Sir,
The sweep will in theory not be effected due to the extra bandwidth with respect to flattness. Similar to putting a 1-GHz splitter in a 750-MHz system. You just do not want to go with less bandwidth. The equlizer will have a "logrithmic cable" signature and will have X-dB tilt for specified levels. Tilt and flatness are obviously not to be confused. Neither should level and response signature.
What WILL be effected is the actual gain at 750-MHz in your instance with an 870-eq. The standard equalizer has a minimal insertion loss at the highest designed frequency (typically 1-dB insertion loss) and the insertion loss increases as frequency decreases. The actual loss varies depending on the value equalizer. The higher the value, the more insertion loss at 750 in your situation.
If you use an 870-eq in the 750MHz system, to set the amplifer up correctly, you should have a cross-reference equalizer chart for 55-870MHz that indicates actual loss at 750. With this loss, subtract the insertion loss (at 750) from the actual input pad utilized for correct input attenuator selection OR your amplifier will have lower output. Many people who use higher bandwidth EQ's do not allow for this correction and the levels in many instances are low. Note, this is not only for input EQ's but also interstage as well. Depending on the overal input, the 870-eq possibly may not be used due to the excessive loss.
I hope that I have helped you. If you have any questions, please call or e-mail.
Greg Tobin
(-REDACTED-)
(314_ 422-4423 cellular
Re: 870 Eq's
Member #: 7190
Registered: 1996-2001
Posted:
483
Name:
Greg Tobin
Name:
Greg Tobin
Company:
Interactive Broadband Technical Services
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HFC Engineer/Consultant
Location:
www.interactive-broadband.com
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Experience:
~45 years
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