Frequency select

[dan93]

Can the V3 be set to use only 2 frequencys for example 2.5 and 22.5 and not use 7.5?

 

[Rob (IL)]

No it can't. It runs 3 frequencies, the best of two frequencies (correlate), or an optimized single frequency.

In the correlate mode the detector chooses the best two frequencies, you don't have the choice of which two frequencies.

 

[dan93]

Is there a technical reason why 2 frequencies can't be selected. I am curious since the V3 has almost every option available.

 

[GroundScanner]

In correlate mode , what does span and wrap do and why would they be adjusted ? Also has a offset , why would it be adjusted? TY HH GS

 

[Rob (IL)]

Yes, I'm sure there is a technical reason for not being able to select just two frequencies, but one of the designers would have to answer why. I can only tell you that is the way it is.

 

[Rob (IL)]

Span and wrap is explained starting on page 37 of the V3 manual.

Span Limit

 

[GroundScanner]

Rob thanks for explaining the wrap and span. The more i know the more i can master and get the best out of the v3i.

 

[Larry (IL)]

The VX3 operates in correlate or single frequency, it has no 3 frequency best data.


I might be wrong but I think the VX3 operates in Best data (default) or single frequency. I don't think the VX3 has Correlate mode.

 

[dan93]

I looked on other sites and still can't find why only 2 frequencies can't be selected?

 

[Larry (IL)]

Are you talking Best Data two frequency or Correlate? If you are talking Best Data, just ignore the 7.5 data, there you go, 2.5 and 22.5, but why do that, you are losing 33% of your target info?

If you are talking Correlate 2.5 and 22.5..... what would be the benefit? The V3i automatically picks the the two best frequencies to correlate and you would be eliminating one of them.

 

[Rob (IL)]

dan93 the reason you can't get select 2 frequencies is because that is how the detector is made. There is no explanation of how to do it. There is no need to keep looking.

 

[Rob (IL)]

The VX3 operates in correlate or single frequency, it has no 3 frequency best data.


I might be wrong but I think the VX3 operates in Best data (default) or single frequency. I don't think the VX3 has Correlate mode.

On page 4-2 of the VX3 manual
The default frequency mode for most programs is standard
Three Frequency. In this mode, VX3 simultaneously transmits at
2.5kHz, 7.5kHz, and 22.5kHz. 3-frequency mode gives the best
overall response to the broadest range of target conductivities.
In any frequency mode VX3 will plot the VDI responses in
the SpectraGraph screen and also calculate an overall VDI
number for the target.In 3-frequency mode the results from at
least two responding frequencies must agree in order to display
the VDI number and generate a tone response. This helps minimize
false positives.

 

[Larry (IL)]

My bad........I just read that paragraph and blew right by the "at least two".

 

[dan93]

I was thinking of getting a V3 I was just wondering about the transmit frequencies, if you could select 2 transmit frequencies say 2.5 and 7.5 only, or 2.5 and 22.5.

 

[Rob (IL)]

I understand, but you can't. In correlate it will be 2.5 and 7.5 on a target or 7.5 and 22.5 on another target. You don't get to select.

What reason would you have for selecting 2 instead of 3 as Larry asked?

 

[dan93]

Why I asked is if a detector is transmitting more than one frequency isn't the transmit energy divided among the frequencies? Would being able to select only 2 frequencies out of the 3 for example 2 higher or 2 lower frequencies be an advantage depending on your intended targets? Would the performance be better than trasmitting all three together?

 

[Rob (IL)]

Why I asked is if a detector is transmitting more than one frequency isn't the transmit energy divided among the frequencies? It is still hotter than the 2 frequency DFX. Transmit power is not a problem. The V3i will pick up a barrel at 3 ft, so the field is going farther than you would ever need. Would being able to select only 2 frequencies out of the 3 for example 2 higher or 2 lower frequencies be an advantage depending on your intended targets? NO If it were we would be using the DFX. Would the performance be better than trasmitting all three together? NO

You can select optimized one frequency mode.

 

[gldfver]

The wheels on the bus go round and round...

 

[Rob (IL)]

I don't understand the last post.