Message-ID: <BAY154-W115D58C8FD0E1466DBD054D35C0@phx.gbl>
From: Lubos OK2BVG <bvgbob@hotmail.com>
To: _RSGB_LF <rsgb_lf_group@blacksheep.org>
Date: Sat, 17 Mar 2012 11:25:39 +0100
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In-Reply-To: <8CED1D568912879-1568-4B17@angweb-usd004.sysops.aol.com>
References: <8CED1D568912879-1568-4B17@angweb-usd004.sysops.aol.com>
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Subject: RE: VLF: MFSK-37 tests above 8970 today
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Hello Markus!I was thinking about a unknown signal on my grabber yesterday.=
 But it is clear now=2C it was you :-) ! I was pleased to see your signal i=
n DFCW 600 and 6000 . GREAT!
73!
Lubos=2C OK2BVG



To: rsgb_lf_group@blacksheep.org
From: markusvester@aol.com
Date: Fri=2C 16 Mar 2012 17:46:42 -0400
Subject: VLF: MFSK-37 tests above 8970 today


To explore the possibility of further two-way VLF contacts from my home ant=
enna=2C I have conducted a test in MFSK-37 mode this morning. I was hoping =
to reach 0.42 mHz ("6000") grabbers using UT-synchronized half-hour dashes.=
 Similar to an earlier kite experiment=2C I used absolute frequency encodin=
g of characters in 1 mHz steps (0 =3D 8970.000=2C 1 =3D 8970.001=2C ... 9 =
=3D 8970.009=2C idle =3D 8970.010=2C A =3D 8970.011=2C .. Z =3D 8970.036 Hz=
).


=20


The plan was to transmit my complete callsign in 2.5 hours between 8:00 and=
 10:30. Unfortunately DHO locking failed during the first two characters=2C=
 which came out some 9 mHz low. Attached image shows what was actually sent=
 according to my "monitor"=2C which is a high harmonic of the transmitted V=
LF signal accidentally aliased into the LF TA window.


=20


I was pleased to find all the dashes showing up clearly as bright dots on t=
he OK2BVG "6000" grabber=2C and even left visible traces in his "600" windo=
w. As I had also received Lubos' transmission last weekend with a good marg=
in in 0.48 mHz=2C a two-way QSO between us would probably be feasible withi=
n a few hours.


=20


Paul Nicholson's 0.278 mHz super-sensitive spectrogram also shows the trans=
mission at 120 degrees azimuth=2C even though the dashes were really too sh=
ort to reach full SNR in this bandwidth.


=20


Results on the DK7C grabber were not quite as good=2C with only a single cl=
ear dot on .006 Hz. This may partly have been due to the previously experie=
nced daytime minimum at our distance (180 km). Nothing distictive was visib=
le at OE3GHB=2C who is at similar distance as OK2BVG=2C but seems to have s=
uffered from a bit of local QRM at the time.=20


=20


Again we find that a great deal is possible with very modest means...


=20


Best 73=2C


Markus (DF6NM)


=20


=20


=20


=20


=20


=20


=20


=20
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>
Hello Markus!<div>I was thinking about a unknown signal on my grabber yeste=
rday. But it is clear now=2C it was you :-) !&nbsp=3B<span style=3D"font-si=
ze: 10pt=3B ">I was pleased to see your signal in DFCW 600 and 6000 . GREAT=
!</span></div><div><br></div><div>73!</div><div><br></div><div>Lubos=2C OK2=
BVG</div><div><br></div><div><br></div><div><br></div><div><br><div><div id=
=3D"SkyDrivePlaceholder"></div><hr id=3D"stopSpelling">To: rsgb_lf_group@bl=
acksheep.org<br>From: markusvester@aol.com<br>Date: Fri=2C 16 Mar 2012 17:4=
6:42 -0400<br>Subject: VLF: MFSK-37 tests above 8970 today<br><br><font col=
or=3D"black" size=3D"2" face=3D"arial">
<div>To explore the possibility of&nbsp=3Bfurther two-way VLF contacts from=
 my home antenna=2C I have conducted a test in MFSK-37 mode this morning. I=
 was hoping to reach 0.42 mHz ("6000") grabbers using UT-synchronized half-=
hour dashes. Similar to an earlier kite experiment=2C I used&nbsp=3Babsolut=
e frequency encoding&nbsp=3Bof characters in 1 mHz steps (0 =3D 8970.000=2C=
 1 =3D 8970.001=2C ... 9 =3D 8970.009=2C idle =3D 8970.010=2C A =3D 8970.01=
1=2C .. Z =3D 8970.036 Hz).</div>


<div>&nbsp=3B</div>


<div>The plan was to transmit my complete callsign in 2.5 hours between 8:0=
0 and 10:30. Unfortunately&nbsp=3BDHO locking failed during the first two c=
haracters=2C which came out&nbsp=3Bsome 9 mHz low. Attached image shows wha=
t was actually sent&nbsp=3Baccording to my "monitor"=2C which is a high har=
monic of the transmitted VLF signal accidentally aliased into the LF TA win=
dow.</div>


<div>&nbsp=3B</div>


<div>I was&nbsp=3Bpleased to find&nbsp=3Ball the dashes showing up clearly =
as bright dots on&nbsp=3Bthe OK2BVG&nbsp=3B"6000" grabber=2C and even left =
visible traces in his "600" window. As I had also&nbsp=3Breceived&nbsp=3BLu=
bos' transmission last weekend with a good margin in 0.48 mHz=2C a two-way =
QSO between us would probably be feasible within a few hours.</div>


<div>&nbsp=3B</div>


<div>Paul Nicholson's 0.278 mHz super-sensitive spectrogram also shows&nbsp=
=3Bthe transmission at 120 degrees azimuth=2C even though the dashes were r=
eally too short&nbsp=3Bto reach full SNR in this bandwidth.</div>


<div>&nbsp=3B</div>


<div>Results on the DK7C grabber were not quite as good=2C with only a sing=
le clear dot on .006 Hz.&nbsp=3BThis may partly&nbsp=3Bhave been due to the=
 previously experienced daytime minimum&nbsp=3Bat our distance (180 km). No=
thing distictive was visible at OE3GHB=2C&nbsp=3Bwho is at similar distance=
 as OK2BVG=2C but seems to have&nbsp=3Bsuffered from a bit of local QRM at =
the time.&nbsp=3B</div>


<div>&nbsp=3B</div>


<div>Again we find that a great deal is possible with very modest means...<=
/div>


<div>&nbsp=3B</div>


<div>Best 73=2C</div>


<div>Markus (DF6NM)</div>


<div>&nbsp=3B</div>


<div>&nbsp=3B</div>


<div>&nbsp=3B</div>


<div>&nbsp=3B</div>


<div>&nbsp=3B</div>


<div>&nbsp=3B</div>


<div>&nbsp=3B</div>


<div>&nbsp=3B</div>
</font></div></div> 		 	   		  </div></body>
</html>=

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