DGVPA-77DFAlpha 9500 linear amplifier

RF Concepts Alpha 9500 Linear Amplifier User Manual www.rfconcepts.com Product Release 1 Document Issue 1.1 February 2010 Alpha 9500 Linear Amplifier User ManualRF Concepts Product Release 1 DOCNUMBER 9500 Document Issue 1.1 Page iiFebruary 2010 Alpha 9500 Linear Amplifier User Manual Prepared for RF Concepts by MRH/JH/LJW. To reach technical support or obtain copies of this document, go to www.rfconcepts.com. Copyright © 2010 RF Concepts, LLC. All rights reserved. Specifications subject to change without notice. RF Concepts, LLC Product Release 1 Contents DOCNUMBER 9500 Document Issue 1.1 February 2010Page iii Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 Product Description 1-1 1.2 Product Capabilities 1-2 1.3 Safety Considerations 1-2 1.4 Related Products 1-3 1.5 Assistance 1-3 2. Amplifier Components and Specifications . . . . . . . . . . . . . . . . . . . 2-1 2.1 Cathode (Input-Match) Board 2-2 2.2 Center-Partition Board 2-3 2.3 Controls and Display 2-3 2.4 Display Board 2-4 2.5 Firmware 2-5 2.6 Master-Control Board 2-5 2.7 Output-Tank Circuit 2-5 2.8 Power Connections 2-5 2.9 Power Supply 2-6 2.10 Tube and Tube Deck 2-8 2.11 Specifications 2-8 3. Preparing Your Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.1 Prepare Your Station 3-1 3.2 Limitations of Operation at 90–130 VAC 3-3 4. Setting Up the Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.1 Unpack the Amplifier and Transformer 4-1 4.2 Install the Transformer 4-3 4.3 Connect the Transformer 4-4 4.4 Connect the Cables 4-7 4.5 Set the Input Drive 4-10 4.6 Connect the Transceiver Keying Line 4-10 5. Operating the Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5.1 Principles of Operation 5-1 Basic operation 5-1 Operational states 5-2 Tuning modes 5-4 Faults 5-5 5.2 Start Up the Amplifier 5-5 5.3 Tune the Amplifier 5-7 (Optional) Changing antenna settings 5-7 Autotuning 5-8 Manual tuning 5-9 Alpha 9500 Linear Amplifier User ManualRF Concepts, LLC ContentsProduct Release 1 DOCNUMBER 9500 Document Issue 1.1 Page ivFebruary 2010 5.4 Program the Amplifier Memory 5-10 5.5 Operate the Amplifier 5-12 6. Operating the Amplifier from a PC . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.1 Set Up to Operate from a PC 6-1 6.2 Operate from the PC 6-2 Main window 6-3 Simulated front panel 6-4 Tools menu 6-4 Options menu 6-5 7. Maintaining and Upgrading the Amplifier . . . . . . . . . . . . . . . . . . . . 7-1 7.1 Clean the Chassis 7-1 7.2 Retune the Amplifier 7-2 7.3 Replace the Tube and Fuses 7-2 7.4 Upgrade Firmware 7-3 On the Primary Board 7-4 On the Secondary Boards 7-5 8. Diagnosing Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1 8.1 Overview 8-1 8.2 Fault Codes and Resolutions 8-2 Fault code 1 8-2 Fault code 2 8-4 Fault code 3 8-5 Fault code 4 8-5 Fault code 5 8-6 Fault code 6 8-6 Fault code 7 8-6 Fault code 8 8-6 Fault code 9 8-7 Fault code 10 8-7 Fault code 11 8-8 Fault code 12 8-9 Fault code 13 8-9 Fault code 14 8-9 Fault code 15 8-10 Fault code 16 8-10 Fault code 17 8-10 Fault code 18 8-10 Fault code 19 8-11 Terminology Term-1 Schematics Schem-1 RF Concepts, LLC Product Release 1 List of Procedures DOCNUMBER 9500 Document Issue 1.1 February 2010Page v List of Procedures Procedure 3-1, “Prepare your station,” page 3–1 Procedure 4-1, “Unpack the amplifier and transformer,” page 4–1 Procedure 4-2, “Install the transformer,” page 4–3 Procedure 4-3, “Connect the transformer,” page 4–4 Procedure 4-4, “Connect the cables,” page 4–7 Procedure 4-5, “Connect the transceiver keying line,” page 4–10 Procedure 5-1, “Start up the amplifier,” page 5–5 Procedure 5-2, “(Optional) Change the antenna settings,” page 5–7 Procedure 5-3, “Autotune the amplifier,” page 5–8 Procedure 5-4, “Manually tune the amplifier,” page 5–9 Procedure 5-5, “Program the amplifier memory,” page 5–11 Procedure 5-6, “Operate the amplifier,” page 5–12 Procedure 6-1, “Set up to operate from a PC,” page 6–1 Procedure 7-1, “Clean the amplifier,” page 7–1 Procedure 7-2, “Replace the tube and fuses,” page 7–3 Procedure 7-3, “Upgrade firmware on the primary board,” page 7–4 Procedure 7-4, “Upgrade firmware on the secondary boards,” page 7–7 Alpha 9500 Linear Amplifier User ManualRF Concepts, LLC List of ProceduresProduct Release 1 DOCNUMBER 9500 Document Issue 1.1 Page viFebruary 2010 RF Concepts, LLC Product Release 1 1 DOCNUMBER 9500 Document Issue 1.1 February 2010Page 1–1 1 Introduction 1.1 Product Description 1–1 1.2 Product Capabilities 1–2 1.3 Safety Considerations 1–2 1.4 Related Products 1–3 1.5 Assistance 1–3 Congratulations on your purchase of a professional-quality Alpha 9500 linear amplifier. 1.1 Product Description The Alpha 9500 (see Figure 1-1) is an self-contained autotune HF linear power amplifier. It is capable of continuous operation at 1500 W peak power output on single sideband (SSB), keyed continuous wave (CW), slow-scan television (SSTV), radioteletype (RTTY), digital modes or FM, with no time limit. CAUTION ! CAUTION! Study this manual carefully before operating your amplifier for the first time. In particular, it is extremely important that you thoroughly review the installation and operation sections. Failure to do so could result in serious damage not covered under warranty. Alpha 9500 Linear Amplifier User ManualRF Concepts, LLC IntroductionProduct Release 1 DOCNUMBER 9500 Document Issue 1.1 Page 1–2February 2010 11 1 Figure 1-1 Alpha 9500 1.2 Product Capabilities Product capabilities include: • Continuous RF output. The Alpha 9500 is capable of 1.5 kW continuous RF output on all commonly used modes and on any authorized amateur frequency from 1.8 to 29.7 MHz (other than the 60-meter band). • Compatibility with popular amateur transceivers and exciters. The Alpha 9500 requires approximately 50-65 W peak RF drive for 1.5- kW output. • Capable of full CW break-in, QSK, and all digital m…

