Subarrier FM radio

Are such radios sold in the USA via the internet? Is the station really
"fixed"? Someone gave my uncle a radio which is said to have a special
"chip" that receives a Greek radio station. He mentioned to me that years ago
he had another one that suddenly switched to a Philipine station and he gave
it to a Filipino colleague. Amazon and Alibaba have such Metrosonix radios
but not station specific, but also do not seem to allow being sold in the
USA. THe search terms I used were <SCA FM radio>.

- = -
Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
http://www.panix.com/~vjp2/vasos.htm
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
[Homeland Security means private firearms not lazy obstructive guards]
[Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]

 

"SCA sub-carriers never went above
about 80Khz, so there was no increase in occupied bandwidth. IBOC
changed all that by grabbing all the spectrum between +/-100kHz and
+/-200KHz: "

But bear in mind there were adverse implications. When it was simple "store cast allocation" it was at 76 KHz, locked to the 19 KHz stereo pilot. The deviation was very low and did not produce much in the way of sidebands.

I don't know how familiar you are with high end audio but there are tuners out there that can switch between narrow and wide band IF, and I think a few, very few, variable. The wider bandwidth results in much lower distortion.. However then there is more noise and you need a stronger signal. But the ultimate THD at "full quieting" is actually enough I used to be able to hear it. But on weaker stations you might want the narrow IF bandwidth. I think a couple of vary rare high end tuners used variable, maybe Studer Revox or something. In the 1980s, GM car radios got so damn good I thought maybe they had it but after seeing the print (was VERY hard to get) I do not see it. I think the Delco 2000s are Schotz tuners but I don't know if they vary the IF bandwidth. Later car stereo designs wen into multiple antennae and front ends that switched, quite transient free actually, between up to four of them. Yup, four front ends. I seen it.

Now, this digital information bothers high fidelity tuners. they are coming out with modifications to the ones with the worst susceptibility. I mean even tuners built in the 1970s. Some of them were damn good. Now, the digital information makes for like "hash" or whatever, an unpleasant background noise.

I saw a modification for it and surprising to me is it was not something to cut the IF bandwidth, it was strictly in the ratio detector. It seems the newer quadrature detectors don't have much of a problem with this, so far I saw.

Of course next year they will probably try to put four sports video channels in an FM bandwidth and we just all have to buy new radios. Leave me out, I have all the music and movies I will ever need. Even porn. Well I got that from a buddy for whom I am providing an "offsite backup".

But there is no breaking the laws of physics. When you cram more into that carrier there is a cost. Either noise or distortion. Maybe both, or maybe you can take your pick. The distribution of harmonics in FM is a funny thing, it is not like AM which is simple. They go up high to insert their digital data and probably 85 % of the people do not notice, but then some do.

Actually it is all going digital soon, a couple of countries are in the process of that right now. That eans if you drive an older car you will need to but a convertor, or just play disks. Or AM. As far as I know they have no plans to fuck AM up anymore than they did with AM stereo. And that wasn't so bad because AM is not supposed to be high fidelity.

But when the transistion comes you will have like 500 stations.

Know what ? When I was a kkid we had like five TV stations and we had to sit down and talk about what we were going to watch. (before Star Trek...) We looked at a paper with the schedule on it. Actually we watched some of the movies they rated the worst lol, but that is not the point. Today with the cable there are 500 channels and nothing to watch.

Orwell - less is more.

 

[Jeff Liebermann]

On Sat, 28 May 2016 23:26:44 +0000 (UTC),
vjp2.at@at.BioStrategist.dot.dot.com wrote:

Are such radios sold in the USA via the internet? Is the station really
"fixed"? Someone gave my uncle a radio which is said to have a special
"chip" that receives a Greek radio station. He mentioned to me that years ago
he had another one that suddenly switched to a Philipine station and he gave
it to a Filipino colleague. Amazon and Alibaba have such Metrosonix radios
but not station specific, but also do not seem to allow being sold in the
USA. THe search terms I used were <SCA FM radio>.
- = -
Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist

Yes, but not quite in the way you describe:
<https://en.wikipedia.org/wiki/Subsidiary_communications_authority>
In the USA, additional SCA carriers used to be quite common on most FM
stations. They were used to subscription handle background music
(MUZAK), commercial free radio, and all kinds of data broadcasting
(stocks, paging, sports scores, traffic reports, etc).

