Any of you guy's have/or used the 12 inch DD coil for the 1200 series detector..

[razerback408]

[size=medium]The Double D coil was brought to market by "Compass", they developed it and were the first to offer it.

Never in my life heard that special circuitry was required to make use of one.

Ask yourself, the coil being nothing more than an antenna, when have you ever heard of special circuitry being needed when switching from one antenna to another?

As always, the antenna should be matched to the unit for the best performance.
(same as with CB radios, you use an SWR meter and "trim" the antenna, the goal being a 1 to 1 match)
[/size]

thank you iam a ham and i have made alot of antennas and you could take a Teknetics Omega 8000 coil change the end with a 1270 end and it should work

 

[Dave J.]

Nope.

--Dave J.

 

[MarkCZ]

[size=medium]The Double D coil was brought to market by "Compass", they developed it and were the first to offer it.

Never in my life heard that special circuitry was required to make use of one.

Ask yourself, the coil being nothing more than an antenna, when have you ever heard of special circuitry being needed when switching from one antenna to another?

As always, the antenna should be matched to the unit for the best performance.
(same as with CB radios, you use an SWR meter and "trim" the antenna, the goal being a 1 to 1 match)
[/size]

Well a while back I had read some information on the internet about the DD design coils (history of them) in that it stated that is was actually a OLD design and that several companies experimented with the design but most just shelved the idea because they felt that the design theory was good but the companies couldn't get what they wanted out of the design due to the electronics of that era.
Well, years later with the much newer age of the electronics and the now present computerized processors the double DD coil design was un-shelved and put into production with a much greater level of success.
One problem with the DD coil in its early design was it flopped in areas of high trash and to this day they are still thought of in this way, people still say that a concentric coil is MUCH better in areas of high trash, but really the DD's now our many times better than the DD's of the early design (due to the newer electronics and the more modern ability to manage the signals)
Its not really "Special Electrics" I guess, well maybe it is, in that the newer electronics has a greater ability in processing power than those earlier TR machines. The TR machines really were even more so like a 2-way radio. Then newer computerized electronics really was the open door for the DD coils.

Mark

 

[razerback408]

[size=medium]The Double D coil was brought to market by "Compass", they developed it and were the first to offer it.

Never in my life heard that special circuitry was required to make use of one.

Ask yourself, the coil being nothing more than an antenna, when have you ever heard of special circuitry being needed when switching from one antenna to another?

As always, the antenna should be matched to the unit for the best performance.
(same as with CB radios, you use an SWR meter and "trim" the antenna, the goal being a 1 to 1 match)
[/size]

Well a while back I had read some information on the internet about the DD design coils (history of them) in that it stated that is was actually a OLD design and that several companies experimented with the design but most just shelved the idea because they felt that the design theory was good but the companies couldn't get what they wanted out of the design due to the electronics of that era.
Well, years later with the much newer age of the electronics and the now present computerized processors the double DD coil design was un-shelved and put into production with a much greater level of success.
One problem with the DD coil in its early design was it flopped in areas of high trash and to this day they are still thought of in this way, people still say that a concentric coil is MUCH better in areas of high trash, but really the DD's now our many times better than the DD's of the early design (due to the newer electronics and the more modern ability to manage the signals)
Its not really "Special Electrics" I guess, well maybe it is, in that the newer electronics has a greater ability in processing power than those earlier TR machines. The TR machines really were even more so like a 2-way radio. Then newer computerized electronics really was the open door for the DD coils.

Mark

the new machines are like a repeater not a 2-way radio

 

[Fisherfinder]

[size=medium]Here is some back up for my statement that "Compass" was the first when it comes to the Double D coil.


Starting with the Admin of the Compass forum, plus.......

Jim Straight
John Earle
Allen Cannon[/size]




Gary
Reply | Threaded | More star
Nov 21, 2008; 6:11pm
Re: THE RAREST COMPASS............................
Gary
Administrator
396 posts

Hi Snaps, most people don't know this but a Compass engineer actually invented the double D coil, I can't remember his name but his initials were D.D. I know they put the DD coils on the AU 2000 and AU 52 models. Speaking of the AU 2000 I may have to cast a vote here for the AU 2000 as the rarest Compass machine. I've never seen one for sale. I'm not sure but I think this model came out towards the end of the Compass company.

Gary

<->

Rick K
Reply | Threaded | More star
Selected post Nov 22, 2008; 11:37pm
Re: THE RAREST COMPASS............................
Rick K
14 posts

Compass developed autotune and Compass, developed the DD coil.
(The engineer at this time was Don Dykstra and his initals were DD)

The above info from Jim Straight,

Google the various compass machines and you'll get a lot of good info from the archives of various forums.

I have an AU-52 and look forward to trying it on "micro jewelry" when I get back to the U.S. next year.

<->

John Earle

 

[MarkCZ]

[size=medium]Here is some back up for my statement that "Compass" was the first when it comes to the Double D coil.

Did somebody say that Compass wasn't the first to use the DD coil?

Mark

 

[Fisherfinder]

Did somebody say that Compass wasn't the first to use the DD coil?

Mark

[size=medium]The first to "use" the DD coil?


Maybe read my post again.......


The founder of Compass, Don Dykstra, "Invented" the Double D coil and that coil design bears his initals.

And as for the need for computerized circuitry to make them viable, you may concider that Compass had no such circuits, they were truly old school.

And yes their units, decades old in their design, still out perform many of the modern units of today.[/size]

A point driven home by the fact that many users go to great lengths, and expense, to aquire Compass machines that were made in the 1970's and 1980's even though we are on the verge of hanging up a 2013 calender.

.

 

[MarkCZ]

A point driven home by the fact that many users go to great lengths, and expense, to aquire Compass machines that were made in the 1970's and 1980's even though we are on the verge of hanging up a 2013 calender.

.

They call this a "Cult Following"
I don't know all the vintage detectors that fall into the "Cult Following Class" I know some of the early models of the Teknetics do,
The Eagle,
The Mark I's
The company for these is LONG gone! but people still pay a steep price to get a good one..

Mark

 

[Fisherfinder]

.

They call this a "Cult Following"
I don't know all the vintage detectors that fall into the "Cult Following Class" I know some of the early models of the Teknetics do,
The Eagle,
The Mark I's
The company for these is LONG gone! but people still pay a steep price to get a good one..

Mark[/quote]


[size=medium]Honestly I can't see anyone spending good money on a machine that isn't a good finder.

Detectors are like rifles. With rifles it has been said, "Only accurate rifles are interesting".

With detectors it's the same, "Only detectors that perform well are interesting".

Like rifles, many of the top performing detectors are older ones. Some aren't that pretty, but they perform well.


Keith Wills, his father, and his brother, all used, and still use, a Teknetics Mark 1. These are guys that could use "any" machine they care to,...... but the Mark 1 got the nod.

That is high praise from what amounts to the highest authority on the subject of detector performance.


I have a Mark 1, it works really well.
>[/size]

 

[C.J.M.]

i have one of those rare 5x10" ellp. concentric coil, but its not a d.d.coil,also have a rare water concentric coil for the 1266x and one for the cz-5

 

[skookum]

High,
Here is a very good article from George Payne on coils.

"Quote":

There is a difference between the standard round and DD loops. On the coils I designed for Discovery I don

 

[Joseph in Alabama]

n/t

 

[Joseph in Alabama]

the Detech site has this coil and severall more for the 1200 series advertised on there web site.....joe