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Old Mar 31, 2013, 06:59 PM
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Mini-HowTo
DJI NAZA GPS - PepsiCola's SAW filter mod

This thread is for discussion of my SAW filter mod to the NAZA GPS. This mod works for all the NAZA GPS units (including the Wookong). It was originally developed and tested on the NAZA-M GPS and might need some small changes for the other units. This mod solves the problem many of us have been having with these GPS units: we don't get satellite lock when the unit is close to our VTx or noisy electronics like the GoPro. With this mod, I have my GPS directly next to the antenna of my 1W 1.28GHz VTx, and I still get more than 7 satellites solidly locked throughout my flights.

For full details of the mod, please visit http://pepsicolarc.blogspot.com/2013...ilter-mod.html.
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Last edited by PepsiCola; Jul 01, 2013 at 01:11 AM. Reason: moved main content to http://pepsicolarc.blogspot.com
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Old Mar 31, 2013, 07:45 PM
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You rule.
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Old Mar 31, 2013, 08:23 PM
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Thank you Sir .!!
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Old Mar 31, 2013, 09:13 PM
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Great I been having the same problem ! Will be ordering filters . Thanks for the info !!
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Old Mar 31, 2013, 09:23 PM
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Awesome work! I have to admit I am thoroughly displeased with DJI over this. Skimping on a 2 dollar part on a $350+ system is ridiculous! I say a recall is in order.
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Old Mar 31, 2013, 09:36 PM
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Nice, I bet an industrious person with the skills, could make a little cash modding GPS units for people or selling pre-modded units.

-X
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Old Mar 31, 2013, 09:51 PM
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PepsiCola,
Did you presolder the wires onto the SAW filter before attaching it to the board. And did you then tack it onto the right pads? Thanks.
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Last edited by thekubiaks; Mar 31, 2013 at 09:53 PM. Reason: found the answer in the OP
Old Mar 31, 2013, 09:56 PM
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Quote:
Originally Posted by thekubiaks View Post
PepsiCola,
Did you presolder the wires onto the SAW filter before attaching it to the board. And did you then tack it onto the right pads? Thanks.
I didn't presolder the wires but that might have been easier - just be super careful when you try to bend the wires after you've soldered them on because the pads on the filter will shear off very easily with even the slightest pressure.
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Old Mar 31, 2013, 10:33 PM
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Suggest you put it on your blog so it can be found easily.
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Old Mar 31, 2013, 10:45 PM
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Awesome job PepsiCola! Thank you for the post. Filters ordered.
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Old Mar 31, 2013, 11:53 PM
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Thank You for the how to. I also just ordered some 3 just in case and some new tips for my XYTronic I 68-3c solder station , 1/64" should do it.
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Old Apr 01, 2013, 12:04 AM
PGR
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Quote:
Originally Posted by thekubiaks View Post
PepsiCola,
Did you presolder the wires onto the SAW filter before attaching it to the board. And did you then tack it onto the right pads? Thanks.
Quote:
Originally Posted by PepsiCola View Post
I didn't presolder the wires but that might have been easier - just be super careful when you try to bend the wires after you've soldered them on because the pads on the filter will shear off very easily with even the slightest pressure.
I haven't done this mod yet but I have done quite a few mods like it and here's my suggested procedure:
  1. Cut the trace and clean the enamel off of places you'll be soldering to.
  2. Solder the three pieces of solid wire to the appropriate places on the GPS board.
  3. Anchor the filter with some adhesive film or servo tape.
  4. Trim and bend the pieces of wire so they make contact with the appropriate pads on the filter.
  5. Solder the wires to the pad.

For a wire source you might consider a single strand out of a piece of stranded wire. I think THHN 14 AWG will probably have the right size strands and it's available from most hardware stores.

As I already said, I haven't actually done this yet so there could be something I'm missing, but after studying the photos I don't think so.

Pete
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Old Apr 01, 2013, 12:08 AM
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Thanks Pete! That's an excellent set of suggestions for how to approach the soldering.
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Old Apr 01, 2013, 12:28 AM
PGR
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Quote:
Originally Posted by PepsiCola View Post
Thanks Pete! That's an excellent set of suggestions for how to approach the soldering.
It's you who deserves the thanks, Pepsi! You did the R&D.

Pete
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Old Apr 01, 2013, 02:47 AM
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Thanks for sharing, good stuff, stamp of approval !
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