Most of that died starting in about 2002 with the introduction of
digital FM radio.
<https://en.wikipedia.org/wiki/HD_Radio>
The IBOC signals occupy the spectrum just outside of the normal FM
stereo signals formerly occupied by SCA sub-carriers. SCA and IBOC
cannot coexist on the same frequency.

In the USA, FM broadcast channel spacing is 200KHz. Stations licenses
in a given geographic area are assigned on alternate 200KHz slots
giving broadcasters a 200KHz guard band to allow for junk receivers
with rather wide IF bandwidth. SCA sub-carriers never went above
about 80Khz, so there was no increase in occupied bandwidth. IBOC
changed all that by grabbing all the spectrum between +/-100kHz and
+/-200KHz:
<http://802.11junk.com/jeffl/crud/KCSM.jpg>
Such an IBOC transmitter is now transmitting on top of the adjacent
channels frequency. If the adjacent channel is not occupied, no
problem. If there's a station there, big problem.

In some parts of Europe, FM stations are assigned on 100KHz channel
spacing, making both SCA and IBOC an impossibility. I don't know
which countries are like that.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[Michael Black]

On Sat, 28 May 2016, vjp2.at@at.BioStrategist.dot.dot.com wrote:

Are such radios sold in the USA via the internet? Is the station really
"fixed"? Someone gave my uncle a radio which is said to have a special
"chip" that receives a Greek radio station. He mentioned to me that years ago
he had another one that suddenly switched to a Philipine station and he gave
it to a Filipino colleague. Amazon and Alibaba have such Metrosonix radios
but not station specific, but also do not seem to allow being sold in the
USA. THe search terms I used were <SCA FM radio>.

Tradionally SCA was used for "elevator music", it was a subcarrier on an
FM broadcast station, a way for the elevator music company to distribute
its product. You could build your own SCA adapters, once ICs came along
they were really common in the hobby magazines, but it was one of those
things that you couldn't share the results with someone else. It was for
private listening only.

But yes, then at some point it was a way for "ethnic" broadcasters to beon
the air without the expense of a full FM transmitter, or getting a
license. We had some of that here. I think the stations were hoping to
be the source of the radios with the adapters, an income stream ofsome
sort.

But I haven't heard of such things locally. One thing that happened in at
least one case was they were able to leap to their own transmitter (though
if I'm remembering right in that case, the station is now up for sale, it
not being profitable for that market). So maybe it was an intermediate
step, get the listeners, then jump to a full transmitter when you had the
listeners.

Michael

 

[Bruce Esquibel]

vjp2.at@at.biostrategist.dot.dot.com wrote:

Are such radios sold in the USA via the internet? Is the station really
"fixed"? Someone gave my uncle a radio which is said to have a special
"chip" that receives a Greek radio station. He mentioned to me that years ago
he had another one that suddenly switched to a Philipine station and he gave
it to a Filipino colleague. Amazon and Alibaba have such Metrosonix radios
but not station specific, but also do not seem to allow being sold in the
USA. THe search terms I used were <SCA FM radio>.

I'd be kind of suprised if any of those stations were still active.

Here in Chicago, it was probably the early 90's that was the height of
popularity, I think there were 2 greek stations, one polish and 3 or 4
others that were probably used for pocket pagers (normally silent except for
bursts of tones or a data carrier).

The basic idea was the "broadcaster" would get the station from overseas
(probably via a C-Band dish/receiver) and rebroadcast it on someones sca
channel (an ordinary FM station set up for it). They would then rent the
modified radio for like $5 a month or sell you it with a "lifetime"
subscription for $100 or around there.

