I put a shorted 1/4 wave stub — about a foot long on 144 MHz — on the coax to
my 2m beam. The beam is right under my HF antenna, and thanks to the stub I can
run 1.3 kW on 40-10m with absolutely no interference to the 2m rig, and no
effect on 2m SWR. Before I had the stub, hitting the key on
Hi Mark,
Whoever you talked to needs to go back to school and study Maxwell's
equations. He is WRONG!
http://k9yc.com/TransLines-LowFreq.pdf
http://k9yc.com/Coax-Stubs.pdf
73, Jim K9YC
On 4/1/2020 2:45 PM, Mpridesti wrote:
Requested technical comment from a long established coaxial cable
I would not be buying any cable from them.
Wes N7WS
On 4/1/2020 2:45 PM, Mpridesti via Elecraft wrote:
Requested technical comment from a long established coaxial cable manufacturer
on this topic.
This was the response:
The Vp is not measured at any frequency and is independent of
H I'm seeing great variability in the Vf does/does not vary with F.
This link says yes:
https://owenduffy.net/transmissionline/concept/mvf/index.htm
Other's say no...
My "gut" says yes.
Yea! Now I have something to research in order to figure out how/why!
My favorite kind of
A typical, Type RG-58A Vf measurement, as a function of frequency, is
shown in second plot: https://www.kn5l.net/transMeasure/
Vf is frequency dependent.
John KN5L
On 4/1/20 4:45 PM, Mpridesti via Elecraft wrote:
> Requested technical comment from a long established coaxial cable
>
Requested technical comment from a long established coaxial cable manufacturer
on this topic.
This was the response:
The Vp is not measured at any frequency and is independent of frequency. The
only variable in play is the dielectric constant. The Vp represents the speed
at which a signal
On 4/1/2020 7:58 AM, Don Wilhelm wrote:
When dealing with a length of transmission line, the use of the '468'
factor should not be used - compute the actual wavelength and then apply
the velocity factor.
There is yet another variable -- VF varies with frequency. At low
frequencies, it is
7 matches
Mail list logo
