Rf Functions - Promax MO-170 Manual De Instrucciones

USER'S MANUAL. MO-170
Test Opt: Selects the test to be carried out. Available options are:
NONE: Normal COFDM output.
CBER: Inject channel bit errors to obtain a non-zero BER before the
Viterbi decoder (Channel BER).
VBER: Inject bit errors to obtain a non-zero BER after the Viterbi decoder
(Viterbi BER or simply BER).
Blank carriers: Blank carriers starting at index Start Carrier and ending at
index Stop Carrier (see section "4.7 TEST parameters").
Pilots only: Generate a DVB-T signal containing pilot carriers only
(continual and TPS).
PRBS/TR 290: Replace the input to the constellation mapper with a PRBS
sequence of length 2¹⁵-1 or 2²³-1 (see PBRS bits entry above) as
specified in document ETSI TR 101 290.

4.5 RF functions.

The selection of this item allows us to access those functions related to the RF
output. Let's review each option.
Frequency: This function allows the selection of the RF frequency. Changes made
by turning the rotary encoder are applied directly to the output, allowing for a
smooth tuning of the output frequency.
When entering this function, the display shows the current frequency and the step
used to modify it, if the encoder is turned. Frequency increments are positive when
turning CW and negative if CCW. The LCD panel looks as follows:
MENU: back PUSH: select TURN: next/prev.
RF Frequency: 650000000 Hz <10MHz>
In this case, the current output frequency is 650 MHz and turning CW one notch
(each notch is marked by an audible tone) will change that value to 660 MHz.
In this situation, each time we press the encoder button, the frequency step will be
modified to 1 MHz, 100 kHz, 10 kHz, 1 kHz, 100 Hz, 10 Hz, 1 Hz and again to 10 MHz,
allowing a cyclic selection of the desired step value.
12/2006 Page 19