Find's Treasure Forums
Welcome to Find's Treasure Forums, Guests!
You are viewing this forums as a guest which limits you to read only status.
Only registered members may post stories, questions, classifieds, reply to other posts, contact other members using built in messaging and use many other features found on these forums.
Why not register and join us today? It's free! (We don't share your email addresses with anyone.) We keep email addresses of our users to protect them and others from bad people posting things they shouldn't.
Click here to register!
Need Support Help?
Cannot log in?, click here to have new password emailed to you
Eric Foster's, Pulse Power Discriminator One, No Motion, Ferrous & Non-Ferrous by Meter
- Thread starter vlad
- Start date
OldBeechnut
Well-known member
[size=large]A couple of True Classics.....Maybe someone here can share a little history on these two machines, Thanks................Joe[/size]
I don't think it was a 1984 design. The previous model, the C400 Deepscan came out around 1979. This had a similar looking control box, three coils, VCO added for ease of pinpointing. Silver paper was rejected automatically and ring pulls could be identified from gold rings by tone at the lower power settings. Three power settings....low, medium and high ( 7 inches, 12 inches, 16 inches on a 2 pence coin which is a fraction bigger than a U.S. quarter ). The PPD1 that followed a couple of years later had a detection range claimed of 10 inches on a 2 pence but only had a 20 cm co-axial coil compared with the rather large stock coil of the Deepscan.
I can't remember a white button to knockout pulltabs. Ferrous/non-ferrous indication was provided by a centre zero meter. The target VCO signal was fed to either the internal speaker or headphones. The two controls alongside the meter were on/off combined with audio level and a meter centre control. A battery test button was underneath the meter box from what I remember.
A big feature (as well as the iron rejection) was the fact it drew only (only !) 170 mA from its eight 1.5 volt D cells. This was considered really good at the time. Weight with batteries fitted was 2 kg.
Drawback was that the discriminating meter was, I assume, Induction balance driven not P.I. so didn't have the depth or ability to cope with salt/black sand like the primary pulse search mode.
I can't remember a white button to knockout pulltabs. Ferrous/non-ferrous indication was provided by a centre zero meter. The target VCO signal was fed to either the internal speaker or headphones. The two controls alongside the meter were on/off combined with audio level and a meter centre control. A battery test button was underneath the meter box from what I remember.
A big feature (as well as the iron rejection) was the fact it drew only (only !) 170 mA from its eight 1.5 volt D cells. This was considered really good at the time. Weight with batteries fitted was 2 kg.
Drawback was that the discriminating meter was, I assume, Induction balance driven not P.I. so didn't have the depth or ability to cope with salt/black sand like the primary pulse search mode.
vlad
Well-known member
It had two factory loops, one was a non discriminating by meter 11 inch; if you look at the other it uses a Garrett Deepseeker Co-ax housing which I think was
a tri-planar concentric. The meter worked fine for ferr/non ferr in salt, but any thing more than the slightest mineral caused it to read conductive targets as ferrous.
a tri-planar concentric. The meter worked fine for ferr/non ferr in salt, but any thing more than the slightest mineral caused it to read conductive targets as ferrous.