LED SWR Tuning Indicator – $25
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. It has a male BNC input for direct connection to your radio without adapters and a female output connector for coax to your tuner or antenna. The board is also laid out to accept user provided SMA pcb connections.
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 weighs only 23g. (.8oz.)