Magellan ProMark3 RTK Manual do Utilizador descarregar pdf (Página 4)

Web Page: http://www.adeunis-rf.com/en/products/2-data-modem/27-arf53.html

Manual: http://www.adeunis-rf.com/files/produit/ARF53/EN/ARF53-Modem-data-915MHz-user-guide-V6.pdf

Is an Adeunis Repeater in Our Future?

New firmware was recently released for the ARF53 radio which supports

repeater operation: http://www.adeunis-rf.com/files/produit/ARF53/EN/ARF53-repeater-technical-note-A2.pdf

Since the repeater operation implements a mesh network it would be

possible to deploy several linked repeaters which could enable extremely long

distance communication hauls.

I have heard no rumblings of support for repeater operation. If you think

it would be worth pursuing, let your dealer know so they can rattle the product

manager’s chain.

Changing the Frequency Hop Sequence:

The ARF53 radios use the 33 cm band (902 to 928 MHz) UHF radio band.

This ISM (Industrial, Scientific and Medical) band (see http://en.wikipedia.org/wiki/ISM_band)

has a secondary allocation to Amateur Radio Service and is also used by a lot

(Google ‘900 MHZ Radio Modem’ and checkout the 452,000 matches) of other

uses like:

Amateur Radio Television, Walkie-Talkies, Ricochet Internet modems,

Motorola Canopy radios, XBee 900 MHz modems and most notably

consumer 900 Mhz Cordless Phones.

(I have verified that ProMark3 receivers will not receive corrections if a 900 MHz

cordless phone is in nearby operation.)

If you are located in a country that licenses GSM-900 cellular then the North American

radios won’t work at all for you as they will directly compete and be completely overpowered by

cell phone infrastructure. Alternative frequency range radios should be supplied in your market.

(For this reason, users in South America should not consider purchasing PM3 RTK

from North American dealers!)

A ‘Radio Configuration’ tool on the utility menu allows the end user to

choose between one of 50 preset starting frequencies. (The ‘Utility: Radio

Configuration’ tool sets the ‘Start Channel Number’ for the hopping table register

S201=xx.)

When you choose a channel number, you are NOT choosing a

single operating frequency, but instead you are selecting a

pseudorandom channel hopping sequence known to both the

transmitter and receiver.

Frequency Hopping Spread Spectrum signals (FHSS) are very resistant to

narrowband interference and allow successful operation with other nearby and

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