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
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 in a different form.
We can have 10:1 SWR, which would be a 1.743 dB return or mismatch loss
or 67% reflected power,
Our plans for a 160m operation and CQWWCW entry were delayed due to supply
issues and construction woes. THINGS ARE NOT EASY IN HAITI !!! We are very
fortunate that we had any place to operate. We had only very low dipoles on
the higher bands at the hotel/guesthouse.
Thanks to the great
Hi, Chuck
Well return loss is a transmission line term that is a measure of the
reflection on the line. So a transmission line that is terminated in its
characteristic impedance would have 0 reflection, or infinite return loss or
1.0:1 VSWR. Conversely if the line was lossless and terminated in
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
Well, I would respectfully disagree with Tom, that Return Loss is
confusing or ,misleading. It's just another way of looking at reflections
that often makes more sense of is more useful. For example, many filters
etc. are specified in terms of their input return loss, usually in a 50 ohm
Rich,
It's an issue that's not usually seen in the broadcast engineering world
where one frequency is transmitted for broadcast. 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
The bad thing about high SWR in a high powered system are the resulting high
voltage points and high current points generated by the forward and
reflected waves. Those high voltages and current points can do a lot of
damage to your equipment.
73
Lloyd - N9LB
-Original Message-
From:
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
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.
Of course the typical inverted L is just a monopole that is bent over at the
top to reduce the required
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