Usually the radios, which were cheap garbage imports, were fixed to the
primary channel by crazy glueing the tuning shaft or otherwise disabling the
tuner. The boards were just simple 4 wire things, power, ground, detector in
and audio out. Since they were meant as a dedicated service, there wasn't
any reason to make the radio work both ways, normal and special. These
were all handmade and varied quite a bit, depending on what make/models the
local wholesale importers had.

The adapters were numerous, the most basic/simple one used a PLL chip
(either NE565 or NE566, maybe) and off the shelf resistors and capacitors.
They usually worked well enough but had problems with leakage from the main
carrier. There was another design, I want to say MC1340 as the centerpeice
which had the best performance (dead quiet) but required custom rf coils and
oddball capacitors, still simple to build but upped the cost quite a bit.

In any case the boards were probably not even 2"x2" and were easily tucked
in somewhere, usually the battery holder (4xC or D cells).

As far as legality of them, although I don't think anyone considered them a
crime to own, you couldn't open up a cottage industry by building them and
selling them. There was no reason to stop anyone from making one, but they
fell into that gray area where selling one was in some violation of FCC
rules and regs for 3rd party interception of a private (or intended private)
broadcast.

The thing is, once the internet and access to it became the norm (early
2000's), I really don't think those rebroadcasters could survive. On nearly
any platform or device there is usually one or two applications available
for listening to radio stations from aroound the world, if not dozens of
websites that retransmit them.

I'd guess there are plenty of 80+ year old grandmothers from the old country
who can work turning on and off a radio rather than firing up a laptop but I
doubt there is enough to make any money off them.

-bruce
bje@ripco.com

 

[Jeff Liebermann]

On Sat, 28 May 2016 22:13:54 -0700 (PDT), jurb6006@gmail.com wrote:

"SCA sub-carriers never went above
about 80Khz, so there was no increase in occupied bandwidth. IBOC
changed all that by grabbing all the spectrum between +/-100kHz and
+/-200KHz: "

I don't know how familiar you are with high end audio but there
are tuners out there that can switch between narrow and wide band IF,
and I think a few, very few, variable. The wider bandwidth results
in much lower distortion. However then there is more noise and
you need a stronger signal.

What little I've done with broadcast FM was at various radio stations
and designing some low end receivers. That was also long ago, so I'm
fairly well behind on the technology. However, if "high end" means
"high price", I've fixed a few of these systems:
<http://www.elanhomesystems.com>

If you've ever swept a decent analog FM receiver, you may have noticed
that the IF bandwidth is much wider than the occupied bandwidth
(200KHz) of the signal. In order to keep the group delay fairly
constant within the IF bandwidth, this was necessary. That meant that
while the audio was very good quality, the receiver would pickup junk
from adjacent channels. Sensitivity is limited by the receiver front
end and is unaffected by the wider bandwidth.

Roll forward a few decades and we are now blessed with all digital
receivers. The best example is the Sony XDR-F1HD tuner:
<http://ham-radio.com/k6sti/xdr-f1hd.htm>
<http://www.amazon.com/Sony-XDR-F1HD-Radio-Discontinued-Manufacturer/dp/B00168Q248>
These typically sell on eBay for $150 to $250 or $500 with some
necessary modifications. Seems to be a demand:
<http://www.ebay.com/sch/i.html?_from=R40&_nkw=XDR-F1HD&LH_Complete=1&LH_Sold=1>
The difference is that this receiver has a "brick wall" digital IF
filter that doesn't need to be excessively wide in order to get low
group delay and low distortion. The narrower bandwidth is also good
for reducing much of the alternate channel noise produced by IBOC (HD
Radio) signals.

