HobbyPCB HARDROCK-50 Assembly Instructions Manual
0.5w to 5w driver amplifier
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Summary of Contents for HobbyPCB HARDROCK-50
- Page 1 HARDROCK-50 50 0.5W to 5W Driver Amplifier 0.5W to 5W Driver Amplifier Assembly Instructions Assembly Instructions – Rev C. Jim Veatch WA2EUJ 5 December 2017...
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Page 2: Table Of Contents
TABLE OF CONTENTS INTRODUCTION ..............................1 SPECIFICATIONS ..............................2 ASSEMBLY OVERVIEW ............................3 DRIVER INVENTORY ............................4 DRIVER PCB .................................5 INTEGRATION ..............................9 SCHEMATIC DIAGRAM ............................. 12... -
Page 3: Introduction
Construction and installation of the driver amplifier assumes that we are starting with a fully functioning and tested Hardrock-50 amplifier. If your amplifier does not work please troubleshoot it first, adding the driver amp is not likely to clear up any issues and is likely to complicate the troubleshooting procedure. -
Page 4: Specifications
2. SPECIFICATIONS ITEM SPECIFICATION Frequency Range 1 – 100 MHz Input Power 0.5W maximum DC Power 11-16 Volts, < 1.5 Amps Spec’d @ 13.8V Amplifier Type Class A Bias Current 400-450 mA Size Does not affect the overall HR50 size. Weight Adds about 6 oz. -
Page 5: Assembly Overview
3. ASSEMBLY OVERVIEW Assembling the driver amplifier kit should be an enjoyable and rewarding experience. If at any time you feel frustrated or are having difficulty, take a break, ask questions on the forum or email, and remember that if you are having a problem with something there’s a good chance that someone else has had the same issue. -
Page 6: Driver Inventory
4. DRIVER INVENTORY PART ID PART NUM PART NUM DESCRIPTION PICTURE PICTURE QUANTIT DRV_IN, DRV_OUT 3.5MM TERMINAL 1009-0001 0001 BLOCK 2 POS Q201 1005-0001 0001 RD16HHF1 PCB MOUNTING ¼” NICKEL PLATED 1002-0004 0004 BRASS STAND-OFF 6.35 PCB MOUNTING 1000-0006 0006 #4-40 ¼”... -
Page 7: Driver Pcb
5. DRIVER PCB This section covers the assembly of the Driver PCB. Required tools and supplies are; soldering iron, diagonal cutters, tweezers and long-nose pliers. Carefully inspect the Driver PCB looking for poor soldering on the SMT components. The photos show a 2017 version of the board in which the DRV_IN and DRV_OUT labels are reversed. Your board will have the labels corrected □... - Page 8 □ Step 2: Cut the red, yellow and black leads of the power cable to 6” length, strip approximately ½” of insulation from the end opposite the connector and tin the exposed wire. Be careful not to add too much solder while tinning it may be difficult to insert the wire into the PCB in the next step.
- Page 9 □ Step 4: Remove the lower two screws in the front and rear panel of the Hardrock-50 amplifier and remove the bottom cover of the amplifier. □ Step 5: Grip the leads of the MOSFET with pliers and bend the pins of the MOSFET forward as shown.
- Page 10 □ Step 7 □ Step 8: Make any necessary mechanical adjustments then solder the leads of the MOSFET and trim of any excess leads. The Driver is now ready for integration.
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Page 11: Integration
GND. □ Step 3: On the amp board in the Hardrock-50, remove the coax jumper from the AMP_IN terminal block. Pro-Tip: when loosening the screws in the terminal block, keep turning the screw counter- clockwise until you hear a ‘click’. This will make it easier to insert the wire. Attach the coax coming from the amp board to the DRV_IN terminal block on the driver board and the DRV_OUT jumper, from Step 2, into the AMP_IN terminal block on the amp board. - Page 12 □ Step 5: Place a 50 ohm load on the output connector of the Hardrock-50, connect a 13.8V to the amp, turn the amp on, set the band to 30M and the mode to PTT. Set the DVM to its lowest DC voltage scale, the millivolt range if it has one.
- Page 13 □ Step 6: Ground the center of the Hardrock-50’s PTT jack, placing the amp into the TX mode. Slowly turn VR201 on the driver board until the voltage on the meter reads 0.045V (45 millivolts), within 0.005V (5 millivolts). Then remove the ground from the PTT jack, turn off the amp, disconnect the power and the load.
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Page 14: Schematic Diagram
7. SCHEMATIC DIAGRAM...
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