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The component in question is called a variable or tunable inductor. The screw slot is in a ferrite material that cams in or out of the coil form as it is turned. The inductance varies according to the …

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 …

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 …

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. …

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. …

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 …

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 …

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 …

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. …

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 …

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 …

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 …

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 …

This is typically done with small relays that work well in an RF environment. …

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 …