You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

"But usually the vast majority of distortion of this kind is from the CB transmitter."

more bull.

Class C is defined as an anode conduction angle of less than 180 degrees. In Class C, the amplifying device is DELIBERATELY NOT OPERATED LINEARLY. Instead, IT IS OPERATED AS A SWITCH in order to reduce resistance loss. The anode conduction angle in Class C operation is usually made as short as is possible. In effect, the tank circuit makes the RF output sine wave--like a bell that is struck at a constant rate by a hammer. This is similar to the principal behind SPARK TRANSMITTERS which were NOTORIOUS FOR PRODUCING HIGH LEVELS OF HARMONIC RADIATION. that's what switches do.

The efficiency of a typical Class C amplifier is high. When compared to a Class AB1 or Class AB2 amplifier operating at the same power input, a Class C amplifier will deliver a received signal increase of about 1db--in other words, 1/6 of 1 S-unit. However, SIGNIFICANT TRADE-OFFS are required to achieve that 1/6 of 1 S-unit. As is the case with Class B operation, the DISTORTION from Class C operation is so high that SSB operation is precluded. Only CW, FM or FSK operation is practical. THE HARMONIC OUTPUT LEVEL from a Class C amplifier IS SUBSTANTIAL. Extra filtering is usually needed to control harmonic radiation.

<blockquote data-quote="freecell" data-source="post: 118977" data-attributes="member: 30">&quot;But usually the vast majority of distortion of this kind is from the CB transmitter.&quot;more bull.Class C is defined as an anode conduction angle of less than 180 degrees. In Class C, the amplifying device is DELIBERATELY NOT OPERATED LINEARLY. Instead, IT IS OPERATED AS A SWITCH in order to reduce resistance loss. The anode conduction angle in Class C operation is usually made as short as is possible. In effect, the tank circuit makes the RF output sine wave--like a bell that is struck at a constant rate by a hammer. This is similar to the principal behind SPARK TRANSMITTERS which were NOTORIOUS FOR PRODUCING HIGH LEVELS OF HARMONIC RADIATION. that&#039;s what switches do.The efficiency of a typical Class C amplifier is high. When compared to a Class AB1 or Class AB2 amplifier operating at the same power input, a Class C amplifier will deliver a received signal increase of about 1db--in other words, 1/6 of 1 S-unit. However, SIGNIFICANT TRADE-OFFS are required to achieve that 1/6 of 1 S-unit. As is the case with Class B operation, the DISTORTION from Class C operation is so high that SSB operation is precluded. Only CW, FM or FSK operation is practical. THE HARMONIC OUTPUT LEVEL from a Class C amplifier IS SUBSTANTIAL. Extra filtering is usually needed to control harmonic radiation.</blockquote>

[QUOTE="freecell, post: 118977, member: 30"] "But usually the vast majority of distortion of this kind is from the CB transmitter." more bull. Class C is defined as an anode conduction angle of less than 180 degrees. In Class C, the amplifying device is DELIBERATELY NOT OPERATED LINEARLY. Instead, IT IS OPERATED AS A SWITCH in order to reduce resistance loss. The anode conduction angle in Class C operation is usually made as short as is possible. In effect, the tank circuit makes the RF output sine wave--like a bell that is struck at a constant rate by a hammer. This is similar to the principal behind SPARK TRANSMITTERS which were NOTORIOUS FOR PRODUCING HIGH LEVELS OF HARMONIC RADIATION. that's what switches do. The efficiency of a typical Class C amplifier is high. When compared to a Class AB1 or Class AB2 amplifier operating at the same power input, a Class C amplifier will deliver a received signal increase of about 1db--in other words, 1/6 of 1 S-unit. However, SIGNIFICANT TRADE-OFFS are required to achieve that 1/6 of 1 S-unit. As is the case with Class B operation, the DISTORTION from Class C operation is so high that SSB operation is precluded. Only CW, FM or FSK operation is practical. THE HARMONIC OUTPUT LEVEL from a Class C amplifier IS SUBSTANTIAL. Extra filtering is usually needed to control harmonic radiation. [/QUOTE]

Top Bottom