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Message-ID: <1313347759.61378.YahooMailNeo@web111911.mail.gq1.yahoo.com>
Date: Sun, 14 Aug 2011 11:49:19 -0700 (PDT)
From: Daniele Tincani <danieletincani@yahoo.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
In-Reply-To: <4E480E02.9020706@iup.uni-heidelberg.de>
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Subject: Re: LF: Re: 137 grabbers
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Hello Stefan=0A=C2=A0=0A@Daniele: Nice to read you also want to join in on =
LF! BTW VLF is not forgotten here, i want to come back in September. But wa=
nt to have the LF system ready for the DX season and wat for lower QRN on t=
he Dreamers Band...=0AYou don't have a licence and cannot TX? Wouldn't it b=
e worth to learn for a licence for that reason? :-)=0AAnd have you done fur=
ther tests on sferics and so on your remote VLF QTH? Any news?=0AJust got r=
e-fascinated by John/F5VLF about the earth antenna stuff and want to do mor=
e experiments on that antenna again but LF improvements are very time consu=
ming! But i have holidays now :-))) I am curious how the earth antenna perf=
orms as a RX antenna on 137 kHz (directional pattern and gain and noise). A=
s a TX antenna i will be to lossy i think and its not worth the effort carr=
ying 100s of kg of batteries on the hill for doing some CQ calls that are n=
ot answered....=0A=0AI'm afraid that I have caused a little misunderstandin=
g :-) I'm not planning to join LF as a tx station, I think that=C2=A0I will=
 remain a radio listener with some special interest for low frequencies (fo=
r example NDBs). Probably I could get a licence with a reasonabe effort (af=
ter all, I still have a degree in electronics), but frankly speaking it doe=
s not attracts me very much to tx. As for VLF, my conclusion has been that =
rx conditions at my QTH are such as to suggest to give up with further test=
s. Now I'm building this wideband loop (with the M0AYF-derived amplifier) h=
oping it will match well with my SDR receiver as a wideband rx system, at l=
east at MW and lower HF.=0A=C2=A0=0ABest regards=0ADaniele=0A=C2=A0=0A=0A=
=0AFrom: Stefan Sch=C3=A4fer <Stefan.Schaefer@iup.uni-heidelberg.de>=0ATo: =
rsgb_lf_group@blacksheep.org=0ASent: Sunday, August 14, 2011 8:03 PM=0ASubj=
ect: Re: LF: Re: 137 grabbers=0A=0A=0A Minto, Daniele, =0A=0A@Daniele: Nice=
 to read you also want to join in on LF! BTW VLF is not=0Aforgotten here, i=
 want to come back in September. But want to have the=0ALF system ready for=
 the DX season and wat for lower QRN on the Dreamers=0ABand...=0AYou don't =
have a licence and cannot TX? Wouldn't it be worth to learn=0Afor a licence=
 for that reason? :-)=0AAnd have you done further tests on sferics and so o=
n your remote VLF=0AQTH? Any news?=0AJust got re-fascinated by John/F5VLF a=
bout the earth antenna stuff and=0Awant to do more experiments on that ante=
nna again but LF improvements=0Aare very time consuming! But i have holiday=
s now :-))) I am curious how=0Athe earth antenna performs as a RX antenna o=
n 137 kHz (directional=0Apattern and gain and noise). As a TX antenna i wil=
l be to lossy i think=0Aand its not worth the effort carrying 100s of kg of=
 batteries on the=0Ahill for doing some CQ calls that are not answered....=
=0A=0A@Minto:=0AAm 14.08.2011 19:33, schrieb Minto Witteveen: =0AAbove 10 M=
Hz the gain drops off rapidly, it is nearly=0Auseless at 14 MHz. a -77 type=
 would be much worse there I think.=0A>    =0ASure. I just talked about LF =
now. I read the -43 type is suitable for=0A40...400 MHz, at least this is s=
aid in the catalog...=0A=0AAs for the Q: I did a comparison between an FT50=
-43 and=0Aa 14 mm 4C6 (for my 137 KHz low-pass filter, see my website). The=
 Q of=0Athe FT50-43 coil was abt 50, the 4C6 =E2=80=93 with a lower Al - wa=
s 140 !!    =0AInteresting! 140 at which L? I am searching for ferrite core=
s to=0Aachieve a high Q on LF, in the range of 100...1000uH. Where can i ge=
t=0Athese cores? At RS? Where do you buy them? They are usually samller,=0A=
cheaper and easier to handle than pot cores.=0A=0ABTW what do you think abo=
ut a ferrite RX antenna for LF? Now i'm=0Aopening an older discussion i exp=
ect ;-)=0A=0A73, Stefan/DK7FC
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ar=
ial, helvetica, sans-serif;font-size:10pt"><div><span>Hello Stefan</span></=
div><div><span></span>&nbsp;</div><div><span><em>@Daniele: Nice to read you=
 also want to join in on LF! BTW VLF is not forgotten here, i want to come =
back in September. But want to have the LF system ready for the DX season a=
nd wat for lower QRN on the Dreamers Band...<br>You don't have a licence an=
d cannot TX? Wouldn't it be worth to learn for a licence for that reason? :=
-)<br>And have you done further tests on sferics and so on your remote VLF =
QTH? Any news?<br>Just got re-fascinated by John/F5VLF about the earth ante=
nna stuff and want to do more experiments on that antenna again but LF impr=
