AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
 

In message , Michael A. Terrell
writes
Jeff Liebermann wrote:

Conventional TV is VSB (visidual side band)


Vestigal Sideband


Better still, Vestigial Sideband!
--
Ian

AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
 

kev hath wroth:

Jeff Liebermann wrote:

Watch antennas:
http://www.c-max-time.com/products/productsOverview.php?catID=5
See the photos of the various antennas. Too bad there's no specs.

I'll grind out the field strength numbers later. I've been living in
the microwave region for so long, that I'm having problems with LF
calcs.

http://www.c-max-time.com/downloads/getFile.php?id=423
Gives dimensions,No of turns,Inductance etc.

Thanks. I downloaded that yesterday and got a file with no extension.
I eventually figured out it's a PDF file and renamed it.

The site also has a rather sketchy article on antenna design at:
http://www.c-max-time.com/tech/antenna.php
I also found the chip sensitivity somewhere at
0.5uv typical
0.8uv max
with a field strength range of:
15-20 uV/m using a 10mm x 60 mm rod.

I'm currently slogging through the NIST web pile trying to find the
historical or estimated field strengths for the left coast area.
http://tf.nist.gov/timefreq/stations/lflibrary.htm
Ah, foundit:
http://tf.nist.gov/timefreq/general/pdf/1383.pdf
Table 2.4 shows signal strength in San Diego varying from 180 uV/m to
1000 uV/m. Now all I need to do is figure out how much S/N ratio is
required at the receiver input to properly decode the time signals.

All the information needed is probably there, scattered among an
assortment of documents, but I'm at a loss on how to estimate the
actual field strength sensitivity given the rod antenna
specifications. The formula #1 at:
http://www.c-max-time.com/tech/antenna.php
has all the right parameters, but I keep getting insane results when I
try to plug in real and estimated values. Maybe some coffee will
help.

I'll work on it more during the next few daze. It should be easy
(famous last words). However, paying work comes first.

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

AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
 

"Michael A. Terrell" hath wroth:

Jeff Liebermann wrote:
Conventional TV is VSB (visidual side band)

Vestigal Sideband

Ummm... How about Vestigial Sideband instead?
http://www.javvin.com/hardware/VSB.html
http://whatis.techtarget.com/definition/0,,sid9_gci332235,00.html
The last vestige of spelling abilities disappeared long ago and was
replaced by a spellin chequer that lacked the term. Sorry.


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

AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
 

On Mon, 2 Jul 2007 16:41:01 +0100, Ian Jackson wrote:
In message , Michael A. Terrell
writes
Jeff Liebermann wrote:

Conventional TV is VSB (visidual side band)


Vestigal Sideband


Better still, Vestigial Sideband!

You're both wrong. It is VIRTUAL SIDEBAND because it isn't completely
real and the other sideband which isn't virtual carries the missing high
frequency modulation info. Once it gets into your second detector then
it becomes real due to the laws of product modulation.

Next, you will be telling people that VGA doesn't stand for "virtual
graphics array."

--
Posted via a free Usenet account from http://www.tarrnews.net

snip, Snip. SNIP ! the "Rec.Radio.Shortwave" Group from the Newsgroups {Distribution} Header - please, Please. PLEASE !
 

On Jul 2, 6:16 am, Don Bowey wrote:
On 7/1/07 10:06 PM, in article
,

"Telamon" wrote:
In article ,
cledus wrote:

Snip

Would you please have the decency to snip rec.radio.shortwave and other
groups from the newsgroup header. Thanks.

- Would you please come and ask nicely.
- I don't like how you put your order.

don bowey, Don Bowey. DON BOWEY !

Oh Please with Sugar and Spice and Everything Nice
snip, Snip. SNIP ! the "Rec.Radio.Shortwave" Group
from the Newsgroups {Distribution} Header when you
Post your Reply - It would be ever so decent of you
Kind and Wonder Sir. ;-)

thank you very much - most respectfully ~ RHF

AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
 

In article ,
Don Bowey wrote:

On 7/1/07 10:06 PM, in article
,
"Telamon" wrote:

In article ,
cledus wrote:

Snip

Would you please have the decency to snip rec.radio.shortwave and other
groups from the newsgroup header. Thanks.

Would you please come and ask nicely. I don't like how you put your order.

This is a stupid cross posted Troll thread so pretty please with sugar
on it snip the other news groups it does not originate from. Thank you
very, very much in advance.

--
Telamon
Ventura, California

AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
 

On Jul 2, 9:09 pm, Telamon
wrote:
In article ,
Don Bowey wrote:

On 7/1/07 10:06 PM, in article
,
"Telamon" wrote:

In article ,
cledus wrote:

Snip

Would you please have the decency to snip rec.radio.shortwave and other
groups from the newsgroup header. Thanks.

Would you please come and ask nicely. I don't like how you put your order.

This is a stupid cross posted Troll thread so pretty please with sugar
on it snip the other news groups it does not originate from. Thank you
very, very much in advance.

--
Telamon
Ventura, California

Bravo ! ;o} ~ RHF

AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
 

"John Smith I" wrote in message
...
Radium wrote:

snip

Suppose you have a 1 MHz sine wave whose amplitude
is multiplied by a 0.1 MHz sine wave.
What would it look like on an oscilloscope?
What would it look like on a spectrum analyzer?

Then suppose you have a 1.1 MHz sine wave added
to a 0.9 MHz sine wave.
What would that look like on an oscilloscope?
What would that look like on a spectrum analyzer?

AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-lowcarrier frequency
 

Ron Baker, Pluralitas! wrote:
"John Smith I" wrote in message
...
Radium wrote:

snip

Suppose you have a 1 MHz sine wave whose amplitude
is multiplied by a 0.1 MHz sine wave.
What would it look like on an oscilloscope?
What would it look like on a spectrum analyzer?

Then suppose you have a 1.1 MHz sine wave added
to a 0.9 MHz sine wave.
What would that look like on an oscilloscope?
What would that look like on a spectrum analyzer?

snip, Snip. SNIP ! the "Rec.Radio.Shortwave" Group from the Newsgroups {Distribution} Header - please, Please. PLEASE !
 

On Mon, 02 Jul 2007 14:42:49 -0700, RHF
wrote:

On Jul 2, 6:16 am, Don Bowey wrote:
On 7/1/07 10:06 PM, in article
,

"Telamon" wrote:
In article ,
cledus wrote:

Snip

Would you please have the decency to snip rec.radio.shortwave and other
groups from the newsgroup header. Thanks.

- Would you please come and ask nicely.
- I don't like how you put your order.

don bowey, Don Bowey. DON BOWEY !

Oh Please with Sugar and Spice and Everything Nice
snip, Snip. SNIP ! the "Rec.Radio.Shortwave" Group
from the Newsgroups {Distribution} Header when you
Post your Reply - It would be ever so decent of you
Kind and Wonder Sir. ;-)

thank you very much - most respectfully ~ RHF

---
Seems to me his posts are on topic for rrs, so why don't you just
learn how to use a filter?


--
JF