Meanwhile, the lower end FM receivers are also deriving benefits from
digital IF and demodulators. The Sony tuner uses an NXP/Philips
SAF7730 chip while most of the low end stuff uses various Silicon Labs
AM/FM chips:
<http://www.silabs.com/products/audio/fm-am-receiver/>
<http://www.silabs.com/products/audio/fmreceivers/>
Basically, it's almost an SDR (software defined radio) with most
everything in a single chip. Tecsun uses these chips in their various
radios. Plugged into a proper audio amp and speakers, they sound very
good, with little IBOC junk from the adjacent channels. (Note: Not
all Tecsun radios use digital receiver chips).

Actually it is all going digital soon, a couple of countries are in
the process of that right now.

No, it's not, at least in the USA. The FCC, in its infinite wisdom,
has endorse exactly one proprietary and expensive standard (IBOC)
totally owned and licensed by iBiquity. As usual, half measures don't
work. In this case, the broadcast industry wasn't quite sure if they
were going to commit to doing IBOC, so instead of 100% digital FM,
iBiquity was forced to provide the half ass analog/digital compatible
system that we're cursed with today. Incidentally, the failed AM
stereo system following a similar life cycle demonstrating that the
FCC and the industry doesn't learn from their expensive mistakes.

In 2012, a made a graph of the number of HD Radio stations in the SF
Bay area and in the USA.
<http://802.11junk.com/jeffl/crud/hd-radio-stations-calif.jpg>
<http://802.11junk.com/jeffl/crud/hd_radio_stations.jpg>
<http://www.stateofthemedia.org/2013/audio-digital-drives-listener-experience/9-number-of-stations-dropping-hd-outnumber-those-adopting-in-2012/>
There's actually been a decrease in stations, that have unplugged
their HD Radio equipment since 2012 but I don't have numbers handy.

I know little (or nothing) of what's going on with DAB (digital audio
broadcasting) as it's not used in the USA:
<https://en.wikipedia.org/wiki/Digital_audio_broadcasting>

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[Dave Platt]

In article <f8dd99f8-b2a4-4800-8fd2-de2d449496e1@googlegroups.com>,
<jurb6006@gmail.com> wrote:

Now, this digital information bothers high fidelity tuners. they are coming out with modifications to the
ones with the worst susceptibility. I mean even tuners built in the 1970s. Some of them were damn good. Now,
the digital information makes for like "hash" or whatever, an unpleasant background noise.

I saw a modification for it and surprising to me is it was not something to cut the IF bandwidth, it was
strictly in the ratio detector. It seems the newer quadrature detectors don't have much of a problem with
this, so far I saw.

The digital noise is commonly a problem as the result of the way
stereo demultiplexing works. The higher-frequency components of the
FM detector's output are mixed against the 38 kHz local oscillator,
thus doing an AM demodulation of the L-R subcarrier band which lies on
either side of 38 kHz.

Many MPX decoders use a simple switching-mixer architecture, and these
will end up detecting both the signal around 38 kHz, but also whatever
is present in the neighborhood of the third and fifth harmonic of 38
kHz. Since that's where the digital subcarriers often line, the
digital signal ends up as sideband noise in the L-R difference signal,
and (unless you switch the tuner to "mono") ends up in the left and
right channel audio.

There are a number of ways to fix this. One is to filter the FM
detector output signal before it goes to the MPX chip... either a
low-pass filter (knee somewhere about 60 kHz), or notch filters
centered on the odd harmonics of 38 kHz, or both.

Another approach is to demodulate the MPX signal using a design which
is inherently not sensitive to the 38 kHz harmonic regions... e.g. a
true multiplying mixer using a 38 kHz sinewave local oscillator
(rather than a square wave or switching design), or a Walsh-function
decoder using a stepped wave which has no 3rd or 5th harmonic
content (some Sansui tuners do this).

Modern DSP-based MPX decoders could do any of these.

http://ham-radio.com/k6sti/hdrsn.htm has a nice overview of the
problem and solutions.

