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 <CAL-VeeNA73-H+DOPdDeQ2H+74_F9Tv5gFp6psTXtUVEKWWuv_Q@mail.gmail.com> <1UTCMpy6DA.3Qa4W73pIAl@optiplex980-pc>
In-Reply-To: <1UTCMpy6DA.3Qa4W73pIAl@optiplex980-pc>
From: Alex R7NT <r7nt.73@gmail.com>
Date: Sat, 19 Jan 2019 22:55:52 +0300
Message-ID: <CAL-VeeP79XFgtAKbzWipxmWSuLS-dvFESQXqZihZDF17cqAFtQ@mail.gmail.com>
To: rsgb_lf_group@blacksheep.org, jrusgrove@comcast.net
Subject: Re: LF: EbNaut
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Jay,
This is a good question.
As well as "Is WSPR2 or WSPR15 better?" or "Is DFCW3 or DFCW30 better?"
DFCW10 or DFCW120, "Is OP8 or OP32 better?" etc :))
Successful far reception on 136 for short modes (DFCW3, WSPR2, JT9-1, short
simbols in sec EbNaut etc) is possible with excellent propagation and big
ERP power.
But the fundamental principle remains under all modes:
*"Theoretically, how many times the duration of the parcels is longer,
exactly as many times can be less power. It is necessary that the energy E
of one premise be greater than the average thermal energy (if the noise is
not thermal, then naturally the effective temperature is implied) i.e.
greater than kT, where k is the Boltzmann constant, and T is the
temperature.*
*Energy E can be =E2=80=9Cgained=E2=80=9D either by power or by duration. E=
 =3D Pt "* RA9MB
Not sure of the accuracy of the translation into English - SRI
I believe this is also true for the all-digital mode.
Visual mode (QRSS, DFCW) we are in their heads restore complete information
on the fragments received.
See my best QRB reception (7h long time period) and best QRB transmission
(3h)
http://136.73.ru/news/2006/feb/2006-02-05_WD2XKO_VO1NA_Time.jpg
http://136.73.ru/news/2004/oct/2004-10-02_RU6LA_Time.jpg
How abt QRSS3 or DFCW3 mode in this case?
Transmit longer, but less...
73! Alex R7NT  136.73.ru    AWLF *136.73.ru/h_aw/ <http://136.73.ru/h_aw/>*


=D1=81=D0=B1, 19 =D1=8F=D0=BD=D0=B2. 2019 =D0=B3. =D0=B2 14:36, jrusgrove@c=
omcast.net <jrusgrove@comcast.net>:

> Alex, Riccardo & EbNaut-eers
>
> Unfortunately no copy of either station last night. Alex ...
> understand your TX frequency may have been moving around.
>
> I wonder if a 1 hour transmission is too long for 137 kHz? Recalling
> spectrograms of QRSS going back many years seems to indicate a QSB patter=
n
> of approximately 15 - 30 minutes. Both receptions of IZ7SLZ and IW4DXW (a
> while back) were 'one and done' with no hint of the signal in adjacent ti=
me
> slots ... using 30 minute transmission times. Even DK7FC's normally big
> signal shows big QSB swings from one half hour period to the next. Can't
> help but wonder if 20 or 30 minute transmission periods make better use o=
f
> the QSB characteristics on 136 kHz.
>
> Comments?
>
> Jay W1VD
>

