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Universal 80 meter ARDF transmitter

This high power, high efficiency 80 meter transmitter can be used for Amateur Radio Direction Finding (ARDF), sometimes also called 'fox hunting' (Dutch: 'vossejagen'). By adding some control logic, an antenna system and a battery, this transmitter will become part of an ARDF event.

This ARDF transmitter was designed and built for the Dutch 'Piet Wakker jacht' (named after the late Piet Wakker PA0PWA). These transmitters are used in most of the 'Piet Wakker' ARDF events in The Netherlands.

EMCO 80 meter ARDF transmitter EMCO 80 meter ARDF transmitter



Output power: 37 dBm / 5 W
Output impedance: 50 Ohm unbalanced
Frequency: 3.5795 MHz
Harmonic suppression: More than 48 dB (see figure below)
Power supply: 12 VDC (8 - 13.8 VDC)
Current consumption idle: 3.4 mA @ 12 VDC
Current consumption standby: 6.3 mA @ 12 VDC
Current consumption TX: 580 mA @ 12 VDC
CW in: 5 V TTL
5 VDC-output: Max. 100 mA
PCB width x height: 90 x 95 mm
Mounting: 4 x 3 mm holes
Output spectrum of transmitter (@ 12 VDC):

EMCO Portable Repeater Controller PCB front

Licence requirements

Please check your local amateur radio regulations if a licence is required to use this transmitter.

Connection diagram

EMCO Portable Repeater Controller system example


Manual with connections and functionality.

Part Numbers and Prices

Part Number Name Price [Euro]
ARDF-TX-1 80 meter ARDF transmitter 97.50

Additional information about these part numbers:

Detailed PCB view

EMCO 80 meter ARDF transmitter
Front view of 80 meter ARDF transmitter (ARDF-TX-1)

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