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DOCNUMBER 8410

Document Issue 1.1
August 2015

Page 2–3

RKR Designs LLC

Alpha 8410 Linear Amplifier User Manual
Amplifier Components and Specifications

Figure 2-3  

Amplifier interior (components may differ from those in 

your amplifier, depending on its vintage)

2.1  Boards

The following amplifier boards are described below in alphabetical order:

•

Center-partition board

•

Control board

•

Display board

•

HV board

•

Mains board

•

Transmit/receive (T/R) board

•

Tube-deck board

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 amplifier, the spring metal of this safety device shorts out the B+ 
line.

Содержание Alpha 8410

Страница 1: ...Alpha 8410 Linear Amplifier User Manual RKR Designs LLC Document Issue 1 1 August 2015...

Страница 2: ...gust 2015 Alpha 8410 Linear Amplifier User Manual RKR Designs LLC 632 S Sunset St Longmont CO 80501 303 473 9232 To reach technical support or obtain copies of this document go to www rksdesignsllc co...

Страница 3: ...dard Voltage 3 4 4 Setting Up the Amplifier 4 1 4 1 Unpack the Amplifier and Transformer 4 1 4 2 Connect the Transformer 4 2 4 3 Check the Tubes and Exhaust Chimney 4 3 4 4 Connect the Voltage Tap 4 3...

Страница 4: ...Alpha 8410 Linear Amplifier User Manual RKR Designs LLC Contents Product Release 1 DOCNUMBER 8410 Document Issue 1 1 Page iv August 2015...

Страница 5: ...chimney page 4 3 Procedure 4 4 Connect the voltage tap page 4 4 Procedure 4 5 Connect the cables page 4 4 Procedure 4 6 Connect the transceiver keying line page 4 7 Procedure 5 1 Start up the amplifie...

Страница 6: ...Alpha 8410 Linear Amplifier User Manual RKR Designs LLC List of Procedures DOCNUMBER 8410 Document Issue 1 1 Page vi August 2015...

Страница 7: ...ble 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 CAUT...

Страница 8: ...ble of full CW break in QSK and all digital modes when used with any appropriate transceiver Built in protective functions The control system incorporates protective functions that minimize the probab...

Страница 9: ...ly in place and all attachment screws inserted NEVER turn on the amplifier without a good ground connection on the rear panel ground terminal NEVER turn the amplifier back on after a hard fault that i...

Страница 10: ...is available from several sources Go to our website at www rksdesignsllc com and click Support On this site you can get the following assistance Alpha Forum FAQs Legacy equipment information Manuals...

Страница 11: ...supplies are regulated The control circuit uses a microprocessor in the loop to monitor and control amplifier operation There are seven circuit boards in the amplifier Center partition board Control...

Страница 12: ...ifications DOCNUMBER 8410 Document Issue 1 1 Page 2 2 August 2015 22 2 The amplifier front back and interior are shown below see Figure 2 1 Figure 2 2 and Figure 2 3 Amplifier components are listed al...

Страница 13: ...vintage 2 1 Boards The following amplifier boards are described below in alphabetical order Center partition board Control board Display board HV board Mains board Transmit receive T R board Tube dec...

Страница 14: ...serial peripheral interface SPI It contains a regulator to drop voltage from 12 V to 5 V for the display HV Board The main high voltage for the amplifier is created on the HV board using a full wave...

Страница 15: ...tant voltages for the amplifier are brought to test points on this board The primary voltage taps are located on the top of the mains board between the transformer and the front panel There is a row o...

Страница 16: ...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...

Страница 17: ...bsorbs most of the input drive power The RF voltage across this resistor is added to the grid 1 DC bias to provide the net low impedance tube grid 1 bias The RF impedance represented by grid 1 and its...

Страница 18: ...C voltage 100 120 200 220 240 selectable AC current 15 amps 240 VAC 1500 W Input impedance 50 ohms Output impedance 50 ohms RF connectors SO 239 Cooling Forced air Size 17 3 W x 7 H x 21 0 D including...

Страница 19: ...C circuit If you do not have a 240 VAC outlet in your station have a licensed electrical contractor install one A minimum of a 20 A capacity is required A 20 A breaker on your 240 V circuit is suffici...

Страница 20: ...d the use of compressed air for dust removal Step 3 Ready your antenna for 1500 W Ensure that all antennas are rated for 1500 W and that they are carefully tuned and installed for minimum voltage SWR...

Страница 21: ...moisture penetrate under the jacket NOTE The FCC requires users to check their installations for compliance with published values for allowable exposure to RF fields This information is available in...

Страница 22: ...W PEP operation CW or SSB may be possible if your AC line service has sufficient current capacity 30 A circuit recommended However 1500 W continuous should not be expected High 250 V Tube lifetimes ma...

Страница 23: ...wly throughout these procedures to avoid bumping and damaging adjacent wires connectors and components 4 1 Unpack the Amplifier and Transformer Procedure 4 1 Unpack the amplifier and transformer Step...

Страница 24: ...er on a tilt so far that the transformer is cantilevered or hangs out to any degree can cause the chassis to distort Step 3 Pick the transformer up by the handle and move it onto the lip at the edge o...

Страница 25: ...e connector is tightly clamped to the tube Step 3 Ensure that the silicon rubber exhaust chimney is straight and that the bottom is firmly against the tube deck and completely covers the airflow openi...

Страница 26: ...nominal primary voltages 100 120 200 220 and 240 V cover all the line voltages normally encountered around the world The nominal midrange voltage for each tap is printed on the mains board circuit bo...

