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geogecko

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About geogecko

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  1. Finally got some information back on the Motorola FS-Oncore from a distributor. Here is the e-mail. They also sent some design guides and information about antennas. Not a bad price for a small GPS. Ouch, that eval kit is expensive though... Hello Jason, Thank you for your interest in our products. I've attached our antenna price list. The following is the latest information for the FS Oncore: 1. We are currently taking orders for the FS Oncore module, based on the MG4100 GPS chip, eval kit. The lead time for the kit is stock to 8 weeks. 2. The part number is 10001700 a
  2. Thanks for that information. It appears that there was an earlier part, AT45D041A that was a 5V part, but it looks like it might be going obsolete. Actually, I just got done looking at the data sheet on the GPS, and it runs off of 3V as well, so that would be a good fit. The PIC can run off of that voltage as well, so I think that works. I only wish the 4MB part was available in DIP packages. I guess I could just get an SOIC-8 package, and solder little wire wrap wires onto each lead, and then solder it to a DIP-8 socket. That would probably work for development. So, now, I guess th
  3. Well, just when I thought I found the solution to the 200KB GPS operating system requirement (a serial EEPROM from Microchip), I am now back to square one. Microchip specifies their serial EEPROMs in k-bits, not k-bytes, as I assumed they were. So, I found a nice 512KB serial EEPROM that I thought would work, however, its really only 64KBytes. Does anyone know of any 256 or 512 KByte serial EEPROMS either on SPI or I^2C bus? I would prefer to have them in an 8 to 14 pin DIP (.300) package (for prototype purposes), as well as a smaller SMD package.
  4. Well, from the likes of this picture, the Garmin eTrex uses the exact same patch antenna in their GPS units. http://groups.msn.com/rccam/rccamprojectph...oto&PhotoID=126 It looks like their ground plane is no larger than about 35x35mm, so maybe I can get away with that. Regards. Jason.
  5. Thank you all for your replies. I will be able to provide possibly a 25x40mm ground plane, but that's probably it. That being said, how do you go about making the ground plane, and how do you apply the antenna. Is the antenna just stuck to the GP with the included double sided tape? Also, isn't the connector (or pin) coming out of the back side of the antenna (e.g., the side with the tape on it)? So your PCB would have a ground plane, with an isolated plated through hole where the pin would come through, and then that would be soldered on the opposite side of the PCB? I'm just trying
  6. I will check out gpsflight.com tomorrow. Thanks for all the useful information. Actually, I was looking for a passive antenna. The FS Oncore made by Motorola already has an LNA built into it, so you could use a passive antenna if needed. 25mm square, that's about 1 inch. That may be small enough, but the 18mm one sounds nicer, too bad it's non-stock. Anyone know the requirements of mounting an antenna like those? The data sheets talk about a rather large ground plane. I was thinking either same size as the antenna ground plane, or none at all. I think I'll take a look at gpscity
  7. I'm interested in using the FS Oncore GPS modlue from Motorola, and am needing a very small (preferably no bigger than 0.5"x1.0", smaller is better) GPS patch antenna. Does anyone know where to get one? Regards, Jason.
  8. Hmm...guess it requires you to have 200k bytes of ROM in order to store the GPS operating system. That stinks. So much for using just a PIC for an interface, now you need a rather large (256KB) EEPROM or something.
  9. I had a Motorola seminar at work recently, and they skimmed over a new product called the FS Oncore. It's a GPS receiver that measures only 12x16.6mm (i.e., smaller than a US dime). Here is a link: http://www.motorola.com/ies/GPS/ You may have to register to get to the link, as I think I did. Looks like something that might go into a cell phone. I'm considering another project, and have been looking at small receivers. This is the smallest one that I have found to date. I think they even sell patch antennas to go with them. Jason.
  10. Although I haven't been a part of this discussion, I've been following it for a little while now... I'd have to say go SMT. It makes for a much smaller board, and reduces component height. The only thing I might consider is to have a DIP-to-SMT socket for any microcontrollers that would be used, that way, people with "hobby" programmers aren't left to find a way to program the devices. This also lends the ability to develop firmware while using the actual board. Just my thoughts...
  11. Well, I had some time to work on the project some this weekend, and I finally got my camera back from the shop. Thank you for the tips in building it. Now if I can just finish the software part! Jason.
  12. I now have the EEPROM part of the program working properly. Thanks for the tips there. Now. Here is where I've run into an issue with how to do something. I currently have code now that checks for the trip point of the landing lights, a too short pulse, and a too long pulse. I need to add some points (a center stick check point, and full up stick check point, and a full down check point) for the setup routine, however, I am unsure how to go about this. If you look at the code, once it finds a match, I exit out of the checking part of the routine, and do whatever needs to be done. I gu
  13. Thank you for your replies. I cut out my perf board outline last night, now I just need to epoxy some of the components to the board, and solder it all up. I bought some of that 30 AWG wire you are talking about, so that should work well for building the circuit and for the LED wires.
  14. So then do you make a power and ground bus by using a wire or something, or just point to point your power and ground? Also, have you found a good way to attach LEDs to foam models? Pictures would also be nice. Thank you, Jason.
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