60 GOUGH ROAD, MARKHAM, ONTARIO L3R 8X7 Tel: (905) 940-1400 Toll Free: 888-86KAVAL Fax: (905) 946-3392 TEST & ALIGNMENT SPECIFICATION FOR BDA 800 MHz 20W PA (Power Amplifier) DCT000000004 Revision 1, May 17, 1999 TITLE Originator SIGNATURE DATE Product Group Team Leader Marketing Administration l Page 1 Kaval Telecom Inc.
TABLE OF CONTENTS • • • • • • • • • • • REVISION RECORD PROPRIETARY NOTICE: INTRODUCTION: EQUIPMENT: PROCEDURE • Initial Conditions • DC Regulator • Overcurrent Trip Point • Preliminary Gate Bias • Temperature Shutdown Point • Input Match • Output Match • Review Input Return Loss (Optional once process capability proven) • Measure 1 dB Compression Point.
• REVISION RECORD Revisions are tracked here as ... 1 • May 17, 1999 Updated from SMA Documents Alan Aslett PROPRIETARY NOTICE: This document contains restricted, proprietary, copyrighted information, ownership of which is retained by Kaval Telecom Inc. Kaval Telecom Inc.’s express written consent is required prior to any reproduction, implementation, publication or other use of such information.
• INTRODUCTION: The objective is to align variable elements in Kaval 20W 800-900 MHz power amps to optimize RF performance, and verify performance against specifications. This procedure applies to amplifiers to be used together with external electronic fault monitoring modules in Kaval BDA systems. Certain internal fault detection features are not aligned in such case and these adjustments are set to positions which defeat these functions.
• PROCEDURE • Initial Conditions R5 fully counterclockwise R19 fully clockwise R29 fully clockwise C19 turned out so slug is flush with top of cylinder. All stub zippers intact. RF input connected to network analyzer reflection port. Output terminated by direct connection of 50W 20 dB attenuator. Attenuator output connected to network analyzer transmission port. See Fig. 1 • DC Regulator Apply 24VDC, current limited to 2A at DC input. Verify current draw is less than 100 mA Measure voltage at U3 pin 1.
You may wish to alternate between C19 and R5 adjustments as you approach the final optimal point. Temporarily note intermodulation rejection level. Start cutting output stubs in locations E, G, F, H (in that order) in a similar manner to the input tuning scheme. After any cut. Readjust C19 and R5 to find the lowest intermod. If intermod rejection level has gotten worse as a result of the stub cut, then reattach the stub using solder and adjustment is complete.
• SAMPLE RESULTS A sample first-article unit was tuned to various popular frequencies within the 800-900 MHz band. The table below shows performance achieved and indicates the number of stub segments connected at each stub location per the attached drawing. All match and gain specifications are worst case over a band +/-12 MHz from nominal center frequency. Intermod and compression were measured midband only.
• FIGURE #1: 20W PA GAIN & RETURN LOSS MEASUREMENT SETUP l Page 8 Kaval Telecom Inc.
• FIGURE #2: 20W PA INTERMOD & COMPRESSION MEASUREMENT SETUP l Page 9 Kaval Telecom Inc.
• FIGURE #3: INPUT ADJUSTMENT l Page 10 Kaval Telecom Inc.
• FIGURE #4: OUTPUT ADJUSTMENT l Page 11 Kaval Telecom Inc.
• FIGURE #5: ASSEMBLY DRAWING REV REVISIONS DESCRIPTION ECO DATE BY APPROVED 228275-03 72900-002 3223-3182 228275-02 050275-4D 228275-01 72800-004 228275-05 228275-06 6X 10-32 X .88 CAP SCREW 2X 10-32 X .38 CAP SCREW STEPHEN MAKK & ASSOCIATES, INC. 1015 CONYERS EXECUTIVE PARK, SUITE 200 CONYERS, GEORGIA 30012 SIZE B DATE: 08-Aug-98 DWG NAME:010275-9A l Page 12 SCALE Kaval Telecom Inc. - Company Secret FSCM NO. DWG NO.
