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Heathkit GD-48, Instruction Manual

The Heathkit GD-48 is a versatile and user-friendly device that brings innovation to your home. With its comprehensive Instruction Manual, easily accessible for free download on 88.208.23.73:8080, users can effortlessly set up and navigate the device, ensuring a hassle-free and enjoyable experience.

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HOM rev. new

Heathkit of the Month #53 - GD-48 Metal Locator

Copyright 2014, R. Eckweiler & OCARC, Inc.

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Summary of Contents for GD-48

Page 1: ...ins In ads it was called the Coin Track Around 1979 the last of the Metal Loca tors the deluxe GD 1290 GroundTrack was released Table 1 gives the production dates as best I can determine with the catalogs in my files The Heathkit GD 48 Metal Locator The first Heath kit metal locator the GD 48 origi nally cost 59 95 By 1976 the price had increased to 69 95 but in the fall of that year it was offere...

Page 2: ...e jack and SENSITIVITY potentiometer which contains the OFF on switch The red battery lead is also connected to the switch The shaft and swivel are then assembled and the shaft is attached to the control panel and handle after the spiral cable is snaked through the shaft Next the coil housing top is con nected to the shaft the spiral cable is then sealed with a tube of supplied sealant where it en...

Page 3: ...with no input signal Q4 is just cut off When a signal becomes present Q4 conducts and and amplifies the changes in the input signal Transistors Q4 and Q5 share the same metal heatsink this is not for heat dissipation but to keep the two tran sistors at the same temperature and reduce drift in the differential amplifier The output of Q5 is further amplified by Q6 which is a basic common emitter amp...

Page 4: ...four transistors and handles the relaxation oscillator and active filter amplifier and one in the control handle that uses six transistors and processes the audio The audio processing board contains a fixed high gain amplifier followed by a temperature com pensated variable gain amplifier that is set by the S E N S I T I V I T Y control This am plifier drives a single transistor that drives the sp...

Page 5: ...were available for the GD 1190 The GDA 1190 1 nicad battery pack the new GDA 1190 2 Superex headphones and the GDA 110 3 carrying case In the Fall 1980 catalog these sold for 19 95 11 95 and 11 95 respectively The accessory nicad battery pack can be charged either from a car cigarette lighter socket or from a standard 120V AC outlet The Heathkit GD 1290 GroundTrack In 1979 shortly after the GD 119...

Page 6: ... I asked Ken what happened to his metal locator he said the swivel broke between the sense head and the arm and he finally abandoned it How ever he said it gave him good service for many years Acknowledgements I d like to thank Ken W6HHC for sav ing and passing along his GD 48 man ual after his unit broke beyond repair He also provided the GD 348 manual that he acquired from a friend 73 from AF6C ...

Page 7: ...HOM rev new Heathkit of the Month 53 GD 48 Metal Locator Copyright 2014 R Eckweiler OCARC Inc Page 7 of 7 ...

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