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Søren KjærsgaardAdding parallel circuit allows for the Lambda Diode to oscillate at a frequency determined by the LC resonance frequency. The result is an absolutely beautiful sine wave 🤩Note how the oscillation starts, once the supply voltage crosses where the current starts to decrease, ending up at the ‘negative resistance’ portion of its characteristic. This is likely the easiest and most clean oscillator I ever built 😃 I wonder if you can use a crystal or crystal f it would get damaged from the drive level 🤔 Maybe one of those vintage ones.. <a href="https://mastodon.radio/@va3db" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@va3db</a><a href="https://techhub.social/tags/signalsaturday" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#signalsaturday</a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronicsengineering</a> <a href="https://techhub.social/tags/siglent" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#siglent</a>

Søren KjærsgaardThe ‘Lambda Diode’ circuit, made from two J-FETs (one P- and one N-Channel) exhibits ‘negative resistance’ and has a ‘hysteresis’ curve when viewed on a curve tracer. A bit like a ‘tunnel diode’, actually. Circuits like these were a common way to make an oscillator from just a few components, as my next post will show. I always end up using my analogue <a href="https://techhub.social/tags/Hameg" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Hameg</a> scope for curve tracing in X-Y mode, it works a lot better than any of the digital scopes I have 🤷🏼‍♂️🙂 In fact, I have yet to experience a digital scope with even a half-decent X-Y mode.. Thanks for the inspiration <a href="https://mastodon.radio/@va3db" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@va3db</a> 🙂👍🏼<a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/keithley" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#keithley</a>

Søren KjærsgaardDecided to build a more permanent version of the ‘Coastal 20’ non-resonant multiband. I’m surprised how well it works 😃It’s not exactly meant for QRO, but that doesn’t matter, I’m mostly QRP, hardly ever above 10-20Watts. Can’t wait to play with 17 and 12m, it’s quite rare I visit those bands 🙂<a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/antennas" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#antennas</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/backyardfund" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#backyardfund</a> <a href="https://techhub.social/tags/rigexpert" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rigexpert</a>

Søren KjærsgaardSo when you have a bunch of jellybean JFETs (2N5457), time to burn, and a handful of 1uF bipolar capacitors… What to do.. 🤷🏼‍♂️🤓I decided to build a simple amplifier 😃 Although many find JFETs aren’t quite as intuitive as a regular BJTs, they’re not THAT scary 👻😂 and they’re easily biased, using a megaohm sized resistor from the gate to ground. To be able to do some more accurate calculations, I decided to measure the maximum drain current, IDSS, and the negative Gate-Source cut-off (pinch off) voltage, as they can vary significantly even between devices even from the same batch. A fun evening in the lab 😃<a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronicsengineering</a> <a href="https://techhub.social/tags/EE" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#EE</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a>

Søren KjærsgaardBack to basis, take 2: building a simple buffered oscillator 🙂As an instructor at a <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> get-your-license course, I needed to demonstrate an oscillator/buffer circuit and I also needed a decent excuse to bring forward the FET transistor..Well here we go 😃Have a nice weekend out there, and to all the hams, best 73. <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a>

Søren KjærsgaardUsing my new <a href="https://techhub.social/tags/rigexpert" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rigexpert</a> 🇺🇦AA-230 analyzer to measure the cable loss of a brand new 50ft spool of <a href="https://techhub.social/tags/messiandpaoloni" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#messiandpaoloni</a> POTA-FLEX-7 <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/antenna" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#antenna</a> cable - can’t wait to use it for some /P ops 🙂Today the weather is horrible, rain and wind, so it’ll have to wait ☺️<a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/hamradiooperator" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradiooperator</a>

Søren KjærsgaardDo you still remember how to design and build a simple transistor amplifier? “Transistors today are mainly being used for switching applications, everyone are using op-amps for signal conditioning” …-is what I recently heard someone say at lunch.. And while there’s some truth to this, occasionally a simple transistor amplifier may find its justification 🙂Currently an instructor at a <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> license course, I built this simple circuit: it’s perfect to demonstrate simple biasing and it’s easy to test 🙂 <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a>

Søren KjærsgaardDecided to test some cheap SMA terminators from 1-4GHz and surely, you get what you pay for 🤷🏼‍♂️🙂Still, at $2 a piece, a return loss (RL) just above 20dB until 1 GHz isn’t too bad. The Huber-Suhner terminators are much better, even the BNC version, but obviously also comes at a much higher cost.I calibrated the VNA with the Huber-Suhner termination, in order to be able to measure the terminator from the calibration kit in comparison 🙂<a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/rfdesigner" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfdesigner</a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a>

Søren KjærsgaardI need a reasonably clean 4MHz oscillator for a <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/foxhunt" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#foxhunt</a> offset attenuator and decided to build one based on a J310 J-FET transistor. The output on the Drain is quite clean, but can’t be loaded much, so a I added a simple buffer based on BC547B 🙂It’s all pretty standard circuitry, and you can find all kinds of variants out there, but it’s still fun to see it spring to life 😃<a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronicsengineering</a> <a href="https://techhub.social/tags/siglent" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#siglent</a>

Søren KjærsgaardDon’t you just love it when vintage RF electronics springs back to life? 😃My old fox hunt receiver, original design by <a href="https://techhub.social/tags/OZ1FSM" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#OZ1FSM</a>, has survived a couple of relocations, but the batteries had leaked and it looked like a complete loss, unfortunately. A couple hours of careful cleaning did the trick however, and now it’s back, alive and well with new battery holders and a couple of Lithium’s 😃<a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/foxhunt" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#foxhunt</a> <a href="https://techhub.social/tags/RFengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RFengineer</a> <a href="https://techhub.social/tags/RFengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RFengineering</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a>

