Jump Links to equipment on this page
FlightDopp UAV DF
URX-1 Utility Receiver
MicroBeacon APRS Tx
WinBeacon Config Program
PreDopp Module

Jump links to equipment on other pages
PicoDopp Basic DF
GPS Display Program
IBM Display Program
PDA Display Program
FoxPlot PDA Program
PicoDopp Pelorus display
PicoDopp Numeric display
PicoDopp MultiDisplay PicoDopp MiniAntenna NorthUp Compass
SquawkBox Transmitter
MicroHunt Transmitter
YagPlot DF

Background information
About T-hunting
More About T-hunts
About Doppler DFs
About PalmOS PDAs
About us

This page contains new products, semi-custom products and / or "experimental" products. All the equipment here has been built and tested, but these items are not ( for various reasons ) completely suitable for "general retail" sales. Still, some folks might have an immediate need or a keen interest in this equipment, and inquiries are invited.

The posted prices are ( somewhat ) "negotiable", depending on customer needs.

FlightDopp DF UAV / RPV ADF : Price TBD, US$ 1800 - 2500

    The FlightDopp DF essentially is a PicoDopp DF with an integral VHF/UHF single-band reciever. Operation is 100% by remote control, via RS232. Designed for use in RPV / UAVs, weight is 9 ounces and power is 11 to 18 VDC, 105 mA.

    The dual-conversion receiver can be built for any 10 MHz band from 100 to 1000 MHz, with 1 KHz tuning steps. AM and/or FM modulation detection, audio out for downlink monitoring. Remote control of recieve frequency, AM and FM audio levels, and squelch level, via RS232.

    FlightDopp Includes five assemblies : one DF unit and four ANTENNA boards. The user must provide an on-board host computer ( and software ) to operate the DF and capture / employ the resulting DF data, as desired.

    Additional features are available : RSSI / signal freq error / SquealTone audio. State your requirements for a specific quote.

  • Single-band UAV / RPV Doppler ADF
  • 10 MHz tuning span, 100 to 1000 MHz
  • RS232 remote control and DF data output
  • AM and FM detection for downlink audio
  • Remote frequency control, 1 KHz steps
  • Remote control of AM / FM / squelch levels
  • Additional features per customer spec
  • 11-18 VDC operation, 105 mA
  • Assembled and tested : US$ 1800-$2500

more FlightDopp DF info

A & T : US$ 1800 - 2500
URX-1 Utility VHF / UHF Reciever : US$ 259

    The URX-1 Utility Receiver is a single-band VHF/UHF FM reciever with RS232 remote control of frequency, audio and squelch levels. Sold as an assembled / tested PC board, and created as a "companion" reciever for the DF equipment on this website, it can also serve well as a general-purpose FM reciever.

    The URX-1 design is very flexible, and can be built to span a 10 MHz band, ( from 100 to 1000 MHz ) in 1 KHz steps. URX-1 designs presently exist for 120-130 MHz as well as 140-150 MHz and 465-475 MHz.

    Measuring 1.75 x 3.78 inches and weighing 0.2 ounces, DC 10-18 volts with 30 mA "idle" load current, ( squelch closed ) the URX-1 is especially suited for situations where light weight, small size, modest power consumption and / or 100% remote control are required.

  • Single-band VHF/UHF FM "utility" reciever
  • 10 MHz tuning span, 1 KHz steps, 100-1000 MHz
  • RS232 remote control, vol/sql/freq
  • NV memory storage of control settings
  • 1.75 x 3.78 x 0.35 inches, 0.2 ounces
  • 11-18 VDC operation, 30 mA ( sql = closed )
  • Trimpots optional for vol/sql settings
  • AM detection optional
  • Assembled and tested : US$ 259

more URX-1 info

A & T : US$ 259
MicroBeacon TX APRS Beacon Transmitter : US$ 139

    The MicroBeacon TX is a 2 meter APRS beacon transmitter that reports GPS position / altitude at regular time intervals. User must provide an RS232 GPS reciever, an antenna and DC power, 7 to 14 VDC.

    Output power is over 2 Watts with 12 VDC, frequency 144-148 MHz in 1 KHz steps. User-defined message parameters, including TX frequency, call sign, repeat time and APRS map symbol. A free config program ( WinBeacon ) is provided to set parameters. ( see next item, this page )

    The MicroBeacon TX measures 1.20 x 2.20 inches, and weighs 1/4 oz. Sold only to licensed amateurs.

  • 2 Watt / 2 meter APRS beacon TX
  • 144-148 MHz x 1.0 KHz steps, user-defined
  • Lat / Long / Alt position reports
  • RS232 GPS input, NMEA sentences
  • Uses GPRMC / GPGGA sentences
  • 5VDC available for GPS receiver
  • User-defined message parameters, NV storage
  • Free CONFIG program ( see next item )
  • 1.20 x 2.20 x 0.13 inches, 1/4 ounce
  • 7-14 VDC operation, 10 mA ( idle )
  • Assembled and tested : US$ 139

more MicroBeacon info

A & T : US$ 139
WinBeacon Config Program for MicroBeacon TX : FREE

    The WinBeacon config utility program allows user configuration of the MicroBeacon APRS transmitter ( see item above, this page ) with an IBM PC, via a serial COM port. The program allows user selection of transmit frequency, transmit repeat time interval, callsign + SSID, VIA1 / VIA2, APRS map symbol/icon, and a user defined comment. When a new configuration is installed, the MicroBeacon will perform a test transmission on the new TX frequency for 9 seconds, to verify reciept of the new profile data.

  • Free CONFIG utility program for MicroBeacon TX
  • User selection of all major beacon parameters
  • Test TX verifies new data was accepted
  • COM1 thru COM8 selectable for output
PreDopp Audio PreSelector : US$ 109

    The PreDopp audio preselector is a module that extends the useful frequency range of a Doppler deep into the low VHF / upper HF frequency range. Doppler tone modulation at such frequencies is microscopic, and much too low for normal detection by a PicoDopp DF. The PreDopp boosts the DF tone level with a VERY narrowband ( sub - Hz BW ) audio filter, followed by significant audio gain.

    The PreDopp module does NOTHING to improve antenna sensitivity at low frequencies, so the hunted signal MUST be strong and / or nearby, to overcome antenna losses. Trimpot adjustments are provided for gain and bandwidth, test points are provided for the adjustment process.( requires use of a scope and understanding of the circuit operation )

  • Audio PreSelector for PicoDopp DF
  • Minimum BW = 1/8 Hz
  • DF tone gain = 0 to 30 dB
  • 12 VDC @ 10 mA
  • For low VHF / upper HF Doppler work
  • For strong / nearby signals
  • Requires tech skills to adjust / use
  • Assembled and tested : US$ 109

PreDopp TechNotes

A & T : US$ 109
Copyright © Doppler DF Instruments