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Date: Sat, 7 Jan 2012 07:06:22 -0500
Message-ID: <CABP+t7YYJgwBFKyBmueSNFxOk=iDmT_E+m4ZpORogkPgBGKZiA@mail.gmail.com>
From: "Douglas D. Williams" <kb4oer@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: JA/EU
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Mal, I understand the relevance of what you are saying on HF, and even
medium wave, but could you (or anyone who cares to) give me a brief
explaination, or point me to a source of information, on LF propagation? I
was under the (admittedly simplistic) understanding that, the lower one
goes in frequency, the more the signal propagates via groundwave. I do know
that almost all military installations transmitting in the VLF/LF bands use
vertical antennas (very, very large ones with huge capacity hats). Do
signals at 136 kHz experience "skip" from ionispheric reflection, similar
to HF signals?

Doug KB4OER

On Sat, Jan 7, 2012 at 5:32 AM, mal hamilton <g3kevmal@talktalk.net> wrote:

> **
> LF
> No sigs visible in JA from EU last nite at the peak time, around 2150 z.
> The JA grabber moved freq so not possible to check at 0740z the other peak
> time.
> I think the antenna used for transmitting has some influence on the launch
> angle and distance covered and likewise the type of antenna at the receive
> site. ie low or high angle.
> A vertical TX antenna system as high as possible would produce low angle
> signals, preferable for long haul DX, and low horizontal wires, loops etc
> would produce high angle, ideal for short ranges but not ideal for DX
> although the odd time high angle also does the trick. Large vertical loops
> fed correctly at the side  produce low angles but small vertical loops
> relative to frequency ie LF might be difficult to evaluate.
> de g3kev
>
>
>
>
>

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<div>Mal, I understand the relevance of what you are saying on HF, and even=
 medium wave, but could you (or anyone who cares to) give me a brief explai=
nation, or point me to a source of information, on LF propagation? I was un=
der the (admittedly simplistic) understanding that, the lower one goes in f=
requency, the more the signal propagates via groundwave. I do know that alm=
ost all military installations transmitting in the VLF/LF bands use vertica=
l antennas (very, very large ones with huge capacity hats). Do signals at 1=
36 kHz experience &quot;skip&quot; from ionispheric reflection, similar to =
HF signals?</div>
<div>=A0</div><div>Doug KB4OER<br><br></div><div class=3D"gmail_quote">On S=
at, Jan 7, 2012 at 5:32 AM, mal hamilton <span dir=3D"ltr">&lt;<a href=3D"m=
ailto:g3kevmal@talktalk.net">g3kevmal@talktalk.net</a>&gt;</span> wrote:<br=
><blockquote style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left=
-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid" clas=
s=3D"gmail_quote">
<u></u>





<div bgcolor=3D"#ffffff">
<div><font face=3D"Arial">LF</font></div>
<div><font face=3D"Arial">No sigs visible in JA from EU last nite at the pe=
ak time,=20
around 2150 z. The JA grabber moved freq so not possible to check at 0740z =
the=20
other peak time.</font></div>
<div><font face=3D"Arial">I think the antenna used for transmitting has som=
e=20
influence on the launch angle and distance covered and likewise the type of=
=20
antenna at the receive site. ie low or high angle. </font></div>
<div><font face=3D"Arial">A vertical TX antenna system as high as possible =
would=20
produce low angle signals, preferable for long haul DX, and low horizontal=
=20
wires, loops etc would produce high angle, ideal for short ranges but not i=
deal=20
for DX although the odd time high angle also does the trick. Large vertical=
=20
loops fed correctly at the side=A0=A0produce low angles but small vertical=
=20
loops relative to frequency ie LF might be difficult to evaluate.</font></d=
iv>
<div><font face=3D"Arial">de g3kev</font></div>
<div>=A0</div>
<div><font face=3D"Arial"></font>=A0</div>
<div><font face=3D"Arial"></font>=A0</div>
<div><font face=3D"Arial"></font>=A0</div></div>
</blockquote></div><br>

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