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Question about analog cell phones
Question about analog cell phones
Hi:
Why do analog cell phones use FM? Why not AM?
Microwave-frequencies can be done in AM just as well as FM? Why not
use AM?
In order to avoid "clipping" and interference with nearby stations,
the modulator signal should be attenuated prior to D-A conversion and
transmission. At the receiving end, the carrier signal should be
amplified prior to demodulation and A-D conversion.
Thanks,
Radium
Hi:
Why do analog cell phones use FM? Why not AM?
Microwave-frequencies can be done in AM just as well as FM? Why not
use AM?
In order to avoid "clipping" and interference with nearby stations,
the modulator signal should be attenuated prior to D-A conversion and
transmission. At the receiving end, the carrier signal should be
amplified prior to demodulation and A-D conversion.
Thanks,
Radium
Re: Question about analog cell phones
Radium wrote:
> Hi:
>
> Why do analog cell phones use FM? Why not AM?
>
> Microwave-frequencies can be done in AM just as well as FM? Why not
> use AM?
Why ? AM is more susceptable to noise and inrterference.
>
> In order to avoid "clipping" and interference with nearby stations,
> the modulator signal should be attenuated prior to D-A conversion and
> transmission. At the receiving end, the carrier signal should be
> amplified prior to demodulation and A-D conversion.
Yer what ?
geoff
Radium wrote:
> Hi:
>
> Why do analog cell phones use FM? Why not AM?
>
> Microwave-frequencies can be done in AM just as well as FM? Why not
> use AM?
Why ? AM is more susceptable to noise and inrterference.
>
> In order to avoid "clipping" and interference with nearby stations,
> the modulator signal should be attenuated prior to D-A conversion and
> transmission. At the receiving end, the carrier signal should be
> amplified prior to demodulation and A-D conversion.
Yer what ?
geoff
Re: Question about analog cell phones
On May 24, 4:53 pm, "Geoff" <g...@nospam-paf.co.nz> wrote:
> Radium wrote:
> > Hi:
>
> > Why do analog cell phones use FM? Why not AM?
>
> > Microwave-frequencies can be done in AM just as well as FM? Why not
> > use AM?
> Why ? AM is more susceptable to noise and inrterference.
AM interferences are more interesting and entertaining than the boring
hiss you get with bad FM reception.
On May 24, 4:53 pm, "Geoff" <g...@nospam-paf.co.nz> wrote:
> Radium wrote:
> > Hi:
>
> > Why do analog cell phones use FM? Why not AM?
>
> > Microwave-frequencies can be done in AM just as well as FM? Why not
> > use AM?
> Why ? AM is more susceptable to noise and inrterference.
AM interferences are more interesting and entertaining than the boring
hiss you get with bad FM reception.
Re: Question about analog cell phones
"Radium" <glucegen1@gmail,com > wrote in message
news:1180052771.131522.253240@d30g2000prg.googlegroups,com ...
> On May 24, 4:53 pm, "Geoff" <g...@nospam-paf.co.nz> wrote:
>
>> Radium wrote:
Spoken like a true CB'er there Radium....
You are totally CLUELESS!
All you seem to know are buzzwords and have no idea how "radio" works.
"Radium" <glucegen1@gmail,com > wrote in message
news:1180052771.131522.253240@d30g2000prg.googlegroups,com ...
> On May 24, 4:53 pm, "Geoff" <g...@nospam-paf.co.nz> wrote:
>
>> Radium wrote:
Spoken like a true CB'er there Radium....
You are totally CLUELESS!
All you seem to know are buzzwords and have no idea how "radio" works.
Re: Question about analog cell phones
"Bob's Backfire Burrito" <BLAMPOW!@pullmyfinger.org> wrote in message
news:qSB5i.3118$u56.1464@newssvr22.news.prodigy,net ...
>
> "Radium" <glucegen1@gmail,com > wrote in message
> news:1180052771.131522.253240@d30g2000prg.googlegroups,com ...
>> On May 24, 4:53 pm, "Geoff" <g...@nospam-paf.co.nz> wrote:
>>
>>> Radium wrote:
>
> Spoken like a true CB'er there Radium....
> You are totally CLUELESS!
> All you seem to know are buzzwords and have no idea how "radio" works.
The similarities between Usenet and CB are staggering.
"Bob's Backfire Burrito" <BLAMPOW!@pullmyfinger.org> wrote in message
news:qSB5i.3118$u56.1464@newssvr22.news.prodigy,net ...
>
> "Radium" <glucegen1@gmail,com > wrote in message
> news:1180052771.131522.253240@d30g2000prg.googlegroups,com ...
