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

[Ian Wilson]

I believe that the reason for defining power output with reference to an
isotropic radiator is to limit power output. If you have a beam antenna
with 10dB gain, you have to reduce the transmitter output power by
10dB from the 1W that would be allowed if you were using an isotropic
radiator.

73, ian K3IMW

On Thu, Feb 16, 2012 at 4:19 AM, C.Whitaker <whitaker at pa.net> wrote:

> de WB2CPN
> There should be some old TU for the BC-191 and 375 around.
> Lot of BC-191 used by USAF for homing beacons.  Did that.
> Put air flow on to the top of the tubes.  Left top cover off.  Two or
> three different AC power supplies available.  The largest one
> was very good, (the one with the tube rectifier for the low voltage
> supply), the other versions were apt to melt in service.
> Breck, you'd think the FCC would have established some kind of
> limitations on the actual antenna.  And, almost anything radiates
> in some direction better that isotropic.
> 73  Clete
>
>
> On 2/15/2012 10:57 AM, B Smith wrote:
> > Reading the fine print below  .  .  .  does this mean we can bump up
> > the EIRP to 5 watts? That would be quite a bit of input power?
> > Perhaps 1 or 2 KW? Looks like some of the ole broadcast transmitters
> > may find their way down to 472-479 Kcs.
> >
> > 73
> > breck
> >
> > 5.A123  The maximum equivalent isotropically radiated power (EIRP) of
> > stations in the Amateur Service using frequencies in the band 472-479
> > kHz shall not exceed 1 W. Administrations may increase this limit of
> > EIRP to 5 W in portions of their territory which are at a distance of
> > more than 800 km from the borders of Algeria, Saudi Arabia,
> > Azerbaijan, Bahrain, Belarus, China, Comoros, Djibouti, Egypt, United
> > Arab Emirates, the Russian Federation, Iran, Iraq, Jordan, Kazakhstan,
> > Kuwait, Lebanon, Libya, Morocco, Mauritania, Oman, Uzbekistan, Qatar,
> > Syrian Arab Republic, Kyrgyzstan, Somalia, Sudan, Tunisia, Ukraine and
> > Yemen. In this frequency band, stations in the Amateur Service shall
> > not cause harmful interference to, or claim protection from, stations
> > of the aeronautical radionavigation service.
> >
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