18 Sept 2017

WISPY on 10m WSPR

Some years ago I designed and used this very low cost rig as a beacon on 10m WSPR. Even the crystal is low cost. With 10m in decline, this is an ideal time to try 10m WSPR. More power can be had by adding more low cost transistors in the PA. 2N3904s are very inexpensive.

See https://sites.google.com/site/g3xbmqrp3/hf/wispytx
at

2 comments:

  1. HughMon Sept 18, 09:45:00 am GMT+1

    The design seems to generate double-sidebands, one correct, and one image (no filtering). Is my understanding correct? Thanks, G6AIG

    ReplyDelete
  2. Roger G3XBMTue Sept 19, 12:55:00 am GMT+1

    Yes DSB, so one sideband is wasted.

    ReplyDelete