LED SWR Tuning Indicator Kit – $20

Available soon

The QRPGuys LED Tuning Indicator is a standalone SWR 50Ω HF bridge that can be used with your existing tuner if it does not have built in SWR indication. It can also be used without a tuner if you are adjusting your antenna for its best resonance. Simply place it between your rig and tuner or antenna and tune or adjust your antenna for the LED to go out.  The device is rated at 10 watts PEP, 5 watts CW max. and incorporates the N7VE LED absorption bridge circuit for sensing SWR. In the TUNE position, you cannot damage your transmitter caused by a high SWR. From a shorted antenna to an open antenna, your transmitter is looking at a maximum of 2:1 SWR in the TUNE position. At full brilliance your SWR is 4:1 or greater, at half brilliance your SWR is approximately 2:1, and the LED will completely extinguish at 1:1. In the “Operate” position RF passes straight through and can stay in the circuit. Both BNC and SMA connectors are provided for you to choose upon assembly.

This kit can be built in an hour or so. On a difficulty scale of 1 to 5, 5 being the most difficult, this is rated at 2.

It is small, compact, lightweight, 1.50″ x 1.25″, and BNC version weighs only 0.8oz., (25gm), the SMA version 0.4oz., (12gm).

Click here for the assembly manual