Equipment information
Drake R-4 Receiver
Manufacturer:
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Model:
R-4
Date:
Category:
Group:
Description:
Communication Receiver
Information
The Drake R-4 is an extremely versatile communication
Receiver designed to bring you every feature desirable for
the ultimate in the reception of all modes of amateur
communications.
It provides a linear permeability tuned VFO with 1 KC
readability, and premixed injection with crystal controlled
high frequency Oscillator for stability on all bands. A 100
KC crystal calibrator is built-in.
An improved passband tuner/filter with four selectivity
positions, and a built-in notch filter are incorporated to
provide the desired selectivity and interference rejection,
and a noise blanker is built-in for elimination of most
noise on CW, SSB and AM .
As supplied, the unit gives complete coverage of 80, 40, 20,
and 15 meter bands as well as the 28.5 MC to 29.0 MC portion
of 10 meters.
Ten accessory crystal sockets are provided for coverage of
other 500 KC frequency ranges between 1.5 and 30 MC such as
160 Meters, MARS frequencies, WWV, shortwave broadcast, etc.
These sockets can be programmed to give up to 5 MC of
continuous coverage for convenient use with V.H.F. converters.
The R-4 also includes time proven Drake AVC with fast attack
slow release for SSB or AM and fast attack fast release for
CW. If desired, the AVC can be disabled altogether for CW
reception.
Complete AVC action and accurate S-meter indication can be
obtained on all modes. A crystal lattice filter following
the first mixer provides excellent overload characteristics
by providing selectivity before gain producing stages.
When used with our T-4 Reciter, transceive operation may be
obtained and when used with the T-4X transmitter, either
transceive or independent receive and transmit functions are
possible.
Manual Type:
Service and User Manual
Pages:
40
Size:
2.50 Mbytes (2623681 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2017 08 09
MD5:
01fa5e4d98bac576cacfdc0de07e2b16
Downloads:
506
Information
General Specifications 3
I General Description 5
II Installation Instructions 6
A. Unpacking 6
B. Location 6
C. Power Requirements 6
D. Antenna Requirements 6
E. Speaker Requirements 7
F. Anti Vox 7
G. Muting 7
III Control Functions 8
A. Front 8
B. Rear Controls & Jacks 10
C. Side Controls & Jack 11
IV Operation 12
A. Preliminary Control Settings 12
B. Single Sideband or Double Sideband Suppressed Carrier
Reception 12
C. C.W. Reception 12
D. AM Reception 13
E. RTTY Reception 13
F. Adjusting Dial Calibration 14
G. Noise Blanker Operation 14
H. Operation of Notch Control 15
I. Accessory Frequency Coverage 16 J. Fixed Frequency
Operation 19
V Theory of Operation
A. R.F. Amplifier 20
B. First Mixer and Premixer System 20
C. Second Converter 2 1
D. 50 KC I.F. System 2 1
E. Detector Systems 21
F. Audio Output 24
G. AVC System 24
H. S Meter 24
I. Noise Blanker 25
J. Crystal Calibrator 25
K. Power Supply 25
VI Service Data 27
A. Removing Top Cover 27
B. Removing Bottom Cover 27
C. Tube Replacement 27
D. Troubleshooting 27
VII Alignment Instructions 32
A. 50KC Oscillator Alignment 32
B. 50 KC I.F. Alignment 32 C . Crystal Filter and Filter
Match Transformer
Alignment 33
D. 5595 KC Oscillator Alignment 33
E. Antenna, RF, and Injection Circuit Alignment 34
F. V.F.O. Output Coupler Adjustment 35
G. 100 KC Calibrator Alignment 35
H. V.F.O. Adjustment 35
I. Notch Filter Alignment 35 J. Passband Tuner Alignment 35
K. Checking Crystal Oscillator 36 L. Bias Adjustment 36