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RF Concepts, LLC - 6185 Arapahoe Road - Boulder, CO 80303 - USA PHONE: 303.473.9232 - FAX: 303.473.9660 - WEB: rfconcepts.com April 6, 2010 Attached please find our submission for type acceptance of RF Concepts Alpha 9500 Linear Amplifier RF Concepts, LLC purchased the assets of Alpha Radio Products, LLC in September of 2009. After the acquisition of Alpha Radio Products RF Concepts applied for and received a name change from the FCC for prefix DGV. One of our products wasn’t listed in the FCC database, the above mentioned model. After researching the issue it was determined that this product had been shipping under a class one change for product code DGV-PA77DF. The original application was in paper form from before the FCC had electronic filing and could not be found, therefore we decided to resubmit results of new testing so that this product can be properly listed along with it’s supporting documentation. The attached package consists of the following items 01 - RF Concepts Alpha 9500 FCC Cover revised 2 * 02 - RF Concepts Alpha 9500 Form-731 - revised 2 * 03 - RF Concepts Alpha 9500 User Manual 04 - RF Concepts Alpha 9500 Theory of operation 05 - RF Concepts Alpha 9500 Tuning procedure 06 - RF Concepts Alpha 9500 FCC Label 07 - RF Concepts Alpha 9500 Block Diagram 08 - RF Concepts Alpha 9500 BOM 09 - RF Concepts Alpha 9500 Test Setup 10 - RF Concepts Alpha 9500 Photo Package 11A - ALPHA 9500 HF Power Amplifier Type Acceptance 020112 edited Ver 1 16A * 11B - ALPHA 9500 HF Power Amplifier Type Acceptance 020112 edited Ver 1 16B * 12 - RF Concepts Alpha 9500 Schematic Complete 13 TIA-603C 100318-1546 REPORT * *Denotes new file If you have any questions feel free to contact me regarding this application Steve Farkas President RF Concepts, LLC [email protected]

