From: w...@w8ji.com
The worse case SWR of a 50 ohm system with 75 ohm cable isn't 1.5:1 when
normalized to 50 ohms. It is 2.25:1. 1.5*1.5 = 2.25
A 50 ohm load with 1/4 wave of 75 ohm is 112.5 ohms, and that is 2.25:1.
This is why the cable needs to be 1/2 wave long, so impedance is back
From: n...@cox.net
Please explain virtual SWR. I never heard that in any college classroom I
have been in.
Hardy N7RT
That's a phrase I coined in response to the situation Tom described; maybe
another term would be used in the textbooks. A quarter wavelength 75 ohm coax
working into
A quarter wavelength 75 ohm coax working into a 50 ohm load, transforms
the 50 ohm load to 112.5 ohms, non-reactive, as it appears at the end of
the coax next to the transmitter, as previously discussed.
Good so far.
If we place a 50-ohm SWR meter at the near end of the coax, between it
and
One of the reasons I belong to this group is the experience and expertise
of the operators on here. I have a question about my next step, in terms
of radios. This is not necessarily a 160m question, but it does affect
Topband.
I currently have FT-950 Yaesu. Upgraded through some horse trading
Trent,
I have a TS-2000 here which is used almost exclusively for Remote rig
contest operation of NP2P. I would never use it for a main station
radio because of the difficulty of the man menus and sub menus that one
must navigate through. I would highly recommend the Icom IC-7410 (a
step
Don,
Tnx for your reply. I see exactly whar's happening. In fact I do the same
thing with my Delta Loop on 160. It's about 110 to 120 ohms at the
feedpoint, so I use a ¼ wavelength of 75 ohm Belden down to a ½ wavelength
of RG213. And that's it. The confusing point is there are two impedance
