??? from a Tek swinger

[detectingMO]

Considering a 705 coming from super fast swinging greek/g2 teknetics platform. What is the average to max swing speed for hf 10x5 and mf 10.5 coils in very mild dirt? EMI experiences around buried power on 7.5 frequency? Thanks for help.

 

[Mark in S.E. IA]

Do not swing any faster then a 3 to 4 sec speed. any faster and you will miss the deep old coins. as far as EMI, most times I do not have a problem with it, but some times you do.

 

[Canewrap]

Swing speed does not require fast swinging and EMI is not a real issue since there is a noise cancel feature.

 

[detectingMO]

EMI is a problem for 7.5khz and noise cancel is no different than frequency shift which does no good around power EMI and 7-8khz. Just curious if vlex helps at all at for this freq vs tek greek series. I don't want to swing slow, so does the 705 require slow swing all the time or just in trash bad ground like any other machine? I've read Randys book. Looking for more first hand specific info.

 

[Old Longhair]

You don't need to swing slow to detect a potential target, but....swinging too fast will cause falsing and inaccuracies. Subsequent passes over a target will often reveal it to not be what it first indicated if you're sweeping too fast.

Why do you need to sweep fast? Are you in a race?
I'm reminded of the story about the old bull and the young bull. The young bull says, "Let's run back to the barn and have our way with a cow". And the old bull responds, "Let's walk back and have our way with them all".

 

[detectingMO]

Lol that's a good one! I just mean if it requires 1ft a sec I'd probably not be to inerested. But if 2 ft sec isn't too bad and then focus in slow after a hit or in trash I'd be good with it. 705 has everything else I enjoy. Tones, coil options, light, etc

 

[Old Longhair]

Two ft/sec is OK at sites w/o much trash, but you'd want to slow down to sort through heavier debris.
I sweep about six feet, and I go 3-4 seconds per pass. If I go much faster I can't be careful enough about overlapping.

 

[detectingMO]

That's definitely doable. Appreciate the help. If my g2 doesnt play the way I'm hoping I'll be trying a 705 gold.

 

[pescadore]

I always had issues with EMI when using Tek and Fisher machines but the noise cancel on the 705 is pretty effective and I rarely ever have EMI issues. i pretty much use a moderate swing speed and slow down when I get a good signal.

 

[Digdoggy]

I sometimes sweep a bit fast and will still get a " blip!" Short response on any solid signal. I then sweep slowly over the hit and check it.

 

[detectingMO]

Thanks for all the info. sounds like it could work for me if I should go that route. Read mix info on IDing targets at depth. Seen video of great ID at +10" buried target depth. Read info on drop off after 6" call goodies iron. That doesn't seem to make sense. I'm used to ID accurate until cut off with the tek machines. Although that cut off is more like 8" buried depth.

 

[atomicscott]

YES! The 7.5 khz frequency does suffer more from EMI when using my X-Terra. 2 particular parks I hunt have very bad EMI, requiring me to lower sensitivity quite a bit.When switching to the 18.75 khz 6" DD, the I was able \to run at max (or close) sensitivity at these parks.

 

[Digdoggy]

I havn't had an issue with the 5x10 18.7 khz or the digger with EMI and was right next to a power grid with many high overhead power feeds. It gave me a little lauder threshold and just a bit scratchy. Did an auto NC and calmed it right back to normal quiet operation. I would think this like other matters may depend on a few variables. Most often around power lines overhead the humidity can conduct and draw the current. Depending on moisture content it may even amp or broaden the EMI. If the airs moisture content could draw amps snapping aloud out in the air I'm pretty sure it'll carry the EMI further and stronger than arid conditions. Just a thought...