GB1 Pulse Width

Ismael and all,

It seems the SD2000 can produce a “Long Tx Pulse Width\" around 210 usec with standard Xtal frequency of 1.8 Mhz to 2.0 Mhz running its Ground Balance set in “Search” position, unless I am wrong..

Any idea of the SD2000's \" Long Tx Pulse Width\" when set in Balance 1 position only, with same Xtal frequency as above?

Gary<br><br>Post edited by: GaryQ, at: 2006/07/19 16:40

G'day once again Ismael,

Definitely seems I am the Lone Ranger at this forum when it comes to posting. I was asked on a new Aussie forum that started up, if I still had my SD2000 now that I was persuaded to buy a mates GP3000. I was happy to keep running my GPM after it pulled my biggest nugget yet until my detecting mate wanted to upgrade his 2200 to a 3000, so I stepped and bought his 2200 box. I ran it for some time without success except for a couple of tiddlers. Mate than bought the 2200 back to persuade me to upgrade to a 3000. Since running the 3000 I have only slightly increased my nugget haul with nothing above the 2 gram mark but have found the smallest nuggets yet using the 3000's in sens. mode with 11\&quot;DD.

My mate and I are planning a testing session drilling hole at 45 degrees inground and run an all out test with the 3000, 2200 and 2000GPM to satisfy my curiousity

Thanks for your reply Ismael and is now a couple of weeks since you posted. Just wondering mate have you put your 2000 under the scope yet for those pulse widths in Balance 1.

Gary,
I took some pictures of the waveform at the gates of the switching fets and the long pulse is very close to 210 usec long. I'm not sure which crystal was switched in at the time though but it was one of the slowest.

The pulse lengths are dictated by the crystal selected and the channel selector switch position doesn't influenced these lengths in any way .
Rob.