Pages

▼

18 February, 2023

QDX Twins 80-10 m

My QDX twins from QRPLabs: 

  1. On top, the high-band version, 20-10 m, with a revision 4 PCB
  2. In the bottom, the original 80-20 m version with a revision 3a PCB
Both have been assembled for 9 Volts operation nominally.

My wife and I have identical twins in real life and at times one of the ways to distinguish between them was by different colors. Here it is the same, so the high-band QDX has a yellow LED and the low-band one has a green LED.
at

2 comments:

  1. Nate, N8BTR31 October, 2024 14:31

    I know the LED is 3mm... any insight on current and voltage requirements? As I build more QDXs, I'm running into the same issue of how to differentiate them!

    ReplyDelete
  2. Sverre Holm31 October, 2024 18:50

    I just found some LEDs in my junk box without checking current specs. I may have changed the 470 ohm series resistor (R33), in order to adjust brightness, but actually I don't remember doing so.

    ReplyDelete