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Questions tagged [oscillator]

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27 questions
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0 answers
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I am picking up some low ssb somewhere I think on the 160meter band (1800 -2000 khz) on one of my homebrews. I can also pick up much higher ssb bands, but this low stuff I was concerned because I ...
Steve Rohe's user avatar
  • 1
1 vote
1 answer
164 views

Quartz oscillation is well known for its high Q-Factor and stable frequency. I have read many articles which say that amplifying such quartz oscillations should not be easy. I am not a licensed radio ...
user avatar
-6 votes
1 answer
273 views

So I am a hobbyist and I have in mind, a project I am working on and I need to sweep in a frequency range of 500 MHz with a step of 500Hz, and if my calculation is correct, this is equal to 1000000 ...
user avatar
-1 votes
1 answer
114 views

A band frequency is a range that start from a X frequency(lower one) to a Y frequency(higher one) but exactly and precisely how this is done i dont know how.i assume that the generator use a loop step ...
user avatar
4 votes
2 answers
2k views

I have decided to design a Medium Wave radio with discrete parts which won't include much complex ICs or schematics . I am thinking of designing the radio in Heterodyne mode. Which requires an ...
CoderBittu's user avatar
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4 votes
1 answer
350 views

I always thought of a GPSDO as only a precise frequency reference. But the GPS and other GNSS systems also deal with rather precise UTC/TAI-ish time! Are the outputs of any two GPSDO units generally ...
natevw - AF7TB's user avatar
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5 votes
4 answers
844 views

I have a Bodnar GPS disciplined oscillator, and I would like to inject its output into the antenna input to my HF rig. This will allow me to compare the frequency of received unknown signals to the ...
Bill KG5RMJ's user avatar
  • 85
1 vote
4 answers
661 views

This image shows how an AM wave is generated and emitted: This comment explains how 3 separate waves are sent at once to represent an AM wave: the transmitter does not transmit one pure sine wave at ...
Dan's user avatar
  • 311
2 votes
0 answers
359 views

I came across this VCO that uses a dielectric coaxial resonator, I understand how the resonator works, what I don't know is the oscillator topology, Colpitts, Clapp, et. Also I do not see any circuit ...
mpradio's user avatar
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6 votes
4 answers
1k views

It's my understanding that active superhet receivers can be detected by looking for the emissions from the local oscillator, particularly because the LO's frequency is usually set at some fixed offset ...
chrylis -cautiouslyoptimistic-'s user avatar
  • 282
5 votes
3 answers
546 views

I'm looking for a good tutorial about oscillator design (electronically) for transmitter. The problems with current tutorials are almost all provide only schematics, some explain how it works. But ...
RainerJ's user avatar
  • 151
2 votes
4 answers
2k views

I bought a FE-5650A rubidium standard reference from eBay in the hope I can readily use it: https://www.ebay.com/itm/142361240786 Unfortunately this is far from "reasily useable". First and ...
divB's user avatar
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1 vote
2 answers
222 views

I'm working on an old school VFO for the 15 meter band based on a JFET Hartley oscillator. The plan is to follow the oscillator section with a JFET buffer, then a CB amplifier (for increased reverse ...
Buck8pe's user avatar
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11 votes
1 answer
2k views

I recently watched, on You Tube, a NOVA program about the British school masters and students who were the first to publish the news that the Soviets had started launching satellites from a new launch ...
John Warren's user avatar
  • 213
6 votes
2 answers
2k views

When designing a resonant circuit, for example as a local oscillator, the product of $L$ and $C$ determine the resonant frequency according to $$f_{res} = \frac{1}{2\pi \sqrt{L C}}.$$ This means that ...
DK2AX's user avatar
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