I currently live in a city of average size but quite industrialized.
Also very close, about 1km (3 miles), a AM broadcast station 882khz with
10kw.
My currently rig is an IC-756PRO3, and noise in 80 and 160m is 9/9 +10.
To RX, I use a loop (kc2tx) plus a preamplifier (w7iuv) and a bandpass
filter.
I'm thinking of changing my actual rig and acquire one that is more immune
to city noise and intermodulation of BCB.
My first choice is a K3, but first I would like to ask a question ...
Will I get to improve my reception (on low bands) with this rig ?
Jose,
You will get many answers because of how different systems behave.
A receiver with wider selectivity before the noise blanker will always blank
noise better. This is because of the wide bandwidth of noise, and the very
narrow bandwidth of signals. A wide system ahead of the blanker has a
sharper and more profound sample of the noise, and the wide noise sample is
not influenced or covered by the narrow signal.
A narrow filter ahead of noise reduction makes noise power and signal power
closer, and makes waveshapes of noise and signals closer.
The best overall noise reduction systems have the widest response at and in
front of the blanking system.
If someone is limited by close-spaced signals, then a narrow filter near the
front end works best. A city location has few problems with close-spaced
in-band signals, and has more problems with wide bandwidth noise.
A city location is not the best place to show off a K3.
Someplace like I have, where I have to listen through strong east coast
signals and I have no local noise, is far better with a receiver scheme like
the K3. In the city almost anything will work, and you might even do better
with a wider filter ahead of any noise reduction.
None of us can tell others which will be best when the results are depend on
local conditions, unless we have the same situation.
73 Tom
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Topband Reflector
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