×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

(OP)
1) How you can select which frequency is best for a specific application?
2) Does the same path loss equation apply regardless of the frequency used?

The simple rule-of-thumb formula for path loss INCLUDES frequency as one of the input parameters.

Pathloss in dB = 32.45 + 20*log(f) + 20*log(d)

where
f = Frequency in MHz
d = distance in kilometers

Thing is, antenna gain (for a given physical size) can go up with frequency, and that's not taken into account by the path loss formula. This little detail certainly prevents the VLF bands from being overcrowded with folks seeking very low path loss...

The best frequency is a frequency that other people are not using. I'm not sure how that would jive with the particular SS system you're using. Also you antenna system matters.

PS: I don't know much about SCADA in particular. Stand by for others...

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!