I'm puzzled by this claim. I wouldn't call it a myth, but all the same... I grew up on a vineyard. Each harvest time the grapes would hang down heavily and almost touch the ground. Our pet dogs would park themselves…
AM is a type of modulation which is widely used by many different services (eg Shortwave broadcasting, CB radio, Aircraft VHF, etc). However "Longwave and Mediumwave Broadcast" unambiguously refers to that service.
Transmitters need only be re-certified if they are to be sold in quantity. Once-off Broadcast Transmitters need only demonstrate that they meet the relevant standards. Many of the existing LF and MF BC transmitters were…
It doesn't. In both it depends on what the stations engineer chooses to transmit.
Most cheap FM receivers definitely use a PLL to detect FM. Giving automatic tuning is just a side benifit.
Most FM receivers can lock on the carrier because they have a "Phase locked loop" to cancel any tuning errors. Many good AM receivers do exactly the same thing, especially those receivers which have "Synchronous…
Is commonly known as "Bass Boost". As the OP has said, it cannot give louder bass, but simulates the bass harmonics.
This is yet another myth: The "Woolyness" of AM broadcast (at least in America) is due to the stations purposefully tailoring their audio processing to suit typical cheap AM receivers. And this in turn is because…
Only while signals are strong. On weak signals however, AM has a considerable benefit in intelligibility over FM.
This is a myth. There is no reason that channel spacing need limit the modulation bandwidth. The only downside is that listeners to adjacent stations will hear a slight "monkey chatter" from the overlapping sidebands.…
Yes, this is one of the proposed methods. It's known as "Independent Sideband". It works, but it is a fairly expensive method to implement.
There were a number of successful AM stereo broadcasting methods proposed and trialed. These were completely compatible with conventional AM transmissions. The conceptually simplest of course whas where the LSB and USB…
There is no reason that the channel spacing need limit the sideband bandwidth. The only downside to this is that listeners on adjacent stations hear a slight "monkey chatter" from the overlapping sidebands. This is one…
The pickle will shunt (steal) some signal, but the radiated power from the antenna will be very much greater than that flowing through the pickle.
Because your nerves don't respond to high frequencies, you cannot "feel" RF current. What you do feel is the intense burning associated with the RF energy being converted to heat.
You have it backwards: Fessenden is famous for developing a electomechanical RF generator which put out a clean sinewave (eg a coherent wave), which helped replace the earlier Spark-Gap systems (which generated…
Or even simpler, use a Neon bulb. or even a Fluro light.
The alternative is to do the standard sitting exercises intended to avoid DVT. eg wiggle your toes, flex your leg muscles, rock your feet, etc. All you need do is avoid pinch points which block blood flow. These are…
There are simple exercises that you can do while seated to avoid DVT. Just wriggling your toes help a lot, or flexing the muscles in your legs. I fly a lot on routes over the tropics and have experienced serious…
Likewise "Pavane", an alternative history science fiction novel by British writer Keith Roberts.
Any Antenna designer wants to see the antenna being an elevated ground-plane or dipole mounted clear of obstructions well above the phone. However he is stuck with a compromise design and knows that there are various…
> antenna is tuned to the maximum allowed emission power per local regulations Actually it's not. The antenna is tuned to give a peak in output. It's either correctly tuned, or it's off tune. It's the design of the…
Different body positions are going to affect the antenna tuning differently. And of course different surroundings will also effect the directivity (eg the radiaton pattern). So some will give better results than others.…
A more likely theory is that the fob transmitter (and antenna) is tuned to put out max signal when near the body. This is it's normal use. If however you tested it with the fob somewhat isolated it would then be out of…
DC Currents also create magnetic fields. And neither type are a health hazard.
I'm puzzled by this claim. I wouldn't call it a myth, but all the same... I grew up on a vineyard. Each harvest time the grapes would hang down heavily and almost touch the ground. Our pet dogs would park themselves…
AM is a type of modulation which is widely used by many different services (eg Shortwave broadcasting, CB radio, Aircraft VHF, etc). However "Longwave and Mediumwave Broadcast" unambiguously refers to that service.
Transmitters need only be re-certified if they are to be sold in quantity. Once-off Broadcast Transmitters need only demonstrate that they meet the relevant standards. Many of the existing LF and MF BC transmitters were…
It doesn't. In both it depends on what the stations engineer chooses to transmit.
Most cheap FM receivers definitely use a PLL to detect FM. Giving automatic tuning is just a side benifit.
Most FM receivers can lock on the carrier because they have a "Phase locked loop" to cancel any tuning errors. Many good AM receivers do exactly the same thing, especially those receivers which have "Synchronous…
Is commonly known as "Bass Boost". As the OP has said, it cannot give louder bass, but simulates the bass harmonics.
This is yet another myth: The "Woolyness" of AM broadcast (at least in America) is due to the stations purposefully tailoring their audio processing to suit typical cheap AM receivers. And this in turn is because…
Only while signals are strong. On weak signals however, AM has a considerable benefit in intelligibility over FM.
This is a myth. There is no reason that channel spacing need limit the modulation bandwidth. The only downside is that listeners to adjacent stations will hear a slight "monkey chatter" from the overlapping sidebands.…
Yes, this is one of the proposed methods. It's known as "Independent Sideband". It works, but it is a fairly expensive method to implement.
There were a number of successful AM stereo broadcasting methods proposed and trialed. These were completely compatible with conventional AM transmissions. The conceptually simplest of course whas where the LSB and USB…
There is no reason that the channel spacing need limit the sideband bandwidth. The only downside to this is that listeners on adjacent stations hear a slight "monkey chatter" from the overlapping sidebands. This is one…
The pickle will shunt (steal) some signal, but the radiated power from the antenna will be very much greater than that flowing through the pickle.
Because your nerves don't respond to high frequencies, you cannot "feel" RF current. What you do feel is the intense burning associated with the RF energy being converted to heat.
You have it backwards: Fessenden is famous for developing a electomechanical RF generator which put out a clean sinewave (eg a coherent wave), which helped replace the earlier Spark-Gap systems (which generated…
Or even simpler, use a Neon bulb. or even a Fluro light.
The alternative is to do the standard sitting exercises intended to avoid DVT. eg wiggle your toes, flex your leg muscles, rock your feet, etc. All you need do is avoid pinch points which block blood flow. These are…
There are simple exercises that you can do while seated to avoid DVT. Just wriggling your toes help a lot, or flexing the muscles in your legs. I fly a lot on routes over the tropics and have experienced serious…
Likewise "Pavane", an alternative history science fiction novel by British writer Keith Roberts.
Any Antenna designer wants to see the antenna being an elevated ground-plane or dipole mounted clear of obstructions well above the phone. However he is stuck with a compromise design and knows that there are various…
> antenna is tuned to the maximum allowed emission power per local regulations Actually it's not. The antenna is tuned to give a peak in output. It's either correctly tuned, or it's off tune. It's the design of the…
Different body positions are going to affect the antenna tuning differently. And of course different surroundings will also effect the directivity (eg the radiaton pattern). So some will give better results than others.…
A more likely theory is that the fob transmitter (and antenna) is tuned to put out max signal when near the body. This is it's normal use. If however you tested it with the fob somewhat isolated it would then be out of…
DC Currents also create magnetic fields. And neither type are a health hazard.