Ever wanted to fine tune the sensitivity on a 1236?

[Keith Southern]

Ive had a few 1236 detectors since there release.But I always come back to them after trying other detectors. Any how ive noticed some differences in the the what fisher calls threshold at maximum setting.Ive had some that would have the static or threshold sound break in at 8 on the sensitivity and would actually overload the detector by the time it was wide open then ive had some that never had a static thresh sound at wide open sensitivity they all worked but the ones were the thresh started coming in around 9 on the dial or little over and was just barely audible seemed to give the best depth to me plus run smoother in bad ground. to get any of them to behave like this all you have to do is open the control box and look at the potentiometer on the back portion of the board next to where the coil connects its called r-57 this is the threshold pot its very touchy a little wiggle will do wonders. Just get a non metallic flat screwdriver and set your sensitivity to about 9 or a little above and move it counter clockwise to raise the threshold and move it clockwise to lower it . Just dial it in to you get a nice raspy sound and you'll know your getting maximum performance from you're machine. I.E. getting more sensitivity it will increase you're depth at this setting and stability if your is to erratic from the factory.

Also if you would like to fine tune you're iron preset its in the front of the board right behind the discriminator it can run the full disc range if some of you wanted to set it any were and have it locked.

Just some info maybe someone can use.


Keith Southern

 

[Jackpine Savage]

Thanks Keith! The first 1236 I had was as you described, just right with a low "threshold" coming in around 9 on the dial. Set there those whisper signals on deep targets are clearly heard. I don't recall ever using the volume in the boost area, always kept it around 4 1/2 for the modulatied audio. Where do you generally run yours?

Thanks again.

Tom

 

[Dan-Pa.]

Oh those little tricks..Most units have adjustable pots but be careful and mark the starting point if you goof up so you can reset...Most manufactures don't want untrained individuals experimenting, but many do and increase the potential of their unit..Always remember years ago many 1235 X users on planted hunts tuned it to get less depth but more coil coverage and surely the 1235X was one of the best competition units ever made as targets are usually shallow and more coverage with each sweep certainly was an advantage...

 

[Keith Southern]

Thanks Tom. I usually run the volume on the 1236 around 5-6 or so I use low ohm headphones also. The fisher 40.00 kind I think there around 8 ohm or so. for some reason the 1200 series detectors have always seemed to perform better for me with the lower ohms makes bigger iron more discernible to me over say the higher ohm killer Bs..Killer Bs and gray ghost seem to make some of the rejected iron loose that crackle and sort of give a dig it up sound I belive its the digital speakers with the clipping effect they offer faster shut down.the old school speakers or should I say the paper style speakers of low ohms are analog type and seem to give you the true sound to hear all the nuances of the target since the 1236 audio is also analog I believe .

It could just be me but I like the effect they have for my hearing at least.

But back to the original question the half volume does allow you tell the deeper targets from the shallow targets by modulating the audio for depth perception.

Gotta love the 1236 one heck of a detector.

Keith Southern

 

[Keith Southern]

You're right Dan always mark a pot before turning!!.You mention the 1235 being a great competition hunter yes they were.They 1236 retained the ability to be hot off the sides of the coil like the 1235.You can get in the general area and the detector will start letting you know a targets near by.I'm afraid this technology we know is slowly coming to an end from Fisher as the newer models are slowly introduced. Maybe not but you sort of get that feeling. I hope they do retain one model in there line up with the 1200 series build quality and depth. no meters just great discrimination and fisher audio which to me is the best sounding of all the offerings we've ever had from any manufacturer.

Keith Southern

 

[Jackpine Savage]

Back when the 1236 was my main machine I was using a pair of Koss stereo phones rated 99 Ohms if I remember right. I did try some others later but just got used to the sounds of the Koss. But anyway you are right, low ohm phones do seem to have the best "iron distinction" on the 1236 and also the 1270 vs phones like the Bee's and others.

Tom

 

[Ron from Michigan]

The 1236x I have comes on very late with the threshold also.The Fisher always seem to find that silver coin I passed over.I like CZ but this 1200 series Fisher just works so much better in the iron.