Thanks Chuck, That helps, I think. I'm at the point where I just need to make a decision but 4K isn't enough to make the decision I want to make.
On Tue, Dec 27, 2022 at 5:07 PM Chuck McCown via AF <af@af.afmug.com> wrote: > Most if not all of them locate the signal based on current flowing on a > conductor. So you put a signal on a trace wire or cable shield. Ground > the far end. The transmitter is connected to the cable and a ground rod. > That flow of signal sets up the magnetic field and that is what the locator > works off of. If you have trace current then all of them will do a good > job. The type of soil doesn’t make much difference. The super cheap ones > will find it as easy and the super expensive units. Finding a reliable > depth is more difficult. The only brand I have every used where I could > trust the depth was a Metrotel. But even the cheapest unit can find depth > by locating a null, orienting the pick up coil at 45 degrees and then > finding the null off to the side of the of the cable. Distance from the > center null to the side null is the depth. > > The higher the power the farther you can locate. But that just means you > don’t have to move the transmitter so much. In my experience I am > generally within a quarter mile of the transmitter or less and all of them > will do that distance. > > Some of them will also passively locate 60 cycle power. Some of them > locate based on radio signals picked up by wires and pipes and > re-radiated. I have had limited success with that on high pressure gas. > > Many of them have an RF mode where you connect to some object to track but > the far end is not grounded. So you just have a capacitive coupling > between the thing you want to locate and the earth. Not much current flows > so you do not get much distance. For example a fish tape down a plastic > duct is located this way. But you will only get dozens or perhaps hundreds > of feed if you are lucky. > > Multiple frequencies have their uses. Older units were down in the > audible range like 800 Hz. You can go a very long way with those > frequecies. But they also bleed off to other cables and pipes. Higher > frequencies are better to get finer resolution but they do not transmit as > far. 82 or 84KHz is a popular frequency. > > Some brands put a coded signal out so only their receiver can pick up the > signal. Rycom is one of those. > > *From:* Carl Peterson > *Sent:* Tuesday, December 27, 2022 3:30 PM > *To:* AnimalFarm Microwave Users Group > *Subject:* Re: [AFMUG] Underground Locating units > > Thoughts on a used R7200 off of ebay vs something like a new Ridgid SR-24? > Trying to do this with a 4K budget. Is a locator either good or bad or is > there a middle ground where they don't work well. > > On Thu, Dec 8, 2022 at 3:30 PM Steve Jones <thatoneguyst...@gmail.com> > wrote: > >> there is also the vermeer lin of locators. massive option set, LM42 is >> pretty efficient and can find most things in the ISP domain. SPX25 is good >> for locating shallower thing. stuff like the 10x15 or 20x22 utility locator >> are surprisingly accurate for it having to be pretty pinpoint. But if you >> really want to be certain about finding the utilities on a smaller ISP >> budget, youd want to look at Bobcat brand locators, those will find >> everything. >> >> On Thu, Dec 8, 2022 at 3:17 PM Carl Peterson <cpeter...@portnetworks.com> >> wrote: >> >>> Any consensus on locators? We need to buy a new one too. The only one >>> I really know is the T5. We don't do a ton of locates so it doesn't need >>> to be too high end. >>> >>> On Fri, Dec 2, 2022 at 2:34 PM Jason McKemie < >>> j.mcke...@veloxinetbroadband.com> wrote: >>> >>>> I'm looking at getting one of these: >>>> >>>> https://www.ridgid.com/us/en/sr-24-line-locator-with-bluetooth-and-gps >>>> >>>> >>>> On Fri, Dec 2, 2022 at 8:59 AM Nate Burke <n...@blastcomm.com> wrote: >>>> >>>>> I'm looking to pickup a 2nd locating unit. Without visiting a bunch >>>>> of >>>>> websites and wading through tech docs, does anyone have >>>>> recommendations? USIC around here uses a blue unit, but they're >>>>> always >>>>> so covered with spray paint I can't see the name/model. We have an >>>>> Amprobe AT-3500 today. Looks like Amprobe has a newer model out, >>>>> that's >>>>> cheaper than the AT-3500 >>>>> >>>>> Mainly need to locate either a tracer wire (alligator clips) or >>>>> traceable fiber (Clamp) >>>>> >>>>> -- >>>>> AF mailing list >>>>> AF@af.afmug.com >>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>> >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>> >>> >>> -- >>> >>> Carl Peterson >>> >>> *PORT NETWORKS* >>> >>> 401 E Pratt St, Ste 2553 >>> >>> Baltimore, MD 21202 >>> >>> (410) 637-3707 >>> -- >>> AF mailing list >>> AF@af.afmug.com >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > > > -- > > Carl Peterson > > *PORT NETWORKS* > > 401 E Pratt St, Ste 2553 > > Baltimore, MD 21202 > > (410) 637-3707 > > ------------------------------ > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- Carl Peterson *PORT NETWORKS* 401 E Pratt St, Ste 2553 Baltimore, MD 21202 (410) 637-3707
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