>> On May 24, 4:53 pm, "Geoff" <g...@nospam-paf.co.nz> wrote:
>>
>>> Radium wrote:
>
> Spoken like a true CB'er there Radium....
> You are totally CLUELESS!
> All you seem to know are buzzwords and have no idea how "radio" works.
The similarities between Usenet and CB are staggering.
Re: Question about analog cell phones
On May 24, 7:28 pm, Radium <gluceg...@gmail,com > wrote:
> Hi:
>
> Why do analog cell phones use FM? Why not AM?
>
Do you even know if they do?
> Microwave-frequencies can be done in AM just as well
> as FM? Why not use AM?
Why not use FM?
Do you know they use FM?
> In order to avoid "clipping" and interference with nearby stations,
> the modulator signal should be attenuated prior to D-A conversion and
> transmission.
Why?
Why would you use D-A conversion at the TRANSMITTER?
> At the receiving end, the carrier signal should be
> amplified prior to demodulation and A-D conversion.
Why would you use A-D conversion at the RECEIVER?
If it's an "analog phone," why is it using A-D and D-A?
Do you know what an "analog cell phone" is?
On May 24, 7:28 pm, Radium <gluceg...@gmail,com > wrote:
> Hi:
>
> Why do analog cell phones use FM? Why not AM?
>
Do you even know if they do?
> Microwave-frequencies can be done in AM just as well
> as FM? Why not use AM?
Why not use FM?
Do you know they use FM?
> In order to avoid "clipping" and interference with nearby stations,
> the modulator signal should be attenuated prior to D-A conversion and
> transmission.
Why?
Why would you use D-A conversion at the TRANSMITTER?
> At the receiving end, the carrier signal should be
> amplified prior to demodulation and A-D conversion.
Why would you use A-D conversion at the RECEIVER?
If it's an "analog phone," why is it using A-D and D-A?
Do you know what an "analog cell phone" is?
Re: Question about analog cell phones
On May 24, 4:55 pm, dpie...@cartchunk.org wrote:
> On May 24, 7:28 pm, Radium <gluceg...@gmail,com > wrote:
>
> > Hi:
>
> > Why do analog cell phones use FM? Why not AM?
>
> Do you even know if they do?
Yes. I read about it.
>
> > Microwave-frequencies can be done in AM just as well
> > as FM? Why not use AM?
>
> Why not use FM?
FM is limited to line of sight.
> > In order to avoid "clipping" and interference with nearby stations,
> > the modulator signal should be attenuated prior to D-A conversion and
> > transmission.
>
> Why?
>
> Why would you use D-A conversion at the TRANSMITTER?
>
> > At the receiving end, the carrier signal should be
> > amplified prior to demodulation and A-D conversion.
>
> Why would you use A-D conversion at the RECEIVER?
>
> If it's an "analog phone," why is it using A-D and D-A?
>
> Do you know what an "analog cell phone" is?
Sorry. I should've left out the D-A/A-D conversion.
Stupid me.
On May 24, 4:55 pm, dpie...@cartchunk.org wrote:
> On May 24, 7:28 pm, Radium <gluceg...@gmail,com > wrote:
>
> > Hi:
>
> > Why do analog cell phones use FM? Why not AM?
>
> Do you even know if they do?
Yes. I read about it.
>
> > Microwave-frequencies can be done in AM just as well
> > as FM? Why not use AM?
>
> Why not use FM?
FM is limited to line of sight.
> > In order to avoid "clipping" and interference with nearby stations,
> > the modulator signal should be attenuated prior to D-A conversion and
> > transmission.
>
> Why?
>
> Why would you use D-A conversion at the TRANSMITTER?
>
> > At the receiving end, the carrier signal should be
> > amplified prior to demodulation and A-D conversion.
>
> Why would you use A-D conversion at the RECEIVER?
>
> If it's an "analog phone," why is it using A-D and D-A?
>
> Do you know what an "analog cell phone" is?
Sorry. I should've left out the D-A/A-D conversion.
Stupid me.
Re: Question about analog cell phones
"Radium" <glucegen1@gmail,com > wrote in message
news:1180052659.659348.44940@x35g2000prf.googlegroups,com ...
> Stupid me.
At last a Radium statement I can agree with :-)
MrT.
"Radium" <glucegen1@gmail,com > wrote in message
news:1180052659.659348.44940@x35g2000prf.googlegroups,com ...
> Stupid me.
At last a Radium statement I can agree with :-)
MrT.
Re: Question about analog cell phones
On May 24, 8:24 pm, Radium <gluceg...@gmail,com > wrote:
> On May 24, 4:55 pm, dpie...@cartchunk.org wrote:
>
> > On May 24, 7:28 pm, Radium <gluceg...@gmail,com > wrote:
>
> > > Hi:
>
> > > Why do analog cell phones use FM? Why not AM?
