Old coils vs new ones

[magic]

Its raining here today so I got my V3 out to play with some setting and do a little testing.
I have noticed that with the new v rated coils, you can use three frequency and still get good rx gain #s as you should be able to.
With the old non V rated coils...not so good.
But...I have noticed than when using single 2.5 frequency on the new V rated coils...the suggested rx gain is not so much.
On the other hand, The non-V rated coils..in single 2.5 frequency gives you much better suggested rx gain and air test about 2 to 3 inches farther than the new V rated coils in single frequency.
Is it possible that we may need to keep our old coils as well for the single frequency mode?
I am no expert on this and thats why I am wondering about why this is and why you cant get the better #s in single 2.5 frequency with the new V rated coils?

 

[The Beep Goes On]

If you make these assumptions...

- Old coils fail using three frequency or 22.5 since they are not tuned for this high freq
- V-rated coils are tuned for all three freqs, singly or together
- Old coils are more specifically tuned for the lower freqs

Together, these statements might answer the "why".

If an old coil gets better depth (and/or allows higher sensitivity settings) than a V-rated coil at a single freq you like to use, and it has the same TID and pinpointing characteristics (reliability/accuracy/sensitivity) then, yes, I would hold on to it.

Beep

 

[Butch in Colorado]

The older eclipse coils were not designed for this higher voltage as that was not an issue with the MXT and DFX machines. The eclipse coils are not as frequency focused as you may think. How do I know this? I had the same questions regarding the older Eclipse coils verses the newer v-rated coils and I asked my local White's dealer. That was the information that was provided to him and then on to me when I had asked.

Regarding the following comment:
- V-rated coils are tuned for all three freqs, singly or together

I would disagree slightly with it because no single wire coil can be tuned to all three frequencies. If you refer to antenna characteristics, you would have to actually have three different coils tuned to each different frequency.

A single wire will be tuned to a fundamental frequency and will work well on the harmonic of that fundamental frequency but never as good as the fundamental frequency would be.

2.5 7.5 and 22.5 Khz are all multiples of each other. So there is no way that a single transmit wire that is in the Eclipse coil can be individually tuned for all three frequencies. It can only be tuned for one frequency and will work but be less effective on the other harmonics of that fundmental frequency.

The eclipse coils and the associated resistive / capacitive / inductive circuitry are designed to work over a broadbanded range (2.5 to 22.5 Khz) and not be tuned to any specific frequency.

They may be optomized to work in the center of this frequency range but not all three. Think of a CB antenna. It works over a range of 26.965 - 27.405 Mhz. No antenna that you buy is tuned to any one of the channels of a CB. The antenna is tuned to work well over the range of this band. The same holds true to the newer Eclipse coils.

If you were to open up one of the Eclipse coils you would more than likely find some additional resistors, capacitors or inductors that form the tuning mechnisim that provides the Eclipse coils the ability to work over this range of frequencies. The X-nulling that has been talked about is inductive tuning, at least that is my assumption without destroying a coil to satisfy my curiosity. I may do that one day but not until I have a coil go bad that is way out of warranty.

 

[The Beep Goes On]

Cool...thanks for the clarification.

 

[magic]

Thanks for the responces. I understand alot better now. So I am thinking that if the older coils are more (in tune) with the 2.5 frequency..then hunting for deep silver would be best with an older coil. The deep silver mode operates on 2.5 only and from what I can gather so far with my air testing, the older coils flat out beat the new v nulled coils in 2.5 frequency only. Gotta do some more testing on this....