For my Outdoor QRP operation I already have several antenna’s but missing in my box are dipoles. So I decided to build a small little dipole box. It’s a real quick and dirty construction. The pictures will say it all: It’s just a box with a bnc and 2 bolts. In the first picture I used the wrong type, so I replaced them. The end result. It also has a little hook on top to hang […]
For this year we have a vacation planned to Luxembourg. So first thing to do is to find out what i am allowed to do with my CEPT Novice licence. One of the latest documents i found is this one: http://laru.lu/images/documents/amateur-radio-bandplan-LX.pdf From this see 2 interesting bands that I can’t work from home. The 15m and the 80m. So knowing this it’s time to prepare my field kit for QRP ops in Luxembourg. What i need: Good […]
As you can see on my site I’m building a lot of little tools that can help me out in the shack. While browsing AliExpress i ran in to an nice little power measuring module based on the AD8307. I decided to buy one and see if it would do the job. After a few weeks I got this little module. So now starts the building. I decided to use a Arduino Nano for the calculations, […]
I build this just because i wanted a quick and easy project to kill some time. I found the schematics online (PH2LB and Here). All the necessary parts i had laying around. In the end it looked like this: It give a fair a mound of “Noise” according to my scope. I have put it in a little enclosure, also i tried it on my frequency counter. It seams to resonate around the 1.7 […]
This weekend I reorganized the shelf to fit my measurement tools.
In the januari 2017 number of Razzies there was an article about a lightning receiver. They started with an basic receiver, but later changed to a pre-build module with more capabilities. My interest wen’t to the basic receiver, simply because, like many of my little projects, its all made up around component that many of us have laying around. So I build the little receiver, only to discover i ran out of standard coils of 1mH […]
Today i received a nice little package. Inside was a Pi-Hat for LoRa. Specifications Lora Spec 168 dB maximum link budget. +20 dBm – 100 mW constant RF output vs. +14 dBm high efficiency PA. Programmable bit rate up to 300 kbps. High sensitivity: down to -148 dBm. Bullet-proof front end: IIP3 = -12.5 dBm. Excellent blocking immunity. Low RX current of 10.3 mA, 200 nA register retention. Fully […]
The idea I have some old server power supplies laying around with the intention to convert them in to a good power source for my HAM stuff. The base will be and DSP-600 from HP, capable of producing 47Amps on 12v. With some tweaking it can produce 13.8V, Also it has a 5V. Always handy for testing purposes. What is needed So here are the basic ingredients: […]
I have had the parts laying around for a while and with the arrival of the 2U high 19 inch chassis it was time to put it all together. A 12V (13,4 actually) power supply for in my rack. Some specs: DV voltage : 13,4 Volts ( i can’t up the voltage more on the 12v supply) DC Current: 12,5 Amps ( all tho it will be fused at 10 Amps.) AC voltage : 230V […]
In september hebben we weer een water weekend gehad, we hebben wat mooie foto’s gemaakt van de 3 boten op het water. Deze wilde ik toch ff delen.