 

[Jeff Liebermann]

On Sun, 29 May 2016 11:13:09 -0700, dplatt@coop.radagast.org (Dave
Platt) wrote:

http://ham-radio.com/k6sti/hdrsn.htm has a nice overview of the
problem and solutions.

That article is on HD Radio (IBOC, iBiquity, dismal radio, etc) and
not about conventional FM stereo. While the mechanism for generating
the noise that you don't want to hear is similar, the technology,
solutions, and sources of noise are quite different. For example,
there's no mixing required for the excessive occupied bandwidth of
IBOC to ruin your day.

Incidentally, Brian Beezley has written several other articles on HD
Radio and tuners:
<http://ham-radio.com/k6sti/>
See "HD Radio" section at lower right and various equipment reviews at
the upper right.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[isw]

In article <f8dd99f8-b2a4-4800-8fd2-de2d449496e1@googlegroups.com>,
jurb6006@gmail.com wrote:

"SCA sub-carriers never went above
about 80Khz, so there was no increase in occupied bandwidth. IBOC
changed all that by grabbing all the spectrum between +/-100kHz and
+/-200KHz: "

But bear in mind there were adverse implications. When it was simple "store
cast allocation" it was at 76 KHz, locked to the 19 KHz stereo pilot. The
deviation was very low and did not produce much in the way of sidebands.

SCA usage predates FM stereo. Originally there were two subcarrier
frequencies: 43 kHz and 76 kHz. As stereo broadcasting became popular,
the 43 kHz channel was abandoned due to interference. While some
broadcasters may have synchronized the 76 kHz frequency with the 19 kHz
stereo pilot, this was not required. Plus, since the SCA signal itself
is frequency modulated, locking it to the pilot would not accomplish
much in any case.

Isaac

 

Interesting, in fact everybody, interesting.

Next we need a thread on what all they crammed into the NTSC TV signal. Like PRO audio which was another SAP essentially, the VITS or VIR, closed captioning, ghost cancelling reference and who knows what else.

Man's innate lust to cram as much as possible into any given bandwidth.

With TV, they wasted it. They went digital because NTSC takes too much bandwidth and has limited resolution. The problem is they cannot come up with any decent programming anymore.

In other words, the resolution doesn't matter if there's nothing to watch. I don't need 2,000 line resolution to watch Gunsmoke. Just like I don't need 24 bit/96 KHz sampling to listen to music from the 1960s.

 

[jfeng@my-deja.com]

On Monday, May 30, 2016 at 9:43:06 AM UTC-7, jurb...@gmail.com wrote:

With TV, they wasted it. They went digital because NTSC takes too much
bandwidth and has limited resolution. The problem is they cannot come
up with any decent programming anymore.
Digital would take more bandwidth, except they use compression to reduce the amount of data sent. In the 1950s, there was not enough computing power in the whole world to do the compression and decoding in real time.

 

[Michael Black]

On Mon, 30 May 2016, jurb6006@gmail.com wrote:

Interesting, in fact everybody, interesting.

Next we need a thread on what all they crammed into the NTSC TV signal.
Like PRO audio which was another SAP essentially, the VITS or VIR,
closed captioning, ghost cancelling reference and who knows what else.

Man's innate lust to cram as much as possible into any given bandwidth.

No. They had a system first in use in the late 1930s, and times changed.
but they didn't want to start again, so they added that stuff, don't
forget color came in the fifties, tacked onto the existing B&W standard,
but it never improved the picture quality (though no more fussing with the
vertical or horizontal hold controls, actually the tv set I got in 1982
didn't even have them (or at least not on the outside).

With TV, they wasted it. They went digital because NTSC takes too much
bandwidth and has limited resolution. The problem is they cannot come up
with any decent programming anymore.

I actually got my first tv set since 1982 because of the changeover. I
thought about just getting a converter, but decided spending a bit more
meant I got closed captioning, stereo sound, much better image quality,
and of course I got rid of the CRT and went to LCD.

