WTT Delta Pulse for Whites TM-808 without Cave mode

[Jim in Idaho]

Want to trade as stated in title

[Jim in Idaho]

I decided I only need the coils, so even if your 808 doesn't work, it may still be trading fodder...thanks Delta pulse is really deep on relics. Comes with 3 coils including a 1 meter square you suspend from your shoulders.
Jim.

[Bottlebum]

I've got a like new, Discovery Electronics, Treasure Finder 900 automatic.

[kt315]

I've got a like new, Discovery Electronics, Treasure Finder 900 automatic.

TF900 is a copy of TM-800. it has not CAVE mode, because schematic of TM-808 is different than TF900 one (TF1200 is a copy of TF900).

[Jim in Idaho]

TF900 is a copy of TM-800. it has not CAVE mode, because schematic of TM-808 is different than TF900 one (TF1200 is a copy of TF900).

TF900 in Trace mode still sees non-ferrous, and ignores near-surface large iron....I have both the 900 and 1200
Jim

[kt315]

sorry but Trace mode is just with specific attachment. can you show it me?

[Jim in Idaho]

sorry but Trace mode is just with specific attachment. can you show it me?

I'm way out in the mountains prospecting. But you're incorrect. Trace mode performs very much like Cave mode in the TM-808. No attachment needed. It also ignores large iron in that mode, to some extent. It's all mentioned in the owners manual, KT.
Jim

[Jim in Idaho]

Hey KT....I have a question on the TF900/1200. Since Trace mode, with the attachment, works at 73.5khz, and the TR mode is also activated in Trace mode, does that mean the TR mode also operates at 73.5khz, or can TR operate at it's own, separate, frequency alongside the Trace mode? Iveca, or other engineers feel free to answer, also. Thanks
Jim.

[kt315]

ok. i see your native is english so you will read patent easely. for a PIPE seeking, not for the gold mask.

[Jim in Idaho]

Thanks, KT! So, the upshot of all this is the T/R (trace) mode, if a person is not using the special tracing boxes, is operating at the same frequency (12.5khz) as the all-metal mode. The advantage the TM-808 W/Cave mode has is that when in the Cave or T/R mode it has iron discrimination. The Treasure Finder series do not have that in either mode. Thanks again for the help.
Jim

[kt315]

also, i have to add. there are 'earlier' TM-808 and 'last' TM-808. in last one Whites deleted CAVE mode (the switch) from the housing. so if you are seeking with CAVE mode you have to know the fact.
i put pics.

[Carl-NC]

So, the upshot of all this is the T/R (trace) mode, if a person is not using the special tracing boxes, is operating at the same frequency (12.5khz) as the all-metal mode.

I don't think so. AM mode is a VLF-GB mode that uses a synchronous demod. Cave mode and trace mode are both TR modes that use the peak detector so they likely both run at 73.5kHz. The trace box accessory is just a copy of the 73.5kHz TX oscillator so you can separate the TX coil from the main box, lay it on the ground, and use it to "passively" energize a buried pipe (passive coupling). You can also directly attach it to an exposed pipe (direct coupling).

The White's TM has a confusing history. I believe the TM600 was made by Karbowski (his company name was "3D Electronics") for White's. Then Karbowski licensed the design to Discovery who made the TM800 for White's. Then White's decided to do the manufacturing themself and created the TM808, which was identical to the TM800/TF900, including the TR Cave mode. Discovery complained about White's using their design, so White's redesigned the TM808 to use a CM6000 circuit and dropped the cave mode. So there are 2 different TM808 models, with and without cave mode. If you get the one with cave mode, you are getting a copy of the TF900.

[Jim in Idaho]

I don't think so. AM mode is a VLF-GB mode that uses a synchronous demod. Cave mode and trace mode are both TR modes that use the peak detector so they likely both run at 73.5kHz. The trace box accessory is just a copy of the 73.5kHz TX oscillator so you can separate the TX coil from the main box, lay it on the ground, and use it to "passively" energize a buried pipe (passive coupling). You can also directly attach it to an exposed pipe (direct coupling).

The White's TM has a confusing history. I believe the TM600 was made by Karbowski (his company name was "3D Electronics") for White's. Then Karbowski licensed the design to Discovery who made the TM800 for White's. Then White's decided to do the manufacturing themself and created the TM808, which was identical to the TM800/TF900, including the TR Cave mode. Discovery complained about White's using their design, so White's redesigned the TM808 to use a CM6000 circuit and dropped the cave mode. So there are 2 different TM808 models, with and without cave mode. If you get the one with cave mode, you are getting a copy of the TF900.

yeah...I'm starting to get this. Running at 73.5khz in Trace, with the TF1200, give me a really "noisy" image with the data logger, regardless of the settings I have on the 1200. That higher frequency appears to see much more ground minerals, and it shows in the image. I tried turning the gain and threshold completely down, and still get a much noisier image than I get in all metal. Operating at 73.5khz might explain that. Thanks, Carl! Hope your field work is going well. I feel bad I couldn't get you the 5000. As an aside....I found out there are two boxes associated with the Trace attachment. One is the "transmit", and the other attaches to the receive coil on the TF900. Finding that out explained the pic I remembered seeing of a box attached to one of the antennae.
Jim

[kt315]

So there are 2 different TM808 models, with and without cave mode. If you get the one with cave mode, you are getting a copy of the TF900.

sorry, not. So there are 2 different TM808 models, with and without cave mode. If you get the one with cave mode, you are getting a copy of the TM-808 that has CM6000 circuit's Disc mode.
also, TM-800 is TF900, circuit is same.

[Jim in Idaho]

also, i have to add. there are 'earlier' TM-808 and 'last' TM-808. in last one Whites deleted CAVE mode (the switch) from the housing. so if you are seeking with CAVE mode you have to know the fact.
i put pics.

Yes...I know that, KT. The one I had included cave mode. Without Cave mode, a TM-808 doesn't help me much over the TF units I have, for what I'm doing. That iron Discrimination, in cave mode on the TM-808, really helps in what I'm doing. I bought a 6000 XL Pro (waiting on arrival) and am going to do some experimenting with that unit. It Also runs at 6.59khz, but has all the features the TM-808 lacks. I/m going to see if I can put separate Trans/Rec coils on it. Might be interesting. I'm going to need help from you engineers for that project. I thought I might use the coils (antennae) from an 808 , or TF unit.
Jim