[Lowfer] multiple transmitters allowed?

[Art]

Thanks John and Lyle!

John, the receiver is an ICOM 745.

The band seems plenty noisey, so it appears to have sensitivity down there.

At 03:38 PM 1/18/04, you wrote:
> >Are we allowed to have multiple transmitters, each running the full legal
> >limit (1 watt)? I would think this is ok, as long as we have separate
> >antennas for each transmitter. Since lowfer transmitters are not licensed,
> >I wonder if they could object to this?
>
>
>To take the last part first, just as a matter of interest, yes they could.
>Under the Communications Act, all intentional radiators require either
>licensing under some radio service, or else certification as compliant with
>Part 15.  The use of unlicensed transmitters is by grace rather than
>birthright.  :>)  And as Lyle cited, there are limits on the number of user
>certified home-built devices one can build before getting into the harder
>(i.e., more expensive) requirements for commercially produced devices.
>
>There is another factor to take into account.  Multiple radiators that are
>part of a single system connected by wire or cable have to be regarded as a
>composite device [Sec. 15.31(h)], which in total has to meet the limits of
>the relevant sections of Part 15 under which it is intended to operate.  So,
>depending what a person is trying to do with multiple transmitters, you
>could end up with (say) five of them, each with input of no more than 0.2W
>and antennas of 10 feet.  I once operated three MedFER transmitters in sync
>as a directional array, but eventually I realized that the way I was driving
>them with a common exciter formed a composite device under these provisions
>and discontinued it.
>
> >I've tried receiving via a 40 meter dipole and a random wire-it doesn't
> >work. I hope to put up a loop in the Spring. I can barely hear the 2 DGPS
> >stations in Maine (and they are within 50 miles of my qth). I'm not sure
> >whether the receiver or the antenna is the problem, maybe a bit of both:>:
>
>
>Could be either, although a sufficiently long random wire in an area of
>minimal electrical noise can be pretty effective.  That suggests perhaps the
>receiver is not as sensitive as it could be.  Many that tune down to
>longwave are half deaf by design.  What kind do you have?  You may be able
>to improve its performance with a preamp, by internal modifications to the
>receiver itself, or by addition of an upconverter.
>
>John D
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