Receiver DQM120

Digital television requires significantly few- er measurement parameters to evaluate the quality of the transmitter output signal. Broadcasters and Network Operators are increasingly interested in knowing the real performance of terrestrial DTT networks, critical especially after the introduction of SFN transmission. The DGQoS Meter allows operators to accurately verify the quality of signals received in viewers’ homes emulating the reception quality of set-top boxes and TV set.

The DGQoS Meter performs a significant amount of measurements: RF signal level, MER, BER in key decoding spots and PER.

Functional modes

  • Sequencing Mode: Connects to the internet thru 2G/3G or DSL and remains in this condition. Monitors programmed channels in round robin mode.
  • Real Time mode: Used to monitor in real time all available Data points. The user sends a request, the answer from the probe is sent as soon as possible which usually means a few seconds (channel power, MER, BER) to about a minute (constellation diagram, Echo pattern).

Sequencing and real-time mode

There are 2 ways of operating the probe in normal mode: SCAN and REAL TIME.

In SCAN, the probe sequences thru the programmed channels and logs the data to the control center. The amount of data is user programmable. SCAN mode can be switched to REAL TIME.

Once in REAL TIME the probe awaits user commands. The probe becomes a slave, it answers any user queries. The probe returns to SCAN mode automatically after a user programmed amount of time if no further command is received.


Bandwidth: 6 / 7 / 8 MHz

Input level: -20 / -65 dBm on 75 Ohms

MER: 20 dB / >38 dB

Resolution: ±0.1 dB

Precision: ±1 dB

Band: 48 MHz to 862 MHz in DVB-T / T2 and ISDB-T / Tb


Ethernet: RJ45

Connector: 1 x F - 75 Ω antenna IN

Connector: 1 x F - 75 Ω loop through


Constellation Pattern

Channel Impulse Response

MER carrier per carrier

Percentage bars for MER, BER

Signal Power Bar graph

SFN Window

Channel power, wireless modem reception


Communication: SNMP, HTTP, Telnet Protocol

Standard: DVB-T / T2 - DVB / C - ISDB / T

Operating temperature range: 0 - 50 °C

BER pre-Viterbi: resolution down to 1 x 10-8

BER post-Viterbi: resolution down to 1 x 10-6

FTP server: for accumulated data download and firmware upgrade (optional)

Mobile data connection: 2G / 3G

Local data on a 3’’ touchscren monitor

TPS monitoring and comparing of all TPS parameters (fft, code rates, guard interval etc..) included reserved TPS content


Supply voltage: 9 - 14V AC / DC

Power: 5 W (7 W avg during mobile transmission)


DQM-120 DVB-T/T2 Monitoring Receiver