Alpha9500 Photo Package Page 1 Front of the 9500 Amplifier, Cover Off 2 Power Supply Side of the Amplifier With Transformer Right Side. 3 RF Tank and Tube Side of the Amplifier Left Side 4 High Voltage Power Supply, AC Tap Selection PCB’s Stepper Motor Controllers and 5 Volt Power Supply 5 Fan Controller Five Volt Power Supply Board 6 Tank Circuit Padder Caps High Voltage Filter Board 7 Digital Display Board High Voltage Board 8 AC Input Switch Mains Board Main Controller Board Input Filter Board 9 Front Display Board 10 USB Board 11 Rear View of the Amplifier

Alpha 9500 Label Page 1 Alpha 9500 Label

Alpha9500 Photo Package Page 1 Front of the 9500 Amplifier, Cover Off 2 Power Supply Side of the Amplifier With Transformer Right Side. 3 RF Tank and Tube Side of the Amplifier Left Side 4 High Voltage Power Supply, AC Tap Selection PCB’s Stepper Motor Controllers and 5 Volt Power Supply 5 Fan Controller Five Volt Power Supply Board 6 Tank Circuit Padder Caps High Voltage Filter Board 7 Digital Display Board High Voltage Board 8 AC Input Switch Mains Board Main Controller Board Input Filter Board 9 Front Display Board 10 USB Board 11 Rear View of the Amplifier

Alpha 9500 Theory of operation Page 1 Excerpt from the Alpha 9500 user manual The Alpha 9500 contains the following modules 2.1 Cathode (Input-Match) Board 2.2 Center-Partition Board 2.3 Controls and Display 2.4 Display Board 2.5 Firmware 2.6 Master-Control Board 2.7 Output-Tank Circuit 2.8 Power Connections 2.9 Power Supply 2.10 Tube and Tube Deck The Alpha 9500 uses a single 3CX1500 (8877) high-mu external-anode triode ceramic tube for amplification. The main power supply is an unregulated transformer/rectifier/capacitor power supply for the highvoltage (HV) and heater circuits. All other power supplies are regulated. The biasing and tank circuits are similar in most respects to those of the Alpha 9500’s predecessor, the Alpha 77. The unit has thoroughly modern computer-controlled power supply and control circuitry. Extensive safety measures protect the amplifier against most off-nominal conditions. It has USB and RS-232 interfaces to aid in remote operation. All front-panel features are accessible via these interfaces. There are six main circuit boards in the amplifier. Communications among these is via an I2C bus. Amplifier components are listed alphabetically and described below. 2.1 Cathode (Input-Match) Board The cathode board, housed in the tube deck, consists of a set of Pi filters controlled by a set of five relays that are enabled based on the band-switch setting. 2.2 Center-Partition Board The center-partition board contains the RF decoupling circuit on the B+ line as well as the crowbar safety circuit. When you remove the top cover of the Alpha 9500, the spring metal of this safety device shorts out the B+ line. 2.3 Controls and Display The Alpha 9500 controls enable you to adjust and monitor the amplifier as needed IMPORTANT Note that the front panel has, in the upper-right corner, a 7-segment LED display. The display contains 4 digits. The buttons below the display control what kind of value is displayed: FLT, Fwd, Ig, Ip, SWR, or Vp. Table 2-1 Amplifier Buttons (listed alphabetically) Button Purpose ANTENNA SELECT Determines which one or two of the four antenna output ports to use. BAND Selects an amateur band, designated in megahertz (MHz). DEL Displays the delivered power from the amplifier to the selected antenna port in watts (W). Alpha 9500 Theory of operation Page 2 DIM Controls the brightness of the display LEDs FLT Sets the 7-segment display to show the last fault. Also loads new firmware Fwd Sets the 7-segment display to show forward power in W GAIN Displays the gain in decibels (dB) GRID CURRENT Displays the grid current in milliamperes (mA) Ig Sets the 7-segment display to show grid current in mA Ip Sets the 7-segment display to show plate current in mA LOAD Controls the load capacitor MEMORY Selects one of three sets of segment memories DEF — factory-default settings 1, 2 —User 1 and User 2 memories AUTO — autotune ON (AMP) Turns the amplifier tube and voltage on ON/OFF (ANT SEL) Turns antenna select on; the amplifier tube is not on OPER Sets the amplifier to the operate position PEP Toggles between peak power (PEP) and average power PLATE CURRENT meter Displays the plate current in milliamperes (mA) PLATE VOLTAGE meter Displays the plate voltage in volts (V) RCL (Currently nonfunctional) RF POWER kW meter Displays the forward power in W SAVE Saves the current settings SEGMENT Selects different frequencies within each band SND Controls the sound volume (not yet implemented) STBY Sets the amplifier to standby (bypass) SWR meter Sets the 7-segment display to show SWR TUNE (UP or DOWN) Controls the tune capacitor Vp Sets the 7-segment display to show plate voltage in V 2.4 Display Board The display board is the largest board in the amplifier and spans the entire inside front panel. It has three microcontrollers, one each to control the stepper motors; the LEDs and 7-segment display and push buttons; and the sound controller. 2.5 Firmware The Alpha 9500 firmware controls and implements most amplifier features and functions. You can upgrade the master firmware via a serial or USB connection to a Microsoft Windows PC. 2.6 Master-Control Board The master-control board monitors all critical voltages and currents in the amplifier, as well as the input power and output forward and reflected power. It uses these converted values to control the amplifier’s operation and to send data to the front panel, so that the correct LEDs are lit and the stepper motors move to the correct positions. A standard 9-pin RS-232 serial port is provided for control and monitoring and is found on the back of the Alpha 9500. A USB port is also provided. Either port may be used, but only one may be active at any one time. The amplifier automatically senses when a PC is attached to the USB port, and uses that port. If nothing is connected to the USB, the amplifier automatically switches back to the RS-232 serial port. Alpha 9500 Theory of operation Page 3 2.7 Output-Tank Circuit The output-tank circuit provides reliable high-efficiency, low-distortion performance in a very compact volume. The basic topology is “pi-L”, which provides harmonic attenuation adequate to meet the requirements of all countries globally that permit power outputs of 1500 W. Band switching is under automatic control, accomplished by a 4-wafer band switch. These wafers are used as multifunction tap selectors, which simultaneously select band taps on the inductors and include varying amounts of capacitance to provide band spread on the tune and load capacitors. The wafers are in the RF tank area. The band-switch position is controlled by a stepper motor in the front subchassis. 2.8 Power Connections When the Alpha 9500 is powered up, it measures the line voltage and chooses, then sets the appropriate tap setting for the transformer primary. After it is powered up, it does not reset the tap. The amplifier can be set to override autotaps election and use any primary tap; it may be useful to do so if your line voltage is unst…

