Re: GSM High Gain Antenna

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Article #563

#563

From: John Henderson
Date: Sat, 22 Feb 2003 20:01

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"Jeremy Quirke" wrote:

> The TA is actually an 8-bit field, not a 6-bit field, however
> the maximum allowable value for DCS1800 and GSM900 is 63
> (00111111b).

I still call 6 usable bits in a byte, a 6-bit field :-)  But if
it's defined as 8 bits with 2 reserved, then you're absolutely
right of course.

> At 270833+1/3symbols/sec, light (radio) would travel
> c/[270833+1/3]m, so a value of 63 would result in a maximum
> two-way distance of 63c/[270833+1/3] = ~7x10km (70 kilometres)

Thanks for working through the fine detail.  Completely ignoring
transmitter power and receiver amplifier gain, what's the
theoretical maximum range of a cell using paired timeslots?  Is
it about 140 km (280 km round trip)?  Or does some timing
constraint related to the use of the timeslot pair erode that
down to the 121 km maximum claimed for enhanced extended range?

John

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From: "John Henderson" <jhenRemoveThis@bigpond.com>
Newsgroups: aus.comms.mobile,aus.cars.offroad
Subject: Re: GSM High Gain Antenna
Date: Sun, 23 Feb 2003 07:01:02 +1100
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