Long wave again.

[Brian Gaff]

So the long wave band is seemingly full of blank carriers, and has been
going that way for some years. What are all these stations? They must be
quite powerful, and if you beat a bfo with them you can hear on many low bit
rate frequency shift keying going on. So this must still be used by
somebody. Seems a big wast of a transmitter.
Brian

[charles]

Post by Brian Gaff
So the long wave band is seemingly full of blank carriers, and has been
going that way for some years. What are all these stations? They must be
quite powerful, and if you beat a bfo with them you can hear on many low
bit rate frequency shift keying going on. So this must still be used by
somebody. Seems a big wast of a transmitter. Brian

Possibly Russia, because of the size of the country

[Brian Gaff]

I wondered if it was a cheap way to move data one way. Have you listened, it
sounds a bit like RTTY.
I have no way of decoding the frequency shifts as they are small and lower
than the ear can hear and only notice if you beat a signal with them and
narrow the bandwidth. These are very strong, and they are not, I think, from
Russia.
Brian
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Post by charles

Post by Brian Gaff
So the long wave band is seemingly full of blank carriers, and has been
going that way for some years. What are all these stations? They must be
quite powerful, and if you beat a bfo with them you can hear on many low
bit rate frequency shift keying going on. So this must still be used by
somebody. Seems a big wast of a transmitter. Brian

Possibly Russia, because of the size of the country
--
from KT24 in Surrey, England - sent from my RISC OS 4té
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle

[Rink]

Post by Brian Gaff
So the long wave band is seemingly full of blank carriers, and has
been going that way for some years. What are all these stations? They
must be quite powerful, and if you beat a bfo with them you can hear
on many low bit rate frequency shift keying going on. So this must
still be used by somebody. Seems a big wast of a transmitter. Brian

I only know 162 kHz Allouis (France).
It's for clocks, as far as I know.
It is 800 kW (!).
But they will reduce it to 300 kW.
Still a lot of energy.....

Do you hear more blank carriers?

Rink

[Woody]

Post by Rink

Post by Brian Gaff
So the long wave band is seemingly full of blank carriers, and has
been going that way for some years. What are all these stations? They
must be quite powerful, and if you beat a bfo with them you can hear
on many low bit rate frequency shift keying going on. So this must
still be used by somebody. Seems a big wast of a transmitter. Brian

I only know 162 kHz Allouis (France).
It's for clocks, as far as I know.
It is 800 kW (!).
But they will reduce it to 300 kW.
Still a lot of energy.....
Do you hear more blank carriers?

I think Allouis is now only a frequency standard. I did carry the TDF
time data (don't know if it still does) but its interesting that
anything commonly available - such as digital clocks - only ever seem to
use MSF on 60khz or DCF on 77.5khz? Maybe TDF is only used in France?

[Scott]

On Wed, 7 Jun 2023 18:09:19 +0100, Woody <***@ntlworld.com>
wrote:
[snip]

Post by Woody

Post by Rink
Do you hear more blank carriers?

I think Allouis is now only a frequency standard. I did carry the TDF
time data (don't know if it still does) but its interesting that
anything commonly available - such as digital clocks - only ever seem to
use MSF on 60khz or DCF on 77.5khz? Maybe TDF is only used in France?

I believe Kalundborg is or was news and shipping forecasts only:
https://en.wikipedia.org/wiki/Kalundborg_Transmitter

Would this mean a blank carrier for the rest of the time?

[Rink]

Post by Scott
[snip]

Post by Woody

Post by Rink
Do you hear more blank carriers?

I think Allouis is now only a frequency standard. I did carry the TDF
time data (don't know if it still does) but its interesting that
anything commonly available - such as digital clocks - only ever seem to
use MSF on 60khz or DCF on 77.5khz? Maybe TDF is only used in France?

https://en.wikipedia.org/wiki/Kalundborg_Transmitter
Would this mean a blank carrier for the rest of the time?

50kW a few hours per day
And the rest of the day a carrier, but only 100 mW....

http://www.mwlist.org/mwlist_quick_and_easy.php?area=1&kHz=243

Rink

[Rink]

Post by Woody

Post by Rink

Post by Brian Gaff
So the long wave band is seemingly full of blank carriers, and has
been going that way for some years. What are all these stations? They
must be quite powerful, and if you beat a bfo with them you can hear
on many low bit rate frequency shift keying going on. So this must
still be used by somebody. Seems a big wast of a transmitter. Brian

I only know 162 kHz Allouis (France).
It's for clocks, as far as I know.
It is 800 kW (!).
But they will reduce it to 300 kW.
Still a lot of energy.....
Do you hear more blank carriers?

I think Allouis is now only a frequency standard. I did carry the TDF
time data (don't know if it still does) but its interesting that
anything commonly available - such as digital clocks - only ever seem to
use MSF on 60khz or DCF on 77.5khz? Maybe TDF is only used in France?

TDF is only used in France.
Maybe the French speaking parts of Belgium and Switserland?

I thought I read somewhere that thousends of clocks
on railway stations in France use the 162 kHz.
So it's really a thing to switch Allouis off.....

UK use 60 kHz.
Germany and Netherlands use DCF 77,5 kHz.
Both using not so much power as Allouis....

Rink