In other words, the resolution doesn't matter if there's nothing to
watch. I don't need 2,000 line resolution to watch Gunsmoke. Just like I
don't need 24 bit/96 KHz sampling to listen to music from the 1960s.

I notice a difference. After 70 or so years, it made sense to actually
scrap the old and move into the future. One might hope that this
"standard" can be extended if needed, so there won't be a need to start
from scratch again in the future.

Michael

 

Wow! incredible answers, thanks


- = -
Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
http://www.panix.com/~vjp2/vasos.htm
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
[Homeland Security means private firearms not lazy obstructive guards]
[Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]

 

[isw]

In article <f98233c5-9087-46e8-9e87-149ee79955d2@googlegroups.com>,
jurb6006@gmail.com wrote:

Interesting, in fact everybody, interesting.

Next we need a thread on what all they crammed into the NTSC TV signal. Like
PRO audio which was another SAP essentially, the VITS or VIR, closed
captioning, ghost cancelling reference and who knows what else.

Man's innate lust to cram as much as possible into any given bandwidth.

With TV, they wasted it.

Actually, NTSC color makes pretty good use of bandwidth when you're
constrained to all-analog, vacuum-tube technology. When it was
introduced, compatible color was right at the cutting edge of (or maybe
a bit beyond) technical feasibility for commercial (not to say consumer)
electronics.

Isaac

 

"Actually, NTSC color makes pretty good use of bandwidth when you're
constrained to all-analog"

Right, but that is not what I meant. I meant none of this shit is worth watching. When I was a kid and we had like five channels we actually had to have a discussion on what to watch.

Now hot only are there more TVs in the house than people, we got like 500 channels. There used to be shows that were entertaining, even though they were kinda like - junk. They were entertaining. Now we are relegated to watching people remodel houses or something, or Gordon Ramsay bitching out restaurant owners or some retired detective describing a 35 year old case, with re-enactment of course. Most other shows it looks like they let an eight year old kid work the camera, I mean they do EVERYTHING cameramen were taught not to do. It is fucking unwatchable.

In the 1960s and 1970s having a TV was a status symbol almost. Now, it has gotten so bad that NOT having one is, almost. Or at least leaving it turned off.

"When it was
introduced, compatible color was right at the cutting edge of (or >maybe
a bit beyond) technical feasibility for commercial (not to say >consumer)
electronics."

Actually it could not be beyond since it worked. It redefined the cutting edge. Color TV is one of the few things the US can claim as its own invention. Other countries came later, albeit with better systems, but I am pretty sure we were first.

I am not sure about FM stereo. Never really looked into it. I know that in Europe they use less modulation and thus less bandwidth. The de-emphasis is 50 uS not 75. I also had the US and European versions of the same album (Golden Earring - Moontan) and their version was cut with alot less groove modulation and had a huge leadout, putting most of the music where the groove velocity was greater and tracking error less. It sounded considerably better. I mean ALOT better.

Seems like the US is all about loud. More modulation, more up compression, and even other tricks to sound louder. Idiots will put their graphic equalizers full tilt up, and have no idea how to properly use a dynamic range expander like a Pioneer RG-1 or RG-2. They think the right way is to turn the input level all the way up. Look asshole, if it was meant to be all the way up all the time why did they even put a control there ?

But that is my opinion after much observation. LOUD is the "American" way. Wasn't it the US came out with laws about reporting the power output of amps ? I guess other countries have the same but that seems like something we probably did first.

 

isw wrote: "In article <f98233c5-9087-46e8-9e87-149ee79955d2@googlegroups.com>,
jurb...@gmail.com wrote:

Interesting, in fact everybody, interesting.

Next we need a thread on what all they crammed into the NTSC TV signal. Like
PRO audio which was another SAP essentially, the VITS or VIR, closed
captioning, ghost cancelling reference and who knows what else.

Man's innate lust to cram as much as possible into any given bandwidth.

With TV, they wasted it.

