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Re: Ricochet update- Auction

Get a spectrum analyzer and set up an isolated conducted
path and measure the power out.  These units vary by as much +/- 1.5 dBm.
Check the published spec.  If you have a unit on the low side you can use a
higher gain antenna as long as the Power ERP does not exceed 36 dBm.

If you are mounting the unit on the roof and you have a cable run you will
have additional loss due to the cable and the connectors. If you measure
this loss, you can compensate by increasing antenna gain.  The real issue is
getting an adapter from the Ricochet to a standard RF connector.
----- Original Message -----
From: "Thomas Edwards" <>
To: <>
Sent: Wednesday, August 15, 2001 7:26 AM
Subject: Re: Ricochet update- Auction

> On Tue, 14 Aug 2001, Michael Paine wrote:
>
> > so you are saying that since Ricochet is 30 dBm, does that mean if
Cringely
> > has a 7 dBi (for point to point), that would be ok?  That would mean I
would
> > need to antennas for a setup that did both point-to-point and
> > point-to-multipoint, no?
>
> My impression is (in the US under Part 15) that a 30 dBm spread-spectrum
> transmitter can only have a 6 dBi antenna, period.  If you wanted a 7 dBi
> antenna, you would need to reduce the power of the transmitter by 1 dB or
> 0.3 dB depending on point-to-multipoint or point-to-point, respectively.
>
> Cringely is using an Airport, which is only 15 dBm, so he can use up to a
> 21 dBi antenna (15 dBi for the 30 dBm, then the 6 "free" dBi above that).
>
> -Thomas
>
> Thomas Edwards          The Sync
>       Video for the Net Generation
> http://www.thesync.com
>
>
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