[Lowfer] The Haunted HiFER

[JD]

Out at the farm this afternoon, I saw... the ghost of NC !

Tuned it in with very little difficulty, as is normally the case, but this 
time I had Argo set with 13555.562 nearer the top of the Argo display than 
usual.  To my astonishment, I realized I was seeing it two places.  An 
eerie, ghostly copy of the squarewave was visible at 13555.502!

I puzzled over that a while, trying various minor adjustments of RF level, 
Argo's sensitivity control, and IF bandwidth, trying to obtain a clue. 
Finally, the frequency separation of the two signals sunk in on me.  You 
don't suppose....

So, I cranked Argo up in frequency and voila!--an eerie, ghostly squarewave 
at 13555.622 kHz as well.  "Hmm," I said to myself; or perhaps, "hum."  A 
bit of 60 Hz ripple sneaking through the regulator?  Took a snapsot of the 
upper sideband, and then went back down and did the same for the lower one. 
Wish I'd kept the capture of the first instance of the lower sideband, 
because it was clearer than the one attached.  (The receiver was still 
warming up at that time, and could have been as much a couple of Hertz off 
at 22 meters right then.)

John
-------------- next part --------------
A non-text attachment was scrubbed...
Name: haunted-hifer.JPG
Type: image/jpeg
Size: 28646 bytes
Desc: not available
Url : http://mailman.qth.net/pipermail/lowfer/attachments/20110325/bfcab09b/attachment.jpe