[CW] SOS SOS SOS CQ de WOOH - Marine Electric

[D.J.J. Ring, Jr.]

A2 is MCW.  Ship and shore MCW was a modulate AND keyed carrier - in BFO
mode it produced three tones - lower side band, carrier, upper sideband.

I cannot answer your other questions - most likely the instability is due
to the receiver.  Also I have noticed that the operator tuned the receiver
which would vary both the carrier and the sidebands (audio).  Usually the
audio frequency was very stable.

73

David J. Ring, Jr., N1EA <http://www.qsl.net/n1ea/>
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On Fri, Dec 23, 2011 at 5:02 PM, Ken Brown <ken.d.brown at hawaiiantel.net>wrote:

> Hi David,
>
> Thanks for posting that recording. I have a few questions about it. Are
> those signals A2, or MCW? The audio tone frequencies of the signals do
> not seem as stable as amateur CW signals of the same era. Is this due to
> instability of the audio oscillator in the MCW transmitters? Or if it is
> A1, CW is it instability of the RF oscillator in the transmitters? Or
> the LO or BFO in the receiver? Or is it a regenerative receiver?
>
> Thanks,
>
> Ken N6KB
>
>
> R/O David Ring - N1EA wrote:
> > 1983, 500 kHz recording from USCG COMMSTA BOSTON / NMF of SOS de WOOH
> > on 500 kHz.  Albion Lane Radio Officer.
> >
> > A transcript of the decoded Morse Code is also available.  See file:
> > Transcript_SOS_WOOH.txt
> >
> > http://www.archive.org/details/SsMarineElectricWoohSos
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