I have the good ole sling shot wire antenna configuration. I picked up a
new SWR meter, hooked it up according to the directions, and the needle
didn't budge when checking SWR's.

The power indicator is fine, just not even a 'wiggle' on the needle for SWR
reading.
Bum meter?

"Macman" wrote in message
...
I have the good ole sling shot wire antenna configuration. I picked up a
new SWR meter, hooked it up according to the directions, and the needle
didn't budge when checking SWR's.

The power indicator is fine, just not even a 'wiggle' on the needle for
SWR
reading.
Bum meter?



probably... check on a different frequency or band to be sure... or just
disconnect the antenna and see what it does.

1:1 is possible, I've seen it, but reverse the connections to be sure.
H.
NQ5H

"Macman" wrote in message
...
I have the good ole sling shot wire antenna configuration. I picked up a
new SWR meter, hooked it up according to the directions, and the needle
didn't budge when checking SWR's.

The power indicator is fine, just not even a 'wiggle' on the needle for
SWR
reading.
Bum meter?

On Fri, 12 Dec 2003 17:30:13 -0500, "Macman"
wrote:

I have the good ole sling shot wire antenna configuration. I picked up a
new SWR meter, hooked it up according to the directions, and the needle
didn't budge when checking SWR's.

The power indicator is fine, just not even a 'wiggle' on the needle for SWR
reading.
Bum meter?

Every HF antenna here will go 1:1 "some where" although a couple of
them require a tuner to get there. OTOH, Yes, at least on my 75 and
40 meter half waves, the 20, 15, and 10 meter tribander as well as the
AV640 on the shop will hit 1:1 some where in the desired band without
a tuner.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair?)
www.rogerhalstead.com
Return address modified due to dumb virus checkers

On Sat, 13 Dec 2003 00:06:16 GMT, Roger Halstead
wrote:

|
|Every HF antenna here will go 1:1 "some where" ...

Not so.

"Wes Stewart" wrote in message
...
On Sat, 13 Dec 2003 00:06:16 GMT, Roger Halstead
wrote:
|
|Every HF antenna here will go 1:1 "some where" ...

Not so.

I have a dipole that is 1:1 at both it's main length design frequency and
the single fan dipole design frequency underneath it. Each began life 10%
longer than design (formulas), one actually had to have a few inches added -
and that was soldered when the line was still brand new. The other required
shortening in 2" increments. Over a period of two months, the antenna still
has "1:1" on those two design frequencies. Checked with reliable equipment
besides the MFJ 962D tuner, which now rests on "Bypass" except for higher
frequency diversions. This was designed and built for two frequencies only,
and performs flawlessly in that respect.

So yes, achieving 1:1 SWR is not only possible, but nothing less was
acceptable in the specific need I had for that antenna.

Jack
Virginia Beach

an antenna has an impedence at the frequency it is being used at, and an
impedence at its resonant frequency. If either of these impedences happen to be
50 ohms and the coax being used is 50 ohms, and the transciever is working at
50 ohms, then the swr is 1:1, and the swr is on the transmission line, not on
the antenna.

The antenna does not have to have an impedence of 50 ohms at either the
frequency being used at or at its resonant frequency, and these two freqeuncies
could be the same, and the transmission line does not have to be at 50 ohms,
and for that matter neither does the transciever. If any one of these is
mismatched, then the swr is not 1:1.
An impedence transformer at the antenna-transmission line junction will
transform a mismatch so there is no reflection on the transmission line, amd if
this impedence is the same as that of the transmitter, then the swr is 1:1, if
the impedence is not the same, then the swr is not 1:1 unless it is also
transformed at the transmitter, and again the swr would be 1:1 on the
transmission line, which is where the swr is, it is not on the antenna.

William F. Hagen wrote:
an antenna has an impedence at the frequency it is being used at, and an
impedence at its resonant frequency. If either of these impedences happen to be
50 ohms and the coax being used is 50 ohms, and the transciever is working at
50 ohms, then the swr is 1:1, and the swr is on the transmission line, not on
the antenna.

One source of confusion is, on systems with both coax and ladder-line,
the SWR on the coax Vs the SWR on the ladder-line. A 12:1 SWR on 600
ohm ladder-line can result in a 50 ohm SWR of 1:1 without a tuner.
The ladder-line can be used as an impedance transformer.
--
73, Cecil http://www.qsl.net/w5dxp



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On Thu, 18 Dec 2003 07:29:39 +0000, William F. Hagen wrote:

an antenna has an impedence at the frequency it is being used at, and an
impedence at its resonant frequency. If either of these impedences
happen to be 50 ohms and the coax being used is 50 ohms, and the
transciever is working at 50 ohms, then the swr is 1:1, and the swr is
on the transmission line, not on the antenna.

The antenna does not have to have an impedence of 50 ohms at either the
frequency being used at or at its resonant frequency, and these two
freqeuncies could be the same, and the transmission line does not have
to be at 50 ohms, and for that matter neither does the transciever. If
any one of these is mismatched, then the swr is not 1:1.
An impedence transformer at the antenna-transmission line junction will
transform a mismatch so there is no reflection on the transmission line,
amd if this impedence is the same as that of the transmitter, then the
swr is 1:1, if the impedence is not the same, then the swr is not 1:1
unless it is also transformed at the transmitter, and again the swr
would be 1:1 on the transmission line, which is where the swr is, it
is not on the antenna.


I was going to say something similar. a 1:1 SWR means that the Load
matches the Transmission line. It says nothing about the condition of the
antenna. Most antennas have a matching system or "Tunner" built into
them, like a Gama Match for example, to transform their Impedance back to
the standard 50ohm coaxial transmission line.

Ron

On Fri, 12 Dec 2003 22:32:07 -0700, Wes Stewart
wrote:

On Sat, 13 Dec 2003 00:06:16 GMT, Roger Halstead
wrote:

|
|Every HF antenna here will go 1:1 "some where" ...

Not so.

I'd like to know how you can say that?

Have you measured all my antennas? You are welcome to come over and
check them out. Every one "according to my meter which is a Bird"
reaches 1:1 some where in the desired band. It may not be exactly the
frequency the formula predicted, but it'll be relatively close.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair?)
www.rogerhalstead.com
Return address modified due to dumb virus checkers