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Parallax
 
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Default cellphones

My posts havent been gittin through fer some reason so I'm gonna
repost this one.

For ppl who really want to stay connected while afloat ( I dunno why
but they do). Useless Idea #3734

Put a T in the output of your VHF so your cellphone can be connected
to your VHF antenna waaaaaaaaay up thar on your mast. Since your 900
Mhz cellphone is even more line-of-sight than vhf, this will give you
more more coverage when you are a few miles out. In this case, I
expect coverage will then be limited by cellphone power instead of by
not being able to see a tower. I would expect to be able to get
coverage from 15 miles out. I once experimented, while standing on my
cabin top, I was able to use my cell phone while being 6 miles
offshore. Would a cell phone booster be illegal?
  #2   Report Post  
Jere Lull
 
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Parallax wrote:

My posts havent been gittin through fer some reason so I'm gonna
repost this one.

For ppl who really want to stay connected while afloat ( I dunno why
but they do). Useless Idea #3734

Put a T in the output of your VHF so your cellphone can be connected
to your VHF antenna waaaaaaaaay up thar on your mast. Since your 900
Mhz cellphone is even more line-of-sight than vhf, this will give you
more more coverage when you are a few miles out. In this case, I
expect coverage will then be limited by cellphone power instead of by
not being able to see a tower. I would expect to be able to get
coverage from 15 miles out. I once experimented, while standing on my
cabin top, I was able to use my cell phone while being 6 miles
offshore. Would a cell phone booster be illegal?


Don't key the VHF if the cell phone is plugged in! In fact, it might not
be a good idea have the VHF on or connected. Doubt it'll help much, if
at all.

There was a good thread maybe a year ago about boosting cellphone
distances. There are both directional antennas and power boosters. Do a
google on Cell phone antennas, as I recall.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

  #4   Report Post  
Jeff Morris
 
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Why don't you just get a cell phone antenna and if needed, an amplifier? With a 4 foot
antenna on the stern rail we had contact with ATT for the entire East Coast. The only
problem area was Maine, where the coves can be blocked by hills.

BTW, one of the proposals for "next generation" cell technology was by a company that
specializes in small supercomputers for Defense Dept. radar and sonar systems. The same
technology that can "aim" radar can be used to aim cell bandwidth to the customer that
needs it at the moment.




"Parallax" wrote in message
om...
(Parallax) wrote in message

. com...
My posts havent been gittin through fer some reason so I'm gonna
repost this one.

For ppl who really want to stay connected while afloat ( I dunno why
but they do). Useless Idea #3734

Put a T in the output of your VHF so your cellphone can be connected
to your VHF antenna waaaaaaaaay up thar on your mast. Since your 900
Mhz cellphone is even more line-of-sight than vhf, this will give you
more more coverage when you are a few miles out. In this case, I
expect coverage will then be limited by cellphone power instead of by
not being able to see a tower. I would expect to be able to get
coverage from 15 miles out. I once experimented, while standing on my
cabin top, I was able to use my cell phone while being 6 miles
offshore. Would a cell phone booster be illegal?



OK, an even worse idea.......Use your radar (I dont have one) as a
high gain antenna to point toward a cell tower. It ought to work for
900 Mhz. Some electronics could figger out the direction to the best
tower.



  #5   Report Post  
L. M. Rappaport
 
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On Tue, 28 Oct 2003 09:02:16 -0500, "Jeff Morris"
jeffmo@NoSpam-sv-lokiDOTcom wrote (with possible editing):

Why don't you just get a cell phone antenna and if needed, an amplifier? With a 4 foot
antenna on the stern rail we had contact with ATT for the entire East Coast. The only
problem area was Maine, where the coves can be blocked by hills.

BTW, one of the proposals for "next generation" cell technology was by a company that
specializes in small supercomputers for Defense Dept. radar and sonar systems. The same
technology that can "aim" radar can be used to aim cell bandwidth to the customer that
needs it at the moment.


....snip

Actually, what might make more sense are the new satellite cell
phones. I believe they go for around $600, but the per-minute charge
is down to around $0.35 and they're good just about anywhere.
--

Larry
Email to rapp at lmr dot com


  #6   Report Post  
Larry W4CSC
 
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Default cellphones

That's the dumbest thing I've seen in a long time!.....and will
destroy BOTH radio and cellphone....DON'T DO IT!

1 - Antenna will not transmit 800 or 1900 Mhz.....

2 - The transmitter of one radio transmits into the RECEIVER of the
other, destroying its sensitive input amplifier.

