USN Antenna Farm near Cutler Maine ?

USN Antenna Farm near Cutler Maine ?

Post by Michael Babine » Sat, 16 Sep 1995 04:00:00

Hi :

I'm curious if anyone knows what the purpose of the massive antenna farm
is near Cutler Maine, which I believe is US Navy.

The past two summers I have spent some time on Grand Manan Island
(New Brunswick) and have noticed this "farm" on the mainland which
appears to stretch for a few miles. It clearly visible with the *** eye
or low powered binoculars.

My guess is that maybe this is used for communication with submerged subs
(the scale seems about right) other possiblities are some sort of monitoring
station or possibly HF radar.

For someone who lives in a condo with a covenant restricting antennas,
this setup seems like "Ham Heaven".

Michael
VE3WMB
--
++++++++++++++++++++++++++++++++++++++++++++
+ Michael Babineau, Bell Northern Research +
+ Ottawa, Ontario, Canada                  +

++++++++++++++++++++++++++++++++++++++++++++

 
 
 

USN Antenna Farm near Cutler Maine ?

Post by Joe Bu » Sat, 16 Sep 1995 04:00:00


(Clipped)

Quote:>I'm curious if anyone knows what the purpose of the massive antenna farm
>is near Cutler Maine, which I believe is US Navy. My guess is that maybe this is used for communication with submerged subs
>(the scale seems about right)

You are correct. The call sign is NAA.  The operating frequency is
24KHz.  The modulation is MSK.  All of this info is contained in the
Shortwave Directory, Grove, ISBN 0-944543-00-6.

The Jasik and Johnson Antenna Engineering Handbook, Second Edition,
Table 24-1 published by  Mc Graw Hill ISBN0-07-032291-0 gives the
following information about these antennas:
1 megawatt at 17.8KHz.

I don't know which reference is correct but you get the idea.  The USN
has been experimenting with direct satellite communications to
submarines using high-speed bursts to a small Ku-band antenna that is
extended to the surface similar to a periscope.  The data rates
available will likely make this the medium of choice soon.  The VLF
links will likely continue to serve subs that are deeply submerged.
__________________________________________________

Joe Buch - N2JB
Editor - Technical Topics - NASWA Journal
***ia Beach, ***ia
________________________________________

 
 
 

USN Antenna Farm near Cutler Maine ?

Post by Tom Bruh » Tue, 19 Sep 1995 04:00:00


: (Clipped)

: >I'm curious if anyone knows what the purpose of the massive antenna farm
: >is near Cutler Maine, which I believe is US Navy. My guess is that maybe this is used for communication with submerged subs
: >(the scale seems about right)
: You are correct. The call sign is NAA.  The operating frequency is
: 24KHz.  The modulation is MSK.  All of this info is contained in the
: Shortwave Directory, Grove, ISBN 0-944543-00-6.

: The Jasik and Johnson Antenna Engineering Handbook, Second Edition,
: Table 24-1 published by  Mc Graw Hill ISBN0-07-032291-0 gives the
: following information about these antennas:
: 1 megawatt at 17.8KHz.

: I don't know which reference is correct but you get the idea.  The USN
: has been experimenting with direct satellite communications to
: submarines using high-speed bursts to a small Ku-band antenna that is
: extended to the surface similar to a periscope.  The data rates
: available will likely make this the medium of choice soon.  The VLF
: links will likely continue to serve subs that are deeply submerged.

Apparently they have changed frequency to the 24kHz range.  There is a
similar (?)  station about a wavelength from here, the Jim Creek Naval
Transmitting Station, which as I understand also moved from a slightly
lower frequency.  These things aren't exactly frequency-agile, since the
antenna tuning is rather critical and done with rather large coils.  I
believe they can operate anywhere in about a 10kHz range, with
appropriate retuning.  At 1 megawatt, it makes for a rather high voltage
at the base of the antenna(s).  At Jim Creek, there are half a dozen "T"
shaped antennas strung out in a line following the valley below the
transmitting shack, and another half dozen above.  Each "T" is something
like 3000 feet high and 3000 feet across the top, suspended between
parallel mountain ranges that are about 8000 feet apart.  The
transmitter is actually two half megawatt transmitters in phase.  Each
has a push-pull pair of tubes in the output.

Perhaps I'm wrong, but my impression is that they communicate information
quite slowly--a very low baud rate.  Their purpose seems to be to tell a
sub that they need to put up an antenna to get more info, or similar
pre-arranged signals.  Just how much information can you push through a
very high Q antenna system with a 20kHz center frequency??

73, K7ITM

 
 
 

USN Antenna Farm near Cutler Maine ?

Post by linvi.. » Tue, 19 Sep 1995 04:00:00

I think that it is a VLF (10 kHz or so) transmitting station for the USN.
VLF can penetrate water to some depth and the large navies of theworld
use it to send messages to their submerged subs. The bandwidth is
something terrible and so it takes time to send a long message. But the
submerged subs can trail a long wire underwater to pick up the signals;
no need to surface or to raise an antenna on a mast above the water where
pesky planes, satellities and ships can see the wake.

Geologists and geophysicists also use the signals for prospecting for ore
bodies since the signals penetrate the earth a great depth too. The
presence of a conductive mass (ideally an ore body, but in my experience
a fault, a very deep section of swamp or some other geological feature)
will change the field>. When I was working in the Arctic we used Cutler
and one other US VLF station for this.

73 VE6BEQ

 
 
 

USN Antenna Farm near Cutler Maine ?

Post by Bryan Ki » Thu, 28 Sep 1995 04:00:00

Is this the same type of radio system as ELF?

Bryan