From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= <luis@vigilant.es>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: Signal bandwidth in Op32 LF
Thread-Index: AdRXyZMYu8TrhccQQ7KtgQlRrrgkKg==
Date: Sat, 29 Sep 2018 08:06:05 +0000
Message-ID: <6DB8451D7F3D3947A5918808A59621EA08642503@servigilant.vigilant.local>
Accept-Language: es-ES, en-US
Content-Language: es-ES
MIME-Version: 1.0
Subject: LF: Signal bandwidth in Op32 LF
Content-Type: multipart/alternative;
	boundary="_000_6DB8451D7F3D3947A5918808A59621EA08642503servigilantvigi_"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

--_000_6DB8451D7F3D3947A5918808A59621EA08642503servigilantvigi_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Hi LF

I'm puzzled with the readings of bandwidth at the Op32 correlation detectio=
n grabbers

As source I'm using a GPS generated signal, which is coherent in phase and =
works for EbNaut
So I tested this at 20x frequency to drive an small D class PA and modulate=
d in Opera32
The OOK was achieved by enabling/disabling a divider by 10 just after GPS

Sourprisingly, my decodes at DF6NM and DL0AO varied in width, but always sh=
owing width of a non coherent signal

2018-09-24 16:55:09 EA5DOM  1500km 137485.051Hz  71mHz -99.9dBOp  78% 17.6d=
B
2018-09-24 15:35:10 EA5DOM  1500km 137485.026Hz 114mHz -99.9dBOp 100% 17.3d=
B

2018-09-24 14:13:18 EA5DOM  1500km 137485.039Hz 164mHz -37.2dBOp 100% 20.7d=
B

2018-09-27 19:08:06 EA5DOM  1536km 137485.013Hz 110mHz -38.3dBOp  94% 18.8d=
B

Last night I tried without PA.  Using just a mosfet driver this time gettin=
g

about 1W output. The GPS generates the 10x frequency and the OOK is control=
led

by enabling/disabling the divider by 10. Got a couple of decodes at DF6NM

2018-09-29 02:17:39 EA5DOM  1500km 137485.007Hz   5mHz -46.4dBOp  85% 15.4d=
B
2018-09-29 00:37:50 EA5DOM  1500km 137484.986Hz 112mHz -43.2dBOp 100% 19.6d=
B

So, 5 and 112mHz, for the same signal. I'm thinking that the problem is cau=
sed

by glitches when the signal goes off. A synchronous off would be needed to

cut signal at zero crossing ?

Reports to other stations, like SM2DJK, show just 2 to 3mHz


Any ideas ?


PS: Stefan. Your Op32 correlaton detector is not working actually


73 de Luis

EA5DOM


--_000_6DB8451D7F3D3947A5918808A59621EA08642503servigilantvigi_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html dir=3D"ltr">
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" id=3D"owaParaStyle"></style>
</head>
<body fpstyle=3D"1" ocsi=3D"0">
<div style=3D"direction: ltr;font-family: Tahoma;color: #000000;font-size: =
10pt;">Hi LF
<div><br>
</div>
<div>I'm puzzled with the readings of bandwidth at the Op32 correlation det=
ection grabbers</div>
<div><br>
</div>
<div>As source I'm using a GPS generated signal, which is coherent in phase=
 and works for EbNaut</div>
<div>So I tested this at 20x frequency to drive an small D class PA and mod=
ulated in Opera32</div>
<div>The OOK was achieved by enabling/disabling a divider by 10 just after =
GPS</div>
<div><br>
</div>
<div>Sourprisingly, my decodes at DF6NM and DL0AO varied in width, but alwa=
ys showing width of a non coherent signal</div>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">2018-09-24=
 16:55:09 EA5DOM  1500km 137485.051Hz  71mHz -99.9dBOp  78% 17.6dB=0A=
2018-09-24 15:35:10 EA5DOM  1500km 137485.026Hz 114mHz -99.9dBOp 100% 17.3d=
B&nbsp;</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">2018-09-24=
 14:13:18 EA5DOM  1500km 137485.039Hz 164mHz -37.2dBOp 100% 20.7dB</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">2018-09-27=
 19:08:06 EA5DOM  1536km 137485.013Hz 110mHz -38.3dBOp  94% 18.8dB</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">Last night=
 I tried without PA.  Using just a mosfet driver this time getting</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">about 1W o=
utput. The GPS generates the 10x frequency and the OOK is controlled</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">by enablin=
g/disabling the divider by 10. Got a couple of decodes at DF6NM</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">2018-09-29=
 02:17:39 EA5DOM  1500km 137485.007Hz   5mHz -46.4dBOp  85% 15.4dB=0A=
2018-09-29 00:37:50 EA5DOM  1500km 137484.986Hz 112mHz -43.2dBOp 100% 19.6d=
B</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">So, 5 and =
112mHz, for the same signal. I'm thinking that the problem is caused</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">by glitche=
s when the signal goes off. A synchronous off would be needed to</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">cut signal=
 at zero crossing ?</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">Reports to=
 other stations, like SM2DJK, show just 2 to 3mHz</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;"><br></pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">Any ideas =
?</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;"><br></pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">PS: Stefan=
. Your Op32 correlaton detector is not working actually</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;"><br></pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">73 de Luis=
</pre>
<pre style=3D"overflow-wrap: break-word; white-space: pre-wrap;">EA5DOM</pr=
e>
<div>&nbsp;</div>
</div>
</body>
</html>

--_000_6DB8451D7F3D3947A5918808A59621EA08642503servigilantvigi_--