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FA-VA5

 

Under SWR Single sweep, based on this practically useless manual, how do you tell which side is plus (+) and which is minus (-)???
Thanks.....Ken
 

Ken's question was answered by direct e-mails.
Otherwise, pages 15-17 of the FA-VA5 manual are relevant.
regards
Dieter, VK3FFB
 

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Sorry but just gotta ask - what is + or - when related to Single sweep SWR ?? Never heard of a negative SWR.

Mike / W8DN

On 10/11/2021 10:20 AM, Ken W2GIW wrote:

Under SWR Single sweep, based on this practically useless manual, how do you tell which side is plus (+) and which is minus (-)???
Thanks.....Ken

 

Hello Mike
The question was related to the frequency axis of a VSWR graph on the FA-VA5. If we have a "delta-f axis" with the sweep defined as fc +/- delta-f then the axis shows negative delta-f values to the left of fc.

VSWR is always positive and greater or equal to 1.0.

73
Dieter, VK3FFB
 

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Ok, now I understand and would automatically assume + to the right. However, that brings another question - why or when would such a scale be appropriate or useful. I would think a linear frequency scale would always be more easily interpreted but, I am thinking in terms of an antenna. Maybe for circuit analysis?

Thanks,
Mike / W8DN

On 10/12/2021 6:56 PM, Dieter VK3FFB (group owner) wrote:

Hello Mike
The question was related to the frequency axis of a VSWR graph on the FA-VA5. If we have a "delta-f axis" with the sweep defined as fc +/- delta-f then the axis shows negative delta-f values to the left of fc.

VSWR is always positive and greater or equal to 1.0.

73
Dieter, VK3FFB

 

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Just dawned on me that this may be related to the actual device display rather than the software display. Right ?? Have to admit that I have never used the device display. Need to expand my horizons !!

Mike

On 10/12/2021 7:30 PM, Mike W8DN via groups.io wrote:

Ok, now I understand and would automatically assume + to the right. However, that brings another question - why or when would such a scale be appropriate or useful. I would think a linear frequency scale would always be more easily interpreted but, I am thinking in terms of an antenna. Maybe for circuit analysis?

Thanks,
Mike / W8DN

On 10/12/2021 6:56 PM, Dieter VK3FFB (group owner) wrote:
Hello Mike
The question was related to the frequency axis of a VSWR graph on the FA-VA5. If we have a "delta-f axis" with the sweep defined as fc +/- delta-f then the axis shows negative delta-f values to the left of fc.

VSWR is always positive and greater or equal to 1.0.

73
Dieter, VK3FFB


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