Sailor R1120 User Manual

PRINCIPLE OF OPERATION cont.:
The BAND CONTROL unit selects the correct VCO- and HARMONIC FILTER range.
Inside each 2 MHz band the programmable figure PI, is encoded from the
KEY BOARD CONTROL unit in BCD code representing the frequency within the
2 MHz band.
Start figure: 2000 + Pi; 04P1 &I999
Stop figure: SI = -609
N, = 2000 + Pl - S, q P1 + 2609
Output frequency from Loop 1:
fLOl = m x 2 MHz + (PI + 2069) x 1 kHz; 7rmd18
l
LOOP 2
The voltage controlled crystal oscillator (VCXO) generates the necessary
local oscillator signal to SECOND MIXER. The VCXO is in the Loop 2 system
phase locked to the internal 10 MHz reference frequency.
The phase locked loop principle is the same as for the Loop 1 system. The
only difference is that there are two mixers in the feed-back path, where
the one injection signal is a fixed 10 MHz 0~ 16 MHz signal and the other
one fCL is the CLARIFIER signal.
The CLARIFIER has a frequency variation of 2150 Hz which results in a
2150 Hz variation of the VCXO frequency fLO2.
Principle of programming:
The frequency shift in Loop 2 is controlled from the 0.1 kHz code from the
KEY BOARD CONTROL UNIT.
The PROGRAMWBLE DIVIDER counts up from the start figure P2 to the stop
figure S2.
The 0.1 kHz code controls the start figure P2 to the PROGRAMMABLE DIVIDER.
Start figure: OhP2rz9
Stop figure: s2 q 20
Dividing figure: N2 = S2 - P2 q 20 - P2
12

Sailor R1120 Specifications

General

Brand	Sailor
Model	R1120
Category	Receiver
Language	English