Wireless RF Transceiver 431-470MHz - Good Enough for Learning?

Other than "you get what you paid for" Anyone have a reason Not to buy this pair? 

My personal goal would be to use it as a learning tool, prepairing for adding telemetry to my projects. But it should be usefull too.  Secondary use in some project around the house, ie halloween automation, laser guided water splasher (anti-cat crap in the yard device currently in planning stage) ect.

 

Here's the Junk:


This package consists of two mini half-duplex wireless data transceiver modules and each such module is highly integrated with an ultra speed MCU and a powerful RF chip. With the introduction of the innovative yet higly-efficient encoding method, its anti-interference ability and sensitivity are significantly improved. Features like various channel options, ultra long transmission distance (1000 meters) or abundant interfaces (UART/TTL, RS-485 & RS-232) helps make the transmission of data of any size possible and eliminate the needs of writing transmission program and running complicated settings. A software application ("RF-Magic") is offered for free so that users can modify the settings of the module. Besides, its slim size and wide power supply range makes itself the most popular selection of many applications in different fields.

Features:

  • Ultra long transmission distance: 800-1000 meters @1200bps
  • Working frequency: 431-478Mhz (1KHz step)
  • +3.3-5.5V wide power supply range
  • -112dBm(9600bps) high sensitivity
  • Over 100 channels
  • GFSK modulation
  • Highly efficient cyclic interleaving error correction encoding
  • Flexible software programme option settings
  • Selectable RFID index
  • UART/TTL, RS-485 & RS-232
  • Large data buffer: 512bytes
  • Suitable for massive data transfer
  • Built-in watchdog ensures long-term operation
  • Length of antenna: 104.32mm

Product Link:

Views: 4608


Moderator
Comment by Nathaniel Caner on April 8, 2011 at 4:02pm

@bGatti

 

Yes you are correct that 433MHz is common as dirt, however the legal restriction on these "License free" devices limits them to 200 uv/meter (see FCC 47 CFR part15.209 here) measured at 3 meters. That works out to be about 50 microwatts to a 0 db gain antenna in the 420-450MHz band and gives a distance of only about 30 feet! I should point out my typo in my previous response I said the 420-470MHz band when I meant to say the 420-450MHz band.

Operation at power levels above this in these frequencies requires a HAM technician class or higher license to operate. The good news is that it's easy to get a license and then you have leagl access to equipment in this band for Amateur TV (ATV) that will give you twice the range of 900MHz systems at the same power levels!

 

Regards,

Nathaniel


Moderator
Comment by Brian on April 8, 2011 at 6:30pm
@Nathaniel / @bGatti
I like the feedback everyone, thanks. I too thought that 4.3 did not need a license either. Actually have the book to study and get my ham license. Personally, I think that anyone serious about playing with stuff like this they should take the time to be official or at least follow the rules.
Comment by bGatti on April 11, 2011 at 7:05pm

@Brian,

It's sweet "everyone get a license" and all; but bear in mind that these are restrictions on the sale and potential market for a product; as a consequence it is easier (less restrictive)  to make and sell guns, than it is to make and sell a walkie-talkie.

 

 


Moderator
Comment by Brian on April 13, 2011 at 5:36am
@bGatti - How's that saying go... "that's how the cookie crumbles" Sure in a perfect world we'd all have the license and the regulatory folks would all be on the same page and make the higher level of restrictions where they belong, but...
Comment by Alex McEwan on April 13, 2011 at 6:13am
John I have a pair but was getting nowhere with them, GSC info coming back at 9k6 but not having any luck uploading to the APM. Tried it at 19k2 and it just worked. So i think its getting bogged down at 9k6, now to do some range tests.
Comment by Nicholas Winkel on April 13, 2011 at 8:35am
I think getting a HAM License can be a valuable tool for many of the people that are serious about their projects.

What level benefits r/cer's the most? Technician, General, or Extra class?

Moderator
Comment by Graham Dyer on February 16, 2012 at 7:12am

Just got some, they work fine over short distances so far but I haven't tested them further. I've tested Config (PID, etc) changes and live Flight Data.

Comment

You need to be a member of DIY Drones to add comments!

Join DIY Drones

© 2014   Created by Chris Anderson.

Badges  |  Report an Issue  |  Terms of Service