On May 25, 2008, at 7:57 AM, Charles Harpole wrote:
So many msg abt K3 and FM..... I sit puzzled.... why in the world
would one bother to wait and
buy a K3 JUST TO RUN FM??? The K3 is a CW radio..... pure and
simple, and the other modes
are just thrown in.... My point is why waste a great K3 on
something virtually any radio today
can do well....FM !!??!! That is, no use for vy narrow filtering
in K3 on FM, nor many of its other
features... and there are rcvrs more sensitive if u must have
that..... Sign me puzzled.... 73
The K3 is a great receiver for whatever mode. One problem I have
always had to contend with in FM is desense from a strong in-band
signal. I would hope that would not be a problem with the K3 as it is
with most purpose-built 'FM' receivers.
If you think about it, the receiver is a linear translator. It takes a
signal at a high frequency and it translates it to a very low
frequency while preserving the time, amplitude, and frequency
relationship between spectral lines in the passband. In the case of
SSB it translates it to baseband where the ear detects it. In the case
of CW it translates it to a very low (AF) frequency where the ear
again acts as a detector. In the case of digital modes like FM, PSK,
MFSK, RTTY, PACTOR, etc., it translates the signal to a very low IF
(about 1.5KHz) where it is detected by hardware operating there. The
point is that, while the end-function is different, the mode of
operation is similar. The receiver is a linear translator to either
baseband or very low IF.
--
73 de Brian, WB6RQN
Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com
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