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Heathkit Mobile Receiver HR-20
HR20
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Circuit Diagram, Service
Manual, Service
Information, Schematic Diagrams and Manuals |
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For Repairing, Restoration and
Servicing of Vintage and Modern Electronic Equipment |
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Manual
with Circuit
Component Values &
Alignment
Details Below
As a Download
Click Here
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Heathkit Mains Power Supply HP-20 Click
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Heathkit Mobile Transmitter HX-20 Click
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Heathkit Mobile Receiver HR-20
HR20
Description
The HEATHKIT Model HR-20 Mobile Receiver is designed to receive SSB, AM, and CW signals on the 80 through 10 meter amateur bands.
Although this Receiver is intended primarily as a companion unit for the Model HX- 20 Mobile Transmitter, equally good results may be
obtained in fixed-station applications when the proper power supply and antenna are provided.
The 8-tube circuit of your superheterodyne Receiver has a basic sensitivity of less than one microvolt at a usable signal-to-noise ratio.
A geared-down dial mechanism provides
smooth accurate tuning of the slide-rule scale for each band.
Sharp selectivity and good image rejection are obtained in the 3 mc IF circuit by using a
hermetically-sealed lattice-type crystal filter.
Also an AVC controlled “S” meter is provided on the front panel to indicate received signal strength.
There are connectors on the rear panel of the Receiver for a 50-75 ohm
antenna, operating and control voltages, 8 ohm speaker, and 500 ohm earphones.
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HR-20 Receiver
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Manual
with Circuit
Component Values &
Alignment
Details Below
As a Download
Click Here
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Specifications
Frequency Coverage
80 Meters - 3.5 to 4.0 megacycles.
40 Meters - 7.0 to 7.3 megacycles.
20 Meters - 14.0 to 14.35 megacycles.
15 Meters - 21.0 to 21.5 megacycles.
10 Meters - 28.0 to 29.7 megacycles.
Intermediate Frequency 3 megacycles.
IF Crystal Filter Mid-frequency 3.0 megacycles.
Bandwidth - 3.0 kilocycles ±200 cps at 6 db maximum.
Bandwidth - 10.0 kilocycles at 60 db minimum.
Sensitivity 1 microvolt or less, at 10 db signal-to-noise ratio.
Panel Controls
SB1-SB2.
RF GAIN.
AF GAIN, power OFF.
CW/SSB-AM.
NOISE LIMITER OFF-ON.
AVC, OFF-FAST-SLOW.
Main Tuning.
BAND switch.
ANT TUNING.
Rear Panel Connectors
Antenna (ANT) 50-75 ohms.
Power (PWR).
Speaker (SPKR) 8 ohm.
Earphones (PHONES) 500 ohm.
FUSE.
Meter Front panel “S” meter indicates received signal strength.
Tube Complement
6BZ6 - RF amplifier.
6EA8 - Mixer-oscillator.
6BZ6 - First IF amplifier.
6EA8 Second IF amplifier and "S" meter amplifier.
6BE6 - Product detector - BFO.
6BJ7 - AM detector - AVC - noise limiter.
6EB8 - First audio - audio output.
OA2 - Voltage regulator.
Power Requirements
Filaments: 12 V at 2.5 amp AC or DC. 6 V at 5 amp AC or DC.
B+ Voltage: 275-350 V DC at 85-125 ma.
Total Power: 63.5 watts.
Cabinet Size
6-1/8” high x 12-1/8” wide x 9-15/16” deep.
Net Weight
16 lbs.
Shipping Weight 19 lbs.
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HR-20 Receiver
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HR-20 Receiver
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Manual
with Circuit
Component Values &
Alignment
Details Below
As a Download
Click Here
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The Manual Consists
of the Following
Specifications.
Introduction.
Circuit Description.
Construction Notes.
Parts List.
Step-By-Step Assembly.
Initial Check.
Adjustments.
HF Alignment Chart.
Cabinet Installation.
Mobile Installation.
Noise Suppression.
Noise Troubleshooting Chart .
Operation.
In Case Of Difficulty.
Troubleshooting Chart.
Service Information.
Schematic Circuit.
Layouts
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Manual
with Circuit
Component Values &
Alignment
Details Below
As a Download
Click Here
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Heathkit Receiver HR-20
HR20
Manuals are Available Worldwide as a Download.Full Manual
with Circuit 77 pages
Manual 77 A4 pages worldwide
( For all Payment Options )
( Please Click the Payment Links Below )
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We do all we can to provide
the very best that is available for you.
But in the unlikely event that any data should not be as you expected.
A refund is always available. Kind Regards Allen and Alanna. |
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