CZ-70 Pro Maiden Voyage & Questions

[Cal_Cobra]

I met up with a friend at Golden Gate Park yesterday to see if the CZ-70 would do as I anticipated it would in a heavily hunted park next to an extreme EMI nightmare.

I'm happy to report that as far as EMI was concerned it was rock solid and stable with a sensitivity setting of 6 using the 10.5" coil. Depth was good, as I found it going deeper then my F70 at the same park. The F series machines don't do well under certain EMI situations, such as with Sutro tower a main communications tower in San Francisco that outputs VHF, UHF, FM and DTV with a collective power output of 24,242.7kW that's about a mile away from Golden Gate Park.

I found the coil bobbing ground balance procedure to be a piece of cake (it would GB right at 3). I ran it with nothing notched, sensitivity of 6, and volume set to 10 to take advantage of the "audio boost" capabilities.

I noticed that the depth readings were typically inaccurate for shallow targets when the CZ-70 indicated them to be at 0" - 2" (they would typically be far deeper).

I ended up with a silver Washington Quarter, five wheaties, a pile of clad and a multitude of relics (and trash too of course). Pretty good for a pounded park.

One thing that drove me nuts was it's propensity to ID screw caps in the high coin TID zone. Anyone have any ideas how to accurately ID screw caps to prevent digging them ?

I did run into an issue. Once and a while the LCD display would go bonkers with random characters. Fiddling with the settings or using the pinpoint function would sometimes bring it back to normal, but mostly I'd have to power cycle to reset it. It's not horrible, and I could live with this, but if there's a remedy I'd like to apply it. Any idea what's happening here?

Thanks,
Brian

 

[joe dirt_1]

sounds like you did pretty good for hunting in a hard hunted site. i have had my cz70 for about 2 months now but haven't got to use it much because of the heat. i did go out with it today to a couple of old sites but only got about 1.50 in clad. i have noticed so far that when it locks on nickels you can bet you have a nickel under your coil. i'm still not sure of the relic icon and what coins are going to fall under it. so far everything has been square tabs or some other piece of trash. i have never had any problems with emi in the places i have hunted with my cz70.....it's rock steady. no idea how to help with the bottlecap issue but i will be watching for replies to your question. my guess would be the sound they make would be the only way to tell them from a coin... i think a coin will sound a little more softer in sound.... but that is just a guess. never had my display mess up on me yet...that would worry me i think. so far i really like my cz70... it will find coins deep and id's them pretty accurate. good luck with you cz 70............roger

 

[Dan-Pa.]

As far as the issue it appears you have a unit malfunction or perhaps have the sens. set too high for your area, doubt if it is EMI as CZ's have little or no problems with EMI at least in my neck of the woods.
Do remember your depth is set for coin size objects and a can or perhaps a small piece of foil will not give accurate depth.
Relic on older CZ's was square tab so indeed it will include tabs along with real old indian head pennies $5 dollar gold pieces, half dimes and other oddball coins along with many tokens or smaller sterling silver items and yes even a rather large 10kt gold ring..Usually pay attention to relic in real old areas as tabs will cause lots of digs in newer areas.
As far as screw caps they come whole, bent and even flattened out but usually especially shallow ones seem to cover much more area than a coin and are louder. We must remember they are not all made of the same metal and do come in various configurations as stated above so this may vary but sure a good way to cut down the odds of digging one.
All in all I feel you had a sucessful hunt as CZ's are generally user friendly to setup but take many trips to become proficient with them.

 

[Cal_Cobra]

Thanks for the tips. I'm going to take the CZ70 back to GGP tomorrow with the 5" coil and see if I still get the display issue. Perhaps it's the 10.5" coil? I'm hoping the 5" coil will have excellent separation and I can find a few old coins missed by others with larger coils masking targets.

hh,
Brian