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TABLE 1-1. RA6790/GM HF RECENERSPECIFICATIONS
Frequency Range
Frequency Resolution
Frequency Tuning
Frequency Indication
Frequency Sta9i1ity
Detection Modes
Gain Control Modes:
AGC
0.5 kHz to 29.999999 MHz
1 Hz increment
By keyboard entry or continuous tuning with seiectable rates,
FAST (1000
Hz),
SLOW (30 Hz), and FINE
(1
Hz)
increments; .
BFO continuous in 10 Hz increments.
8 digit electronic readout of tuned frequency to 1 Hz; 3 digit
and sign readout of BF» relative to IF center ±8.0 kHz.
±5 parts in the 10 8 per
10
0
C temperature increment over the
range of OOC to 50
0
C using internal 5 MHz reference oscillator.
Provision for an external 1, 5 or 10 MHz reference input/output.
o
dBm nominal into 50 Ohms.
CW/Al Continuous Wave; CW/A2 Modulated Continuous Wave;
USB/LSB (upper/lower sideband) A3A, A3H, A3J, A2A, A2H,
A2J;
AM/
A3 Amplitude Modulation; A4 (Facsimile) ISB/ A3B
Independent Side Band (optional); FM/F3 Telephony.
Control Range: An increase of
110
dB above AGC threshold
will result in a change of output of less than 3 dB.
Threshold Range (preset): -113 dBm to -100 dBm
Time Constants:
Attack:
Decay: Short
~edium
Long
20 msecs
<
30 msecs
200
+
100 msecs
3.75 seconds ±
1.
25 msecs
y{anuall
Automatic Gain Control
Provision is made on the front panel to select. and by use of the
RF Gain Control, to manually control the AGC threshold any-
where within the range of 110 dB above the preset AGC threshold
level.
Input Impedance
50 ohm nominal, 2:1 VSWR Type N Connector
Synthesized BFO
455 ±8 kHz in 10 Hz steps
Noise Figure
<
15 dB
Dynamic Range
RF:
>
i 80 dB/Hz
1-6
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