Findmall.com
 
 






Vintage Detecting Forum


Welcome! Log In Register
Compass VLF MAGNUM DISCRIMINATOR
Posted by: Hybridcruiser
Date: August 13, 2007 02:22PM
Hi everyone ,

One day I was fishing through my van (which I don't drive anymore) and came across a old compass VLF detector..I must of bought it at a rummage sale back in the late 90's for a few bucks..That's about when I stopped driving my van..I was wondering if anyone had any info on this machine which would be much apprecaited...Enclosed is some pictures of this detector...
thanks for your help in advance!!!
hybridcruiser


Re: Compass VLF MAGNUM DISCRIMINATOR
Posted by: UK Brian
Date: August 14, 2007 04:13AM
This was the flagship of the Magnum series and ran at 5.73 kHz. (Magnum 7 Auto 3.7 kHz and 10.5 kHz for the 220,320 and 420 models).

It was the top of range because it was the first detector to eliminate ground effects whilst discriminating against junk at a normal sweep speed (ie not the whipping needed with the early SPD machines such as the Red Baron).
'Detects as deep in discrimination as all metal' according to the ads of the time. Hmmm...

It was a machine you had to learn and upset many as they expected to much.

The pluses were a good range of coils from a 3" probe, 8" stock and a 12" deep hunter.
Tone control. Great if you had any hearing loss.
Trash squelch for high rubbish areas.
If you use high levels of discrimination this machine will pick up small gold whilst in pull tab rejection.

On the debit side... Discrim. was limited in depth. Beyond a few inches bad targets would sound good. Nails could be a real problem as they tend to sink below the range of the discrim. circuit.
If trash squelch was used sensitivity would automatically be reduced.
Weight. It seemed really heavy which was down to the Tri-Planner coils they used at the time.

It would be great if you could get it working and see what you think. It is a hard work machine though and needs the right sites ie little deep iron.

Re: Compass VLF MAGNUM DISCRIMINATOR
Posted by: Hybridcruiser
Date: August 14, 2007 06:06AM
Thank you for your reply It was much help full...I haven't tried to fire it up yet...I have to get some batteries for it over the weekend perhaps..I was thinking of making a new coil using the parts out of the old one and making it into A pin pointer so I can get near the iron poles near the swings in the tot lots ..I know allot of goodies are missed there..It would be a project something I have to think over very carefully..
thanks again
Hybridcruiser

Re: Compass VLF MAGNUM DISCRIMINATOR
Posted by: Joe(TX)
Date: August 14, 2007 02:36PM
Hybridcruiser, try this techique on the Coin Magnum to eliminate the small iron nails! Get an iron nail and using the 10-turn ground control keep adjusting it until the machine nulls out on the iron nail. Use the regular discrimination control to eliminate the normal unwanted non-ferrous targets! I know that this technique works good on the 8 inch coil, not sure about how this would work on the 12 inch coil?...........................HH................Joe

avatar
Re: Compass VLF MAGNUM DISCRIMINATOR
Posted by: rwsnc
Date: August 24, 2007 05:10PM
Quote
Hybridcruiser
Thank you for your reply It was much help full...I haven't tried to fire it up yet...I have to get some batteries for it over the weekend perhaps..I was thinking of making a new coil using the parts out of the old one and making it into A pin pointer so I can get near the iron poles near the swings in the tot lots ..I know allot of goodies are missed there..It would be a project something I have to think over very carefully..
thanks again
Hybridcruiser

I dragged mine out a couple months ago. I, apparently left the old batteries in and of course, a couple leaked. I replaced the battery holders and it's working again. I used to use it a alot about 30 years ago and it's my main detector today (until I figure out which "modern" detector to buy).

MISUNDERSTOOD DETECTOR...................................
Posted by: Joe(TX)
Date: September 06, 2007 06:17AM
I bought one of the original Coin Magnum's back in 1979 or so! And I can tell anyone today that it was considered a major disappointment for the time! ............But It was recieved with much hype! It was one of the few non-motion VLF discriminators that came out on the market. Whites came out with the 6000D and Bounty Hunter came out with the Red Baron both were some of the 1st motion machines but required a fast whipping type action to engage their discrimination circuits! This whipping type motion would either wear one out or one would develope muscles and look like POPEYE!!! Garrett decided not to introduce a motion machine at this time and stayed with their VLF/TR line. Garrett would not release their version of a motion machine till 1982 or so!.......so this was the basic background for 1979..............and many Relic and Deep Coin hunters wanted a deep VLF discriminator but did not like the motion machines of that time! Many bought the Coin Magnum but a lot were also returned. This machine should probably be called a Slow movement detector, best used going very slowly! The biggest gripe was its limited depth in discrimination. A deep nail could register as good because its discrimination circuit was only effective for 2 to 4 inches or so! Although I found a lot of treasures and goodies with mine after about 6 months or so I traded it off!.............For 25 years or so I had many regrets over this..............in this timespan I read many articles about this detector and became convinced that I basicly did not operate it very properly! So I finally re-acquired one and now feel that it is a GREAT DETECTOR. It must be used very slowly and besides using the Discrimination control to reject targets, I also use the GROUND CONTROL to null out any of the small ferrous objects such as small iron nails! This technique seems to work well for me!........................HH..........Joe