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RF Concepts Alpha 9500 Tuning procedure Page 1 Excerpt from the Alpha 9500 user manual RF Concepts Alpha 9500 Tuning procedure Table 5-2 Tuning modes You can tune the amplifier in one of three tuning modes—Default, User 1, or User 2—and from any of these proceed to autotune mode.. Mode Description Default By default, when the amplifier is first powered on or QSYed, it retunes using factory supplied tuning values. These values are derived for a load with voltage standing wave ratio SWR = 1.0:1, so the amplifier will be tuned with a different tuning value from default memory for each segment of each band. For SWR ≤ 1.5:1, the default tuning values are usually appropriate. For SWR > 1.5:1, some manual tuning may be required using the tune and load controls. The antenna port last used in Default mode for a particular band and band segment is used. User 1/User 2 In User 1 or User 2 mode, the amplifier tunes (auto selects) from values stored in User 1 or User 2 memory. As in Default mode, the amplifier retunes at power up or when it is QSYed to a different band segment. Initially (from factory), the user memories are programmed with factory-default values, which are retained until they are overwritten by new tuning values saved to a band segment. The antenna port is the last one used for that user memory on that band and segment. If for some reason the amplifier is not correctly tuned, you can tune it manually using tune and load controls, and the new value is then stored in user memory. When you switch among Default and User 1/User 2 modes, the amplifier tunes to the values stored in the newly selected memory. Programming a user memory overwrites any previous values, and default values are lost from user memory for a specific band segment. You can view the default values through the computer connection to the amplifier. If you have two antennas that operate on the same band, store separate values in User 1 and User 2 memories. The antenna port selection is determined by the last used antenna on that band segment. Auto In autotune mode, which you select when the amplifier is in User 1 or User 2 mode, the amplifier initially tunes from stored values and then automatically tweaks the tuning when power is applied. The amplifier tunes on the fly and hunts for an optimum tuning point as you change frequency. However, depending on load conditions, you may need to turn off autotune mode and tweak the tuning yourself with the load and tune controls. The currently selected antenna port is used. Be sure to save the results of autotuning into the user memory by pressing the SAVE button. When you switch out of autotune mode, the amplifier holds the tuning unless you press Default or User 1/User 2, in which case it returns to the memory values for those modes. Note that autotuning the amplifier is different from autoselecting a band and band segment. In normal operation, when the amplifier is keyed, it autoselects the correct band and segment without your intervention, although you can overrule it by manually selecting a band segment. Autotuning, on the other hand, is initiated only when you press the Auto button to put the amplifier in autotune mode. Faults In the event of a fault, the tube biases off, the relays are placed in bypass mode, and RF from the amplifier goes directly to the antenna. The FLT (Fault) switch lights and the 7-segment display shows the number of the last recorded fault. IMPORTANT Do not turn the amplifier off. To clear a fault:  For a gain fault, wait for the amplifier to reset itself.  For all other faults, resolve the fault as described in Section 8.2, ―Fault Codes and Resolutions.‖ Then press the left ON button to release the fault and press the OPER button to continue RF Concepts Alpha 9500 Tuning procedure Page 2 5.2 Start Up the Amplifier Procedure 5-1 Start up the amplifier Step 1 Install and set up the amplifier as described in the preceding chapters. Step 2 Power up the amplifier by pressing one of the two ON buttons: ON/OFF (ANT SEL) button This provides initial power to the metering, band, and segment selection circuits, which turns on the wattmeter and antenna-selection functionality (ON1 setting). When you then pass RF through and key the amplifier, the amplifier autoselects a band and segment. You can pass up to 1500 W through the amplifier in bypass or the ON1 setting. ON (AMP) button This duplicates the functions described above, and also applies high voltage to the tube. The amplifier begins its warm-up countdown sequence and the 7-segment display shows the seconds remaining in the countdown. The STBY switch light blinks. Step 3 Monitor amplifier parameters: Display amplifier parameters by pressing the associated button that controls the 7-segment display. For information on these buttons, see Section 2.3, “Controls and Display,” page 2–3. Display the plate voltage by pressing the Vp button. The value should be about 3545 V. If the value is....  <3300 V: Check your outlet, plug wiring, and equipment grounding in your shack. If power is variable or unstable, you can force the amplifier to always choose a particular tap setting. For information on how to do so, contact RF Concepts technical support.  >3800 V: Ensure that the correct primary tap is being selected. If autotap-selection is disabled, try enabling it. If the highest tap is being used, your line voltage is likely >250V; talk to your power company about reducing it. To return to the countdown display, press the FLT (Fault) button. Step 4 Proceed to Section 5.3, “Tune the Amplifier,” page 5–7. NOTE During warm-up and operation, do not press the MEMORY/AUTO button. The amplifier performs automatic frequency detection, bandtuning, and antenna selection independently of this button. Rather, use this button to assist with initial tune and load settings as described in Section 5.3, ―Tune the Amplifier,‖ page 5–7. 5.3 Tune the Amplifier IMPORTANT •  Do not attempt to tune the amplifier until you read this ent…

