[sarcmembers] Re: SARC Tower and Dish move...
- From: Bkitzer@xxxxxxx
- To: sarcmembers@xxxxxxxxxxxxx
- Date: Mon, 11 May 2009 21:08:04 EDT
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Thanks very much for the info, take care, getting antsy foran mc vroom?
Hugh Thompson, KD6PPO
In a message dated 5/11/2009 3:40:30 P.M. Pacific Daylight Time,
pandreasen@xxxxxxxxxxx writes:
Hey guys! When I was the radio puke for the City of Lompoc, I got an
almost identical one for use by the PD during emergencies. (mostly
for hams manning the EOC) For some reason several SWR meters,
including a Bird 43, would not give me a very good reading on any
frequency. I knew it WAS working ok, but didn't see it! I finally
used an MFJ-269 and it showed good impedance and fair SWRs. The ONLY
thing that said it was resonant (in little skips, looked like a
sawtooth plotted out) was an AEA 140-525! I had to sell it after
being laid of as head Engineer of Hendry Telephone Products R&D down
in Goleta. Wish I still had it. I think it was the only instrument I
ever used that was always right, and seemed impervious to some
problems, like others. With a log periodic, you can have a fine
impedance match at a frequency, and still show a horrible SWR, even
though it really is working right. there are so many harmonics that
are being reflected back and forth along with the primary signal,
that you have a mixing, of third order on to infinity! (and beyond!
Quiet, Buzz!)
If anyone has an AEA available to borrow, that should give you real
world readings. I have an MFJ-269, but don't completely trust it on a
log periodic with it's literally thousands of harmonic balances and
unbalances. Even John Kraus, in "Antennas", which most commercial and
ham related folks consider the "antenna Bible" says that log periodic
performance can only be measured as tested ERP (new term, same
meaning as his, he said tested at a distance relative to known
sources), rather than at the feed point.
Just my 2 cents worth.
Paul Andreasen, K1JAN
ARRL Technical Coordinator, Santa Barbara Section
ARRL Technical Advisor, Southwestern Division
SARC Chair Holderdowner
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<DIV><EM><FONT size=3D4>THANKS VERY MUCH FOR THE INFO, TAKE CARE, GETTING=
ANTSY
FORAN MC VROOM?</FONT></EM></DIV>
<DIV> </DIV>
<DIV><FONT lang=3D0 face=3DArial size=3D4 FAMILY=3D"SANSSERIF" PTSIZE=3D"1=
4">Don't take
your organs to heaven, heaven knows we need them here.<BR><BR>Support the=
1st
and 2nd Amendments.<BR><BR>Need info, 805-588-1320.
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/11/2009 3:40:30 P.M. Pacific Daylight Time,
pandreasen@xxxxxxxxxxx writes:</DIV>
<BLOCKQUOTE
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT
style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Hey
guys! When I was the radio puke for the City of Lompoc, I got an <BR>alm=
ost
identical one for use by the PD during emergencies. (mostly <BR>for hams=
manning the EOC) For some reason several SWR meters, <BR>including a Bir=
d 43,
would not give me a very good reading on any <BR>frequency. I knew it WA=
S
working ok, but didn't see it! I finally <BR>used an MFJ-269 and it show=
ed
good impedance and fair SWRs. The ONLY <BR>thing that said it was resona=
nt (in
little skips, looked like a <BR>sawtooth plotted out) was an AEA 140-525=
! I
had to sell it after <BR>being laid of as head Engineer of Hendry Teleph=
one
Products R&D down <BR>in Goleta. Wish I still had it. I think it was=
the
only instrument I <BR>ever used that was always right, and seemed imperv=
ious
to some <BR>problems, like others. With a log periodic, you can have a=
fine
<BR>impedance match at a frequency, and still show a horrible SWR, even=
<BR>though it really is working right. there are so many harmonics that=
<BR>are being reflected back and forth along with the primary signal, <B=
R>that
you have a mixing, of third order on to infinity! (and beyond! <BR>Quiet=
,
Buzz!)<BR>If anyone has an AEA available to borrow, that should give you=
real
<BR>world readings. I have an MFJ-269, but don't completely trust it on=
a
<BR>log periodic with it's literally thousands of harmonic balances and=
<BR>unbalances. Even John Kraus, in "Antennas", which most commercial an=
d
<BR>ham related folks consider the "antenna Bible" says that log periodi=
c
<BR>performance can only be measured as tested ERP (new term, same <BR>m=
eaning
as his, he said tested at a distance relative to known <BR>sources), rat=
her
than at the feed point.<BR>Just my 2 cents worth.<BR><BR>Paul Andreasen,=
K1JAN<BR>ARRL Technical Coordinator, Santa Barbara Section<BR>ARRL Techn=
ical
Advisor, Southwestern Division<BR>SARC Chair
Holderdowner<BR><BR>_______________________________________________<BR>Y=
ou
have received this because you are subscribed to<BR>the Satellite Amateu=
r
Radio Club Members Mailing List<BR><BR>To post on the mailing list, simp=
ly
send email to sarcmembers@xxxxxxxxxxxxxx This mailing list will<BR=
>only
accept email from subscribed members so SPAMMERS<BR>will not get your em=
ail
address<BR><BR>To unsubscribe, send an email to
sarcmembers-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject fiel=
d OR
by logging into the Web interface at:
//www.freelists.org/cgi-bin/lsg2.cgi<BR></FONT></BLOCKQUOTE></DIV><=
/FONT></DIV></FONT></BODY></HTML>
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