HM-Funktechnik GmbH 70RX-S1 User Manual
3.
Port description and technical data
Mute
Mute output of the modul
Open collector output to recognize a radio carrier, mute threshold
at about –116dBm for 20dB SINAD CCITT (if the signal is less
than -116dBm 0.0 V, else 4.6 V), the hysteresis is 1-2dB
at about –116dBm for 20dB SINAD CCITT (if the signal is less
than -116dBm 0.0 V, else 4.6 V), the hysteresis is 1-2dB
RSSI
Field strength indicator of the received carrier
the released DC voltage is proportional to the field strength (typ.
0.8 V DC at -120 dBm and 2.7 V DC at - 65 dBm input level)
0.8 V DC at -120 dBm and 2.7 V DC at - 65 dBm input level)
Audio
NF output of the modul, 1 Vss (at a nominell frequency deviation of
2,5 KHz) with a DC offset of about 2 V, frequency range 0 Hz - 5
KHz (DC capable), inverted
2,5 KHz) with a DC offset of about 2 V, frequency range 0 Hz - 5
KHz (DC capable), inverted
TX/RX
not connected at this modul
Vdd
Power supply of the modul
5 – 11 V DC stabilized, minimum voltage 4.6 V (f.e. 4x 1.2 V NiCd
or NiMH), absolut maximum voltage 12 V, 78x12 not recommended
because of voltage variation, internal low drop voltage stabilization
to 4.6V, no reverse voltage protection
or NiMH), absolut maximum voltage 12 V, 78x12 not recommended
because of voltage variation, internal low drop voltage stabilization
to 4.6V, no reverse voltage protection
MOD
not connected at this modul
LD
Lock detect output of the modul
Open Collector output shows if the internal synthesizer is locked or
not (3.3 V if locked, else 0.0 V)
not (3.3 V if locked, else 0.0 V)
GRD
Ground of the modul (also connected to the complete case)
D0 – D7
Frequency setting of the modul
Output of the lowest possible frequency, if not connected.
Grounding of the pins D0 - D7 will higher the frequency stepwise
(D0 12.5 KHz, D1 25 KHz, D2 50 KHz,..., D7 1.6 MHz). The
easiest way of an implementation is the use of a DIP-switch, which
is connected with one side to ground and the other side to DO –
D7. A frequency list to find your desired frequency is available at
our homepage.
Grounding of the pins D0 - D7 will higher the frequency stepwise
(D0 12.5 KHz, D1 25 KHz, D2 50 KHz,..., D7 1.6 MHz). The
easiest way of an implementation is the use of a DIP-switch, which
is connected with one side to ground and the other side to DO –
D7. A frequency list to find your desired frequency is available at
our homepage.
Supply current
25 mA (+ / - 2mA)
Sensitivity
at least –121dBm (for 12dB SINAD measured with CCITT filter)
Data rate
max. 9600Bd
Antenna
λ
/4 – whip antenna (teflon), optional SMA, SMB or MCX
Frequency accuracy
+ / - 1.5 KHz
Temperature stability
+ / - 2.5 KHz (- 20°C .. + 55°C)