MXT noise crackling threshold

[Brian Fiske]

Hi to all

I have a MXT 300 and have noticed that the thresh hold lately seems to have a lot of static to it or like a crackling sound. Is this normal ????????

This may not be new I have just started to use my head phones and it is very apparent with them on.
It makes it very distracting with head phone.

I tried to see if I had a bad connection and when I unhooked the plug from the coil to the control box the threshold smoothed out to a hum.

Any input would be very much grateful

Brian

 

[B.T]

Um, not sure what your problem machine wise is but i have seen some horror results from disconnecting and reconnecting coil plugs whilst the machine is still running. I have seen machines fried because of it in the past. Might not affect the MXT like I saw it do to other detectors but it is a practice I would wholly recommend against doing.

 

[BarberBill]

Check my response on the general White's forum.
BB

 

[Hillbilly Bob]

I don't have any crackling sound in mine.......

 

[Monte]

1.. It's possible, although not probable, that it is an issue with inferior headphones or a poor plug contacts.

2.. You didn't mention which headphones, but the most likely cause is high-quality headphones combined with the MXT's somewhat 'raspy' and crackly audio Threshold. Sometimes it might be noisier in Relic mode than in Coin & Jewelry mode, although one of my four MXT's was just the other way around.

The nature of the audio is one reason why many like the M6b for coin hunting. It's "silent", so to speak, and is designed with the Tune set just below the point of an audible threshold sound. I often set my MXT for just the slightest of audio, which can tend to be a little "crackly", or just into the quiet zone. That is, unless I am hunting in the All Metal Prospecting mode.

Monte

 

[Coinseeker 78]

It is possible that you have your gain set to high or the trigger forward on the relic mode. You may not have noticed the crackling until you put on your headphones. But then again you may have a problem with the headphones which has already been mentioned. The crackling sound can depend on which coil you are using and normally is smoothed out by adjusting the gain in most cases. That works for me.

 

[Rob (IL)]

Since it goes away when you disconnect the coil, it's not the phones or phone jack connection. The MXT is one sensitive machine. The threshold on the MXT , as Monte has said,"can tend to be a little "crackly". Once you remove the coil you have removed the antenna and the machine has no input to amplify. You said you didn't notice it before the phones. Is it still noisy if you don't use the phones?

On my MXT in C/J mode with the trigger centered I always get what some people ( non MXT users) call crackly, not smooth like the old 6000 detectors. When I put it in relic mode center position it is much smoother. Without hearing it I don't know if there is anything wrong. Rob

 

[Brian Fiske]

Thanks to all that gave me great input.

I had the crackling nose with and with out the headphones, I don't think they are the problem.

I changed the batters and check all the connection and it has smoothed out the threshold. It like when you take your car to the shop and when you get there it dos not make the nose.

I think it was a few things like low batteries and high gain, so I will watch that and see if it happens again.

Thanks again to all, your always a big help

BRIAN