Ehrhorn Technological Operations ALPHA 86 Operating And Technical Manual Download Page 29 | Manualshive

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PIN  FUNCTIONS
ft,  ORDER  AS
V IE W E D   FROM  TOP
OF  BOARD

WIRE COLORS AS MARKED

D1-D4

1N5401

D5&D6

1N4004

FIGURE 8

Low

V

oltage

P

ower

S

upply

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Summary of Contents for ALPHA 86

Page 1: ...OPERATING TECHNICAL MANUAL ALPHA 86 HELINEAR POWER AMPLIFIER EHRHORN TECHNOLOGICAL OPERATIONS INC 4975 NORTH 30TH STREET COLORADO SPRINGS CO 80919 COPYRIGHT 1990 BY E T O INC...

Page 2: ...ges which do not affect overall circuit design specifications capabilities or operat ing procedures typically are made on a continuing basis over the life of the product Thus mostALPHA 86 s will vary...

Page 3: ...ransformer Installation Pictorial 5 SECTION 3 Transceiver Connection 6 Transceiver Connection Pictorial 7 SECTION 4 Operation 8 Control Functions 8 Switches 8 Metering 8 Tune Up Procedure 8 High and L...

Page 4: ...tached to the tube plate caps If the connectors are not attached the tubes may be irreparably damaged immediately upon application of RF drive to the amplifier The red silicone rubber chimneys install...

Page 5: ...modes including continuous carrier CCS 1 2 3 Drive Power 50 to 70 watts nominal for rated output 1 2 4 Power Gain approximately 15 dB equivalent to a power increase of thirty times 1 2 5 Input Impedan...

Page 6: ...chassis wall It must slide underneath these two RCA jacks and not pinch the chassis wiring Four tapped bolt holes are provided in the transformer base plate Mount ing hardware is supplied with the po...

Page 7: ...h no other loads connected to it may limit amplifier power output to around 1000 watts 2 5 Replacing Cover Tilt the top cover down slightly at the front to allow its front edge to slide underneath the...

Page 8: ...FIGURE 1 T ransformer Installation 2 r L nil 4 V IR E S OMITTED FOR C LA R IT Y 6 RED ORANGE BLACK 5...

Page 9: ...will be necessary For specific instructions contact the ETO customer service department Figure 2 should be used with late model transceivers such as those listed below and will allow the full capabili...

Page 10: ...ion TD ANT KEY AUX o RF IN ALC RELAY PTT TRANSCEIVER ALC RF OUT RELAY PHDND PATCH o RG 58C U o PHDND PATCH CDRD FIGURE 3 A lternative Method f o r Switching Between Conventional SSB PTT o r VDX and CV...

Page 11: ...tenna HI LO LO selects reduced plate voltage for tuning or low power operation to about 1000 watts output HI selects high plate voltage for full power operation 43 Metering Separate LED bargraphs prov...

Page 12: ...lywhen an ALC connection is made from the ALPHA 86to the transceiver The ALC voltage generated by the ALPHA 86is not applied internally and cannot control the amplifier itself 4 4 4 Initial Tune Up IM...

Page 13: ...nsceiver output until ALPHA 86output is 1 500 watts 15 Touch up TUNE for maximum power output NOTE Illumination of the first red LED on the RF OUTPUT bargraph indicates output has exceeded 1 500 watts...

Page 14: ...BY and back to OPR 4 4 6 ALC Grid current peaks greater than approximately 70 mA will trigger the ALC At 100 mA ALC voltage is nominally 10VDC If the transceiver requires less voltage a 100k ohm poten...

Page 15: ...7 76 15 21 25 31 84 12 band 10 24 90 46 82 10 28 10 22 87 10 28 50 19 87 10 29 00 18 88 10 29 60 12 89 Note The settings above are a COMPOSITE based on average ALPHA 86 performance characteristics The...

Page 16: ...switch intended to remove primary power from the amplifier and a crowbar to short circuit the high voltage to chassis whenever the cover is lifted These interlocks are designed to protect against dang...

Page 17: ...s are available from ETO The ETO accessory cooling fan should also be installed to compensate for reduced airflow There are no lubrication points within theamplifier Do not apply oil or grease to any...

Page 18: ...not turn off and STBY LED does not come on 1 Timing transistor on display board Q3 2 Time constant capacitor on display board C9 E Amplifier turns on time delay completes STBY LED comes on but amplifi...

Page 19: ...ode 1 Transceiver attempting to hot switch amplifier see page 6 To reset switch from OPR to STBY and back to OPR L Distorted SSB output signal with possible severe television interference TVI 1 Excess...

