User's Manual

M7X and M7R Page 2-8 Specification
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RF AGC <3 dB change in output from reference sensitivity to +10 dBm
At least 10 dB SINAD with input up to +17 dBm.
Audio AGC <1 dB change in output for 30% to 90% change in modulation depth.
Squelch Carrier operated squelch (with noise compensation and carrier
override). Threshold adjustable from -110 dBm to -60 dBm in 1 dB
steps.
Carrier override 10 dB above threshold setting
Attack time <20 ms
Carrier override and noise compensation can be turned off.
Optional Guard Receiver
The optional Guard Receiver module simultaneously monitors both the VHF 121.500 MHz and UHF
243.000 MHz emergency frequencies. The module’s audio output can be combined with the main
receiver output or routed independently.
To determine whether reception is from the main receiver or guard receiver when listening on the narrow-
band audio lines, the following audio indication is added:
 For VHF guard reception, a single pip is heard every second during reception
 For UHF guard reception, a double pip is heard every second during reception.
The audio pip feature is configurable to be on or off.
Antenna The Guard receiver antenna input can be combined with the main
receiver or routed to an independent antenna.
When combined with the main receiver, the sensitivity of both main
and guard receivers reduces by 3.5 dB.
Sensitivity ≥10 dB at -107 dBm for 30% modulation.