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Hi i have a redheat mk IIII it is four pin like my tesoro DD coil, plugs are very similar and the cable looks identical,both machines run on the same voltage(battery wise anyway)and i know the tesoro coil will cater for 14khz to 18khz,i dont know what freq the red heat runs at,ive changed plugs on tesoro 4 pins before so i know theres two wires inside with inner and outer cores and i know what numbers they go to on the plug,what are the chances of me taking plug off redheat coil and finding same color wires to connect up like on tesoro 4 pins,and trying it,or if diff wire colors keep swapping around untill i get it right,could i damage detector doing this or maybe coil as i have a spare coil for redheat and i also have an old tesoro polo coil with no plug on i was thinking about using the polo as a test piece untill i work configeration out,any help on this would be greatly appreciated,cheers wayne.
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Use an inductance meter to figure out how the Red Heat coil is pinned out, and also the Tesoro. Also see how close the inductances are. Tesoro coils tend to be untuned so they may work on the Red Heat. -
inductance meter
Sorry dont have inductance meter,cant i just try switching wires around untill it works or will i damage detector or coil,i have a freind whos a tv repairman would he have one of these meters and what would i be looking for,cheersOriginally posted by Carl-NC View PostComment
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There was a Red Heat detector on eBay recently without a coil, and the seller stated that no other commercial coils would fit. Although I have heard the Red Heat is similar to the Tesoro designs, so he may have only been referring to the plug arrangement. It's possible that a Tesoro coil might be re-wired to work, but you would need an inductance meter to do this successfully. There are so many permutations when it comes to search coils that you are unlikely to succeed by randomly swapping connections.Originally posted by dejavuband View Post
Where do you live? Maybe another Geotech member could help you.Comment
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RE METER
Hi lads my mates got an inductance meter he repairs tvs so what will we be looking for in laymen terms please when using meter,cheersComment
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Record the inductance reading that you get between the various pins of the Red Heat coil and post the results here.Originally posted by dejavuband View PostComment
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do i need to get readings from tesoro DD coil aswell,and will i have to take note which pin produces what reading ie like no4 red wire etcOriginally posted by Qiaozhi View PostComment
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It might be a good idea to check the Tesoro coil inductances as well, for two reasons.Originally posted by dejavuband View Post
- You have a 4-pin Tesoro coil, which I think has approximately 1mH for the TX, and 6.5mH or even higher for the RX. Would be good to check this.
- Checking both coils with the same meter will average out any measurement errors.
Of course, we will also need the pin numbers and wire colors.Comment
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what would be except-able numbers from redheat coil if DD is 1mh for tx and 6.5mh for rx,would the numbers need to be same or have i got a little bit of lewayOriginally posted by Qiaozhi View PostComment
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You will have some leeway, but we need to see the numbers first.Originally posted by dejavuband View PostComment
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i have just one more question before having coil tested? on my tesoro DD coil its only got two wires inside so the inner and outer core of each wire make into the four pin that it is but inside the redheat coil cable there are four single inners that go to the four pin plug and theres also an outer strand with the black wire that goes to the same pin as the black(maybe earth)so theres five wires in the redheat coil going to four pins, will this make a diff?and would it make a diff if the redheat is an analogue machine because the DD coil is one of the latest HOT coils from tesoro,any of these factors make a diff or am i looking into it to much,does it just boil down to the test numbers from each coil,cheers wayne.Originally posted by Qiaozhi View PostComment
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In the Tesoro configuration the two outer cores are joined together in the search head, and connected to 0V in the control box. From your description of the RedHeat coil, it sounds like the black/screen is connected to 0V, and presumably (with one of the other wires) forms a connection to the TX. The other two would then go to the RX coil. A simple continuity test would determine if the RC coil is isolated from the TX.Originally posted by dejavuband View Post
Could you open the RedHeat control box and find out which wires got to the TX and RX circuits? Or maybe post a photo?Comment
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As the redheat detectors were only made by the bloke that built them he was very strict about privacy and every detector he made was sealed you can not get into them without damaging them he sealed every unit he said it was for water proofing purposes but i think he didnt want any one looking inside them,im having coils checked at 3pm today so ill post results as soon as i get themOriginally posted by Qiaozhi View PostComment
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coil readings
can you work out which is RX or TX from the values as the person who done the test on coils
hasnt mentioned nothing about them(he may not know as he repairs tvs)anyway this is what hes give me
TESORO DD COIL
GREEN WIRE INNER AND OUTER, PIN NUMBERS 4,2 /1.5mh
RED WIRE INNER AND OUTER,PIN NUMBERS 3,1 /1mh
REDHEAT COIL
RED AND BLACK WIRE,PIN NUMBERS 1,2 /5.6mh
WHITE AND GREEN WIRE,PIN NUMBERS 3,4/5.4mhComment
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It is difficult to know from these values which is the TX and which is the RX. However, it is clear that the Tesoro coil is not compatible with the RedHeat. The inductance values are actually closer to the 5-pin Tesoro coils, but I suspect that these would not work successfully either. Troy detectors use a 1mH TX coil, but the RX inductance is considerably higher. Without seeing a circuit diagram for the RedHeat, we would only be guessing.Originally posted by dejavuband View PostComment
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