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Summary of Contents for Ehrhorn Technological Operations ALPHA 76A
- Page 1 OPERATING A N D T E C H N IC A L M A N U A L HIGH FREQUENCY LINEAR POWER AMPLIFIERS A L P H A 76A, 76PA, and 76CA E H R H O R N T E C H N O L O G I C A L O P E R A T I O N S , IN C . CAÑ...
- Page 2 Schematic d ia g r a m s ..........13 Front panel v i e w ........Front cover SECTION 6 - STANDARD ELECTRICAL PARTS LIST ......ET0/"ALPHA" PRODUCTS WARRANTY ........Back cover EHRHORN TECHNOLOGICAL OPERATIONS, INC, CANON CITY, COLORADO 81212 0180 U.S.A.
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Page 3: Section 2 - Installation
- 2 - SECTION 2 INSTALLATION 1. Unpacking: Carefully remove am plifier and transformer from cartons; SAVE PACKING MATERIAL FOR RE-USE -- SHIPMENT OF YOUR ALPHA IN OTHER THAN FACTORY PACKING MAY RESULT IN DAMAGE NOT COVERED UNDER WARRANTY! Inspect close ly for evidence o f shipping damage; i f found, n otify delivering c a rrie r and s e l le r at once. -
Page 4: Section 3 - Operation
4. Physical Location: Your ALPHA must be located so that intake of cool a i r through the rear panel, and exhaust of warm a ir through the top cover per forations, is not impeded in any way. A minimum of 4 to 6 inches of cle ar ance should be allowed behind and above the amplifier for a i r circulation. - Page 5 SECTION 3 OPERATION 1. Control Functions: BAND - Selects tuning range o f am plifier, indicating the nominal center o f the band in MHz. TUNE - Controls the operating frequency. In general, higher frequency bands (14 & 21 MHz, etc.) tune toward the "0" end o f the vernier dial scale, while lower frequency bands tend to tune toward the 50-100 end.
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Page 6: Initial Tune-Up
. example, i f the ALPHA 76A is tuned up for maximum output with 1400 VDC plate voltage (typical LV) and with the drive level set so that the... - Page 7 Press FW D and ca re fu lly adjust LOAD for maximum RF WATTS meter reading. Then adjust TUNE for maximum indication on the meter (FWD RF WATTS). Repeat the process of alternately peaking f i r s t LOAD, then TUNE, until no further increase in FW D RF WATTS can be achieved.
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Page 8: Operating Notes
(150 mA); normal operation requires only 50-60 m A for two tubes or 75-90 m A for three. (b) INTERLOCKS - The ALPHA 76A series is equipped with switches which shut o ff a-c power and short out the high voltage power supply when the cover is not securely fastened in place. -
Page 9: Troubleshooting Hints
TABLE I I — TROUBLESHOOTING HINTS SYMPTOMS POSSIBLE CAUSE/CURE 1. Won't turn on; nothing happens a) External a-c wire, fuse, or breaker when ON button is pushed. open or missing. Cover a-c interlock switch open. Fuse FI or F2 blown or missing. 2. -
Page 10: Theory Of Operation
OFF or in STBY or receive conditions, permitting normal transceive operation. K4 switches the ALPHA 76A into the transmit configuration when an external s h o r t - c ir c u it i s placed across RELAY control jack, J3. - Page 11 FWCT r e c t i f i e r D107-D108 and f i l t e r capacitor C108 provide +28 V for bias and control c ir c u it s . A 25 VAC transformer winding i s "bucking" connected to pro vide approximately 95 VAC for the blower motor, re su ltin g in reduced noise but v i r t u a l l y the same cooling a i r delivery as at fu ll voltage.
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- Page 14 TO POWER SUPPLY...
- Page 15 tHRHORN TECHNOLOGICAL OPERATIONS, INC. I MODELS: PA-76A, -76P CAÑON C I T Y , CO 8 1 2 1 2 DRAWING: A L C/WATTME...
- Page 18 N O T E S : A L L I N T E R F Í "Ù ☆ A L L R E S I S T O...
- Page 19 SECTION 6 -- STANDARD ELECTRICAL PARTS DESCRIPTION DESCRIPTION SYMBOL SYMBOL L1-L3 1 5uhy/lA r f choke Howard #3-90-8507 1 to 2.5 mhy r f choke .002uf/lKV disc ceramic Cl, C2 L202 1 mhy miniature rfc .002uf/3KV disc ceramic C3-C6 C9,C14 ,C15 .02uf/lKV disc ceramic 2N6027 P.U.T.
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