As already said, it is a coaxial dielectric resonator, made of high dielectric constant ceramic material (typical value 38) to shrink dimensions. Its fundamental mode of operation is TEM and it is commonly used up to, say, 4 GHz. Major manufacturer were MURATA and TRANSTECH. Beyond, that frequency limit, you may prefer to choose a dielectric puck, resonating on the fundamental mode TE10delta. T8 is a varactor diode to tune the frequency and, based on the large tuning range and the constant tuning slope (MHz/V), I suspect a hyperabruct junction diode type. MACOM was an excellent manufacturer of varactor diodes. Back in the days I designed a lot of these VCOs, DROs etc, as building blocks of sophisticated multiloop frequency sinthesizers. Those were very creative times, when a piece of electronics art like that, was not readily available from China...regards from Italy.
Nice demonstration. You could build a small fm transmitter by modulating the input with an audio signal. It should even be fine, since you are in an ISM band, right? Another idea might be to show how a spectrum analyzer works by using the vco as a LO. put in a mixer, a bandpass filter, a power meter and an arduino and you have a simple spectrum analyzer to show the principle. Greetings, Michael
It is a good thing I live 2000+ miles away from the surplus store near you or I would be in trouble. A little trouble once in a while wouldn't hurt though.
Pretty simple, the resonant cavity+capacitor creates and LC oscillator. The capacitor includes a varactor diode (marked T8). that is a voltage dependant capacitor.
Do you have any recommendations for VCO's that generate sine waves and could be used to make a small CW transmitter for amateur use in the HF bands, say 1.8Mhz to 50 Mhz?? Great videos as always!
@@IMSAIGuy hi sir thanks for your reply if you increase the power to the oscillator would that then create rf noise that would interfere any other electrical devices around that frequency?
As already said, it is a coaxial dielectric resonator, made of high dielectric constant ceramic material (typical value 38) to shrink dimensions. Its fundamental mode of operation is TEM and it is commonly used up to, say, 4 GHz. Major manufacturer were MURATA and TRANSTECH. Beyond, that frequency limit, you may prefer to choose a dielectric puck, resonating on the fundamental mode TE10delta. T8 is a varactor diode to tune the frequency and, based on the large tuning range and the constant tuning slope (MHz/V), I suspect a hyperabruct junction diode type. MACOM was an excellent manufacturer of varactor diodes. Back in the days I designed a lot of these VCOs, DROs etc, as building blocks of sophisticated multiloop frequency sinthesizers. Those were very creative times, when a piece of electronics art like that, was not readily available from China...regards from Italy.
Nice demonstration.
You could build a small fm transmitter by modulating the input with an audio signal.
It should even be fine, since you are in an ISM band, right?
Another idea might be to show how a spectrum analyzer works by using the vco as a LO.
put in a mixer, a bandpass filter, a power meter and an arduino and you have a simple spectrum analyzer to show the principle.
Greetings,
Michael
Seems interesting, like these ideas.
That was very cool to see the inside how it works!
Good show! Enjoyed watching.
It is a good thing I live 2000+ miles away from the surplus store near you or I would be in trouble. A little trouble once in a while wouldn't hurt though.
Neat little device.
try to make a simple PLL circuit?
Nice video. Even though it has SMD components, the soldering looks like handwork, IMO.
Looks like that part can cover the high frequency LoRa bands all over the world which range from 863 to 928 MHz.
I'd love to see an 23CM band repeater or crossband repeater made from it ..
You didn't modulate it. Perhaps in your next video?
Wowowoow! Pretty cool. I wonder how this little fellow works
Pretty simple, the resonant cavity+capacitor creates and LC oscillator. The capacitor includes a varactor diode (marked T8). that is a voltage dependant capacitor.
Do you have any recommendations for VCO's that generate sine waves and could be used to make a small CW transmitter for amateur use in the HF bands, say 1.8Mhz to 50 Mhz?? Great videos as always!
AD9850 ruclips.net/video/ICVtN8KDebU/видео.html
@@IMSAIGuy Thanks I'll check it out!
@@IMSAIGuywhat about jamming drones?
As i recall your a HAM right?, Make a pair of simple HT's in the 902-928 band.
Hi this vid was great thanks I have a couple of questions about your vid please can you help me sir
ask
@@IMSAIGuy hi sir thanks for your reply if you increase the power to the oscillator would that then create rf noise that would interfere any other electrical devices around that frequency?