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"lt=
r"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div=
 dir=3D"ltr">Jay,<div>This is a good question.</div><div>As well as &quot;I=
s WSPR2 or WSPR15 better?&quot; or &quot;Is DFCW3 or DFCW30 better?&quot; D=
FCW10 or DFCW120, &quot;Is OP8 or OP32 better?&quot; etc :))</div><div>Succ=
essful far reception on 136 for short modes (DFCW3, WSPR2, JT9-1, short sim=
bols in sec EbNaut etc) is possible with excellent propagation and big ERP =
power.<br></div><div>But the fundamental principle remains under all modes:=
</div><div><div><b>&quot;Theoretically, how many times the duration of the =
parcels is longer, exactly as many times can be less power. It is necessary=
 that the energy E of one premise be greater than the average thermal energ=
y (if the noise is not thermal, then naturally the effective temperature is=
 implied) i.e. greater than kT, where k is the Boltzmann constant, and T is=
 the temperature.</b></div><div><b>Energy E can be =E2=80=9Cgained=E2=80=9D=
 either by power or by duration. E =3D Pt &quot;</b> RA9MB</div></div><div>=
Not sure of the accuracy of the translation into English - SRI<br></div><di=
v>I believe this is also true for the all-digital mode.=C2=A0<br></div><div=
>Visual mode (QRSS, DFCW) we are in their heads restore complete informatio=
n on the fragments received.<br></div><div>See my best QRB reception (7h lo=
ng time period) and best QRB transmission (3h)=C2=A0</div><div><a href=3D"h=
ttp://136.73.ru/news/2006/feb/2006-02-05_WD2XKO_VO1NA_Time.jpg" target=3D"_=
blank">http://136.73.ru/news/2006/feb/2006-02-05_WD2XKO_VO1NA_Time.jpg</a><=
/div><div><a href=3D"http://136.73.ru/news/2004/oct/2004-10-02_RU6LA_Time.j=
pg" target=3D"_blank">http://136.73.ru/news/2004/oct/2004-10-02_RU6LA_Time.=
jpg</a><br></div><div>How abt QRSS3 or DFCW3 mode in this case?</div><div>T=
ransmit longer, but less...<br clear=3D"all"><div><div dir=3D"ltr" class=3D=
"m_9191093799397067331gmail_signature"><div dir=3D"ltr"><div><div dir=3D"lt=
r"><div>73! Alex R7NT =C2=A0<a href=3D"http://136.73.ru" target=3D"_blank">=
136.73.ru</a>=C2=A0 =C2=A0 AWLF <font color=3D"#0000ee"><span style=3D"font=
-size:12.8px"><u><a href=3D"http://136.73.ru/h_aw/" target=3D"_blank">136.7=
3.ru/h_aw/</a></u></span></font></div></div></div></div></div></div><br></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div>=
</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"m_9191093799=
397067331gmail_attr">=D1=81=D0=B1, 19 =D1=8F=D0=BD=D0=B2. 2019 =D0=B3. =D0=
=B2 14:36, <a href=3D"mailto:jrusgrove@comcast.net" target=3D"_blank">jrusg=
rove@comcast.net</a> &lt;<a href=3D"mailto:jrusgrove@comcast.net" target=3D=
"_blank">jrusgrove@comcast.net</a>&gt;:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex">


<div class=3D"m_9191093799397067331gmail-m_-8551827042051803586OECFntDef">
<div>Alex, Riccardo &amp; EbNaut-eers</div>
<div>=C2=A0</div>
<div>Unfortunately no copy of either=C2=A0station last night. Alex ... unde=
rstand=C2=A0your TX frequency may have been moving around.</div>
<div>=C2=A0</div>
<div>I wonder if a 1 hour transmission=C2=A0is too long for 137 kHz?=C2=A0R=
ecalling spectrograms of QRSS going back many years seems to indicate a QSB=
 pattern of approximately 15 - 30 minutes. Both receptions of IZ7SLZ and IW=
4DXW (a while back) were &#39;one=C2=A0and done&#39; with no hint of the si=
gnal in adjacent time slots ... using 30 minute transmission times.=C2=A0Ev=
en=C2=A0DK7FC&#39;s=C2=A0normally big signal shows big QSB swings from one =
half hour period to the next. Can&#39;t help but wonder if 20 or 30 minute =
transmission periods make better use of the QSB characteristics on 136 kHz.=
</div>
<div>=C2=A0</div>
<div>Comments?</div>
<div>=C2=A0</div>
<div>Jay W1VD=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0</div></div>
</blockquote></div></div>

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