Shared Projects by K6ARK

This little device allows amateur radio operators to easily record mic and rig audio to separate channels of a 2-channel (stereo) audio recorder. Connect rig input via a 3.5mm TRS AUX cable which will be attenuated and provided to the recorder via another AUX cable on one stereo audio channel. Plug in a lavaliere mic to the mic input to record you talking. And plug in headphones to get binaural audio from the rig to your ears.

PARTS:

(Amazon Affiliate links)

• 1x TRRS jack: (10 pack) https://amzn.to/3I4KBJj

• 3x TRS jacks: (20 pack) https://amzn.to/3I7IKmZ

• 1x cheap TRRS lavalier mic: (2 pack) https://amzn.to/3Nvvslr

• 1x 470 ohm and 1x 2k ohm 0603 resistor: https://amzn.to/3nzKrQE for a kit, or individual components from Digikey or Mouser.

• 2x Male to Male 3.5mm audio cables: https://amzn.to/3QTRPUy

• 2-channel/stereo audio recorder: https://amzn.to/3IcCc6U is the one I use. Other options are out there - just make sure it’s “stereo.”

ASSEMBLY:

Install resistors.

Install connectors on resistor side of the board OPPOSITE the silkscreen labels.

TO USE:

Plug the devices into the labeled ports. Hit “record” and git ‘ur dun.

Provides 20 dB of attentuation to condition line level audio to and from the (tr)uSDX to prevent overload and distortion of signal in digital mode operation.

Assemble the adapter, and plug into (tr)uSDX with resistors facing down. Note board labels for each plug. Insert a TRRS cable into the adapter. Connect audio cable to computer or phone TRRS combo jack, or to headphone and mic jack using a splitter. Set (tr)uSDX volume to 10. Set computer/phone audio volume level to 100%. To trigger PTT on transmit, either set up CAT control or use VOX mode.

ASSEMBLY:

• Solder resistors in labeled positions on board and trim leads.

• Solder TRRS 4 pin jack onto board.

• Install TRS plugs into radio sockets with solder pins pointing up.

• Place board onto TRS plug solder pins with resistors facing down. Solder into place.

PARTS LIST:

2ea. TRS Pins Plugs: https://www.digikey.com/en/products/detail/tensility-international-corp/54-00036/5609421

2 ea. 10k ohm 1/8w resistors: https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF18JT10K0/1741566

2 ea. 1k ohm 1/8w resistors: https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF18JT1K00/1741612 (Or equivalent through hole resistors)

1 ea. 3.5mm 4 pin jack: https://amzn.to/3NtxQJv (Amazon affiliate link)

1 ea. TRRS cable: https://amzn.to/3NpYUt5 (Amazon affiliate link)

Optional: 1 ea. TRRS to dual TRS splitter: https://amzn.to/3xZaCFw (Amazon affiliate link)