3
We (Igage) sell an excellent Pacific
Crest radio alternative that provides
long range and TrimTalk
compatibility. The price is nearly
$5,600! You can read about it here:
http://www.igage.com/mp/pm3/PacC
restRadiosforPM3.htm.
Considering the price of an
alternative, I think that the factory
radios are great solutions!
Any electronic technician should be able to successfully follow the
instructions in this paper. In any case, I (Mark Silver) am not responsible for
any trouble that you cause!
Background:
The ProMark3 GPS receiver was initially released by Thales Navigation. Thales Navigation was later renamed
‘Magellan Professional’ and in late 2009 was renamed Ashtech LLC, while products continue to be flagged as ‘Magellan
Professional’. Your ProMark 3 GPS may be branded Thales, Magellan Professional or (in the future) something different. I
have referred to the company and product as Ashtech throughout this document.
The Ashtech ProMark3 RTK GPS receiver is a single frequency, dual
constellation (GPS & SBAS ranging) RTK solution. The system is delivered from
the factory with radios that connect to the back of the ProMark 3 receiver and
are powered by the receiver’s internal batteries.
No doubt there was considerable thought in the selection of the radio for
the ProMark 3 RTK application. Tradeoffs include:
License Free FCC License Required
450 MHz 900 MHz 2.4 GHz
Low Power High Power
Runs on Internal Batteries External Batteries Required
No Extra Batteries Long Battery Life Short Battery Life
Short Range (< ½ mile) Long Range (> 6 miles)
Low Cost (<$1000) High Cost (>$4,000)
Small Size and Weight Heavy Radios with big heat sinks
TrimTalk compatibility Proprietary modulation schema
The physics of radio coverage
preclude an ultimate solution: “License
free, internal batteries, long battery life,
long range, Pacific Crest compatibility and
$200 total cost.”
Ashtech chose the Adeunis
(http://www.adeunis-rf.com/) ARF53 data modem.
This radio is a 50 channel, ½ watt, 900
MHz frequency hopping spread-spectrum
UHF radio that runs on 4.5 volts. (If you are
not in North America, the radios and frequencies are slightly different.)
The range of the ARF53 radios is under 1,400 feet in urban environments.
Of course (at least in the Western United States) we would like to be able to
breakdown a 1 mile square section dependably. The ARF53’s don’t satisfy this
requirement when placed 6 feet off the ground (the best we can do with the
delivered cables.)
Documentation for the factory modem can be found with the following
links:
(216 páginas)
(17 páginas)
(84 páginas)
(1 páginas)
(1 páginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
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