MFJ MFJ-8621, User Manual

Page: 3 / 15

MFJ-8621 Data Radio
2
TECHNICAL SPECIFICATIONS (Typical Unit):
Receiver:
Frequency Coverage................. 144-148 MHz
Sensitivity....................................... 0.6
µ
V for 12 dB Quieting
Image Rejection.......................... -45 dB or better
1st IF................................................ 10.7 MHz
2nd IF.............................................. 455 KHz
1st LO............................................. Crystal , 3rd overtone
2nd LO............................................ 10.245 MHz
Selectivity....................................... -6 dB at 20 KHz (data-passband filter)
AFSK Output................................. Unsquelched, 0dBm @ 3.0-KHz deviation
Current Drain.............................. 25 mA
Transmitter:
Frequency Control.................... Crystal, 18-MHz x 8
FSK/AFSK Input level.............. 150 mV p-p @ 1200 baud, .8 V p-p @ 9600
Deviation........................................ 0-5 KHz, adjustable at TNC
RF Power Output....................... 4.0 - 5.0 Watts into 50 Ohms
VSWR Tolerance....................... 3:1 Max.
Current Drain.............................. 1.0 Amp @ 13.8 Volts
Figure 1 Block Diagram of MFJ-8621 Data Transceiver