galaxy_mosfet_update_3600xx.pdf

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How to update the Galaxy Radios

for using IRF520 MOSFET’s.

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Draft Ver 2.0

SECTION 1

1.0 INTRODUCTION:

1.1 TOOLS NEEDED:

1.2 BEFORE YOU START NOTES:

2.0 MODELS COVERED:

3.0 WHERE TO GET THE PARTS NEEDED:

4.0 PARTS LIST:

SECTION 2

4.0 OVERVIEW OF STEPS FOR A SINGLE FINAL MODELS:

5.0 OVERVIEW OF STEPS FOR A DUAL FINAL MODEL:

SECTION 3

6.0 SINGLE FINAL CHASSIS PICTURES BEFORE CONVERSION COMPONENT SIDE VIEW:

6.1 SINGLE FINAL CHASSIS SCHEMATIC AND PCB LAYOUT BEFORE CONVERSION:

6.2 SINGLE FINAL CHASSIS SCHEMATIC AND PCB LAYOUT SCHEMATIC AFTER CONVERSION:

SECTION 4

7.0 DUAL FINAL CHASSIS PICTURES BEFORE CONVERSION COMPONENT SIDE VIEW:

7.1 DUAL FINAL CHASSIS PICTURES BEFORE CONVERSION COPPER SIDE VIEW:

7.2 DUAL FINAL CHASSIS SCHEMATIC AND PCB LAYOUT BEFORE CONVERSION:

7.3 DUAL FINAL CHASSIS SCHEMATIC AND PCB LAYOUT SCHEMATIC AFTER CONVERSION:

7.4 DUAL FINAL MOSFET PICTURES AFTER CONVERSION:

SECTION 5

8.0 ADJUSTMENT:

SECTION 6

9.0 TRANSISTOR DATASHEET:

9.1 FINAL NOTES:

NOTE: There may be more information in this package than you need depending on your

experience. When you click the print icon you can select print all the pages, range of pages or

any current page you have displayed.

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Galaxy DX Radios for using IRF520 MOSFET’s

SECTION 1

1.0 INTRODUCTION:

Soon all Mitsubishi 2SC1969, 2SC2166 and 2SC2312 transistors will disappear or become too expensive to

buy. This is how to correctly update the Galaxy Radios for using IRF520 MOSFET’s.

This project is not for novices or anyone who does not have the proper equipment for aligning RF circuitry, or

anyone faint at heart.

Leave the installation and alignment to a proven technician.

NOTE:

Update sheet is written on the assumption that you know the basics.

Exercise a great deal of care with this mod!

Due to the placement, size, and close proximity of the surrounding traces.

If done wrong you could destroy the PCB.

If you have even the slightest doubts or the proper equipment, it would be wise to have someone else you trust

perform the mod for you.

SO TAKE YOUR TIME AND DOUBLE CHECK YOUR WORK!!!!

1.1 TOOLS NEEDED

You will need a Soldering Iron, and solder.

Long nose pliers.

Cutting pliers (What you are looking for are "flush cutting" pliers rather than the traditional

"dikes" or "diagonal cutting pliers.)

Digital Multimeter.

Magnifier for examining circuit board traces and solder connections.

Preferably some experience soldering and de-soldering components.

1.2 BEFORE YOU START NOTES:

If you properly replace the 2SC2166 driver and 2SC1969 final or both finals in SSB chassis with three IRF520

mosfets, you will gain slightly more power when done correctly. The radio will also have less than 10%

distortion at full-modulated power. Pushing the mosfets harder will naturally give higher wattage but this comes

with problems like harmonics, distortion and high temp plus they will become very unstable.

So be weary of those that post numbers of 50 watts per mosfet when in reality the safe numbers are closer to

20-25 watts each. Mosfets are not as forgiving as bipolar’s so failure rates for mosfet radios will be very high

when tweakers and peakers start casting their magic spells on them.

One other thing to be weary of are the folks out there that’s going to jump on the kit bandwagon. Ask questions

about their kit of components.