ovements are very time consuming! But i have holidays now :-))) I am curiou=
s how the earth antenna performs as a RX antenna on 137 kHz (directional pa=
ttern and gain and noise). As a TX antenna i will be to lossy i think
 and its not worth the effort carrying 100s of kg of batteries on the hill =
for doing some CQ calls that are not answered....<br></em></span></div><div=
><span>I'm afraid that I have caused a little misunderstanding :-) I'm not =
planning to join LF as a tx station, I think that&nbsp;I will remain a radi=
o listener with some special interest for low frequencies (for example NDBs=
). Probably I could get a licence with a reasonabe effort (after all, I sti=
ll have a degree in electronics), but frankly speaking it does not attracts=
 me very much to tx. As for VLF, my conclusion has been that rx conditions =
at my QTH are such as to suggest to give up with further tests. Now I'm bui=
lding this wideband loop (with the M0AYF-derived amplifier) hoping it will =
match well with my SDR receiver as a wideband rx system, at least at MW and=
 lower HF.</span></div><div><span></span>&nbsp;</div><div><span>Best
 regards</span></div><div><span>Daniele</span></div><div><span>&nbsp;</div>=
<div><br></div></span><div><br></div><div style=3D"font-family: arial, helv=
etica, sans-serif; font-size: 10pt;"><div style=3D"font-family: times new r=
oman, new york, times, serif; font-size: 12pt;"><font size=3D"2" face=3D"Ar=
ial"><div style=3D"margin: 5px 0px; padding: 0px; border: 1px solid rgb(204=
, 204, 204); height: 0px; line-height: 0; font-size: 0px;" class=3D"hr" con=
tentEditable=3D"false" readonly=3D"true"></div><b><span style=3D"font-weigh=
t: bold;">From:</span></b> Stefan Sch=C3=A4fer &lt;Stefan.Schaefer@iup.uni-=
heidelberg.de&gt;<br><b><span style=3D"font-weight: bold;">To:</span></b> r=
sgb_lf_group@blacksheep.org<br><b><span style=3D"font-weight: bold;">Sent:<=
/span></b> Sunday, August 14, 2011 8:03 PM<br><b><span style=3D"font-weight=
: bold;">Subject:</span></b> Re: LF: Re: 137 grabbers<br></font><br><meta c=
ontent=3D"off" http-equiv=3D"x-dns-prefetch-control"><div id=3D"yiv39118581=
3">=0A=0A=0A  =0A=0A =0AMinto, Daniele, <br>=0A<br>=0A@Daniele: Nice to rea=
d you also want to join in on LF! BTW VLF is not=0Aforgotten here, i want t=
o come back in September. But want to have the=0ALF system ready for the DX=
 season and wat for lower QRN on the Dreamers=0ABand...<br>=0AYou don't hav=
e a licence and cannot TX? Wouldn't it be worth to learn=0Afor a licence fo=
r that reason? :-)<br>=0AAnd have you done further tests on sferics and so =
on your remote VLF=0AQTH? Any news?<br>=0AJust got re-fascinated by John/F5=
VLF about the earth antenna stuff and=0Awant to do more experiments on that=
 antenna again but LF improvements=0Aare very time consuming! But i have ho=
lidays now :-))) I am curious how=0Athe earth antenna performs as a RX ante=
nna on 137 kHz (directional=0Apattern and gain and noise). As a TX antenna =
i will be to lossy i think=0Aand its not worth the effort carrying 100s of =
kg of batteries on the=0Ahill for doing some CQ calls that are not answered=
....<br>=0A<br>=0A@Minto:<br>=0AAm 14.08.2011 19:33, schrieb Minto Wittevee=
n:=0A<blockquote type=3D"cite">=0A  <div dir=3D"ltr">=0A  <div style=3D'col=
or: rgb(0, 0, 0); font-family: "Arial"; font-size: 10pt;'>=0A  <div>=0A  <d=
iv style=3D"margin: 0in 0in 10pt;" class=3D"yiv391185813MsoNormal"><font si=
ze=3D"3"><font face=3D"Calibri">Above 10 MHz the gain drops off rapidly, it=
 is nearly=0Auseless at 14 MHz. a -77 type would be much worse there I thin=
k.<br>=0A  </font></font></div>=0A  </div>=0A  </div>=0A  </div>=0A</blockq=
uote>=0ASure. I just talked about LF now. I read the -43 type is suitable f=
or=0A40...400 MHz, at least this is said in the catalog...<br>=0A<blockquot=
e type=3D"cite">=0A  <div dir=3D"ltr">=0A  <div style=3D'color: rgb(0, 0, 0=
); font-family: "Arial"; font-size: 10pt;'>=0A  <div>=0A  <div style=3D"mar=
gin: 0in 0in 10pt;" class=3D"yiv391185813MsoNormal"><font size=3D"3"><font =
face=3D"Calibri">As for the Q: I did a comparison between an FT50-43 and=0A=
a 14 mm 4C6 (for my 137 KHz low-pass filter, see my website). The Q of=0Ath=
e FT50-43 coil was abt 50, the 4C6 =E2=80=93 with a lower Al - was 140 !!</=
font></font></div>=0A  </div>=0A  </div>=0A  </div>=0A</blockquote>=0AInter=
esting! 140 at which L? I am searching for ferrite cores to=0Aachieve a hig=
h Q on LF, in the range of 100...1000uH. Where can i get=0Athese cores? At =
RS? Where do you buy them? They are usually samller,=0Acheaper and easier t=
o handle than pot cores.<br>=0A<br>=0ABTW what do you think about a ferrite=
 RX antenna for LF? Now i'm=0Aopening an older discussion i expect ;-)<br>=
=0A<br>=0A73, Stefan/DK7FC<br>=0A<font size=3D"3"><font face=3D"Calibri"><b=
r>=0A</font></font><br>=0A =0A=0A</div><meta content=3D"on" http-equiv=3D"x=
-dns-prefetch-control"><br><br></div></div></div></body></html>
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