Johnythree

5 ms·

1.
by Johnythree 2y ago
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 beneath and gr
2.
by Johnythree 2y ago
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.
3.
by Johnythree 2y ago
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 effectively custom b
4.
by Johnythree 2y ago
It doesn't. In both it depends on what the stations engineer chooses to transmit.
5.
by Johnythree 2y ago
Most cheap FM receivers definitely use a PLL to detect FM. Giving automatic tuning is just a side benifit.
6.
by Johnythree 2y ago
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 Detectors&quo
7.
by Johnythree 2y ago
Is commonly known as "Bass Boost". As the OP has said, it cannot give louder bass, but simulates the bass harmonics.
8.
by Johnythree 2y ago
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 designers of chea
9.
by Johnythree 2y ago
Only while signals are strong. On weak signals however, AM has a considerable benefit in intelligibility over FM.
10.
by Johnythree 2y ago
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. In reality s
11.
by Johnythree 2y ago
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.
12.
by Johnythree 2y ago
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 are used as separate
13.
by Johnythree 2y ago
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 of many rea
14.
by Johnythree 2y ago
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.
15.
by Johnythree 2y ago
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.
16.
by Johnythree 2y ago
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 wide-band hash).
17.
by Johnythree 2y ago
Or even simpler, use a Neon bulb. or even a Fluro light.
18.
by Johnythree 2y ago
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 routinely taught to sold
19.
by Johnythree 2y ago
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 turbulence multiple times. T
20.
by Johnythree 2y ago
Likewise "Pavane", an alternative history science fiction novel by British writer Keith Roberts.
21.
by Johnythree 3y ago
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 effects that a nearby c
22.
by Johnythree 3y ago
> 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 wh
23.
by Johnythree 3y ago
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. Why is hard to under
24.
by Johnythree 3y ago
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 tune. eg in the
25.
by Johnythree 3y ago
DC Currents also create magnetic fields. And neither type are a health hazard.
26.
by Johnythree 3y ago
You would need to forget about any Radio Communications, eg Medium Wave Broadcast.
27.
by Johnythree 3y ago
Most grid-tie systems use multiple solar panels wired in series to give the high voltage DC needed to simplify the conversion to Mains AC.
28.
by Johnythree 3y ago
> Solar cells' output varies greatly, hence it needs to be DC/DC converted to a fix voltage to be of any use. This is simply wrong. It is true that modern MPPT solar regulators use PWM to extract the maximum power, but for year
29.
by Johnythree 3y ago
I bought my first set of Solar Panels 33 years ago. Those panels are still on the roof, have had zero maintenance, and are still happily running my small fridge. The Battery story is somewhat different. My first set of batteries finally die
30.
by Johnythree 3y ago
> Some places have interference but in situations where they work, they seem to be fairly well liked. But that is the problem.... Power-line networking both suffers FROM interference, and causes interference TO licensed services. When it

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