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Date: Sun, 4 Aug 2013 10:02:30 -0400
Message-ID: <CAMFjj72u6XmM=tW1moV87vwYGDvQv0jpbAtKm1pHimx1FZxbFg@mail.gmail.com>
From: Warren Ziegler <wd2xgj@gmail.com>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: USA issued 68 to 76 kHz band with 10 W ERP
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Markus, Stefan, LF,

      Please keep in mind that 10W represents an upper limit, we are free
to run anything below that!

     About Quadcopters - the limitation is the life of the battery - which
is on the order of 15 minutes, even if it could lift enough weight, it
wouldn't last long! (The more weight it must lift the higher the battery
drain!)

     A better solution might be a remote controlled airship (zeppelin)
where the helium supplies the lift and motors provide steering only.


73 Warren K2ORS


On Sun, Aug 4, 2013 at 7:39 AM, Stefan Sch=E4fer <
Stefan.Schaefer@iup.uni-heidelberg.de> wrote:

> **
> Hi Markus,
>
> Am 04.08.2013 09:46, schrieb Markus Vester:
>
>
> Stefan, 10 W ERP is not that hard - anyone who can radiate 80 W ERP on 13=
6
> will be able to do 10 W on half the frequency ;-))
>
> Oh yes indeed. The radiation resistance of the wire is about 1/4 and the
> needed L is about 4x, so the coil losses will be 4x higher too. The groun=
d
> losses may drop a bit. Then it depends on the ratio of coil losses to
> ground losses. So 80W is realistic :-)
>
> I don't know anything about LF propagation on that band. Is it much
> different to 2200m? And what are the distance records?
>
>  Yesterday night a friend showed me his new GPS-stabilized quadrocopter.
> It's stunning how it could just about be parked in midair, despite some
> lateral winds. Seems that would make a great antenna carrier! Not all of
> the neighbour's seemed to enjoy it as much as we did...
>
> MOST interesting! Did you ask him what the weight can be lifted? And will
> it still be stable then? Is it expensive? Do you fear some EMC problems?
> (The topic should be discussed in a new subject then)
>
> 73, Stefan/DK7FC
>
>
> Best 73,
> Markus (DF6NM)
>
>


--=20
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1

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<div dir=3D"ltr">Markus, Stefan, LF,<div><br></div><div>=A0 =A0 =A0 Please =
keep in mind that 10W represents an upper limit, we are free to run anythin=
g below that!</div><div><br></div><div>=A0 =A0 =A0About Quadcopters - the l=
imitation is the life of the battery - which is on the order of 15 minutes,=
 even if it could lift enough weight, it wouldn&#39;t last long! (The more =
weight it must lift the higher the battery drain!)</div>
<div><br></div><div>=A0 =A0 =A0A better solution might be a remote controll=
ed airship (zeppelin) where the helium supplies the lift and motors provide=
 steering only.</div><div><br></div><div><br></div><div>73 Warren K2ORS</di=
v>
<div><br></div><div>=A0=A0</div></div><div class=3D"gmail_extra"><br><br><d=
iv class=3D"gmail_quote">On Sun, Aug 4, 2013 at 7:39 AM, Stefan Sch=E4fer <=
span dir=3D"ltr">&lt;<a href=3D"mailto:Stefan.Schaefer@iup.uni-heidelberg.d=
e" target=3D"_blank">Stefan.Schaefer@iup.uni-heidelberg.de</a>&gt;</span> w=
rote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><u></u>


 =20

<div bgcolor=3D"#ffffff" text=3D"#000000">
Hi Markus, <br>
<br>
Am 04.08.2013 09:46, schrieb Markus Vester:
<div class=3D"im"><blockquote type=3D"cite">
 =20
 =20
  <div>=A0</div>
  <div><font face=3D"Arial">Stefan, 10 W ERP is not that hard -
anyone who can radiate 80 W ERP on 136 will be able to do 10 W=A0on half
the frequency ;-))</font></div>
</blockquote></div>
Oh yes indeed. The radiation resistance of the wire is about 1/4 and
the needed L is about 4x, so the coil losses will be 4x higher too. The
ground losses may drop a bit. Then it depends on the ratio of coil
losses to ground losses. So 80W is realistic :-)<br>
<br>
I don&#39;t know anything about LF propagation on that band. Is it much
different to 2200m? And what are the distance records? <br><div class=3D"im=
">
<br>
<blockquote type=3D"cite">
  <div><font face=3D"Arial"> Yesterday night a friend=A0showed
me=A0his new GPS-stabilized quadrocopter. It&#39;s stunning how it=A0could =
just
about be parked in midair, despite some lateral winds. Seems that would
make a great antenna carrier! Not all of the neighbour&#39;s=A0seemed
to=A0enjoy it=A0as much as we did... </font></div>
</blockquote></div>
MOST interesting! Did you ask him what the weight can be lifted? And
will it still be stable then? Is it expensive? Do you fear some EMC
problems? (The topic should be discussed in a new subject then)<br>
<br>
73, Stefan/DK7FC<br>
<br>
<blockquote type=3D"cite">
  <div>=A0</div>
  <div><font face=3D"Arial">Best 73,</font></div>
  <div><font face=3D"Arial">Markus (DF6NM)</font></div>
</blockquote>
</div>

</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>73 Warren K2=
ORS<br>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XGJ <br>=A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 WD2XSH/23<br>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WE2XEB/2<br>=A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 WE2XGR/1<br><br>=A0
</div>

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