3 - The transmitters, themselves, will be operating into such a
complex impedance, it may take out the output amp in the transmitter,
too!

NO GO.......

Don't feel pregnant, though. Today I was helping someone troubleshoot
their electrical problems on a motor yacht. I casually asked him why
his battery charger was connected to his 2000W AC inverter. Without
missing a beat and totally serious, he told me that was to keep his
battery charged when he was at anchor away from the dock.......

Ever seen a perpetual motion machine?.....(c;

I just said, "Oh, I see.".....thinking about how I was gonna get away
from this boat before I found its exhaust riser plugged into the
diesel intakes to conserve air......

Sure hope his head doesn't pump into the fresh water tank....hee hee.

The inverter had plenty of power to run the 30A battery charger
plugged into it, though.....(c;



On 27 Oct 2003 15:39:00 -0800, (Parallax)
wrote:

My posts havent been gittin through fer some reason so I'm gonna
repost this one.

For ppl who really want to stay connected while afloat ( I dunno why
but they do). Useless Idea #3734

Put a T in the output of your VHF so your cellphone can be connected
to your VHF antenna waaaaaaaaay up thar on your mast. Since your 900
Mhz cellphone is even more line-of-sight than vhf, this will give you
more more coverage when you are a few miles out. In this case, I
expect coverage will then be limited by cellphone power instead of by
not being able to see a tower. I would expect to be able to get
coverage from 15 miles out. I once experimented, while standing on my
cabin top, I was able to use my cell phone while being 6 miles
offshore. Would a cell phone booster be illegal?



Larry W4CSC

"Very funny, Scotty! Now, BEAM ME MY CLOTHES! KIRK OUT!"

  #8   Report Post  
Parallax
 
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Default cellphones

Rodney Myrvaagnes wrote in message . ..
On 27 Oct 2003 15:39:00 -0800, (Parallax)
wrote:

My posts havent been gittin through fer some reason so I'm gonna
repost this one.

For ppl who really want to stay connected while afloat ( I dunno why
but they do). Useless Idea #3734

Put a T in the output of your VHF so your cellphone can be connected
to your VHF antenna waaaaaaaaay up thar on your mast. Since your 900
Mhz cellphone is even more line-of-sight than vhf, this will give you
more more coverage when you are a few miles out. In this case, I
expect coverage will then be limited by cellphone power instead of by
not being able to see a tower. I would expect to be able to get
coverage from 15 miles out. I once experimented, while standing on my
cabin top, I was able to use my cell phone while being 6 miles
offshore. Would a cell phone booster be illegal?


I have seen boosters advertised for some cell phones.

As for the VHF antenna, if it does come out to a multiple of the cell
antenna its gain would be so high, and its vertical angle so narrow,
that it couldn't be used in anything but dead flat calm, with no
ground swell. There is also the little problem of impedance matching
and coupling the phone to the coax.

The booster seems likelier to work.



Rodney Myrvaagnes NYC J36 Gjo/a

"Religious wisdom is to wisdom as military music is to music."



I never said I had good ideas. However, I realize that somehow you
better disconnect the connection when the VHF or radar is used. I
also forgot about impedance matching (my god, alzheimers, I taught an
engineering lab on impedance matching once). I really don't know how
a radar antenna works on small boats. If it is just a rotating dish,
it oughta work with the right transducer.
  #10   Report Post  
Jim Richardson
 
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Default cellphones

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Tue, 28 Oct 2003 16:18:57 -0500,
Rodney Myrvaagnes wrote:
On 28 Oct 2003 05:05:13 -0800, (Parallax)
wrote:


I never said I had good ideas. However, I realize that somehow you
better disconnect the connection when the VHF or radar is used. I
also forgot about impedance matching (my god, alzheimers, I taught an
engineering lab on impedance matching once). I really don't know how
a radar antenna works on small boats. If it is just a rotating dish,
it oughta work with the right transducer.



The kind with a dome has a printed-circuit board with an array of
little antenna elements with fixed phase relationship that produces
the beam and receives the echoes. The open ones are slotted wave
guides AFIK. I don't see how either would help a cell phone.


If they were the right freq, it would work, at least the antenna part.
Still have to deal with impedence issues.

The slotted wavguide type, are called "Alford" antenna's and they
basically act like an array of verticle dipoles. Except they are
horizontally polarized. The PCB looking ones, are microstrip patch
arrays.

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--
Jim Richardson
http://www.eskimo.com/~warlock
Think for yourselves and allow others the privilege to do the same.
- Voltare


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