SWR Too low

[sp5it]

!!##@ ??? Very sorry Mike that just blew over my head.. However you told me my GM reads dead short across center to shield.........Cool.....M

That is OK. It is DC shorted antenna. No matter for RF.
Mike

 

[w9cll]

Just for info only, using 130' run of 8x is costing you 2db of loss.

 

[Shadetree Mechanic]

View attachment 34120
View attachment 34121
Just for info only, using 130' run of 8x is costing you 2db of loss.

Just wondering, what would be the loss on the receive for the cable?

 

[Mark Malcomb]

Am curious. Is your low SWR reading the same on channels 1, 20 and 40?

Yes it doesn't move when I run the channels....Weird

 

[Riverman]

Yes it doesn't move when I run the channels....Weird

I know that antenna is very broad-banded and reportedly produces low SWR’s over a wide range of frequencies, but it seems there should be some variance across the CB band even if it’s not much.

 

[Mark Malcomb]

when i get home from work I'm gona throw the old coax back on and double check this
more, Its got me confused. I like better SWR however barley moving the needle makes me feel a problem..........TY

 

[HomerBB]

Personally, I wouldn't worry about a low SWR all across the band.

 

[Riverman]

Personally, I wouldn't worry about a low SWR all across the band. View attachment 34122

I wouldn’t either, Homer. But Mark says his needle doesn’t move at all. And the antenna is only 4’ above the ground during testing. Just seems a little odd to me, that’s all.

 

[OldTech03]

Well, it should most likely be tested at the antenna if at all possible with a 6-inch jumper and an analyzer or portable radio or even a walkie talkie "just trying to cover the bases" that way you could see if there is first a different reading at the antenna and second a conflict with the coax length. Remember the loss of power being delivered to the antenna through 130 feet of coax could be significant and should be measured by inserting a meter at the antenna and comparing it to a measurement of power at the radio the reason being if there is significant loss it would also result in a lower reading on the SWR meter as the loss would be experienced both in the forward and reflected directions. You could also through a 50ohm load at the end of the coax and see what happens. W9cii covered some of this in his charts just thought I would try putting in words.

 

[Mudfoot]

My GM is Flat Flat Flat across the CB band. Flatter than a pancake.

 

[Riverman]

My GM is Flat Flat Flat across the CB band. Flatter than a pancake.

Cool! End of story!

 

[Handy Andy]

Whew!


​