There is no way that impedance matching can be accomplished with changing the
length of the transmission line in a 50 ohm system when the transmission line
used is also of the same characteristic impedance without a compensating shunt
XC or XL stub, at a location determined on a Smith Chart
HOLY CRAP I've been wondering that for some time. Guess the manual
isn't always right. and maybe that's why the GE Z-match is there for the
recruiting of true GE tuners.. Never-mind keeping your PA happy at 100%
DC. I always wanted to ask but never did (for thought of flames from the
GE
Sid, I think I found your formula. Look on page 62 of:
http://www.repeater-builder.com/antenna/pdf/ve2azx-duplexerinfo.pdf
BTW, my guess was wrong. Length is expressed in inches.
73, Russ WB8ZCC
On 8/13/2010 1:44 PM, Russ Hines wrote:
Hmm, the formula is a bit off, but... 30 x 32.785 =
Nate,
I have both the 12th and 14th edition of the ARRL Antenna books, the 12th I
acquired in 1974 and have read and re-read the section on transmission lines
and
impedance matching probabily more than anyone else has. I sometimes learn new
things with each re-reading, as there is much to be
Hmm, the formula is a bit off, but... 30 x 32.785 = 983.55. I'll also
bet length is expressed in feet.
Looks eerily like someone wants you to cut a one-wavelength piece of
coax cut at the mean repeater frequency.
Just a guess.
73, Russ WB8ZCC
On 8/13/2010 11:38 AM, Sid wrote:
I have a
@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of allan crites
Sent: Friday, August 13, 2010 12:56 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Coax length, etc.
Nate,
I have both the 12th and 14th edition of the ARRL Antenna books
to hear your explaination on how you would determine the length
of cable needed.
AC
From: Gary Schafer gascha...@comcast.net
To: Repeater-Builder@yahoogroups.com
Sent: Fri, August 13, 2010 2:36:23 PM
Subject: RE: [Repeater-Builder] Re: Coax length, etc.
Hi Allan
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Coax length, etc.
Gary,
Perhaps you can give us some examples to illustrate your thoughts.
Perhaps you can also explain why GE chose to include a pi
network on the output of the HB M-2 base xmtr to match the
xmtr
Allan,
Wow... sounds like a great article you guys are working on! Now that I see the
scope of what you're up to, it sounds like a great addition to the website.
(Well, it would have been a great addition anyway... but wow!)
You give me FAR too much credit, if you think I could add to it.
On Aug 13, 2010, at 7:22 PM, Jeff DePolo wrote:
d) To charge more. I'm half-joking on this; I can't say I've statistically
seen more or less failures on M2 PA's with or without the Z-matcher, so I'll
give this answer half a smiley: .-,
Lucky. I have. Learned that lesson... ;-)
Got a pile
: [Repeater-Builder] Re: Coax length, etc.
I'm going to take a stab at this, at the risk of possibly stepping on Gary's
toes.
1. RF amplifiers in general (not only solid state) don't *have* a 50 ohm
source impedance, they're (nominally) designed to work *into* a 50 ohm load.
The difference is subtle
motarolla_doctor wrote:
Kevin,
I am using your coaxial matching section on a couple of antennas with good
results. Great article on RB and not too hard to build
MD,
I wish I could take the credit, but the original concept was from a
friend W8ZD - I just improved upon his concept. For
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