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On Tue, 03 Nov 2015 17:53:33 +0000, Orchid Win7 v1 wrote:
> Huh. And here I was assuming that Apple would have used only the most
> over-priced hardware components they could source...
>
> ...apparently it's only the *best looking* hardware. :-P
The basic rule of thumb is to buy the least expensive component that meets
the specifications - assuming the specifications are properly, erm,
specified. ;)
That can cause you to run into situations like this:
http://www.staingate.org/
Looks like Apple is responding appropriately to it, though.
Jim
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> Huh. And here I was assuming that Apple would have used only the most
> over-priced hardware components they could source...
As Jim said they will put *a lot* of effort in to sourcing the absolute
lowest price parts they can find that will "work". I suspect either
there was a fault with the display you saw, or they had literally shown
the same image for months on end. IIRC the spec we had for Nokia was
something along the lines of showing a big checkerboard pattern for 24
hours, then switching to a white/black screen and no checkerboard
pattern should be visible after 5 seconds. During development we'd quite
often have screens that failed this test, but then the panel and
electronics often weren't optimised at that stage.
> I just remember spending many days (and nights!) in front of a giant
> Grundig CRT driven by my dad's Commodore 64. If you changed the text
> from the default light blue on a dark blue background to being pure
> white, the display got seriously bent.
Yes, it's PSU not being perfect.
> While we're on the subject, what causes the weird diagonal lines that
> all RF-modulated signals have?
Non-perfect electronics :-)
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Le 2015-11-03 12:53, Orchid Win7 v1 a écrit :
> Huh. And here I was assuming that
Stop doing that!
--
/*Francois Labreque*/#local a=x+y;#local b=x+a;#local c=a+b;#macro P(F//
/* flabreque */L)polygon{5,F,F+z,L+z,L,F pigment{rgb 9}}#end union
/* @ */{P(0,a)P(a,b)P(b,c)P(2*a,2*b)P(2*b,b+c)P(b+c,<2,3>)
/* gmail.com */}camera{orthographic location<6,1.25,-6>look_at a }
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On 11/4/2015 2:05 PM, Francois Labreque wrote:
> Le 2015-11-03 12:53, Orchid Win7 v1 a écrit :
>> Huh. And here I was assuming that
>
> Stop doing that!
>
I can't stop giggling. :-)
--
Regards
Stephen
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On 04/11/2015 09:33 AM, scott wrote:
>> Huh. And here I was assuming that Apple would have used only the most
>> over-priced hardware components they could source...
>
> As Jim said they will put *a lot* of effort in to sourcing the absolute
> lowest price parts they can find that will "work". I suspect either
> there was a fault with the display you saw, or they had literally shown
> the same image for months on end.
I left a program running overnight. The next morning, even after booting
back into Mac OS, the text was still faintly visible.
>> While we're on the subject, what causes the weird diagonal lines that
>> all RF-modulated signals have?
>
> Non-perfect electronics :-)
Why lines though? Why not random snow or something?
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On Wed, 04 Nov 2015 18:41:26 +0000, Orchid Win7 v1 wrote:
>>> While we're on the subject, what causes the weird diagonal lines that
>>> all RF-modulated signals have?
>>
>> Non-perfect electronics :-)
>
> Why lines though? Why not random snow or something?
Because radio waves are waves, not "random noise". The proximity of the
transmission source means that the wave is stronger than the other random
RFI in the area, so it stands out.
Jim
--
"I learned long ago, never to wrestle with a pig. You get dirty, and
besides, the pig likes it." - George Bernard Shaw
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On 11/4/2015 7:49 PM, Jim Henderson wrote:
> On Wed, 04 Nov 2015 18:41:26 +0000, Orchid Win7 v1 wrote:
>
>>>> While we're on the subject, what causes the weird diagonal lines that
>>>> all RF-modulated signals have?
>>>
>>> Non-perfect electronics :-)
>>
>> Why lines though? Why not random snow or something?
>
> Because radio waves are waves, not "random noise". The proximity of the
> transmission source means that the wave is stronger than the other random
> RFI in the area, so it stands out.
>
I think it is more likely to be that the RF is not properly tuned.
As you and Scott pointed out:
>
> The basic rule of thumb is to buy the least expensive component that meets
> the specifications
The tuning pots are generally only 10 turn pots and it will be hit and
miss to get an exact match.
