The recent high winds and heavy rain (plus visits to/from friends &
family over the holiday period) resulted in low activity from GW4ALG
over the past month. So I have particularly enjoyed my QSOs this week
with G3YMC; ON7YD; G8PX; and G4GVC.
(The red sky this morning probably means more rain today . . . .)
In an earlier posting, I reported my success with a noise canceller,
based on a design by VK5BR. At that time, I mentioned how I intended to
build a pair of automatically switched cancellers so that the correct
phase/amplitude settings could be set for each of my two receive
antennas. I have now completed this particular project and am delighted
with the results. The degree of attenuation of local electrical noise
has to be heard to be believed - wonderful!
Details of the switched canceller can be found at:
http://www.alg.demon.co.uk/radio/136/noise_can.htm
My next project will be construction of the PA0LQ audio CW filter
(op-amp version), which had been put on hold due to the urgent need to
solve the electrical noise problem.
Regards to all,
Steve GW4ALG
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