RF Transmitters

The BeeLine Transmitter solves one of the biggest problems encountered while using other types of low power transmitter beacons, the frequency is user programmable!   You no longer have to wonder who else is using 433.92Mhz, because you can program your beacon to any frequency you choose within the 70cm ham radio band. Click for a picture showing the  assembled transmitter with antenna.

 It's also very economical.  No need for a dedicated receiver;  use your FM scanner or hand-held ham radio!  Add an easy to build Yagi antenna, and you're in business for a fraction of the cost of other systems. 


(This picture shows the serial version of the programming interface (in yellow).  While this is still available, the standard package deal contains a USB enabled programming interface board that includes an integrated battery charger).

  • Read the FAQ.
  • Operates on any frequency in the 70cm (420-450Mhz) amateur band.
  • Documentation and configuration programs can be found on the Resources page.
  • Reviews:  See what eHam  has to say, or read the review from Rockets magazine
  • Don't have an amateur radio license?  Check out the ARRL web-site! Getting a license only takes a few days after passing a simple multiple choice exam!
  • RDF Beacon Comparison 

Coupled with a  lithium-poly battery lasting  more than 48 hours, the entire unit weighs just 30 grams (1 oz). and fits inside a 29mm coupler tube (id= 1.14").  Even though a specialized charger is required, you will realize a cost savings after just a few flights vs. using expendable (and heavy)  9V alkaline batteries. 

 When assembled, the battery fits behind the transmitter, and the entire board is wrapped in protective heat shrink.  The 1/4 wave whip antenna is 6.25" long.


  • High Power Rockets 
  • RC Airplanes
  • Hot Air Balloons
  • Fox Hunting
  • Law Enforcement / Asset Tracking 


  • User definable FM (default) or CW modulation
  • Frequency optimized for the 70cm amateur radio band 
  • Frequency range user programmable in 250Hz steps from 420-450 Mhz
  • 1/4 wavelength whip antenna
  • Optional SMA antenna connector
  • Output power user selectable from  -20 to +12 dBm (-8 to +20 with the MP version)
  • Small size:  less then 1"x2", fits inside a 29mm body tube and weighs less than 1/2 ounce!
  • Small size:  less then 1"x2", fits inside a 29mm body tube and weighs less than 1/2 ounce!
  • PC programmable call sign, frequency, and tone parameters (requires optional USB adapter)
  • On board voltage regulator for 4-12 volt input (see documentation for restrictions)
  • Low voltage battery protection
  • Range: Tested on the ground to over 5 miles, and over 180 *miles* in the air!


  • SMA Antenna
  • 210 mah Lithium Poly battery.  Lasts more than 48 hours.
  • USB interface / single cell LiPo charger

This product will be made available to licensed amateur radio operators only, or others with the proper authorization to transmit on the desired frequency.


Download the user documentation


Here's a view of the configuration software used to set the transmitter parameters.  Click to download.  





Amateur radio license or other authorization required.