From: Andrew McGregor <andrewmcgr@gmail.com>
To: Dave Taht <dave.taht@gmail.com>
Cc: thumbgps-devel@lists.bufferbloat.net
Subject: Re: [Thumbgps-devel] antennas and such
Date: Sun, 18 Mar 2012 12:30:00 +1300 [thread overview]
Message-ID: <A202705F-65E0-426A-BECB-A7698A92AA1F@gmail.com> (raw)
In-Reply-To: <CAA93jw7O8WeiXNBLNVcYJ4SdG7r955KOKb+8th+Le4+=wfhMPw@mail.gmail.com>
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So extend the serial side. Serial cable is MUCH cheaper than RF cable.
On 18/03/2012, at 7:20 AM, Dave Taht wrote:
> I'm fully aware that adding an external antenna can blow the costs out
> the window. However, getting a gps receiver with integral antenna to a
> window is something of a problem. So far as I know 5 meters is the
> outer limit without active regeneration of the signal.
>
> http://reviews.ebay.com/USB-Cable-Length-Limitations-and-how-to-break-them?ugid=10000000001067998
>
> I have no idea how usb 'active regeneration' works or if it can affect latency.
>
> So moving onto the antenna problem, I note that the length of a patch
> antenna has a direct relationship as to the quality of it's signal,
> so this is a determining factor as to the overall size of the dongle.
>
> (this is a most-excellent manual, and has details that apply to all gps designs)
>
> http://www.u-blox.com/images/downloads/Product_Docs/LEA-6_NEO-6_MAX-6_HardwareIntegrationManual_%28GPS.G6-HW-09007%29.pdf
>
> There are also outboard antennas with varying features (like the
> ability to be mounted oddly) and active antenna designs. I don't know
> enough about the active antenna designs to know if they can be powered
> by a usb source.
>
> --
> Dave Täht
> SKYPE: davetaht
> US Tel: 1-239-829-5608
> http://www.bufferbloat.net
> _______________________________________________
> Thumbgps-devel mailing list
> Thumbgps-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/thumbgps-devel
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prev parent reply other threads:[~2012-03-17 23:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-17 18:20 Dave Taht
2012-03-17 23:30 ` Andrew McGregor [this message]
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