Heathkit Mobile Receiver HR-20 HR20


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Component Values &
Alignment Details Below
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See also : - 

Heathkit Mains Power Supply HP-20 Click Here

Heathkit Mobile Transmitter HX-20 Click Here

HR20 HX20 HP20 Front View.jpg (25292 bytes)


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.

HR20 Front View.jpg (22342 bytes)

HR-20 Receiver

Manual with Circuit
Component Values &
Alignment Details Below
As a Download

Click Here


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.

HR20 Top View.jpg (23910 bytes)

HR-20 Receiver

HR20 Bottom View.jpg (28914 bytes)

HR-20 Receiver

Manual with Circuit
Component Values &
Alignment Details Below
As a Download

Click Here


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
 

Cables.jpg (32154 bytes)

Manual with Circuit
Component Values &
Alignment Details Below
As a Download

Click Here


Heathkit Receiver HR-20 HR20
Manuals are Available Worldwide as a Download.

Full Manual with Circuit 77 pages
Manual 77 A4 pages worldwide

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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.


Manuals are Available Worldwide as a Download

Thank you for your interest. Allen and Alanna G0RIT
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Revised: February 09, 2021