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.

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.

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.

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.

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 )