Dual antenna issues

Should be 50.
Not going to happen without doing something to the feedpoint

 

Wow no one can figure out what the end result is with a phased feedline to dual antennas?

Should be? 50?

Do the math.

 

What should be and what are, don't always coincide with each other

 

Your original statement was " Since a 50 ohm mobile antenna doesn't exist, adjusting to 50 ohms means it is no longer resonant." You notice your statement " 50 ohm mobile antenna doesn't exist" which is wrong. That matching coil makes it resonant.

Secondly, I'm sure you have seen the trick of "tuning the coax" the match the 50 ohm impedance.

leon
kc0iv

 

X equals 0 and R equals 50 never occur simultaneously at the feed point to the best of my knowledge unless a hairpin matching device is used. Sure I can add an extra 90 degrees of cable to transform the impedance and present roughly 50 ohms to the transmitter but it would alter what I hear. I would prefer to go The Hairpin matching device route

 

I am shaking my head on that one, you need to get some thing else involved here.

 

At resonance, the input impedance of a decent-quality, correctly-mounted, HF mobile antenna will be about 25 ohms.
http://k0bg.com/match.html

Not sure why you're shaking your head. I thought you knew all this stuff.

 

An 8 foot whip, mounted to the average car/truck will show a feedpoint impedance of 30 - 45 ohms in the real world, and an acceptable SWR
http://www.qsl.net/g3pto/mobant.html
Same information in the handbook and anywhere else you look.
Not sure why you would be shaking your head.

 

Pretty much coincides with my real-world experience. All the guys that tune for resonance aren't 50 ohms at the feed point and all the guys that tune for 50 ohms are not resonant....
Kind of a conundrum for the CB guys that don't know anything about adding an inductor to the feedpoint to increase the feedpoint impedance.

 

Again shaking my head.

You missed a few things and I'm not going to point them out to you because of our discussion a while back about dipoles and the formula used to determine leg lengths. BUT it is obvious what the problem is if you understand phasing and how it is done.