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Message-ID: <1311082134.82142.YahooMailRC@web111919.mail.gq1.yahoo.com>
Date: Tue, 19 Jul 2011 06:28:54 -0700 (PDT)
From: Daniele Tincani <danieletincani@yahoo.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Morning enhancements of DHO38
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Hi Bill,=0A=0AI also have an HP Pavilion DV6 with the IDT integrated audio =
codec (type =0A92HD75B, in my case). I don't think the MIC input is mono, a=
t least on my PC =0Amodel. It is a dual-use (line/mic) input. Did you try t=
o feed=A0the MIC input on =0Ayour PC=A0from a stereo signal source?=0A=0ABe=
st regards=0ADaniele=0A=0A=0A=0A=0A________________________________=0AFrom:=
 Bill de Carle <ve2iq@magma.ca>=0ATo: rsgb_lf_group@blacksheep.org=0ASent: =
Tue, July 19, 2011 3:08:09 PM=0ASubject: Re: LF: Morning enhancements of DH=
O38=0A=0AWe are still in the midst of a power outage here after a severe st=
orm (100 Km/H =0Awinds) Sunday evening.=A0 It is now 39 hours with no mains=
 power in this area.=A0 I =0Ahave been able to do some comparisons of the M=
ini-Whip vs two series-connected =0Aorthogonal loops favoring Europe.=A0 Bo=
ttom line is both antennas perform well but =0Awhen looking at DHO38 there =
is an estimated 5 dB SNR advantage using the loops.=A0 =0AThat's consistent=
 with the directional gain of the loop configuration.=A0 On both =0Aantenna=
s I see big baseline excursions (+/- 10 dB) lasting about one second.=A0 =
=0ACan't be caused by local QRM because the mains power is off all along th=
e road =0Ahere.=A0 It looks like static crashes.=A0 Apparently I have some =
coupling capacitors =0Ain the preamps which are too large for the frequenci=
es of interest.=A0 There isn't =0Aany visible effect on SL's waterfall beca=
use I'm not displaying such low =0Afrequencies, but I'll be looking into it=
.=A0 Maybe some voltage clipping would =0Aprevent high amplitude static imp=
ulses from having any major effect on the =0Aoutput lines?=A0 Not too serio=
us because everything still stays within the =0Aallowable range for sound c=
ard inputs and there is no clipping.=A0 I'm using an HP =0Anetbook with int=
egrated "IDT High Definition Audio Codec" - unfortunately there =0Ais only =
one audio input available on the netbook (intended for a microphone) and =
=0Ait's mono.=A0 Oh well...=0A=0ABill VE2IQ=0A=0AAt 09:50 PM 7/16/2011, VE2=
IQ wrote:=0A> At 10:21 AM 7/16/2011, Stefan wrote (about Mini-Whip):=0A>> M=
aybe it works near the trees too. The signal level will be reduced, anyway =
it =0A>>might be OK as long as it is well above the soundcards noise. On VL=
F this is =0A>>easily done.=0A> =0A> I found a good spot for the Mini-Whip =
- just above the roof of a garage about =0A>100 feet from the shack.=A0 Did=
n't want to damage the coax jacket so instead of =0A>grounding the shield D=
C-wise I wrapped a bunch of turns of solid copper house =0A>wire around it =
(about a foot along the coax) and grounded that (directly below =0A>the min=
i-whip).=A0 Apparently the capacitive coupling is sufficient but your =0A>m=
ileage may vary.=0A> =0A> I'll let it run overnight updating the grabber.=
=A0 Will replot the DHO38 SNR =0A>tomorrow.
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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></he=
ad><body><div style=3D"font-family:arial, helvetica, sans-serif;font-size:1=
0pt"><DIV>Hi Bill,</DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV>I also have an HP Pavil=
ion DV6 with the IDT integrated audio codec (type 92HD75B, in my case). I d=
on't think the MIC input is mono, at least on my PC model. It is a dual-use=
 (line/mic) input. Did you try to feed&nbsp;the MIC input on your PC&nbsp;f=
rom a stereo signal source?<BR></DIV>=0A<DIV>Best regards</DIV>=0A<DIV>Dani=
ele</DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY:=
 arial, helvetica, sans-serif"><BR>=0A<DIV style=3D"FONT-SIZE: 13px; FONT-F=
AMILY: arial, helvetica, sans-serif"><FONT face=3DTahoma size=3D2>=0A<HR SI=
ZE=3D1>=0A<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Bill de Car=
le &lt;ve2iq@magma.ca&gt;<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN=
></B> rsgb_lf_group@blacksheep.org<BR><B><SPAN style=3D"FONT-WEIGHT: bold">=
Sent:</SPAN></B> Tue, July 19, 2011 3:08:09 PM<BR><B><SPAN style=3D"FONT-WE=
IGHT: bold">Subject:</SPAN></B> Re: LF: Morning enhancements of DHO38<BR></=
FONT><BR>We are still in the midst of a power outage here after a severe st=
orm (100 Km/H winds) Sunday evening.&nbsp; It is now 39 hours with no mains=
 power in this area.&nbsp; I have been able to do some comparisons of the M=
ini-Whip vs two series-connected orthogonal loops favoring Europe.&nbsp; Bo=
ttom line is both antennas perform well but when looking at DHO38 there is =
an estimated 5 dB SNR advantage using the loops.&nbsp; That's consistent wi=
th the directional gain of the loop configuration.&nbsp; On both antennas I=
 see big baseline excursions (+/- 10 dB) lasting about one second.&nbsp; Ca=
n't be
 caused by local QRM because the mains power is off all along the road here=
.&nbsp; It looks like static crashes.&nbsp; Apparently I have some coupling=
 capacitors in the preamps which are too large for the frequencies of inter=
est.&nbsp; There isn't any visible effect on SL's waterfall because I'm not=
 displaying such low frequencies, but I'll be looking into it.&nbsp; Maybe =
some voltage clipping would prevent high amplitude static impulses from hav=
ing any major effect on the output lines?&nbsp; Not too serious because eve=
rything still stays within the allowable range for sound card inputs and th=
ere is no clipping.&nbsp; I'm using an HP netbook with integrated "IDT High=
 Definition Audio Codec" - unfortunately there is only one audio input avai=
lable on the netbook (intended for a microphone) and it's mono.&nbsp; Oh we=
ll...<BR><BR>Bill VE2IQ<BR><BR>At 09:50 PM 7/16/2011, VE2IQ wrote:<BR>&gt; =
At 10:21 AM 7/16/2011, Stefan wrote (about Mini-Whip):<BR>&gt;&gt;
 Maybe it works near the trees too. The signal level will be reduced, anywa=
y it might be OK as long as it is well above the soundcards noise. On VLF t=
his is easily done.<BR>&gt; <BR>&gt; I found a good spot for the Mini-Whip =
- just above the roof of a garage about 100 feet from the shack.&nbsp; Didn=
't want to damage the coax jacket so instead of grounding the shield DC-wis=
e I wrapped a bunch of turns of solid copper house wire around it (about a =
foot along the coax) and grounded that (directly below the mini-whip).&nbsp=
; Apparently the capacitive coupling is sufficient but your mileage may var=
y.<BR>&gt; <BR>&gt; I'll let it run overnight updating the grabber.&nbsp; W=
ill replot the DHO38 SNR tomorrow.<BR><BR><BR></DIV></DIV></div></body></ht=
ml>
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