Søren KjærsgaardSpiral antennas are funny devices. They are known for their extremely wide bandwidth, the ones shown here, are specified to operate from 2-18GHz. They’re not meant as transmitting antennas, these critters are receive-only, used by (largely non-civilian) pilots who have those needs ☺️Their low frequency boundary is determined by its physical size, in this case, the circumference of the small plate where you can see the fine spiral traces. Once you cross below that boundary, the structure basically collapses electrically, seen here as a steep SWR ‘wall’ to the left side of the sweep. At this point it’s not an antenna anymore, but something else (whatever that is 🤷🏼‍♂️😂)<a href="https://techhub.social/tags/rfengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineering</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/antennaengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#antennaengineering</a> <a href="https://techhub.social/tags/emso" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#emso</a>

Søren KjærsgaardTesting a new 1:9 Unun I plan to use for a permanent non-resonant multiband vertical 🙂 <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/measurementmonday" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#measurementmonday</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/rfengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineering</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a> <a href="https://techhub.social/tags/hamradiooperator" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradiooperator</a>

Søren KjærsgaardIn November 2023, I experimented with directional finding using a ‘rat race’ 4 port coupler. The coupler outputs deliver the sum and difference of the received signals from the two antennas and at the difference (‘DELTA’) output, a reasonably sharp signal ‘null’ is present exactly between the antennas.In principal this should also be doable by comparing the RSSI (signal strength) between two completely similar receiver chains. Using two AD8317, wideband demodulating logarithmic amplifiers and two antennas, the DC voltage on the output can be displayed on the oscilloscope (yellow and blue trace), and more importantly, the difference (‘DELTA’) between them (red trace). Moving an RF source in front of the antennas, it’s clear that the DELTA signal drops when the source is right between them, and rises again towards the edges. RF filtering will be needed to limit the AD8317 10GHz bandwidth 🙂<a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/rohdeschwarz" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rohdeschwarz</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/rfengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineering</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/emso" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#emso</a>

Søren Kjærsgaard2/2)I decided to test it with a 0dBm RF source through an isolator and it clearly reacts to the small amount of applied power, moving from 2480 Ohm down to 2438 Ohm. Any suggestions for more experiments? 🙂<a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/rfengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineering</a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/sensorsunday" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sensorsunday</a>

Søren Kjærsgaard1/2) A fellow <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> operator and electronics enthusiast brought me a vintage X-Band power sensor, thanks OZ1ETE 🙂It has a super sensitive NTC Thermistor, a tiny spherical bead, encapsulated inside a small glass tube. It’s by far the most sensitive Thermistor I’ve ever seen, just holding your hand in front of the waveguide flange, not actually covering it, will make it change slightly. <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/rfengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineering</a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/sensorsunday" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sensorsunday</a>

Søren KjærsgaardAny experience with this attenuator? I’ve been considering it for a while .. 🙂🙂 <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a>

Søren KjærsgaardMy first <a href="https://techhub.social/tags/HB9CV" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#HB9CV</a> <a href="https://techhub.social/tags/antenna" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#antenna</a>, believe it or not, made from 5mm brake lines and a foot of 15mm copper pipe 🙂I need it for a 70cm radio <a href="https://techhub.social/tags/foxhunt" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#foxhunt</a> event in a couple days - looked different places for design guidelines, some of them came up with quite different results 🤷🏼‍♂️🤨Decided to just have go at it, based on a combination of what I could find in the legendary <a href="https://techhub.social/tags/Rothammel" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Rothammel</a> antenna book and some online sources and it turned out quite well 😃Resonance is a bit low, 431MHz, but it’ll do fine as a direction finding device: what I really want is the characteristic kidney shaped radiation pattern, allowing me to turn the antenna backwards, looking for a minimum in the received signal. Funny to see how the <a href="https://techhub.social/tags/smithchart" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#smithchart</a> impedance plot has a distinct turn at the resonance frequency 🤓<a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/antennadesign" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#antennadesign</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronicsengineering</a>

Søren KjærsgaardBeen debating a loooong time whether to get the SV4401A 4.4GHz VNA.. I already have a 4GHz NanoVNA, but the display size, ruggedness and N-connectors on the 4401 is a major upgrade.. Well, I took the leap! 😃And why not make the first-light ‘Hello, World’ test a fun one ☺️ I came across an AT-741 aircraft IFF transponder antenna and it seems like it still works 🙂Still in production by several vendors (fx Harris), the unit I have is old, dated 08/1979. So much more fun to have it sense a bit of RF so many years down the road 👍🏼<a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/measurementmonday" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#measurementmonday</a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronics</a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronicsengineering</a>

Søren KjærsgaardAnother one of those “it’s me or the dumpster” finds… There’s really no civil applications in Ku band, or? Inspire me, please ☺️ If only I had a 17ish GHz oscillator, I could at least play a bit with it 🙂 <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a>

Søren KjærsgaardYay! 😀 The 432A power meter works just fine and I managed to scavenge some probes and the needed connection cable - my first calibrated power meter ever 🙂What a beautiful addition to my little lab 🥳🎄I have more probes and together they cover all the way to 18GHz 👍🏼<a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamradio</a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hamr</a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rfengineer</a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#testandmeasurement</a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#electronicsengineering</a>

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