Difference between revisions of "RF Engineering"
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− | Before getting started you may want to study or refresh your knowledge | + | '''Before getting started you may want to study or refresh your knowledge |
− | of [http://en.wikipedia.org/wiki/Ohm's_law Ohm's Law | + | of [http://en.wikipedia.org/wiki/Ohm's_law Ohm's Law].''' |
==Electricity Supply== | ==Electricity Supply== | ||
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− | Where ''' | + | Where '''i''' is the DC current required during transmit (TX), receive (RX), and stand-b (SB) operation the above is for a 50%, 50%, 90% duty cycle. |
If a different duty cycle is required change the percentages in the equation. | If a different duty cycle is required change the percentages in the equation. |
Revision as of 00:14, 7 April 2010
Before getting started you may want to study or refresh your knowledge of Ohm's Law.
Contents
Electricity Supply
Alternating Current (Mains)
UPS & Battery Backup
How to calculate what size battery system is needed for emergency backup
- Determine the average current drawn by all equipment to be provided with emergency backup power.
- Find the DC current drain during transmit, receive and stand-by operation.
- Determine the equipment's Duty Cycle.
- Duty Cycle is expressed as a series of three percentages:
- Transmit
- Receive
- Stand-By
- Determine the equipment's Duty Cycle.
- Find the DC current drain during transmit, receive and stand-by operation.
Use the following formula to calculate the average DC current required.
- IA.VE=(I_TX)(.5)+(I_RX)(.5)+(I_SB)(.90)
Where i is the DC current required during transmit (TX), receive (RX), and stand-b (SB) operation the above is for a 50%, 50%, 90% duty cycle.
If a different duty cycle is required change the percentages in the equation.
To determine the battery size required multiply the average current by the number of hours of backup power required.
Battery Size = (IA.VE)*(Hours of backup power required)
Direct Current (Battery)
Grounding
Manuals
General Electric
Lynchburg Book of Instructions (LBI) Term for GE Manuals
All LBI manuals are in Adobe PDF format and under 5Mb
- LBI-39148B Standards For Site Construction & Contract Install
- LBI-39179B Fiberglass & steel Comp & Lightweight Comm Shelter
- LBI-39184A Concrete Shelter Specifications - Bullet Resistant
- LBI-39185 Tower Requirements & General Spec - Installation
Motorola R56 Standards and Guidelines for Communications Sites
- Motorola Part Number 68-81089E50 Printed version
- Motorola Part Number 98-80384V83 CD-ROM version