I know this is crazy but they are located at different points along the feed
line from radio to antenna.  I wonder if this could cause what you are
seeing?

Take care and very 73. 


 
Kevin :)
Amateur Radio:  K7RX
 

-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Tom Behler
Sent: Tuesday, November 15, 2011 15:32
To: [log in to unmask]
Subject: TS590 internal watt and SWR meter VS LDG TW1

Hi, all.

As I have been working on tuning my newly-installed 160 meter half sloper 
antenna, I have noticed something interesting, when comparing the SWR's on 
160 meters that are given to me by the TS590 internal meter, and the LDG TW1

talking watt meter.

What I have noticed is that the TS590's meter gives me a 5 to 1 SWR at the 
top and bottom of the band, with the lowest SWR at about 2.0 to 1 around 
18.300 or 18.400 MHZ.  Also, the TS590's internal auto-tuner seems to tune 
the antenna from the top to the bottom of the band with no problem.

Interestingly, though, my TW1 starts out ok with farily similar readings to 
those given by the TS590's internal meter, but as I get to the top of the 
band, its SWR readings shoot up to about 12 or 13 to 1, in comparison to the

5 to 1 given by the TS590's internal meter.  All readings are taken with the

TS590 auto-tuner in the off position, and with an output power of 
approximately 30 watts.

Would anyone have an explanation for these variations I am seeing?

I do not seem to notice this much of a variation on other bands.

As a side note, due to the fact that the MFJ 259B analyzer I am borrowing 
gets confused because of the A M broadcast station in my area, I honestly 
don't know what the resonant frequency of the antenna is, but I think I am 
reasonable in saying that it's probably not too far from 18.300 or 18.400 
MHZ.

73 from Tom Behler:  KB8TYJ