 4 metres distance pure line-of-sight inside a room. The receiving end IF port was sent to an RTL-SDR ...
04 November 2019

Modulation through IF port on CDM324

›
Since the frequency difference of a couple of my modules falls within my SA/TV-test-set receive range, I could try WBFM modulation. I used t...
03 November 2019

First check with CDM324 couples

›
As I did on 10 GHz back in Spring 2017, I checked the frequency difference between my 3x CDM324 modules. Currently I have no means to measur...
02 November 2019

Size of CDM324 vs HB100

›
Three CDM324 24 GHz radars have arrived. This is the size comparison vs the 10 GHz counterpart HB100: The CDM324 has no holes for attac...