Questions tagged [radio]
Radio is the technology of signaling and communicating using radio waves. Consider using the rf (radio frequency) tag.
1,053 questions
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Can a magnetic loop antenna be used to communicate through a perfect metal container?
I understand that in the near field of a loop antenna the magnetic field dominates, before it has formed a radiative propagating EM wave. Based on this, and the fact that magnetic fields can penetrate ...
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Choice of PCB Material for HF RF circuit
I am currently designing an FM Radio (88MHz - 108MHz) and have gotten to a point in the design where I am beginning the layout plan / make some general design decisions about manufacturing.
I plan to ...
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RF test connector signal leakage
I'm trying to quantify Wi-Fi throughput of a link consisting of two devices. One of the methods is connecting the devices using standard test connectors MM8030-2610RJ3, a coaxial conductor and a ...
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Unexpected Noise Floor Behavior on S2LP Receiver – Need Help Understanding
I’m currently developing a handheld device using the S2LP as an RF transceiver, and I’ve run into something I can’t quite explain about the noise floor during receive mode.
Here’s the noise floor the ...
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Identification of damaged diode in Crosley radio [closed]
My house was struck by lightning and fried my Crosley radio. This is the only broken part on the main board. I can't read the number on it. Does anyone have any idea what this is? I know how to solder ...
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Choice of LO for Gilbert cell mixer and ADC sampling
I am making my own superheterodyne radio for receiving FM broadcast radio, and I want to be able to use an ADC for sampling and processing. The ADC's available on the market are quite pricy at the ...
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Multitech xDot ABP not working after factory reset [closed]
I've recently been working with Multitech's MTXDOT A00-1 LoraWAN modules along with my RAKWireless WisGate Edge Lite 2 And I've noticed an issue with Multitech's modules: The modules connect to the ...
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nRF24L01+ Communication Issues
I am trying to communicate between 2 nRF24L01+ and am using 2 Raspberry Pi Pico's to control them. Below is my code, schematic, and the datasheet. My problem is that the transmitter always prints <...
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Can MIMO function properly if RF radios are connected to an RF transceiver via coaxial cables?
My team is developing a simulator to test how degraded RF network conditions affect our Silvus MANET radios. We have a JFW RF Transceiver which acts as a sort of hub, and allows us to connect each ...
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Use of bit stuffing, NRZI, and scrambling together
I'm designing a communications protocol on top of a GFSK modulation with two symbols.
Another protocol that is used with the same equipment encodes the packet payloads using bit-stuffing, then NRZI ...
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What does an FM module do, and why doesn't an AM radio need some sort of equivalent?
I built an AM crystal radio, and what I loved about the project was that it wasn't rote assembly; as I put it together I learned what every part did. And given it was such a simple thing, I learned ...
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Deviation of length of antenna from best effieciency
Suppose I have a antenna and the wavelength of the wave which gets transmitted is 0.5m.The optimal length of the antenna for transmission is 0.5/2 = 0.25m.Suppose now that I buy wire from my local ...
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DIY Fireworks Firing Controller - Issues Upgrading Design from RFM69 LoRa RFM95 Radio
I have an existing design for a wireless fireworks firing system (remote and field module) that use RFM69HCW packet radio(s) @ 915MHz to transmit wireless commands to each other. I recently upgraded ...
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Protecting against GPS jamming via directional antenna
The repeated GPS jamming and spoofing around Russia's western territories has hit the news again. I can't help but wonder why it is so effective.
It is my understanding that a GPS signal always comes ...
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What RF connector is this?
I need help finding the PN for these Mating RF connectors. What manufacturer is it and what is the PN?
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