http://wiki.paparazziuav.org/w/index.php?title=GPS/Antenna&feed=atom&action=historyGPS/Antenna - Revision history2024-03-28T09:05:01ZRevision history for this page on the wikiMediaWiki 1.37.1http://wiki.paparazziuav.org/w/index.php?title=GPS/Antenna&diff=14252&oldid=prevFlixr at 00:04, 30 January 20132013-01-30T00:04:42Z<p></p>
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</table>Flixrhttp://wiki.paparazziuav.org/w/index.php?title=GPS/Antenna&diff=14250&oldid=prevFlixr at 00:04, 30 January 20132013-01-30T00:04:05Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [http://www.sarantel.com/products/geohelix-p2 GeoHelix-P2] Passive GPS Antenna [[http://www.sarantel.com/downloads/specifications/geohelix-p2.pdf datasheet]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [http://www.sarantel.com/products/geohelix-p2 GeoHelix-P2] Passive GPS Antenna [[http://www.sarantel.com/downloads/specifications/geohelix-p2.pdf datasheet]]</div></td></tr>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">To obtain a GPS receiver for use with your Autopilot board, take a look on the [[Get Hardware]] page.</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
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</table>Flixrhttp://wiki.paparazziuav.org/w/index.php?title=GPS/Antenna&diff=14249&oldid=prevFlixr: Created page with "== Antenna options for the Tiny and Paparazzi GPS units == The '''Tiny 1.1''' features a 28mm square ground plane intended to be centered below the [[#Sangshin_13mm_Pat…"2013-01-30T00:03:49Z<p>Created page with "== Antenna options for the Tiny and Paparazzi GPS units == The '''<a href="/wiki/Tiny" title="Tiny">Tiny 1.1</a>''' features a 28mm square ground plane intended to be centered below the [[#Sangshin_13mm_Pat…"</p>
<p><b>New page</b></p><div>== Antenna options for the Tiny and Paparazzi GPS units ==<br />
<br />
The '''[[Tiny|Tiny 1.1]]''' features a 28mm square ground plane intended to be centered below the [[#Sangshin_13mm_Patch|Sangshin 13mm patch antenna]]. Much better performance has been seen with the 18mm antennas and an augmented ground plane. The ground plane is a critical part of the antenna affecting not only the gain and polarization characteristics but also the center frequency of the system. Users are advised to expand the ground plane to approximately 36mm square, centered on the ceramic portion of the antenna (not the pin). This can be done with copper foil soldered to the vias of the existing ground plane.<br />
[[image:gps_antenna_comparison.jpg|thumb|500px|left|SAM-LS 25mm / Emtac 20mm / Emtac 18mm / Sangshin 18mm / Sangshin 13mm / Sarantel P2]]<br />
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=== Sangshin 18mm Patch ===<br />
[[image:Sangshin_18mm.jpg|thumb|Sangshin 18mm x 4mm 1580Mhz]]<br />
The Sangshin KSA-ST1580MS18 antenna has proven to offer the best performance of the currently available options. These are available from any Sanshin distributor such as [http://www.rfmw.com rfmw] ([http://www.rfmw.com/PortalProductDetail.aspx?ProdId=232436&fmt=1 here]) and cost approximately $6.50/ea. in small quantities.<br />
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=== EMTAC 18mm Patch ===<br />
[[image:Emtac_18mm.jpg|thumb|Emtac 18mm x 4mm 1580Mhz]]<br />
Offering identical performance to the Sangshin in a less attractive package is the Emtac 18mm antenna. The part number for the standard 1580MHz 18x18x4mm is ANA1580T18D40 and is not listed on their website. Other frequencies are available on a special order basis and the 1584Mhz has proven to outperform all other frequencies when used with a 36mm ground plane and no radome. The use of a radome (any material covering the antenna) or a larger ground plane should theoretically favor even higher frequencies.<br />
<br />
'''Availability'''<br />
<br />
* [http://www.transplantgps.com/modules.html TransplantGPS] in MN, USA. The 1580Mhz models are usually available at a cost of $3.55ea but there may be a minimum order requirement of ~$50 USD.<br />
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=== Sangshin 13mm Patch ===<br />
<br />
[[image:Sangshin_13mm_onboard.jpg|thumb|Sangshin 13mm x 4mm 1580Mhz]]<br />
Part of interest: '''[http://www.sangshinec.com/eng/patch_spec.htm KSA-ST1580MS13]'''<br />
<br />
The Tiny 0.99 (not 0.9) and 1.1 were designed around this antenna but users are advised to install 18mm units for better performance.<br />
<br />
Size: 13 x 13 mm<br/><br />
Center Frequency: 1580 MHz<br/><br />
Bandwidth: 5 MHz<br/><br />
@Fo: -15 dB<br/><br />
GAIN (dBi): 0 dBi<br/><br />
Ground Plane: 50 x 50 mm<br/><br />
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'''Available From'''<br />
<br />
[http://www.systroninc.com/ Systronic INC.] - Alberta, Canada<br />
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=== Emtac 20mm Patch ===<br />
<br />
[[image:Salvaged_20mm_onboard.jpg|thumb|Emtac 20mm x 4mm]]<br />
The Tiny 0.9 was designed around this 1583Mhz antenna and performed extremely well. Emtac has replaced this with an 18mm model that they claim offers even better performance.<br />
<br />
* Obsolete<br />
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<br />
=== Spectrum Control Patch ===<br />
<br />
[[image:PDC_Tiny21_S1.jpg|thumb|Spectrum Control 25mm]]<br />
25mm patch testing on Tiny v2.1. Manufacturer Part Number [http://www.specemc.com/docs/antenna_catalog.pdf PA251575008SALF]. These are available from Mouser for about $3: [http://www.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMukjKvgqb7HxzmcutVCLrkxFUj/3HCdKwE%3d 657-PA251575008SALF]<br />
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=== Sarantel GeoHelix-P2 ===<br />
<br />
[[image:Geohelix-p2.jpg|thumb|Sarantel Geohelix P-2 1575Mhz]]<br />
<br />
This antenna is popular among UAV designers due to it's natural rejection of other radio frequencies such as those originating from the modem or video system as well as it's improved rejection of signals reflected from the ground. U-blox recommends this antenna and features it in their [http://www.u-blox.com/news/sarantel.html reference design]. Frequency and polarization are not dependent upon ground plane geometry so this antenna is sold only in the true GPS frequency of 1575Mhz.<br />
The geometry makes this antenna very inconvenient to mount, especially in an airplane. Some very non-scientific testing has been done with one of these antennas connected to a Tiny with a short length of 50 Ohm coax above a 120mm square of ungrounded aluminum foil and performance was adequate. The helical design should theoretically outperform a patch in the air, but not on the ground, so any organized comparison will be difficult. Possibly the most important aspect of this antenna is it's natural RFI filtering, which should be evaluated further.<br />
<br />
* [http://www.sarantel.com/products/geohelix-p2 GeoHelix-P2] Passive GPS Antenna [[http://www.sarantel.com/downloads/specifications/geohelix-p2.pdf datasheet]]<br />
<br />
<br />
= Acquiring =<br />
<br />
To obtain a GPS receiver for use with your Autopilot board, take a look on the [[Get Hardware]] page.<br />
<br />
[[Category:Hardware]] [[Category:Sensors]]</div>Flixr