Good question Don. You have to keep in mind that the 100 ohm load will make
for a 1.333 swr in the 75 ohm coax. At a length of one quarter wavelength
the 100 ohm load impedance is transformed to 56 ohms, which is pretty close
to 50 ohms and looks like a low swr to the radio.
But, the swr inside the 75 ohm coax is still 1.333 at all points along the
cable.
73,
Gerald K5GW
In a message dated 1/14/2015 12:13:49 P.M. Pacific Standard Time,
donroden@hiwaay.net writes:
Explain the case where a 100 ohm load ( 2:1 ) can be a 1:1 swr at the
transmitter with a length of 75 ohm cable. I've changed the cable
length and improved the SWR.
Don W4DNR
Quoting Gary Schafer <garyschafer@largeriver.net>:
It means that-- if you are looking at the SWR at your radio and there is
a
tuner after the SWR bridge, any changes in cable length after the tuner
will
show a change in SWR at the radio if you do not touch the tuners tuning.
This assumes that the load on the end of the cable is not 1:1.
2nd, the SWR will always remain the same at the radio no matter what
length
of cable is used (except or cable loss) or what the load impedance is as
long as that load impedance remains the same.
73
Gary K4FMX
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of
donroden@hiwaay.net
Sent: Tuesday, January 13, 2015 2:01 PM
To: amps@contesting.com
Subject: Re: [Amps] Input SWR revisited
Clear as Mud .........
What does it all mean ???
Don W4DNR
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