Use of VFO in transmitters

Status
Not open for further replies.

demetal

Full Member level 5
Joined
May 2, 2011
Messages
275
Helped
21
Reputation
42
Reaction score
21
Trophy points
1,298
Location
Kingdom Of Kochi
Visit site
Activity points
3,173
Hi,

What is the main purpose of using Variable frequency Oscillator in transmitters and receivers.... What is the dependency of its frequency to the system...?


Thank you
 

Usually yes although it is possible in some systems that there is more than one local oscillator. In most cases VFO = variable frequency local oscillator, one you adjust to set the frequency rather than being fixed frequency.

Brian.
 
Reactions: demetal

    demetal

    Points: 2
    Helpful Answer Positive Rating
So which is the best method for generating Variable frequency... analog type or Digital type like DDS .....
 

As far as RF goes, it doesn't really matter. Each type has it's good points and bad points, analog can give better noise performance but it more prone to mechanical effects such as vibration and expansion/contraction as temeperature changes, these cause drifting of the frequency. DDS is more stable because it is referenced to a quartz crystal timing source but being digitally controlled it needs additional computing power to set the frequency.

Brian.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…