>
> > Do you even know if they do?
>
> Yes. I read about it.
Do you even KNOW if they do?
You seem to read about a lot of things and still consistently,
reliably get it wrong.
> > > Microwave-frequencies can be done in AM just as well
> > > as FM? Why not use AM?
>
> > Why not use FM?
>
> FM is limited to line of sight.
Wrong. Utterly, totally, completely wrong.
I sit here listening to WCRB at about 100 MHz,
55 miles away, well beyond line of site distance.
Now, once again, why NOT use FM?
> Stupid me.
Okay, you're now on record for your FIRST correct
statement. How about going for a streak?
On May 24, 8:24 pm, Radium <gluceg...@gmail,com > wrote:
> On May 24, 4:55 pm, dpie...@cartchunk.org wrote:
>
> > On May 24, 7:28 pm, Radium <gluceg...@gmail,com > wrote:
>
> > > Hi:
>
> > > Why do analog cell phones use FM? Why not AM?
>
> > Do you even know if they do?
>
> Yes. I read about it.
Do you even KNOW if they do?
You seem to read about a lot of things and still consistently,
reliably get it wrong.
> > > Microwave-frequencies can be done in AM just as well
> > > as FM? Why not use AM?
>
> > Why not use FM?
>
> FM is limited to line of sight.
Wrong. Utterly, totally, completely wrong.
I sit here listening to WCRB at about 100 MHz,
55 miles away, well beyond line of site distance.
Now, once again, why NOT use FM?
> Stupid me.
Okay, you're now on record for your FIRST correct
statement. How about going for a streak?
Re: Question about analog cell phones
"Radium" <glucegen1@gmail,com > wrote in message news:1180049314.005680.205030@x18g2000prd.googlegroups,com ...
> Hi:
>
> Why do analog cell phones use FM? Why not AM?
Because hard-limiting just prior to the discriminator in an FM receiver
provides a signal-capture effect, in which the strongest of several
competing signals will be received almost free of interference.
Unless the undesired signals are nearly the same strength as the
desired one, the undesired signals are greatly suppressed.
>
> Microwave-frequencies can be done in AM just as well as FM? Why not
> use AM?
Yes, the frequency is irrelevant. FM was chosen for other reasons.
>
> In order to avoid "clipping" and interference with nearby stations,
> the modulator signal should be attenuated prior to D-A conversion and
> transmission. At the receiving end, the carrier signal should be
> amplified prior to demodulation and A-D conversion.
A/D and D/A conversions are techniques used in digital systems, not analog.
However, I did not follow the logic of your statement.
It somewhat resembled the argument for audio-spectrum pre-emphasis
commonly used in recording and broadcasting, but not quite.
That part about amplifying the carrier signal prior to demodulation
made me blink, to say the least.
>
> Radium
>
"Radium" <glucegen1@gmail,com > wrote in message news:1180049314.005680.205030@x18g2000prd.googlegroups,com ...
> Hi:
>
> Why do analog cell phones use FM? Why not AM?
Because hard-limiting just prior to the discriminator in an FM receiver
provides a signal-capture effect, in which the strongest of several
competing signals will be received almost free of interference.
Unless the undesired signals are nearly the same strength as the
desired one, the undesired signals are greatly suppressed.
>
> Microwave-frequencies can be done in AM just as well as FM? Why not
> use AM?
Yes, the frequency is irrelevant. FM was chosen for other reasons.
>
> In order to avoid "clipping" and interference with nearby stations,
> the modulator signal should be attenuated prior to D-A conversion and
> transmission. At the receiving end, the carrier signal should be
> amplified prior to demodulation and A-D conversion.
A/D and D/A conversions are techniques used in digital systems, not analog.
However, I did not follow the logic of your statement.
It somewhat resembled the argument for audio-spectrum pre-emphasis
commonly used in recording and broadcasting, but not quite.
That part about amplifying the carrier signal prior to demodulation
made me blink, to say the least.
>
> Radium
>
Re: Question about analog cell phones
On May 24, 5:15 pm, "John R. Copeland" <jcope...@columbus.rr.aol,com >
wrote:
> "Radium" <gluceg...@gmail,com > wrote in messagenews:1180049314.005680.205030@x18g2000prd.googlegroups,com ...
> > Hi:
>
> > Why do analog cell phones use FM? Why not AM?
> Because hard-limiting just prior to the discriminator in an FM receiver
> provides a signal-capture effect, in which the strongest of several
> competing signals will be received almost free of interference.
> Unless the undesired signals are nearly the same strength as the
> desired one, the undesired signals are greatly suppressed.
Okay.