Actually, NTSC color makes pretty good use of bandwidth when you're
constrained to all-analog, vacuum-tube technology. When it was
introduced, compatible color was right at the cutting edge of (or maybe
a bit beyond) technical feasibility for commercial (not to say consumer)
electronics.

Isaac "

And ATSC 1.0 color gamut is actually a hair smaller than
that of the NTSC it replaced.

 

"And ATSC 1.0 color gamut is actually a hair smaller than
that of the NTSC it replaced. "

You lost me there, what do you mean by that ? The different broadcasting format should have nothing to do with the colors that can be displayed, that is a function of the panel, or CRT. (actually a plasma panel is like a CRT in a way but it just has multiple rays)

Now LCD panels might be limited by the backlight. They cannot display any color that is not in the spectrum of the backlight. Actually they could not handle the colorimetry required for LED backlighting until recently when the new generation of LEDs cam out that actually have a phosphor.

Older LEDs had very spikey outputs. If a color isn't there you must display two colors opposite the wavelength you want in the right proportion so the eye mixes it. It was just too much to deal with so they went with the CCFLs.

 

jurb...gmail.com wrote: "You lost me there, what do you mean by that ? The different broadcasting format should
have nothing to do with the colors that can be displayed,"

To the contrary. A display may be capable of limitless
color and dynamic range, but it can reproduce only
what it is sent.

 

[isw]

In article <58c7e2a0-382c-4138-9652-41cf6864c633@googlegroups.com>,
jurb6006@gmail.com wrote:

"Actually, NTSC color makes pretty good use of bandwidth when you're
constrained to all-analog"

Right, but that is not what I meant. I meant none of this shit is worth
watching. When I was a kid and we had like five channels we actually had to
have a discussion on what to watch.

Now hot only are there more TVs in the house than people, we got like 500
channels. There used to be shows that were entertaining, even though they
were kinda like - junk. They were entertaining. Now we are relegated to
watching people remodel houses or something, or Gordon Ramsay bitching out
restaurant owners or some retired detective describing a 35 year old case,
with re-enactment of course. Most other shows it looks like they let an eight
year old kid work the camera, I mean they do EVERYTHING cameramen were taught
not to do. It is fucking unwatchable.

In the 1960s and 1970s having a TV was a status symbol almost. Now, it has
gotten so bad that NOT having one is, almost. Or at least leaving it turned
off.

"When it was
introduced, compatible color was right at the cutting edge of (or >maybe
a bit beyond) technical feasibility for commercial (not to say >consumer)
electronics."

Actually it could not be beyond since it worked.

What I meant was that it worked a lot better in the lab when being
tended by skilled technicians that it did in domestic homes when not
being tended at all. It was somewhat "drifty" and needed a lot of
tweaking.

It redefined the cutting
edge. Color TV is one of the few things the US can claim as its own
invention. Other countries came later, albeit with better systems, but I am
pretty sure we were first.

If you're talking about PAL, which came later, quite good arguments can
be made that it's not better at all; just that its weaknesses are in
different places.

Isaac

 

"If you're talking about PAL, which came later, quite good arguments >can
be made that it's not better at all; just that its weaknesses are in
different places."

Well for one they eliminated the phase control. On US sets it was called the tint or hue control and it shifted the phase of either the chroma subcarrier or the oscillator. Their little scheme cancelled out the errors, which were mainly caused by poor frequency response which would shift the phase of the burst or even make the PLL in the TV have a phase error because part of the burst is cut off. However it happened, you sometimes needed to adjust the tint in the old days.

Also, PAL was more lines. I think it was 50 Hz which would mean they needed a longer persistence phosphor. Also the horizontal rate was faster. They had quite a bit more resolution bt at the cost of frame rate.

But that can be dealt with, you know movies in the theaters only used to be 24 frames per second right ? Well people did not really have a problem with that. They only reason it is a problem with a CRT is because the picture is drawn in a series of lines and that makes it more visible. A film projector is a whole different animal than a TV set.