Posts by PE1RAH

Hi Andreas,

These are fully allowed for indoor use, and even well known companies like Bosch have these kind of motions sensors for sale.

I looked it up, you can find the FCC regulation about it in the link below:

https://www.ecfr.gov/current/t…828339709e/section-15.245

The problem happens when a building full off those sensors are in the azimuth direction off the antenna beam. I have confirmed the source by changing the antenna direction and I also didn't believe it in the beginning. I spend quite some time trying to find the cause off "LNB oscillations", but later figured out it was actually comming from a 10.525GHz source from a nearby office building. After analyzing the signal pattern and searched the internet I figured out the existance off those microwave motion detectors. Even when the leakage is small, it is still more powerfull than the QO-100 downlink signal and slightly overloading the high gain IF stage causing problems with receiving.

With kind regards,

73,

William Leijenaar

Hi AMSATs,

I have notice that at some urban locations there can be a strong interference at the 10 GHz downlink from what I believe X-band motion detectors. This happens for example at my office in Nijmegen, while in my hometown the same setup has crystal clear downlink signals.

I just wonder if there are more amateurs with this problem as I get feedback from amateurs in urban locations that have similar experiences. I wonder if anything can be done against it, because those motion detectors are extremely close at 10.525 GHz.

Below I put a link of an example motion detector:

https://www.active-robots.com/x-band-motion-detector.html

Kind regards,

73,

William Leijenaar PE1RAH

Dear AMSATs,

After my presentation at the AMSAT-DL symposium I got a lot off positive feedback and requests for more information and its availability. For the information part I update the product website, where you can also find the manual that explains the system in more detail and its use.

Please have a look at:

https://www.leijenaarelectronics.nl/le016-r5

More samples will become available soon, still work in progress

Parts availability is nowadays another big challenge.

Wish you all a lot of fun on the QO-100 transponders,

73, de PE1RAH

William Leijenaar

Guten abend,

Ich uberlege dieses Jahr zum AMSAT-DL Symposium zu kommen aber habe noch einige fragen.

Ich habe die doppelte Impfung erhalten aber bin mir nicht sicher ob der niederlandische Impfbrief ausreichend ist um Zugang zu erhalten.

Ausserdem mochte ich mein LE016-R5 QO-100 transverter Design mitbringen. Wenn moglich kann ich eine Vorfuhrung geben. Ich bin mir aber nicht sicher ob man irgendwo (draussen) einen QO-100 funkstation aufbauen darf.

73, William Leijenaar PE1RAH

Hi AMSATs,

Via this way I like to inform you about my latest QO-100 transverter design called LE016-R5

It is a true transverter, meaning a receive-downconverter AND transmit-upconverter (inc. 4W PA) in the same box.

It is housed in a 93mm x 93mm x 25mm milled aluminium box, and is intended to be mount close to the dish feed.

It is the work of almost one year spending some free time to improve the design to what it is now.

At the moment I only have a demo model that I tested for several weeks, and I am finally happy about it

I don't have units for sale available, but working on it. I am now working on the manufacturability part of the project.

On my website I put some pictures and information about the transverter, included a short demonstration video.

Please have a look at: https://leijenaarelectronics.nl/

More info to come,

73 de PE1RAH,

William Leijenaar

PS: Does anyone know a place where I can have an aluminium casing milled for a reasonable price ?