Slide rule

[mzdenkov]

Hi,

I've bought this slide rule from the pictures bellow for my collection.
It has some scales that i haven't seen before. Do you have any
idea for what it was used for?

Best Regards.

[tggzzz]

For various types of power calculations, based on measurements from RF receivers and audio amplifiers.

[mzdenkov]

Thank you kind Sir.

Now i have a clue where to look next for more info how to use it in "basic" calculations.

Best regards.

[Stray Electron]

For various types of power calculations, based on measurements from RF receivers and audio amplifiers.

   I agree. 50 Ohms is a common impedance for receiver inputs and for RF transmission lines.  I'm sure that someone will correct me if I'm wrong but I thought audio systems commonly used 66 Ohms for low impedance inputs and outputs.

[tggzzz]

For various types of power calculations, based on measurements from RF receivers and audio amplifiers.

   I agree. 50 Ohms is a common impedance for receiver inputs and for RF transmission lines.  I'm sure that someone will correct me if I'm wrong but I thought audio systems commonly used 66 Ohms for low impedance inputs and outputs.

600ohms was common for audio frequency equipment, e.g see the bottom right socket on a HP651A oscillator

[Stray Electron]

For various types of power calculations, based on measurements from RF receivers and audio amplifiers.

   I agree. 50 Ohms is a common impedance for receiver inputs and for RF transmission lines.  I'm sure that someone will correct me if I'm wrong but I thought audio systems commonly used 66 Ohms for low impedance inputs and outputs.

600ohms was common for audio frequency equipment, e.g see the bottom right socket on a HP651A oscillator

  Ahh.  You're right. It's been so long since I worked around any audio stuff that I didn't remember the right number.   

[Smokey]

For various types of power calculations, based on measurements from RF receivers and audio amplifiers.

   I agree. 50 Ohms is a common impedance for receiver inputs and for RF transmission lines.  I'm sure that someone will correct me if I'm wrong but I thought audio systems commonly used 66 Ohms for low impedance inputs and outputs.

600ohms was common for audio frequency equipment, e.g see the bottom right socket on a HP651A oscillator

Nice Wein!