On Fri,12/5/2014 12:29 PM, Charles Yahrling wrote:
Just getting started modelling and looking for answers to questions not
found in manual so far. For example, what exactly is included in the
Return Loss figure shown in the SWR window? Just ground reflection loss,
total system loss, something
Thanks for your explanations Charlie es Tom. I guess return loss is the
opposite of what it sounded like to me. At any rate, you've explained why
it varies inversely with SWR.
Next question: in the manual the ALT IMPEDANCE explantion uses a 4:1
transformer example, which I get. I've been
We can have 67% reflected power and still have nearly 100% of transmitter
power getting into the antenna and being radiated.
Then could someone please explain why the manufacturers of ham, broadcast
AM/FM/TV, and other transmitters specify the maximum SWR (e.g., minimum
return loss) for
Chuck,
Next question: in the manual the ALT IMPEDANCE explantion uses a 4:1
transformer example, which I get. I've been toggling between RG213 50 ohm
and rg6/u 75 ohm to observe differences, reasoning that if I use a 75 ohm
feeder and get 2:0:1 or lower SWR values, the 50 ohm system would
Not sure that I can picture just what you are describing, Paul. Even
though, I wasn't born until 1944, I've explored just about every type of
antenna and I've modeled an awful lot of them.
See the image in the link below:
After rotating the image in your browser, note that the feed to the
Thanks, Carl
I suppose all those wires helped to increase bandwidth.
Charlie
K4OTV
-Original Message-
From: Carl [mailto:k...@jeremy.qozzy.com]
Sent: Saturday, December 06, 2014 10:20 AM
To: Charlie Cunningham; 'Paul Christensen'; 'topband'
Subject: Re: Topband: EZNEC 5.0 +
Charlie
-Original Message-
From: Charlie Cunningham
Sent: Saturday, December 06, 2014 9:49 PM
To: 'Paul Christensen' ; topband@contesting.com
Subject: Re: Topband: EZNEC 5.0 +
Thanks for all the info and the memories, Paul!!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun
Just getting started modelling and looking for answers to questions not
found in manual so far. For example, what exactly is included in the
Return Loss figure shown in the SWR window? Just ground reflection loss,
total system loss, something else? Trying to understand why Return Loss is
Chuck,
SWR and return loss are related. Check these out:
http://en.wikipedia.org/wiki/Return_loss
http://www.minicircuits.com/app/DG03-111.pdf
What are you modeling?
73, Mike
www.w0btu.com
On Fri, Dec 5, 2014 at 2:29 PM, Charles Yahrling cfytech2...@gmail.com
wrote:
Just getting started
...@gmail.com
To: topband@contesting.com
Sent: Friday, December 05, 2014 3:29 PM
Subject: Topband: EZNEC 5.0 +
Just getting started modelling and looking for answers to questions not
found in manual so far. For example, what exactly is included in the
Return Loss figure shown in the SWR window? Just
] On Behalf Of Charles
Yahrling
Sent: Friday, December 05, 2014 3:29 PM
To: topband@contesting.com
Subject: Topband: EZNEC 5.0 +
Just getting started modelling and looking for answers to questions not
found in manual so far. For example, what exactly is included in the Return
Loss figure shown
We can have 67% reflected power and still have nearly 100% of transmitter
power getting into the antenna and being radiated.
Then could someone please explain why the manufacturers of ham, broadcast
AM/FM/TV, and other transmitters specify the maximum SWR (e.g., minimum
return loss) for the
W8JI
Sent: Friday, December 05, 2014 4:40 PM
To: Charles Yahrling; topband@contesting.com
Subject: Re: Topband: EZNEC 5.0 +
Return loss is just another misleading confusing way to express SWR.
Return loss, like percentage reflected power, does not indicate any type of
loss. It just expresses SWR
@contesting.com
Subject: Re: Topband: EZNEC 5.0 +
We can have 67% reflected power and still have nearly 100% of transmitter
power getting into the antenna and being radiated.
Then could someone please explain why the manufacturers of ham, broadcast
AM/FM/TV, and other transmitters specify the maximum
: Topband [mailto:topband-boun...@contesting.com]On Behalf Of
Charlie Cunningham
Sent: Friday, December 05, 2014 6:30 PM
To: 'Tom W8JI'; 'Charles Yahrling'; topband@contesting.com
Subject: Re: Topband: EZNEC 5.0 +
Well, I would respectfully disagree with Tom, that Return Loss is
confusing
Hello Paul,
RE:
Typically a transmitter will fold-back delivered power when its output Z
is fixed (e.g., 50 or 70-ohm) and SWR exceeds some predetermined amount
set by the manufacturer. This is typical of broadbanded solid-state
amplifiers with a fixed output Z that use no output matching
What did they call the teens to 20's antenna that had multiple feeds
coming
down from one end of the flatop to the other?
Both the T and the fanned inverted L were popular on 200m in 1910-1920
just as the single-wire Inverted L is today on 160m. Back then, ops were
obsessed with maximum
that you are describing, because I can't quite picture it.
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Paul
Christensen
Sent: Friday, December 05, 2014 11:23 PM
To: topband
Subject: Re: Topband: EZNEC 5.0 +
What did they call
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