> > Microwave-frequencies can be done in AM just as well as FM? Why not
> > use AM?
>
> Yes, the frequency is irrelevant. FM was chosen for other reasons.
All right.
>
> > In order to avoid "clipping" and interference with nearby stations,
> > the modulator signal should be attenuated prior to D-A conversion and
> > transmission. At the receiving end, the carrier signal should be
> > amplified prior to demodulation and A-D conversion.
> A/D and D/A conversions are techniques used in digital systems, not analog.
> However, I did not follow the logic of your statement.
Sorry. Please ignore the A/D-D/A part. I accidentaly included it.
> It somewhat resembled the argument for audio-spectrum pre-emphasis
> commonly used in recording and broadcasting, but not quite.
Meaning?
> That part about amplifying the carrier signal prior to demodulation
> made me blink, to say the least.
Why? The idea of amplifying the carrier signal prior to demodulation
is to increase the loudness of the psychedelic heterodynes.
On May 24, 5:15 pm, "John R. Copeland" <jcope...@columbus.rr.aol,com >
wrote:
> "Radium" <gluceg...@gmail,com > wrote in messagenews:1180049314.005680.205030@x18g2000prd.googlegroups,com ...
> > Hi:
>
> > Why do analog cell phones use FM? Why not AM?
> Because hard-limiting just prior to the discriminator in an FM receiver
> provides a signal-capture effect, in which the strongest of several
> competing signals will be received almost free of interference.
> Unless the undesired signals are nearly the same strength as the
> desired one, the undesired signals are greatly suppressed.
Okay.
> > Microwave-frequencies can be done in AM just as well as FM? Why not
> > use AM?
>
> Yes, the frequency is irrelevant. FM was chosen for other reasons.
All right.
>
> > In order to avoid "clipping" and interference with nearby stations,
> > the modulator signal should be attenuated prior to D-A conversion and
> > transmission. At the receiving end, the carrier signal should be
> > amplified prior to demodulation and A-D conversion.
> A/D and D/A conversions are techniques used in digital systems, not analog.
> However, I did not follow the logic of your statement.
Sorry. Please ignore the A/D-D/A part. I accidentaly included it.
> It somewhat resembled the argument for audio-spectrum pre-emphasis
> commonly used in recording and broadcasting, but not quite.
Meaning?
> That part about amplifying the carrier signal prior to demodulation
> made me blink, to say the least.
Why? The idea of amplifying the carrier signal prior to demodulation
is to increase the loudness of the psychedelic heterodynes.
Re: Question about analog cell phones
"Radium" <glucegen1@gmail,com > wrote in message news:1180052930.035517.86580@a26g2000pre.googlegroups,com ...
> On May 24, 5:15 pm, "John R. Copeland" <jcope...@columbus.rr.aol,com >
> wrote:
>
>> That part about amplifying the carrier signal prior to demodulation
>> made me blink, to say the least.
>
> Why? The idea of amplifying the carrier signal prior to demodulation
> is to increase the loudness of the psychedelic heterodynes.
>
OK, now I realize I've been trolled. Sorry to waste the bandwidth. :-(
"Radium" <glucegen1@gmail,com > wrote in message news:1180052930.035517.86580@a26g2000pre.googlegroups,com ...
> On May 24, 5:15 pm, "John R. Copeland" <jcope...@columbus.rr.aol,com >
> wrote:
>
>> That part about amplifying the carrier signal prior to demodulation
>> made me blink, to say the least.
>
> Why? The idea of amplifying the carrier signal prior to demodulation
> is to increase the loudness of the psychedelic heterodynes.
>
OK, now I realize I've been trolled. Sorry to waste the bandwidth. :-(
Re: Question about analog cell phones
"John R. Copeland" wrote:
> OK, now I realize I've been trolled. Sorry to waste the bandwidth. :-(
It's all Radium ever does.
Graham
"John R. Copeland" wrote:
> OK, now I realize I've been trolled. Sorry to waste the bandwidth. :-(
It's all Radium ever does.
Graham
Re: Question about analog cell phones
On May 24, 8:28 pm, Radium <gluceg...@gmail,com > wrote:
> Why? The idea of amplifying the carrier signal prior to demodulation
> is to increase the loudness of the psychedelic heterodynes.
You're an idiot.
On May 24, 8:28 pm, Radium <gluceg...@gmail,com > wrote:
> Why? The idea of amplifying the carrier signal prior to demodulation
> is to increase the loudness of the psychedelic heterodynes.
You're an idiot.
Re: Question about analog cell phones
Radium wrote:
> Hi:
Oh right. You're not blocked on this news server !
Bye.
Graham
Radium wrote:
> Hi:
Oh right. You're not blocked on this news server !
Bye.
Graham
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