I recall building a
little noise bridge, based on the 555 timer chip as I recall,
for the same purpose. Worked well until one day I forgot to
disconnect it before transmitting. I rebuilt it, intending to
incorporate it into my homebrew atu? but never got back to
that project.
As I recall that
would have been back in about 1979 and the original design
came from an ARRL Handbook from around that time.
Bill, VK7MX
On 11/05/2018 8:11 AM, William Cullison
wrote:
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Kees,
I'm fairly new to the BITX group and never heard of his idea.
Thanks for bringing it up again. I have always listened to the
background noise to do my rough tune but like the idea.
73 Bill WA8VIH/4