Страница 27: ...e necessary with a 240 V circuit configured 120V N 120V without a separate ground commonly found in the US 1b Connect the black and white power cord wires to the two hot wires of the AC source Either...

Страница 28: ...able connector 6b Ensure that the T R relay contact closes Protection circuitry prevents hot switching when RF drive is applied Modern transceivers have the proper time delay between key up and the st...

Страница 29: ...processing adjust the MIC or MIKE controls For more information see the manual for your particular transceiver 4 7 Connect the Transceiver Keying Line Procedure 4 6 Connect the transceiver keying line...

Страница 30: ...Alpha 8410 Linear Amplifier User Manual RKR Designs LLC Setting Up the Amplifier DOCNUMBER 8410 Document Issue 1 1 Page 4 8 August 2015 44 4...

Страница 31: ...F To enter this state Plug the amplifier into the AC line supply In this state The front panel is dark The internal auxiliary 5 V power supply is on The microprocessor is powered up and communicates v...

Страница 32: ...ter can use the antenna but the amplifier does not amplify the signal Certain faults cause the amplifier to return to this mode Operational but unkeyed Key in has not been asserted To enter this state...

Страница 33: ...twice per second indicating that warmup is still in progress The FAULT OPER and STBY LEDs remain unlit Step 6 Ensure that exhaust air is detectable from the exit vent holes above the tubes If exhaust...

Страница 34: ...t bit of SWR in fact you lose power this way The Alpha 8410 senses the beginning of any RF arc in for example a TUNE or LOAD variable capacitor and automatically switches the amplifier to standby with...

Страница 35: ...lifier s specific tuneup table Step 6 Key the amplifier with 20 W drive and adjust the TUNE control for a peak in RF out that should be at the same point as a dip in Ip Step 7 Increase the drive to ge...

Страница 36: ...e TUNE control to deflect the GAIN LED maximum rightward 7b Adjust the LOAD control to place the illuminated GAIN LED between the white lines above and below the LED bargraph Repeat this step at least...

Страница 37: ...The amplifier operates in Class AB1 when delivering maximum output power consistent with excellent linearity A small amount of grid current flows which you can monitor as follows The GRID MIN LED ligh...

Страница 38: ...AC power from the amplifier then determine and correct the cause of the trip before turning the amplifier back on This hard fault trip circuit does not rely on the microcontroller for its operation a...

Страница 39: ...k switch that removes primary power from the amplifier and a crowbar that short circuits high voltage to the chassis when the cover is lifted These interlocks protect against electric shock resulting...

Страница 40: ...extremely dusty secure a thin air filter of the type used for window air conditioners across the air intake on the rear panel Step 6 Replace the cover and reconnect the AC line cord to the power sour...

Страница 41: ...crowbar is closed the step start fuse normally blows Step 5 Replace the cover and reconnect the AC line cord to the power source 6 3 Retune the Amplifier Normally you need to retune the amplifier only...

Страница 42: ...Alpha 8410 Linear Amplifier User Manual RKR Designs LLC Maintaining the Amplifier DOCNUMBER 8410 Document Issue 1 1 Page 6 4 August 2015 66 6...

Страница 43: ...ier attempts to return to OPERATE mode You can shorten this 4 s period by toggling the OPER STBY switch While the FAULT LED is flashing the Ip and HV LEDs indicate which fault type caused the amplifie...

Страница 44: ...ed 1 5 A If the current exceeds 2 5 A AC select relays are de energized and the amplifier shuts off completely Resolution 1 Retune the amplifier 2 Ensure that the amplifier is not overdriven 3 Fix any...

Страница 45: ...to below the threshold at the end of 500 ms Fault 4 results When power exceeds 100 W the absolute maximum value at which the amplifier can operate an immediate Fault 4 results Resolution Decrease the...

Страница 46: ...n Ensure that the cover is in place and all screws are securely inserted 3 One or more connectors may be loose Check that all of the transformer connectors are securely attached that the 3x3 molex con...

Страница 47: ...is connected to the correct port on the transceiver and that amplifier keying is enabled 3 If the tube current has exceeded 2 5 A follow the resolution instructions for Fault type 2 page 7 2 and Fault...

Страница 48: ...ive and or amplifier loading may be insufficient Decrease drive from the transceiver Recheck the amplifier tuning 2 The coaxial connector coax feed line antenna feed point balun tuner or antenna trap...

Страница 49: ...with time ALC Automatic Level Control Technology that automatically controls output power ampere Unit of electric current ARRL American Radio Relay League US national organization of amateur radio ope...

Страница 50: ...equency shift keying Type of frequency modulation in which information is conveyed by shifts in the output frequency between predetermined values H HF High frequency Radio frequency within the range 3...

Страница 51: ...ts P PSK Phase shift keying Digital modulation scheme in which information is conveyed by changes or modulations in the phase of a reference signal Q QSK Quadrature shift keying Digital modulation sch...

Страница 52: ...command SWR Standing wave ratio Ratio of the amplitude of a partial standing wave at an antinode maximum to the amplitude at an adjacent node minimum Measure of antenna and feedline efficiency T T R T...

Страница 53: ...DOCNUMBER 8410 Document Issue 1 1 August 2015 Page Schem 1 Schematics Schematics NOTE The following pages contain detailed schematics for the Alpha 8410 linear amplifier...

Страница 54: ...Alpha 8410 Linear Amplifier User Manual RKR Designs LLC Page Schematics DOCNUMBER 8410 Document Issue 1 1 Page Schem 2 August 2015...

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