> On Nov 9, 3:33 pm, Jerry Avins <j...@ieee.org> misquoted:
>
>
>> --
>> Drink deep or taste not the Perian spring.
>> A little knowledge is a dangerous thing.
>> Alexander Pope.
>
>
> Please, Jerry, if you must change your .sig file and use a quote,
> (I very much prefer your usual .sig), use the right words. Here is
> what Alexander Pope actually said.....
>
> First used by Alexander Pope (1688 - 1744) in An Essay on Criticism,
> 1709:
>
> "A little learning is a dangerous thing; drink deep, or taste not
> the Pierian spring: there shallow draughts intoxicate the brain, and
> drinking largely sobers us again."
>
>
> I suppose the Perian spring is where Perier water (usually mis-spelled
> as Perrier water) comes from,,,,
>
> --Dilip Nitpick
A good nit. I even spelled Pierian wrong. My Greek Mythology has become
rusty. "A little knowledge is a dangerous thing." :-)
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Reply by Jerry Avins●November 9, 20092009-11-09
JAlbertoDJ wrote:
>> You make up fairy examples. If the signal frequency can change at the
>> rate of 6 Hz/sec, the sidebands will cause problems. What technology is
>> as poor as you choose to suppose? How accurate is your cheap wristwatch?
>>
>
> For example, i know that doppler spread of ionospheric can be about 3Hz.
How fast? Investigate AFC. http://tinyurl.com/y93pb3w
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Reply by dvsarwate●November 9, 20092009-11-09
On Nov 9, 3:33�pm, Jerry Avins <j...@ieee.org> misquoted:
> --
> Drink deep or taste not the Perian spring.
> A little knowledge is a dangerous thing.
> � � � � � � � � � � � � � � � � � � � � � � �Alexander Pope.
Please, Jerry, if you must change your .sig file and use a quote,
(I very much prefer your usual .sig), use the right words. Here is
what Alexander Pope actually said.....
First used by Alexander Pope (1688 - 1744) in An Essay on Criticism,
1709:
"A little learning is a dangerous thing; drink deep, or taste not
the Pierian spring: there shallow draughts intoxicate the brain, and
drinking largely sobers us again."
I suppose the Perian spring is where Perier water (usually mis-spelled
as Perrier water) comes from,,,,
--Dilip Nitpick
Reply by JAlbertoDJ●November 9, 20092009-11-09
>You make up fairy examples. If the signal frequency can change at the
>rate of 6 Hz/sec, the sidebands will cause problems. What technology is
>as poor as you choose to suppose? How accurate is your cheap wristwatch?
>
For example, i know that doppler spread of ionospheric can be about 3Hz.
Reply by Jerry Avins●November 9, 20092009-11-09
JAlbertoDJ wrote:
>> JAlbertoDJ wrote:
>>>> The answer is NO.
>>>>
>>>> High bitrate: 0101010101010101....
>>>> Low bitrate: 0000111100001111....
>>>>
>>>> Think about it.
>>>>
>>>> VLV
>>>>
>>> But, for example, suposse the case of a BFSK at 1 baud.
>>>
>>> F0= 1000 Hz
>>> F1= 2000 Hz
>>>
>>> Frecuency carrier error maximum: +-10 Hz.
>> You make things up. How can you get that kind of frequency error? cheap
>> crystals are good to a part in 10e-7. Nobody with any sense would assign
>
>> two frequencies in simple harmonic relation.
>
> In the case of an example, somebody with a sense could assign two
> frequencies in simple harmonic relation.
n the case of an example, somebody with a sense could design a bicycle
with square wheels, but it wouldn't be a sensible bicycle.
>>> Then, signal received during interval of 1 bit, for example could be:
>>>
>>> F0= 1006 Hz
>>> F1= 1997 Hz
>>>
>>> At 1 baud signal received is out of the range of the macht filter.
>> The longer the symbol lasts, the more time there is to integrate.
>> Integration reduces noise.
>
> Integration reduces noise, but if frecuency is not estable you can be
> integrating only noise.
You make up fairy examples. If the signal frequency can change at the
rate of 6 Hz/sec, the sidebands will cause problems. What technology is
as poor as you choose to suppose? How accurate is your cheap wristwatch?
Jerry
--
Drink deep or taste not the Perian spring.
A little knowledge is a dangerous thing.
Alexander Pope.
�����������������������������������������������������������������������
Reply by JAlbertoDJ●November 9, 20092009-11-09
>
>
>JAlbertoDJ wrote:
>
>>>That only tels that your receiver is not optimal in case of unstable
>>>carrier. Modify the receiver accordingly.
>>>
>>>VLV
>>>
>>>
>>
>>
>> For example, with Fast FHSS?
>
>Idiot
>
i dont know if you are a lunatic or you dont understand my reply.
Reply by JAlbertoDJ●November 9, 20092009-11-09
>JAlbertoDJ wrote:
>>> The answer is NO.
>>>
>>> High bitrate: 0101010101010101....
>>> Low bitrate: 0000111100001111....
>>>
>>> Think about it.
>>>
>>> VLV
>>>
>>
>> But, for example, suposse the case of a BFSK at 1 baud.
>>
>> F0= 1000 Hz
>> F1= 2000 Hz
>>
>> Frecuency carrier error maximum: +-10 Hz.
>
>You make things up. How can you get that kind of frequency error? cheap
>crystals are good to a part in 10e-7. Nobody with any sense would assign
>two frequencies in simple harmonic relation.
In the case of an example, somebody with a sense could assign two
frequencies in simple harmonic relation.
>
>> Then, signal received during interval of 1 bit, for example could be:
>>
>> F0= 1006 Hz
>> F1= 1997 Hz
>>
>> At 1 baud signal received is out of the range of the macht filter.
>
>The longer the symbol lasts, the more time there is to integrate.
>Integration reduces noise.
Integration reduces noise, but if frecuency is not estable you can be
integrating only noise.
Reply by Vladimir Vassilevsky●November 9, 20092009-11-09
JAlbertoDJ wrote:
>>That only tels that your receiver is not optimal in case of unstable
>>carrier. Modify the receiver accordingly.
>>
>>VLV
>>
>>
>
>
> For example, with Fast FHSS?
Idiot
Reply by Jerry Avins●November 8, 20092009-11-08
JAlbertoDJ wrote:
>> The answer is NO.
>>
>> High bitrate: 0101010101010101....
>> Low bitrate: 0000111100001111....
>>
>> Think about it.
>>
>> VLV
>>
>
> But, for example, suposse the case of a BFSK at 1 baud.
>
> F0= 1000 Hz
> F1= 2000 Hz
>
> Frecuency carrier error maximum: +-10 Hz.
You make things up. How can you get that kind of frequency error? cheap
crystals are good to a part in 10e-7. Nobody with any sense would assign
two frequencies in simple harmonic relation.
> Then, signal received during interval of 1 bit, for example could be:
>
> F0= 1006 Hz
> F1= 1997 Hz
>
> At 1 baud signal received is out of the range of the macht filter.
The longer the symbol lasts, the more time there is to integrate.
Integration reduces noise.
Jerry
--
Drink deep or taste not the Perian spring.
A little knowledge is a dangerous thing.
Alexander Pope.
�����������������������������������������������������������������������
Reply by JAlbertoDJ●November 8, 20092009-11-08
>That only tels that your receiver is not optimal in case of unstable
>carrier. Modify the receiver accordingly.
>
>VLV
>
>