600 ohm 1:1 audio isolation transformers for datamodes: PSK31, WSJT, RTTY, Echolink, ILRP etc.

Thousands of happy customers worldwide!



A pair of two high quality telecom grade transformers ideal for building your own datamodes interface to connect your computer's sound card to your transceiver.

Great for packet, PSK31, RTTY, WSJT, WSPR, Olivia, CW, echolink, IRLP, SSTV any many other modes. Also useful for off-air recording and playback.

Provides electrical isolation between the radio and the computer, helping to eliminate hum loops, RF interference and reduce the risk of damage due to earth currents.

1:1 ratio and 600 ohm impedance for easy integration into many of the designs available on the web.


  • Dimensions: 14.5mm long x 12.5mm wide x 12mm high
  • Terminations: Soft wire for through-hole mounting
  • Frequency response: 300Hz to 3kHz minimum

We sell 6 pin mini DIN audio breakout cables to fit many transceivers and many other interesting items, please visit our eBay shop.

Fair postage. Proof of posting obtained for all shipments. No packing charges. Orders received before 3 p.m. are normally posted on the same day (Mon-Fri).

Money back guarantee. If you are unhappy with your purchase in any way, simply return it within 60 days for a refund.


Copyright © 2014 TechnoFix UK. The text and pictures in this listing are our own original work. Copying is against eBay rules and will not be tolerated.