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solid state broadband design, fully synthesized with a permeability tuned
oscillator (PTO) for smooth, continuous tuning. Covers the complete range
10 kHz to 30 MHz
with no gaps in frequency coverage Digital frequency readout.
Special front-end circuitry, Triple
conversion Super heterodyne, IFs 4805 kHz, 5645 kHz, 50 MHz
Complete front-end bandpass filters are included that operate from
HF thru VLF.
External VLF preselectors are not required.
10 dB pushbutton-controlled broadband preamp
can be activated on all ranges
above 1.5 MHz. Low noise design.
Various selectivity filters for
CW, RTTY and AM are switch-selected
from the front panel. Standard Filters: 2,3 KHz, 1,8 KHz, 0,5 KHz, 0,3
KHz.
Special new low distortion "synchrony-phase" a-m detector
provides
superior International shortwave broadcast reception This new technique permits 3 kHz a-m
sideband response with the use of a 4 kHz filter for better Interference rejection.
Tunable IF Notch filter
effectively reduces heterodyne interference from
nearby stations.
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he famous Drake full electronic passband tuning system is employed, permitting
the passband position to be adjusted for any selectivity filter. This is a great aid in
interference rejection.
Three agc time
constants plus ‘Off" are switch-selected from the front panel.
Complete
transceive/separate functions when used with the Drake TR-77 transceiver are included,
along with separate R-77 R.I.T. control.
Special multi-function antenna selector/50 ohm splitter
is switch-selected from
the front panel, and provides simultaneous dual receive with the TR-77. This makes
possible the reception of two different frequencies at the same time Main and alternate
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antennas and vhf/uhf converters may also be selected with this switching network.
The built-in power supply operates from 100,120,200, 240 V-ac. 50/60 Hz, or nominal
13.8 V-dc.
The digital readout
of the
R-77 may be used as a 150 MHz counter, and is switched from the front panel.
Access thru rear panel connector
The R-77 includes a built-in speaker,
or an
external Drake MS-7 speaker may be used.
Built-in 25 kHz calibrator for
calibration of analog dial.
Low level audio output for tape recorder.
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Optional accessories available
Model 7023 Drake SL-1800 SSB/RTTY Filter, 1800 Hz
Model 7024 Drake SL-6000 AM Filter, 6.0 kHz
Model 7026 Drake SL-4000 AM Filter, 4.0 kHz
R577 cabinet
Source : R.L. DRAKE - DRAKE R-77
RF-7 IF Selectivity Board Filter Location
0,3 kHz - 0,5 kHz - 2,3 kHz - 4 or 6 kHz
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