Category: 2019 SPARC Trivia

13 April 19

In every amplifier circuit, the input resistor is critical. Any noise at the input signal will be amplified to the full gain. It is therefore of high importance to choose a low-noise resistor at the first stage, as well as a low resistance value. This is however not valid for a load resistor, since the gain that is obtained from a high resistance value outweighs the higher noise level. Because thermal noise is temperature dependent, it is very effective to cool the input stages to reach a low-noise performance.

Noise is an unwanted phenomenon for resistors. For some applications the noise properties are important. Examples are high gain amplifiers, charge amplifiers and low-level signals. Resistor noise is often specified as micro-volt, noise per volt of applied voltage, for a 1 MHz bandwidth. Thermal noise is the predominant source of noise for resistors.  It is dependent on three variables: resistance, temperature and bandwidth.

Read more http://www.resistorguide.com/resistor-noise/

Johnson_noise_intro

4 April 19

E.T Krenkel was an avid Amature Radio operator and was Chairman of the Central Radio Club until his death. He gave lectures around Russia on amateur radio as  well as he was the editor of the radio magazine for Russia. Born in 1903 and died in 1971, in 2008 a medal was named in his honer which is awarded in 2 categories,  Please See The E T Krenkel Medal Website… For more on E T Krenkel (Wikipedia) Here you will find a list of his expeditions and other posts as a radio operator…

3 April 19

It all began with one man…Frank Dawson Bliley. In 1930, one year into the greatest economic collapse our country has ever experienced, the young engineer was struggling to find steady work.

Bliley Technologies Inc. was originally founded as the Bliley Piezo-Electric Company in 1930.  Initially, we manufactured quartz crystals for the amateur radio market.  In the mid-1930s, our customers and products soon broadened to match the interests of the burgeoning military and commercial communications fields and our name was changed to Bliley Electric Company.  In 1939 we were the largest Crystal Company with 11 employees.

This was an excerpt from the Bliley History from the Bliley website…..

Bliley History Page

Bliley Website

2 April 19

 The RG designation stands for Radio Guide; the U designation stands for Universal. The current military standard is MIL-SPEC MIL-C-17. MIL-C-17 numbers, such as “M17/75-RG214”, are given for military cables and manufacturer’s catalog numbers for civilian applications. However, the RG-series designations were so common for generations that they are still used, although critical users should be aware that since the handbook is withdrawn there is no standard to guarantee the electrical and physical characteristics of a cable described as “RG-# type”. The RG designators are mostly used to identify compatible connectors that fit the inner conductor, dielectric, and jacket dimensions of the old RG-series cables.

The above excerpt is from Wikipedia for more history and information Click Here for the National Mag Lab

1 April 19

The Blaw-Knox Company was out of Pittsburgh Pa.. Its Radiator Towers were patented in July of 1930 with the tallest being 1030 ft and is in Hungry.  They also built free standing conventional (uniform cross-section) towers. They built more conventional towers than the diamond radiator ones…. For more information and pictures use the 3 links below….

WikiPedia 

Radio TimeTraveller

Jim Hawkins’ Radio and Broadcast Page

28 March 19

The Armature’s Code is from The Quarter Century Wireless Clubs Website

The Amateur’s Code
by Paul M. Segal, W9EEA (1928)
The Radio Amateur is:
CONSIDERATE never knowingly operating in such a way as to lessen the pleasure of others.


LOYAL offering loyalty, encouragement and support to other amateurs, local clubs and the American Radio Relay League, through which Amateur Radio in the United States is represented nationally and internationally.


PROGRESSIVE with knowledge abreast of science, a well built and efficient station, and operation beyond reproach.


FRIENDLY with slow and patient operation when requested, friendly advice and counsel to the beginner, kindly assistance, co-operation and consideration for the interests of others. These are the hallmarks of the amateur spirit.


BALANCED Radio is an avocation, never interfering with duties owed to family, job, school or community.


PATRIOTIC with station and skill always ready for service to country and community