Coil Question

[Anonymous]

I was wondering if Monte, or one of the other guys here on the forum could address the differences between the coils that will work on the uMax detectors and the LST/Tejon detectors. What is different about them to make them incompatible. Is it just because of the frequencies that they hunt at? Thanks for your help...thick skulled guys like me just dont get it sometimes <img src="/metal/html/grin.gif" border=0 width=15 height=15 alt=":grin">
J.

 

[Anonymous]

that is logically part of the equasion.
Early on Tesoro built their detectors to operate at 12.5 kHz. The same coils work on them as they do on most other Tesoro's. That includes the Shadow X2's at 9.6 kHz, up though the 10 kHz, 10.6 kHz, 12 kHz and even the 15 kHz Golden Sabre Plus.
Some search coils are manufacturerd without any tuning electronics inside the coil housing, but I think most coils are designed with it. What makes the difference between the 'standard' Tesoro models and the higher-frequency Tej

 

[Anonymous]

....prevents them from being interchanged between certain machines. The higher frequency coils of the LST / Diablo uMax / Tejon use 4-pin connectors, while the standard land coils use 5-pin connectors. The coils of the PI machines and water-based machines are also different in their connector configuration, and are not interchangable with the standard line of land machines.

 

[Anonymous]

...if Tesoros coils for its land/non gold machines are internally tuned or not. If you have a coil that will work on freqs from 10-16KHZ it would seem that there has to be tuning for the coil inside the machine. Since the windings of the coil remain constant but the frequency changes you would need to account for a change in inductance.
I wonder as we have been trying to see if an older tesoro coil could be made to work on a Treasure Baron w hich runs at 12.5KHZ...just like the older Tesoros's
Scott

 

[Anonymous]

My opinion only!!!
The coil is an antenna. It transmits and receives a signal. The farther away the coil in from the design frequency, the less efficient it becomes. This less efficient, the less depth.
HH
Vince S

 

[Anonymous]

One of the big dfference's in detector design over that of detectors of years ago is that most detector front ends are now broadand and not as frequency critical as they used to be. Years ago most detectors used crystal controlled oscillators and the coil frequency and tuning was a very critical part of the tranmitter tank circuit tuning. As with any transmitter antenna mistuning could cause feedback signal (SWR) which could if high enough overheat and possibly destroy the transmit transisitor. With amateur radio and CB radios we always tried to get a good a match between the antenna, transmission line and the transmitter as possible. As close to 1 to 1 as possible which meant that all of the power being sent to the antenna was being radiated and as little as possible was being refelected back. On a mistuned antenna with a SWR 3-1 would reflect 25% of the transmitted power back into the transmitter. This not only translated into less efficency and less transmit range it aslo caused a heat build up in the tranmitter which could eventually damage it. That is no longer the case with most of today's detectors. Still having a coil that is as close to the operating frequency of the transmitter is best and maybe the best way to determine that would be by measuring the inductance of one of the detector's original coils and comparing it against the coils that you want to try. Since some of the tuning will be done by capacitors with in the detector finding a coil with a similar inductance will allow it to be as close to the proper frequency as possible when connected to the rest of the circuitry. Still I would check with George Payne and see if the Treasure is Baron is of the older crystal control variety of detector.
HH
Beachcomber