Sunday 31 January 2016

DIFFERENCE BETWEEN ISO 9001:2008 & ISO 9001:2015 STANDARDS

Followings are the  difference between ISO 9001:2008 & ISO 9001:2015 standards:

ISO 9001:2008
ISO 9001:2015
0. Introduction
0. Introduction
1. Scope
1. Scope
2. Normative References
2. Normative References
3. Terms and Definitions
3. Terms and Definitions
4. Quality Management System
4. Context of the Organization
5. Management Responsibility
5. Leadership
6. Resource Management
6. Planning
7. Product Realization
7. Support
8. Measurement, Analysis and Improvement
 8. Operations
9. Performance Evaluations
10.Improvement

CLAUSES OF NEW ISO 9001:2015 STANDARD

Followings are the new clauses of new ISO 9001:2015 standard:

0. Introduction
1. Scope
2. Normative References
3. Terms and Definitions
4. Context of the Organization
5. Leadership
6. Planning
7. Support
 8. Operations
9. Performance Evaluations
10.Improvement

Thursday 28 January 2016

INSERTION LOSS

Transmission feed line system performance plays an important
role in wireless network coverage. Insertion loss measurement
is one of the critical measurements used to analyze transmission
feed line installation and performance quality. 
In wireless communication systems, the transmit and receive
antennas are connected to the radio through coaxial cable
and/or waveguide transmission lines .
Insertion loss measures the energy absorbed by the transmission
line in the direction of the signal path in dB/meter or dB/feet.
Transmission line losses are dependent on cable type, operating
frequency and the length of the cable run. Insertion loss of a
cable varies with frequency; the higher the frequency, the
greater the loss.

In other words, insertion loss is the loss of signal power resulting from the insertion of a device in a transmission line or optical fiber and is usually expressed in decibels (dB).

If the power transmitted to the load before insertion is PT and the power received by the load after insertion is PR, then the insertion loss in dB is given by,
10 \log_{10} {P_\mathrm T \over P_\mathrm R}