--
Regards
Stephen
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On Wed, 04 Nov 2015 20:20:20 +0000, Stephen wrote:
> On 11/4/2015 7:49 PM, Jim Henderson wrote:
>> On Wed, 04 Nov 2015 18:41:26 +0000, Orchid Win7 v1 wrote:
>>
>>>>> While we're on the subject, what causes the weird diagonal lines
>>>>> that all RF-modulated signals have?
>>>>
>>>> Non-perfect electronics :-)
>>>
>>> Why lines though? Why not random snow or something?
>>
>> Because radio waves are waves, not "random noise". The proximity of
>> the transmission source means that the wave is stronger than the other
>> random RFI in the area, so it stands out.
>>
> I think it is more likely to be that the RF is not properly tuned.
> As you and Scott pointed out:
>
>
>> The basic rule of thumb is to buy the least expensive component that
>> meets the specifications
>
> The tuning pots are generally only 10 turn pots and it will be hit and
> miss to get an exact match.
Could be - generally a harmonic frequency can cause weirdness as well - I
was more talking about why it's lines and not just snow. The proximity
of the transmitter to the "receiver" is what causes that.
Jim
--
"I learned long ago, never to wrestle with a pig. You get dirty, and
besides, the pig likes it." - George Bernard Shaw
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On 11/4/2015 9:32 PM, Jim Henderson wrote:
> On Wed, 04 Nov 2015 20:20:20 +0000, Stephen wrote:
>
>> On 11/4/2015 7:49 PM, Jim Henderson wrote:
>>> On Wed, 04 Nov 2015 18:41:26 +0000, Orchid Win7 v1 wrote:
>>>
>>>>>> While we're on the subject, what causes the weird diagonal lines
>>>>>> that all RF-modulated signals have?
>>>>>
>>>>> Non-perfect electronics :-)
>>>>
>>>> Why lines though? Why not random snow or something?
>>>
>>> Because radio waves are waves, not "random noise". The proximity of
>>> the transmission source means that the wave is stronger than the other
>>> random RFI in the area, so it stands out.
>>>
>> I think it is more likely to be that the RF is not properly tuned.
>> As you and Scott pointed out:
>>
>>
>>> The basic rule of thumb is to buy the least expensive component that
>>> meets the specifications
>>
>> The tuning pots are generally only 10 turn pots and it will be hit and
>> miss to get an exact match.
>
> Could be - generally a harmonic frequency can cause weirdness as well - I
> was more talking about why it's lines and not just snow. The proximity
> of the transmitter to the "receiver" is what causes that.
>
From the little I know only having worked, with Comms guys. You are
right but then you could tell me anything. It is all magic to me.
They even told me that our phone calls were bounced off the sky and the
sea. And I believed them.
--
Regards
Stephen
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On Wed, 04 Nov 2015 22:14:15 +0000, Stephen wrote:
>> Could be - generally a harmonic frequency can cause weirdness as well -
>> I
>> was more talking about why it's lines and not just snow. The proximity
>> of the transmitter to the "receiver" is what causes that.
>>
>>
> From the little I know only having worked, with Comms guys. You are
> right but then you could tell me anything. It is all magic to me.
> They even told me that our phone calls were bounced off the sky and the
> sea. And I believed them.
Well, I do have a radio license. ;)
Radio signal strength is a factor of power - with a falloff of 1/r^2
(when an antenna is in use, this can vary somewhat depending on the type
of antenna, but that's beyond my knowledge; I've read, for example, that
a dipole antenna ends up being somewhere between 1/r^2 and 1/r).
But that's the reason that proximity to the transmission point for the EM
waves matters - and a closer but power power (at transmission point)
overpower a signal that's farther away but stronger. With a 5W
transmitter that's not well filtered, an amateur radio operator can
disrupt commercial radio (AM/FM) and TV (VHF/UHF) transmissions quite
significantly. Every amateur radio operator has to learn at least a
little about this in the US, because we're responsible for dealing with
harmful interference we might cause with our gear.
Even with well-filtered equipment, though, if I put the transmission
source for my radio right next to a computer monitor or CRT display, I
can cause some interference.
Jim
--
"I learned long ago, never to wrestle with a pig. You get dirty, and
besides, the pig likes it." - George Bernard Shaw
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