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Results tagged with rf
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user 149547
Short for Radio Frequency, i.e. frequencies at which radiation (intentional or not) plays a role. Typically associated with wireless communications, but also relevant for high-speed PCB design.
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Question about the length of antenna
The efficiency is primarily determined by the RF resistance of the conductor (due to skin depth and connection losses) and ground losses due to proximity to the ground (depending upon the orientation of …
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Circuit Component for Amplifying Transmitted RF Signal?
If the radio link is one-way, then a power amplifier on the transmitter is generally better than a preamplifier on the receiver as a preamplifier will add noise to the received signal.
In general, a …
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Near field antenna for 0.3-100MHz
This is typically done with small relays that work well in an RF environment. …
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2
votes
Accepted
Why does my GPS and Wi-Fi work inside a sealed copper clad box?
Failing this, RF can easily couple from the largely isolated plane of the lid to the internal electronics.
Also don't overlook the large opening you have on the side of the enclosure. …
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Clone garage door opener
Depending upon the sophistication of the remote control, it can involve rotating control codes to prevent replay attacks.
While I, like many, enjoy a good engineering challenge, I am sure the time in …
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1
vote
Powering a RF433 transmitter with 12V
It sounds like you may have reversed the supply connection to your proto board. I don't know if this is possible but getting the data line to melt would require something as extraordinary as that. Or …
- 5,594
1
vote
Accepted
Minimum distance between inductor beads and an RF transceiver?
The purpose of the beads is to keep common mode RF current off of the control lines.
The first line of defense is to place the beads at the transmitter end. …
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2
votes
Can 2.4GHz antenna radiate through a small enough enclosure opening?
I would consider mounting the A20737A BT module on the bottom side of your top PCB. Follow the datasheet instructions for the clear of copper area on all layers of the top PCB. Then test the antenna p …
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2
votes
antenna to transmit the broadband signal around 100MHz
If you mean that the RF signal must be concentrated within that volume then you must supply more application details before a solution can be proposed. A drawing would also then be helpful. …
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2
votes
Simulate bad cell phone reception in the lab
Some possibilities:
Connect the antenna to a dummy load
Use a step attenuator between the antenna and the radio using double shielded coax
Conduct your experiments in a shielded room / enclosure
N …
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vote
Minimising interferences caused by switching low current
It is doubtful that it would directly interfere at 2.4 GHz but there are subsystems such as local oscillators, IF chains, etc. that could be affected.
Follow the spec sheet for the switcher with rega …
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1
vote
Accepted
20 Mhz AM transmitter and receiver - Receiver does not receive
In your text you describe this as a 20 MHz transmitter but the original design is for a 27 MHz transmitter and receiver. If you have attempted to alter the design, it would be helpful for you to descr …
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Multilateration with TOA using lowcost transceivers (like NRF24L01) and uCs
The basic problem with your formula is that tb has nothing to do with the time of flight. The start of the transmitted bit arrives at the receiver delayed only by the speed of light, not by the bit ti …
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1
vote
Is it important to consider channel bandwidth of the signal to measure cable path loss for R...
If you view the cable as a transmission line, you can model all of its characteristics using standard transmission line formulas. This suggests that single frequency tests at the spectrum limits shoul …
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Is the Friis Formula outdated?
The notion of applying fixed boundary sphere gains to the Friis equation will not work without other significant adjustments to the Friis formula. By fixing the length of the antennas, the directivity …
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