[SOC] MCW, again.

Sat Oct 6 23:34:37 EDT 2018

A keyed pure sine wave into a SSB radio results in A1A emission, not A2.

A2, MCW, or A2A is a carrier with modulating Morse tone, it comes in
two varieties, keyed like ships used and unkeyed like non-directional
beacons (NDB) use.

I said that MCW is supposed to be distracting, that's modern day
purpose, it's wider than CW and makes a heck of a noise as a receiver
with BFO hears 3 tones keyed at the same time.

73
DR
On Sat, Oct 6, 2018 at 11:30 PM Joseph B Cotton <cottonj at gmail.com> wrote:
>
> MCM that is generated by a SSB rig can not be differentiated from a
> standard CW signal. You are talking about an MCM generated by an AM
> transmitter. Playing a pure sine wave audio into a good SSB rig is what I
> am talking about.
> Joe W3TTT
>
> On Sat, Oct 6, 2018 at 4:22 PM D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:
>
> > Keyed MCW is best received with BFO on as you then can also receive the
> > carrier as well.
> >
> > Detection of CW is much more sensitive then AM.  Detecting MCW in CW
> > receive is also better.
> >
> > 73
> >
> > DR
> >
> > On Sat, Oct 6, 2018, 15:12 g4jht <g4jht at eircom.net> wrote:
> >
> > > Remember MCW is just keyed AM,  so you  turn the CIO or BFO off, to
> > > receive it.
> > > You can even pick MCW up on crystal set, were as with CW you just just
> > > gives clicks in the phones.
> > > The Marconi Atlanta main ships receiver I have just bought (manual says
> > > 1967) has a real variable BFO and an off switch for it. Once I have it
> > > powered up I will try some experiments with local MF Aero beacons and
> > > report back what I find if anyone is interested. They sound like 800
> > > cycles without putting an audio frequency counter on it.
> > >
> > > 73, Dave
> > > EI0DB
> > >
> > >
> > > On 10/06/2018 02:47 PM, D.J.J. Ring, Jr. wrote:
> > > > You're right, Joe.
> > > >
> > > > I guess I got carried away with adding 400 Hz to 800 Hz coming up with
> > > 1200
> > > > HZ.  I'd do that on my receiver and it's not the tones transmitted.
> > > >
> > > > 400 Hz tone used to modulate
> > > > a carrier of 500 kHz, you will have carriers at 4,999,600 Hz,
> > > > 5,000,000 Hz and 5,000,400 Hz.
> > > >
> > > > I corrected the typo.
> > > >
> > > > With a wide receiver we heard three tones.
> > > >
> > > > I used bandwidth of about 8 kHz for watchkeeping.
> > > >
> > > > 73
> > > >
> > > > DR
> > > > N1EA
> > > >
> > > >
> > > > On Sat, Oct 6, 2018, 00:19 Joe Pontek Sr <v31jp1957 at gmail.com> wrote:
> > > >
> > > >> This is not completely accurate.
> > > >>
> > > >> An MCW is made up of components determined by the method of
> > generation.
> > > >> If standard AM method
> > > >> with a single tone is used, there will be the carrier and then two
> > side
> > > >> tones, ie. 400 Hz tone used to modulate
> > > >> a carrier of 5,000 kHz, you will have carriers at 4,999,600 Hz,
> > > >> 5,000,000 Hz and 5,000,400 Hz.
> > > >>
> > > >> Now, depending on your receiver's band width, you might hear a single
> > > >> carrier at each frequency, a beat
> > > >> tone od 400 Hz if you hear two carriers at the same time and further
> > > >> mixes with a wider bandwidth.  The
> > > >> beat note(s) is(are) made in your receiver.
> > > >>
> > > >> In the above example, the bandwidth only 800 Hz, not like a single
> > > >> sideband suppressed carrier voice
> > > >> signal of about 2,700 Hz.
> > > >>
> > > >> Too many times, it is a P poor receiver causing garbage you hear on
> > the
> > > >> bands or poorly used receivers
> > > >> by the operators.
> > > >>
> > > >> 73
> > > >>
> > > >> Joe
> > > >> K8JP
> > > >>
> > > >>
> > > >> On 10/5/2018 1:00 PM, D.J.J. Ring, Jr. wrote:
> > > >>> It's horribly wide and intrusive!
> > > >>>
> > > >>> It's about as wide as a SSB signal.
> > > >>>
> > > >>> About 1.2 kHz wide.
> > > >>>
> > > >>> It sounds like three carriers, say tones of 400, 800 and 1200 Hz all
> > > >>> sending the same pulses of Morse.
> > > >>>
> > > >>> 73
> > > >>>
> > > >>> DR
> > > >>> N1EA
> > > >> --
> > > >> Regards, Joe, K8JP/V31JP, Martin & Sidney Pontek
> > > >> 175 Diamond Loch Rd., Apt. 5
> > > >> Gilmer, TX 75644-9374
> > > >> U.S.A.
> > > >> or
> > > >> P.O. Box 280, Dangriga, Stann Creek District
> > > >> (Hopkins Village) Belize
> > > >>
> > > >> 903-204-2318 (My TX cellular)
> > > >> 903-884-5990 (Skype telephone number, Belize & TX)
> > > >> Also, K8JP, member FOC-1743, QCWA-LM21894, OOTC-4607, A1OP,
> > SKCC-3171T,
> > > >> NAQCC-5798, Flying Pig-2819, FISTS-7625CC951, A1C-2299, SOC 1075,
> > 10-10
> > > >> 22977, PG1915841, CW Rag chewers #21,
> > > >> Facebook: Joe Pontek
> > > >> Skype: v31joepalooka
> > > >> I am looking for Vibroplex Model X, Double lever and prefer basket
> > cases
> > > >> to restore.
> > > >> LotW
> > > >>
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