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

[Mike Sanders]

500kc was the International distress and calling frequency
for CW. We guarded 500kc observing the silent periods of 15
to 18 minutes and 45 to 48 minutes after the hour as marked
on the radio room clocks. This period was for all stations to
listen for SOS traffic. 500 was also used to call other stations
and move them to 400kc freqs to pass traffic.
500kc and the adjacent 400kc frequencies were a big deal
and usually pretty active at night with maritime traffic of one
kind or another.
2182kc was the voice (AM) counter part frequency with exactly
the same format as 500. Silent periods were to listen for any
MayDay calls.   73

Mike Sanders  K0AZ


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net]On Behalf Of Rob Atkinson
Sent: Saturday, February 18, 2012 6:31 AM
To: Richard Knoppow
Cc: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] New MF Amateur Band Approved at WRC- 472 to
479kHz


500 kc was (is?) the emergency radiomarine frequency; KPH ran rigs up
to 40 KW and that frequency was used for ocean going vessels declaring
an emergency.

Lots of information at http://www.radiomarine.org

73

Rob
K5UJ

On Sat, Feb 18, 2012 at 1:15 AM, Richard Knoppow
<1oldlens1 at ix.netcom.com> wrote:
>
>     When 500khz was still being used by ships I was able to
> hear commercial stations at least 500 miles distant in the
> daytime and much further at night, but these frequencies
> were used mostly for fairly short distance communication,
> the HF bands being used when the ships were at sea.
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