Posted by
Buck - k4ia on
Mar 16, 2009; 4:15pm
URL: http://elecraft.85.s1.nabble.com/Hot-K3-tp2483931p2487026.html
Yes, it is a "hot" receiver. I usually have the RF gain turned to about 50%
- just a little above the band noise. You can be more aggressive on PSK and
weak signal CW as it is possible to copy signals below (but not much below)
the band noise.
Also, the K3 was designed to have excellent dynamic range and if you ride
the RF gain too high, you are wasting some of that headroom.
Buck
k4ia
K3 #101
In a message dated 3/16/2009 11:57:22 A.M. Eastern Daylight Time,
[hidden email] writes:
Don:
I had the same reaction upon first using my new K3 last year. The K3 is
significantly more sensitive than my previous rig (IC-756 non-Pro), and as
my noise environment is fairly high (inner suburb with ~110 dBm background
noise), at first it seemed as if the K3 is fairly noisy. Also, while the S
meter of most rigs are calibrated fairly well at S9, their meters are not
linear (in dB units) at lower S unit readings (the K3 meter is very linear
at 6 dB per S unit)-- with the result that the K3 meter readings are higher
by a few S units.
I find that I often use the attenuator and/or the RF gain to decrease the
band noise in the K3 -- I rarely used these in my other rigs. Also, try
playing with the AGC settings, particularly the THR and SLP settings, which
can be customized to suit your operating conditions. Also, turning off the
AGC and riding the RF gain can really help pull out very weak signals.
Steve N9SZ
Don Rasmussen wrote:
"My new K3 #2308 shows two to three S-units high as compared to my other HF
radios, \
and lots of hiss in the speaker audio at low AF levels."
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