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Date: Mon, 12 Oct 2009 10:39:17 +0100
Message-ID: <1f0624b90910120239u3b2c82fexa0d02251def0797@mail.gmail.com>
From: Gary - G4WGT <g4wgt@tiscali.co.uk>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: RE: 503.6kHz Test
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Hi Jim, LF,
Thank you for the plot & your observations. I have downloaded the plot to
study later.

I had not realised until after the PA FET failure on Saturday night that the
LPF toroids were very hot & need to be upgraded if I am going to run that
level of power again (5 watts ERP about 4 Amps antenna current). I must also
check the matching transformer toroids at the base of the antenna if that is
getting hot also, I may look into the alternative matching (tapped coil)
which you provided documentation & a spreadsheet for a while ago.

Keep up the good work, I am sure that we all appreciate your input, time &
efforts devoted to the hobby.

Cheers,

Gary - G4WGT.





2009/10/11 James Moritz <james.moritz@btopenworld.com>

> Dear Gary, LF Group,
>
> This is what the signal looks like for about 11/2 hours up to 2200utc. The
> red signal is G4WGT, the yellow one is G4JNT's WSPR beacon. The blue line is
> the noise level scaled to about 300Hz bandwidth, to give an idea of the
> audible strength as a CW signal. The plot settings are not ideal to show
> variations in signal level - there are actually short periods where the
> signal fades to inaudibility that don't show up here, but it gives a
> reasonable idea.
>
> G4WGT I think must be mainly sky wave here so presumably the fading is due
> to  different sky-wave paths.  G4JNT is a very stable ground wave signal
> here during the day, so I imagine the fading here is due to the combination
> of ground wave and sky wave.
>
>
> Cheers, Jim Moritz
> 73 de M0BMU
>

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Hi Jim, LF,<div><br></div><div>Thank you for the plot &amp; your observati=
ons. I have downloaded the plot to study later.</div><div><br></div><div>I=
 had not realised until after the PA FET failure on Saturday night that th=
e LPF toroids were very hot &amp; need to be upgraded if I am going to run=
 that level of power again (5 watts ERP about 4 Amps antenna current). I=
 must also check the matching transformer toroids at the base of the anten=
na if that is getting hot also, I may look into the alternative matching=
 (tapped coil) which you provided documentation &amp; a spreadsheet for a=
 while ago.</div>
<div><br></div><div>Keep up the good work, I am sure that we all appreciat=
e your input, time &amp; efforts devoted to the hobby.</div><div><br></div=
><div>Cheers,</div><div><br></div><div>Gary - G4WGT.</div><div><br></div>
<div><br></div><div><br></div><div><br><br><div class=3D"gmail_quote">2009=
/10/11 James Moritz <span dir=3D"ltr">&lt;<a href=3D"mailto:james.moritz@b=
topenworld.com">james.moritz@btopenworld.com</a>&gt;</span><br><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex;">
Dear Gary, LF Group,<br>
<br>
This is what the signal looks like for about 11/2 hours up to 2200utc. The=
 red signal is G4WGT, the yellow one is G4JNT&#39;s WSPR beacon. The blue=
 line is the noise level scaled to about 300Hz bandwidth, to give an idea=
 of the audible strength as a CW signal. The plot settings are not ideal=
 to show variations in signal level - there are actually short periods whe=
re the signal fades to inaudibility that don&#39;t show up here, but it gi=
ves a reasonable idea.<br>

<br>
G4WGT I think must be mainly sky wave here so presumably the fading is due=
 to =A0different sky-wave paths. =A0G4JNT is a very stable ground wave sig=
nal here during the day, so I imagine the fading here is due to the combin=
ation of ground wave and sky wave.<div>
<div></div><div class=3D"h5"><br>
<br>
Cheers, Jim Moritz<br>
73 de M0BMU <br>
</div></div></blockquote></div><br></div>

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