avatar
Re: MISUNDERSTOOD DETECTOR...................................
Posted by: rwsnc
Date: September 06, 2007 12:18PM
Quote
Joe(TX)
I bought one of the original Coin Magnum's back in 1979 or so! And I can tell anyone today that it was considered a major disappointment for the time! ............But It was recieved with much hype! It was one of the few non-motion VLF discriminators that came out on the market. Whites came out with the 6000D and Bounty Hunter came out with the Red Baron both were some of the 1st motion machines but required a fast whipping type action to engage their discrimination circuits! This whipping type motion would either wear one out or one would develope muscles and look like POPEYE!!! Garrett decided not to introduce a motion machine at this time and stayed with their VLF/TR line. Garrett would not release their version of a motion machine till 1982 or so!.......so this was the basic background for 1979..............and many Relic and Deep Coin hunters wanted a deep VLF discriminator but did not like the motion machines of that time! Many bought the Coin Magnum but a lot were also returned. This machine should probably be called a Slow movement detector, best used going very slowly! The biggest gripe was its limited depth in discrimination. A deep nail could register as good because its discrimination circuit was only effective for 2 to 4 inches or so! Although I found a lot of treasures and goodies with mine after about 6 months or so I traded it off!.............For 25 years or so I had many regrets over this..............in this timespan I read many articles about this detector and became convinced that I basicly did not operate it very properly! So I finally re-acquired one and now feel that it is a GREAT DETECTOR. It must be used very slowly and besides using the Discrimination control to reject targets, I also use the GROUND CONTROL to null out any of the small ferrous objects such as small iron nails! This technique seems to work well for me!........................HH..........Joe

Joe,
How do you set up the ground balance to null out small ferrous objects. I'd like to try that myself?

Re: MISUNDERSTOOD DETECTOR...................................
Posted by: Joe(TX)
Date: September 11, 2007 10:35AM
RWSNC, 1ST turn the audio discrimination off or set the discrimination dial on zero. Not sure where your Ground Control is set, so turn this dial 10 turns in one direction, now reverse the turns for 5 more times! This should set up the Ground Balance knob in about the Neutral position! Go get a regular size iron square nail and place it on the ground in a metals free area! Using the Ground Control knob turn it in 1 complete rotation to the left, and make a pass over the nail. Continue to do this until there is no positive response from the nail. The detector will just null out, that is it will just go quiet over that nail. Basicly the detector is treating the nail as if it is mineralized soil. Keep in mine that my soil here is Mineral Free so I am not sure what reaction it would have in a very mineralized area? This technique works well for me! In fact I set up my machine this way plus I set the discrimination knob to reject pulltabs and basicly just hunt for the deep non-ferrous targets!................................................HH...................Joe

avatar
Re: MISUNDERSTOOD DETECTOR...................................
Posted by: rwsnc
Date: September 11, 2007 01:02PM
Thanks Joe. Have you noticed if this technique has any affect on depth?

Re: Compass VLF MAGNUM DISCRIMINATOR
Posted by: Compassgirl
Date: December 01, 2007 06:19AM
Why don't you just send the Coil back the our Company that's up and running again
and get it repaired that's the proper thing to do and request a manual for that model Cordually Signed Compass Metal Detector National Dealer

avatar
Re: Compass VLF MAGNUM DISCRIMINATOR
Posted by: rwsnc
Date: December 01, 2007 06:59AM
Quote
Compassgirl
Why don't you just send the Coil back the our Company that's up and running again
and get it repaired that's the proper thing to do and request a manual for that model Cordually Signed Compass Metal Detector National Dealer

Where is your company (address, phone number, website)?

Thanks.

Re: Compass VLF MAGNUM DISCRIMINATOR
Posted by: Compassgirl
Date: December 01, 2007 08:36AM
Compass Electronic's
397 S.W. Stringtown Rd
Forest Grove Oregon 97116
1-(503) 357-2111
Tuesday - Saturday
Between 1PM to 5PM

Sorry, only registered users may post in this forum.

Click here to login