[Milsurplus] FW: New MF Amateur Band Approved at WRC - 472 to 479 kHz

[k2cby]

  _____  

From: k2cby [mailto:k2cby at optonline.net] 
Sent: February 16, 2012 17:39
To: Military Surplus (milsurplus at mailman.qth.net)
Subject: New MF Amateur Band Approved at WRC - 472 to 479 kHz

 

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Has anybody got any practical suggestions to translate the radiated power
limits into practical terms?

 

These frequencies lie in the old 600 meter marine band.

Most of the shipboard transmitters ran about 100 to 200 watts output.

With respect to antennas, the usual rig would have been a single horizontal
wire anywhere 
between 150 and 250 feet long (about 1/4 wavelength), depending on the size
of the vessel.

A steel hull ship sailing in salt water would have provided a nearly ideal
ground.

 

Assuming I use a horizontal wire antenna about 1/4 wave long over a
decidedly less than 
perfect ground, what kind of power output  would be legal?

 

As luck would have it, I just acquired a Mackay Marine model 3001-a regen,
so I've got a receiver.

 

The transmitter is another matter entirely.

 

Old time marine transmitters, BC-375 Transmitters and TU-26B tuning units
are as scarce as hen's 
teeth, and I can't see myself acquiring an AM broadcast transmitter - not to
mention the fact that coils 
and capacitors would have to scaled up by a factor of about 1.17.

 

Fortunately, modern ferrite and powdered iron cores will make the coil
winding easier.

 

I am looking for ideas, pending the day when the band will actually be
available.

 

Anybody want to work with me?

 

Miles B. Anderson, K2CBY
16 Round Pond Lane
Sag Harbor, NY 11963
Tel.: (631) 725-4400

Fax.: (631) 725-2223
e-mail: k2cby at optonline.net