For Example:

1. Does the kit come with all of the components needed?

2. If doing a single to dual final update. Does the kit come with the Heatsink, and transistor mounting hardware?

3. Do they offer any support if you have problems?

Be REAL careful with the bunch on ebay.

Preparing the Radio for the Mod.

1. Fully check out the radio and be sure everything works before starting this mod!

2. Carefully remove the top and bottom radio covers. When removing the bottom cover, disconnect the speaker

connector from the main board.

3. Put the Radio back to stock i.e.

a. If AMC has been defeated, return AMC back to operation.

b. Remove any of the so-called swing Mods.

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Galaxy DX Radios for using IRF520 MOSFET’s

SECTION 1

2.0 MODELS COVERED:

Radios with the following Main Chassis (Single and Dual final)

EPT360011B, EPT360012B, EPT360014B, EPT360014C.

DX33HML, DX44V, DX55V, DX66V, DX73V, DX77HML, DX88HL, DX99V, Galaxy Plus, DX11B

3.0 WHERE TO GET THE PARTS NEEDED:

All Galaxy DX Radio parts and IRF520’s,

purchased directly from the following distributors

All Galaxy DX Radio parts and IRF520’s

Wholesale Only Distributors

J T I Distributors

PO Box 300

Welcome NC 27374-0300

Toll Free: 1-800-626-3059 strictly orders only!

Local: 336-731-8177

Fax: 336-731-2805

Web Site: http://www.jtronix.com/

RF PARTS CO.

435 S. Pacific St.

San Marcos CA 92069

TEL: (800) 737-2787 strictly orders only!

(760) 744-0700 all other questions

FAX: (760) 744-1943

Web Site: http://www.rfparts.com/

Mouser has the IRF520’s also

MOUSER ELECTRONICS

1000 N. Main St.

Mansfield TX 76063

TEL: (800) 346-6873, (817) 483-4422

(800) 992-9943 to get a catalog only

FAX: (817) 483-0931

Web Site: http://www.mouser.com/

MAYCOM COMMUNICATIONS PRODUCTS

1134 W. JOHN BEERS ROAD

STEVENSVILLE (DERBY), MICHIGAN 49127

1-269-429-8522

1-269-429-8541

Fax: 1-269-429-2137

Web Site: http://maycomcomm.com/

NOTE: The IRF520’s are not expensive do your research and check prices.

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Galaxy DX Radios for using IRF520 MOSFET’s

SECTION 1

4.0 PARTS LIST:

Single Final Models

IRF520 MOSFET

TR43, TR44, TR56

1N4148

D88, D89, D112

220K 1/4 Watt

L47-R218

1K 1/4 Watt

L50-R271, L35-R216

680pF /UL

C175

820pF /SL

C171, C209

100KB (Galaxy Part # RE10400020)

VR10, VR11, VR20

470K 1/4 Watt

D90

82K 1/4 Watt

R219

100K 1/4 Watt

R215, R270

47K 1 Watt

R217, R272

390pF /UJ

C167

150pF /CH

Solder side of TR44 S-D

Wire for jumpers

J77, J98

Heatsink (Galaxy Part # MM7878041B)

SCREW M2x0.4Px12 (Galaxy Part # JS052012MN)

TR56

Insulating Ring (Galaxy Part # XZZZ90003Z)

TR56

Insulating Plate 10x14x1.55mm (Galaxy Part # XZZZ90358Z)

TR56

Dual Final Models

IRF520 MOSFET

TR43, TR44, TR56

1N4148

D88, D89, D112

220K 1/4 Watt

L47-R218

1K 1/4 Watt

L50-R271, L35-R216

680pF /UL

C175

820pF /SL

C171, C209

100KB (Galaxy Part # RE10400020)

VR10, VR11, VR20

470K 1/4 Watt

D90

82K 1/4 Watt

R219

100K 1/4 Watt

R215, R270

47K 1 Watt

R217, R272

390pF /UJ

C167

150pF /CH

Solder side of TR44 S-D

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