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MAY 2000 San Francisco Roy Trumbull - Editor roy547@msn.com Bill Dempster - Artist |
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Zack Electronics - (800) 998-3947 Advanced Marketing - Frank A. Santucci - (650) 365-3944 Belden - Steve Lampen - (415) 440-8393 Orban - Rick Sawyer - (360) 715-1913 MARCOM - Martin Jackson - (408) 768-8668 William F. Ruck, Jr. Broadcast Engineer - (415) 995-6969 RF Specialties of California - Bill Newbrough - (888) 737-7321 Hammett & Edison, Inc. - Dane E. Ericksen, P.E. - (707) 996-5200 LeBLANC - David A. Hill - (650) 574-4600 Gentner Communications - Kelly Hanning - (800) 879-9317 Improbable Missions Fource - Mike Schweizer - (888) 4-ISDN4U Broadcast Systems - (800) 801-2623 Brill Electronics - Larry or Sam - (510) 834-5888 Kathrein (Scala Division) - Michael Wm. Bach - (541) 779-6500 Harris - John Briskie - (650) 593-1837 ADC Broadcast Systems Division - Russ Erickson - 877-440-7877 |
BABES/SBE LUNCHEON ON WEDNESDAY May 31st
As usual, our luncheon will be at Sinbad's just south of the Ferry
Building on the Embarcadero near the foot of Mission St. We meet
at 11:30 and are seated at 12:30.
Our speaker will be Marty Acuff, Product Manager from ORBAN. He will have a presentation
on the new Orban Optimod 8400 audio processor.
Willie has been at St. Rose Hospital in Hayward for the last five weeks after suffering complications from diabetes. Doctors amputated part of his leg. He has some up days and down days according to his wife Jeannie. He is on Dialysis every other day.
Willie is truly a legend in California TV news. He started with film and only recently retired from KTVU. He has covered or been a part of nearly every major news event of the last thirty years. He has hosted the Chinese News Years Day parade for KTVU. He has won every major award from Emmys to Bay Area Press Photographer Awards; too many to list. He is a no bull kind of guy! He tells you in no uncertain terms when you have failed and is equally emotional when you succeed! I learned a great deal from this great man. He helped mold the way I shoot to this day. Willie Kee convinced me to come to the Bay Area.
If you would like to send him a card or letter, send it to his home:
Willie Kee
32979 Lake Wawasee St.
Fremont, Ca., 94555
Anyone interested should contact Paul Marks at KBLX Radio - (415-284-1029).
Duties include maintenance, repair, and installation of studio and transmission equipment, and assisting the chief engineer. Interested parties should contact Paul Marks at KBLX Radio (415-284-1029).
The single adjustment that will impact the DTV signal the most is the setting of the input path. The input cavity must tuned to the center of the channel and the driver to input cavity match must be set for minimum reflected power and 6 mHz bandwidth.
The bandwidth setting, usually reached by adjusting the tuner between the driver and input cavity, can be set to slightly over 6 mHz using a network analyzer. If a spectrum analyzer and tracking generator are used, the bandwidth needs to be wider and more drive will be required. This is due to the lower precision of the measurement versus doing it with a network analyzer.
The overall response can be set flat within a fraction of a dB. There will be a slight saddle at mid-channel. With no correction, the initial channel skirts will be about 30 dB. The indicated EVM (error vector magnitude) will be 9% to 12% and the S/N somewhat greater than 18 dB.
The vector signal analyzer display will show improved eye and constellation patterns after the correction is done. Typical EVM readings will be lower than 4% and the S/N greater than 27 dB.
A proper nonlinear correction prior to doing the linear correction will lower the EVM and increase S/N numbers.