Jump to content

Motorola's 100mw 2.4GHz HTs


Recommended Posts

Does anyone have experience with how they compare to their one-watt 900MHz HTs? How do they compare in thirty-floor buildings, shopping malls, cruise ships with many decks, and absolute range across the Grand Canyon or rooftop to rooftop? What about fancy operational bells and whistles?

Link to comment
Share on other sites

If you mean the Motorola DTR2450 handhelds, I have not used these, but have supported many 900 MHz versions in this series of Motorola portables. The DTR410/550/650's in 900 MHz are great. 2.4 GHz may benefit some users, but I tend to stay away from 2.4 GHz myself as I do not wish to raise the WiFi noise floor in my area, and the 900 MHz radios work. Perhaps as they break, they will get replaced with DTR2450's in time?

Here is a video I found online; I do not take credit for any of this video. 

 

 

 

Link to comment
Share on other sites

Also found this brochure for those interested. Looks like the DTR 550/650's with a shorter antenna for the 2.4 GHz band. Other features look the same as other DTR series radios, private calls, one to many calls, messaging. Could be useful for some users, barring the line of site issues mentioned in the video. The DTR series radios I have put into place mostly went into schools for campus wide use. The requirements were for unlicensed spectrum radio equipment that would cover about a mile wide campus, and radios that could not be heard with a cheap Radio Shack scanner, as there were concerns about stalkers and people monitoring children getting hurt on the playground, kids wandering off, and just general snooping taking place. If you can set your own hopset like the other DTR series, this can be a very secure method for short range comms. 

dtr2430_dtr2450 Brochure.pdf

Link to comment
Share on other sites

The ISM band spans 2.4-2.5GHz, Amateur 13cm has snippets in 2.300 to 2.310 GHz, and from 2.390 to 2.450 GHz... So the odds are good that the frequency hopping of an ISM band radio will go outside of the Amateur 13cm band.

US WiFi is not permitted the channels spanning 2456-2495...

Link to comment
Share on other sites

If the frequency hopping is like the DTR410/550/650 series radios, the end user programming the radio is only picking the hopset via a unique code entered into each radio. Radios with the same hopset code in them can talk to one another on that channel. The frequencies are the same but the hopset itself changes. A radio going from hopset frequency 1,6,2,4,9,3 cannot talk to a radio with hopset frequency sequence 6,2,3,1,9,4 for example. 

What I find interesting with the DTR series is that they were often sold as an alternative to FRS/GMRs radios for business use (DTR410/550/650 in 900 MHz ISM band in the United States), but many people kept the default hopset codes that came from the factory. I hear tugboats and construction crews on the default setting often in my part of the Pacific Northwest where UHF comms have been saturated with cheap radios and many users. 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use and Guidelines.