FoxRex-144 Foxoring Receiver New

FoxRex-144 FoxRex-144

Similar to the well know 80m receiver Foxrex-3500 (see below) the VHF foxoring receiver FoxRex-144 offer a great solutuon for VHF fox hunting. The receiver is built into a solid aluminium profile, which at the same time functions as the boom for three antenna elements. So the antenna is a three element Yagi antenna with good directionality, suitable for direction finding on 2m (144 MHz). The element construction follows an idea of WB2HOL and are made from flexbile steel tapes, in fact they are recycled tape measures. This makes the antenna nearly undestructible and extremely lightweight.

The central antenna boom houses the receiver, an LC display, the rechargeable battery and all controls. A coaxial DC connector is used for charging the battery with a 12 V supply. This is very useful, because you can recharge the battery while driving in your car to the foxoring competition. A 3.5mm headphone plug serves as an On/Off switch, i. e. operation is only possible with a headphone (32 Ω).

All operating controls of the FoxRex-144 are arranged in a well thought out layout: easy to reach and not to interfere with operation while on the chase to the transmitter site. An LC display with a size if 2x8 characters shows frequency, timer, the current transmitter and many other details. A slide switch selects the mode: normal operation, attenuator operation, menu programming. A rotary encoder with push button serves as main control for the menu settings. On the side a separate volume control is located. A small microprocessor controls the receiver functions, i. e. frequency, timer, alarms and so on. It supports various foxoring modes, as they are used in official international competions around the amateur radio world.

The receiver itself is a superhet design with 107 MHz IF and a quartz filter. A quartz controlled PLL is used for sufficiently precsie frequency control, the frequency range is from 143.9 to 148.1 MHz. The sensitivity is 0.1 µV, absolutely sufficient for the ranges used at regular foxoring events. An adjsutable attenuator helps in close range detection of the transmitter. The signal strength is show as a bar graph in the LC display and also presented as an acoustic signal in the headphone. The processor can be calibrated in respect to the transmitter output power, with this calibration a rough distance estimation is made. Depending on the selected competion mode (European style, chinese style etc.) up to 11 frequencies for different foxes can be stored. The built in battery supports the receiver for about 30 hours, an automatic power down mode prevents accidental deep discharge. The weight of the Foxrex-144 is only 530 g.

Order No.
FOXREX-144 FoxRex-144 Foxoring Receiver VHF 485.00 € Add to shopping cart New In stock, shipped in 1 to 2 days.
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Download: User Manual Foxrex-144 (PDF, EN, 4.6MB)

FoxRex-3500 Foxoring Receiver

FoxRex-3500 FoxRex-3500 ARDF Rx

The FoxRex-3500 is based on the successful 'FJRX85' receiver design by N. Roethe, DF1FO. Consequently the customer can expect a lightweight and solid receiver, which is easy to use, even during a competition event.

The Foxrex-3500 works in the frequency range from 3490 to 3660 kHz (80m band). It can store up to 4 frequencies, the usual fox hunting modes like 'Classic', 'Sprint' etc are supported. A timer reminds the hunter about the approaching end of transmission of a fox. The receiving frequency can be easily adjusted in 100 Hz while on the move.

The receiver is packaged in a solid aluminium case and is shipped with two antennas. The entire setup is robust enough so the hunter can cut through the underwood on a chase, without damaging the device. The FoxRex-3500 is easy to operate, with just two push buttons the receiving direction can be switched for precise 'minimum bearing' direction finding. Optical (LC Display) and audible feedback (headphones) for signal strength and proximity alarm help to adjust the running direction without stopping.

The power supply is donewith a built in rechargeable battery, the manufacturer claims an operating time of about 40 hours. The battery can be charged by a 12 V DC source. This is ver useful because you can charge the receiver in the car. A LED signals the charging state of the battery. A built-in attenuator can be adjusted in 5 dB steps down to -110 dB. The selectivity of the receiver is about -40 dB at 8 kHz, which is absolutely sufficient for an ARDF receiver.

