Hi Markus / Ralph
Vy interesting.
I compared my measurement to this triangle carrier too / using
another ARGO conected to a KiWi SDR in Germany. At the time of my
picture the AM signal faded out.
Now my SDR-IQ is powered "forever" as usual so it is very stable
even not having any sort of temp compensation. Calibration is ok
+/- 0.5Hz. The combo ARGO + HDSDR can be fine tuned to fraction of
Hz using 60KHz signals I receive here after sunset.
Lets see tonight.
73
Marcus
PY2PLL + PY3CRX
GG66rf (near S Paulo - BRA)
Em 10/11/2018 01:07, Markus Vester
escreveu:
Hi
Marcus,
I think you've got it.
I just did another frequency measurement, by
injecting a 1475.990 kHz Rubidium-derived
local carrier into my AM receiver. Ralph's
carrier is at 10.41 Hz (i.e. 1476 kHz +0.41
Hz), with 0.5 Hz sidebands from the
AGC acting on the beeps. I'm also seeing
that triangle carrier, which is probably
from another unidentified broadcast station.
During the night it has been swinging
between -0.12 Hz and + 0.45 Hz with a 15
minute period, and has now moved up very
slightly. Ralph at +0.41 Hz is just inside
the top of the swing, just like the weak
line in your image.
That's an awesome 9943 km then. Ralph, hold
on tight to your coffee cup ;-)
Best 73,
Markus (DF6NM)
-----Ursprüngliche Mitteilung-----
Von: Marcus PY3CRX PY2PLL
<[email protected]>
An: rsgb_lf_group
<[email protected]>;
markusvester <[email protected]>
Verschickt: Sa, 10. Nov. 2018 2:16
Betreff: Re: LF: 1476 kHz AM
Well ... just for
fun ...
I set 2 receivers sharing the same
mini whip: a SDR-IQ and a KiWi
SDR.
On both there is two signals: one
at 1476000, another at 1476260 (I
read somewhere about Iran 260Hz
above).
Using Argo QRSS20 I got two
signatures: one that looks like an
old ovenized xtal osc and a stable
one.
I verified both signals using an
KiWi SDR in Germany too. Of course
that the 1KHz bips are there. But
the same signals are there as
well: the ~85mHz wanderin' carrier
and the 3W one (this one stable,
~400mHz above 1476000)
May be tomorrow I check this again
earlier.
Capture attached. Who knows ...
73
Marcus
PY2PLL + PY3CRX
GG66rf.
Em
09/11/2018 13:05, Markus Vester
escreveu:
Thanks
Tom and Clemens, that's very
nice!
Indeed there are some issues
with GoogleMaps, for example
last time I looked https://sdr.hu/map
didn't show the Kiwi SDR
locations. As Clemens
indicated, http://k7fry.com/grid/?qth=JN59MN21HF
should work. Or in proper
coordinates, the wire antenna
is attached to the tower at 49.546575
N, 11.019437 E.
Best 73,
Markus
-----Ursprüngliche
Mitteilung-----
Von: DK1IS <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Fr, 9. Nov. 2018
14:13
Betreff: Re: LF: 1476 kHz AM
Am
09.11.2018 um 00:39
schrieb Markus Vester:
After the
sad demise of
all LW and MW
broadcasts in
Germany, a
handful of
pioneers came up
who are
operating legal
low-powered
medium wave
stations in the
context of a
radio museum or
for educational
purposes. One of
them is Ralph
(DL2NDO, one of
the participants
in the legendary
Donebach 137 kHz
activation in
2002). He has
obtained a
transmitting
license for 1476
kHz (former
frequency of
Vienna
Bisamberg), built a
3 Watt AM
transmitter, and
with the help of
a small team
raised a
quarterwave antenna
on the
Fraunhofer
premises south
of Erlangen
(JN59MN21HF).
Yesterday they
got on air for
the first time,
running a
preliminary test
transmission
consisting of a
switched 1000 Hz
beeps (one
second on, one
second off,
audio frequency
locked to the RF
carrier). This
pattern will
be continued for
a few days,
before they will
eventually.take
over the audio
from the local
DAB student
radio
"funklust".
The current test
pattern is
relatively easy
to make out in
the noise so it
may be a good
chance for some
DX detections.
At night we've
actually heard
the beeps
on Twente SDR
and a couple of
German
Kiwi-SDRs. But I
guess
using narrowband
signal
processing
techniques, the
carrier and
coherent tones
coud make it
much further.
The carrier
frequency is
derived from an
OCXO and is
currently at
1476000.411 Hz.
Will anyone in
the group take
the challenge?
Best 73,
Markus (DF6NM)
Fb audible signal at
DL0AO (JN59VK)! RX
Perseus, Ant Miniwhip, see
screenshot. Slight
selective QSB. Similar
results with their North
America beverage.
By the way: all programs
using GoogleMaps for
QTH-locator identification
seem to be inactive
because of new Google
restrictions.
73,
Tom, DK1IS
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