Page 20: ...ctly behind the 3CX800A7 tubes The drawing below shows the major board parts The fuse is adjacent to the large black finned heatsink The fuse unplugs from the board A continuity check with an ohmmeter...

Page 21: ...utput powers control trans mit receive T R and PIN diode switching circuits The 50 volt winding feeds full wave rectifier D1 D2 36V output from this supply provides tube bias and also is regulated at...

Page 22: ...and turned off In TRANSMIT the drive signal is routed via J2 Kl C27 forward biased PIN diode DIO and C26 to the input tuning networks The drive signal sampled at Kl by R ll is rectified and fed to the...

Page 23: ...ter LED driver bus and to U5 and U6 U5 and U6 are configured to drive successive LED s as their input driving voltage increases This stair step illumi nation of LED s D39 thru D58 provides a linear di...

Page 24: ...mpt to hot switch Basically the amplifier itself is T R keyed and it in turn keys the transceiver via reed type keying relay K2 K2 closes under these conditions 1 Time delay is complete 2 The amplifie...

Page 25: ...voltage sample is amplified U6A and U6B respectively then applied to U6A If the voltage ratio is correct the output will illuminate a single LED at or near the TUNE bargraph center If the ratio is inc...

Page 26: ...S1F HV POWER SUPPLY AB 088 LOW VOLTAGE P S REGULATOR AB 089 DISPLAY BOARD AB 092 PLA T E S E N S E CATHODE S E N S E r PIN DIODE T R SW I SWR DET ASSY AB 091 ALC TUNE CNTL BOARD ABX X123 J3 JA AMP INP...

Page 27: ...CERAMIC D8 11 1N270 Rl 14 220K 2V Cl 7 350uF 450V 1760VAC 1240VAC 0 28V J3 PINS AS VIEWED FRDM TOP DF BOARD J3 PIN HV SV HV MDN CATH 36V GND GND VER IP GND GND OVER IP STEP START UNBK IP 1 5 8 1 0 1...

Page 28: ...R5 R6 220K 220K 2W 1 2V R7 R8 220K 220K 2V i I 2V R9 r L 1 RIO R ll 220K S S 220K 220K 2W 2V 2V Dl 1N5388B D2 1N5388B D3 1N5388B D4 1N5388B I FBI FB2 R12 220K 2V R TD T R BOARD Tc i 470pF lKV Ql MJ850...

Page 29: ...PIN FUNCTIONS ft ORDER AS VIEWED FROM TOP OF BOARD WIRE COLORS AS MARKED D1 D4 1N5401 D5 D6 1N4004 FIGURE 8 LowV oltage Power Supply...

Page 30: ...r 14 i r 8 j 1 dS i C l l CIS C 13 C 14 CIS i ca 10uF 2BV T A N T C 10 cts KC CIS 1H4008 C 20 C 21 C 22 lOO SO C 23 C 24 C 2B OlUF OiuF C 26 1 2 S 4 O H E AC T 1 ftC7n sszn C 27 C 2S 1 C 29 C 0 Z O r...

Page 31: ...V r sev ZO FIGURE 10 C ontrol B oard S heet 2 of 3...

Page 32: ...1SV C53 0 luF 1N414S 15V R4C 100K CS7 2 2 TANT E 5 0 vi Am 2 BV C68 0 luF FIGURE 11 C ontrol B oard Sheet 3 of 3...

Page 33: ...J3 RF OUTPUT w w 1UF RF INPUT FIGURE 12 T RB oard...

Page 34: ...FAULT SWR FAULT TR FAULT 28 ee A L L CAPACITORS OF DECIM AL VALUE ARC 50 VOLT M ONOLITHIC U7 MC1401I US MCI 011 U9 MCI4001 U10 MCI4066 P I I 1 1 LD STBV HI FRONT PANEL L_ WITCHES FIGURE 13 D isplay B...

Page 35: ...S IT IO NA V A IL A B L EO NE X P O R TM O D E LO N L Y CEO 2200 L 9 2 6 T r i b C 2 1 2200 r e C 1 9 2000 1000 CIO 1000 J T L 6 15T C 1 2 1200pF PR 560pF r L 5 1 2 T j h rh cg 820pF1 B 8 0 A 4 0 o C...

Page 36: ...50 OHM IN 120pF r C6 390 C4 180 L4 10T C2 39pF FBI L3 8T L2 5T S1F LI 4T i r i b C7 560 r i b C5 220 S1E j o 25 OHM OUT 20 o o15 OlO 28V FIGURE 14 Input M atching N etwork...

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