For operation a headphone is required. The manufacturer recommends a stereo headphone with 32 Ω impdance, the connector is a 3.5mm stereo phone plug. A simple headphone is included.

  • FoxRex-3500
  • NUmber of foxes adjustable from 2 to 10
  • 4 memories for frequencies
  • Function lock
  • Adjustable fox beacon time
  • Various ARDF styles: Classic, Sprint, Foxoring, 'Czech' etc
  • Acoustic proximity warning
  • Acoustic S Meter
  • Distance estimation
  • Menu lenaguages: German, English
  • Calibration of battery voltage sensor
  • Calibration of frequency
  • Calibration of the attenuator
  • Automatic power off timer
Order No.
FOXREX-3500 Foxoring/ARDF Receiver 80m 329.00 € Add to shopping cart In stock, shipped in 1 to 2 days.
Info freight charges
Download: Operating manual Foxrex-3500 (PDF, EN, 4.5MB)
Download: Bedienungsanleitung Foxrex-3500 (PDF, DE, 0.7MB)

RED-FOX-144, RED-FOX-3500 Foxoring Transmitter New

RED-FOX Sender

The RED-FOX Foxoring transmitters are very small and light transmitters for ARDF (Amateur Radio Direction Finding). They correspond partially to the official rules for ARDF competitions (Foxoring) and make it very easy to start practicing for a competition. The transmitters are equipped with two wires as a dipole antenna. This results in a range of approx. 100 to 300m for the 80m transmitter and up to 500m for the 2m transmitter, depending on the terrain. The transmitting power is less than 0.1 mW. The power supply is provided by a CR2032 button cell included in the scope of delivery, such a cell is sufficient for 30-40 hours of operation. An on/off switch is installed, a red LED flashes when the transmitter is switched on. The transmitters are only offered as open circuit boards as displayed, without housing. They are not weatherproof.

The RED-FOX ARDF transmitters are available in different versions. Currently the 80m transmitter is delivered as Rev. 1. In this version a continuous keying in CW with dots is sent as soon as the device is switched on. It is planned to offer a Rev. 2 later, which then continuously transmits the competition-compliant signals MOE, MOI, MOS, MOH and MO5. The Rev. 2 transmitters are factory programmed to one of these five transmission codes. If you are able to program an AVR controller, you can change it, the firmware is freely available. The transmission frequency is uniformly 3579 kHz.

The ARDF transmitters for 144 MHz are available in five variants, programmed with the signals MOE, MOI, MOS, MOH and MO5. If you are able to program an AVR controller, you can change it, the firmware is freely available. The signals are transmitted continuously, without pause. The transmission frequency is 144.002 MHz. Please indicate variant 1-5 when ordering.

A RED-FOX DF transmitter is included with each of the FoxRex receivers offered above. So you can start practicing right away, or demonstrate the direction finder on a fieldday or during a public event.

Order No.
ARDF-144-1E Transmitter RedFox 2m Band Rev. 2 (144.002 MHz, "E") 30.00 € Add to shopping cart In stock, shipped in 1 to 2 days.
ARDF-144-2I Transmitter RedFox 2m Band Rev. 2 (144.002 MHz, "I") 30.00 € Add to shopping cart In stock, shipped in 1 to 2 days.
ARDF-144-3S Transmitter RedFox 2m Band Rev. 2 (144.002 MHz, "S") 30.00 € Add to shopping cart In stock, shipped in 1 to 2 days.
ARDF-144-4H Transmitter RedFox 2m Band Rev. 2 (144.002 MHz, "H") 30.00 € Add to shopping cart In stock, shipped in 1 to 2 days.
ARDF-144-55 Transmitter RedFox 2m Band Rev. 2 (144.002 MHz, "5") 30.00 € Add to shopping cart In stock, shipped in 1 to 2 days.
ARDF-TX-3500 ARDF Transmitter RedFox 80m Band Rev. 1 (3579 kHz) 20.00 € Add to shopping cart In stock, shipped in 1 to 2 days.
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