Land Surveyor Community Forum

Can someone explain to me the difference?  I'm potentially buying a R8 with 430-450 internal radio and a HPB450 with the same.  Will I be compliant with FCC?  Thanks.

You need to be a member of Land Surveyors United - Surveying Community & Forums to add thoughts!

Join Land Surveyors United - Surveying Community & Forums

Email me when people reply –


  • Party Chief

    As long as the external radio is a Trimble as well, now there will be internal freqs set up from 0 to 5 for your channels..they have to match each other. They come with initiate freqs from the factory, and those are standard and commonly used by trucks, boats, handle radios etc. the FCC will sale you your own freqs that will isolate you from getting stepped on, causing you to loose lock/ or fix solution. If your not going to purchase from the FCC you will need to get you a radio/scanner from radio shack for about $85 that will scan freqs. You can dial your freqs in and see if you are getting noise or not....this can make a large difference in you having a productive GPS ay or not.

    If the R8 and the ext. radio are coming from the same source, then they have likely been paired. If not you will have to set them up with the utility program, that lets you look ind=side the radios.

    Hope this helps let me know if you have additional questions.

    Skip Farroiw

    • yes the system is used and is part of a working environment. The external radio and rover were originally bought together.  Not questioning whether they will work together.  I was told that 430-450 were usually Government frequencies and the 450-470 were more common in private survey companies.  I just don't want to buy something that I'm not suppose to be using.  As far as FCC 25mhz width......I don't think the external radio is compliant with that.  I'm in really rural areas and don't think I will have much trouble.  Thoughts?

      • Party Chief

        sorry i read your question wrong...i'm almost positive the HPB450 is a 35watt ext. base radio and it is not compliant with the current FCC 25 watt new rule. Also most of the ones we use are 450-470. 

This reply was deleted.

Answer As your Facebook Page

More from Land Surveyor Forum

Land Surveyor Community Forum

Most land surveying related topics are evergreen - meaning the topics of discussion are many times timeless.  If you have a question regarding Land Surveying in general, this is the place to ask your questions.    

Add Discussion

Forums for  Hubs for Land SurveyorsHowever, if you have a questions regarding a specific type of Land Surveying Equipment, Surveying Software, Land Surveying History or other topics related to land surveying, you will find that our Community Hubs all have dedicated forums.   Asking your questions inside these Hub Forums will ensure that you are asking a targeted audience of land surveyors who are following those topics.

Forums for Location Based Chapter Hubs for Land SurveyorsLikewise, you will find that all of our Location Based Chapter Hubs have dedicated forums for discussing land surveying topics related to specific locations around the world.  Asking your question inside the appropriate place inside the community will most likely get you the most feedback.   Enjoy!  We look forward to helping you solve your problem or expand your knowledge of land surveying.

Below are the categories for our general forum which spans entire global community.

Community Apps Updates