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This is a very good point! The base onto which my compass is mounted was made from aluminum and the small dc motor is mounted at the very bottom of it and not to the compass itself. Internally I think the compass is somewhat shielded. The current seems to have no effect on my compass, but it is something to make note of. (three feet seems a bit much though) > Subject: Re: [PSUBS-MAILIST] a tech tip > From: MerlinSub@t-online.de > To: personal_submersibles@psubs.org > Date: Sun, 29 Jun 2008 11:29:00 +0000 > > > And make shure that the dc moror and his cable is > at least 90 cm (3 feet ) away from the magnetic compass.. > Otherwise the magnets and the field of your motor has an > influence on the compas.. > > :-0 > > regards Carstren > > > "David Bartsch" <dbartsch2236@hotmail.com> schrieb: > > > > If you are not satisfied with the operations of your standard compass in that slow turns produce jumpy needle movements with frequent stops, try this on for size: > > > > Mount the compass on a isolated platform that is shock mounted with rubber feet. On this platform firmly adhere a small dc motor using silicone sealant. Take a small spindle type pulley as is used in a small belt drive and with a dremel tool grind off one side so as to make the motor out of balance. (Not much is needed) Try it in operation. > > You should notice a drastic improvement in the smooth operation of your compass even in slow turns. This small vibration should not be such as to blur your ability to view the heading indications or make any audible noise , but enough to shock the unit into constant operations without any sticking points or slow responses. > > The power source for the compass lighting should be enough for this small added feature. > > > > Any added thoughts or comments? > > _________________________________________________________________ > > Earn cashback on your purchases with Live Search - the search that pays you back! > > http://search.live.com/cashback/?&pkw=form=MIJAAF/publ=HMTGL/crea=earncashback > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. Your email address appears in our database > because either you, or someone you know, requested you receive messages > from our organization. > > If you want to be removed from this mailing list simply click on the > link below or send a blank email message to: > removeme-personal_submersibles@psubs.org > > Removal of your email address from this mailing list occurs by an > automated process and should be complete within five minutes of > our server receiving your request. > > PSUBS.ORG > PO Box 53 > Weare, NH 03281 > 603-529-1100 > ************************************************************************ > ************************************************************************ > ************************************************************************ > Need to know now? Get instant answers with Windows Live Messenger. IM on your terms. |