On 4/17/2020 4:19 PM, Roger Kennedy wrote:
> $180 for a receiver filter? That's absurd !
That depends on the design criteria. I don't know how it is in your part
of the world, but folks here who design and build stuff like to get paid
a living wage. A filter that passes 160M but strongly attenuates 1710
kHz (sidebands of 1700 kHz) is not a simple one. It requires a very good
design and precision components, careful manufacturing, and precision
alignment.
(By the way, if you now have stations broadcasting between 1.6 and 1.7 MHz,
how does anyone pick them up? I don't know any broadcast radios that go
above 1.6 !)
This is one of those frequency allocations that varies by region. In NA,
the AM band, stations are assigned carrier frequencies from 540 to 1700
kHz, and radios sold here are programmed for that coverage. This
allocation has been in effect for several decades. By contrast, we have
no LF broadcasting.
73, Jim K9YC
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