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From: "Jay Rusgrove" <JRusgrove@comcast.net>
To: rsgb_lf_group@blacksheep.org
References: <000201c627fa$e6299570$e6a4c593@RD40002>
Date: Thu, 2 Feb 2006 09:11:39 -0500
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Subject: LF: Re: RE: Re: J310 IMD figures
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<DIV><FONT face=Arial size=2>Jim</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Sorry...probably should have used 'attenuation'
instead of 'gain'...</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>In order to be consistent I used the
same method as the original article:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.arrl.org/tis/info/pdf/0109031.pdf">http://www.arrl.org/tis/info/pdf/0109031.pdf</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face="Times New Roman" size=2>
<P align=left>"Test signals were fed through a 12-pF capacitor to simulate the
source impedance of a 1-meter whip. Referenced to the antenna output, the
following values were measured..."</P>
<P align=left><FONT face=Arial>Jay</FONT></P>
<P align=left> </P>
<P align=left></FONT>----- Original Message ----- </P></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=j.r.moritz@herts.ac.uk href="mailto:j.r.moritz@herts.ac.uk">james
moritz</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=rsgb_lf_group@blacksheep.org
href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, February 02, 2006 8:16
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> LF: RE: Re: J310 IMD
figures</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Dear
Jay,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">How is the -16dB
“gain” defined?</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Cheers, Jim
Moritz</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">73 de
M0BMU</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">-----Original
Message-----<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> <A
href="mailto:owner-rsgb_lf_group@blacksheep.org">owner-rsgb_lf_group@blacksheep.org</A>
[mailto:owner-rsgb_lf_group@blacksheep.org] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Jay Rusgrove<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> 02 February 2006 12:54<BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> <A
href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</A><BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> LF: Re: J310 IMD
figures</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Roelof</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Had an opportunity to build 6 of
the Amrad CP666 e probes (for a military customer) a while back
and measured the following. First column is measurments from the QST
article, second column is measurment average of the 6 antennas built
(all measured within a dB or so of each other), third column Amrad
circuit with single J310 at 12 volts and fourth column single J310 at 24
volts. </SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Measured significantly higher IP2
than the original article leading me to believe there might have been a
measurement error in the original article...or I got a batch of CP666s that
were unusally good performers. The fact that the J310 at 12
volts achieved +50 dBM makes me lean toward possible measurement
error in the original article.</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hope these columns stay lined up
when passing through the reflector! </SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">
Amrad article W1VD
built J310
12volt J310 24
volt<BR>
<BR> <BR>1 dB comp. +25
dBm
+25 dBm +17
dBm +18
dBm<BR> <BR>IP2
+53
dBm*
+60
dBm +50
dBm +60
dBm<BR> <BR>IP3
+37
dBm
+36
dBm +32
dBm +32
dBm</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Gain
-16.7
dB -16.5
dB
-10
dB
-10 dB</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">* possible measurement
error</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Jay, W1VD</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN
style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV></DIV></BLOCKQUOTE></BODY></HTML>