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Understanding channel select on radio test example

Hello Nordic team,

I am trying to get my product read for FCC/CE compliance testing. I came across the radio_test example and other examples posted on DevZone. I have the following queries.

1) The Test lab wants me to test the product in 2402MHz, 2442MHz , 2480MHz. They want me to transmit in these frequencies separately. In the example channel is set to sweep from 0 to 80. Is it safe to assume that 0 is LOW; 40 is MED and 80 is HIGH? I am planning on doing a single channel sweep using 

radio_tx_carrier(txpower_, mode_, channel);
radio_tx_sweep_start(txpower_, mode_, channel, channel, delayms_);

txpower_ and mode_ are the default values. 

2) I do not have a spectrum analyzer, the infocenter piece explains that we can use a another board with the same example. Would this be in  rx_sweep mode? i am not very familiar with RF just yet so the more information provided would help me greatly.

Appreciate your time,

Tandon 

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