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VP of Engineering Gordon Hardman Test Engineer Mike Higgins Preliminary Ver. 1.16A ALPHA 9500 HF Power Amplifier Test Report for Grant of Certification for Use in Part 97 Amateur Service under the Rules of the Federal Communications Commission DGVPA-77DF February 23, 2010 Submitted by: RF Concepts, LLC. 6185 Arapahoe Road Boulder, CO 80303 Voice: 303.473.9232 2 Table of Contents 1.0 INTRODUCTION ................................................................................................................................. 3 2.0 DESCRIPTION OF AMPLIFIER ...................................................................................................... 3 2.1 GENERAL FEATURES ............................................................................................................. 3 2.2 DESIGN FEATURES ................................................................................................................. 3 2.3 DC OPERATING CONDITIONS .............................................................................................. 4 2.4 SPECIAL DESIGN CONSIDERATIONS ................................................................................. 4 2.4.1 Minimal Gain at 27 MHz .................................................................................................... 5 2.4.2 In-band Gain ....................................................................................................................... 5 2.4.3 Spurious Emissions ............................................................................................................. 5 2.4.4 Anti-tampering Features ..................................................................................................... 5 3.0 TEST RESULTS ................................................................................................................................... 6 3.1 IN-BAND GAIN ........................................................................................................................ 7 3.1.1 Test Procedure ........................................................................................................................ 7 3.1.2 Results ..................................................................................................................................... 7 3.1.3 Conclusion .............................................................................................................................. 8 3.2 OUT-OF-BAND GAIN ............................................................................................................. 8 3.2.1 Test Procedure ........................................................................................................................ 9 4.0 OTHER COMPLIANCE INFORMATION ..................................................................................... 10 4.1 FCC ID ..................................................................................................................................... 10 4.2 FCC Exposure information......…

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