I have always done the same thing with signals at the noise floor, or below.
The biggest change I've noticed by doing this is the band noise is much more
attenuated through the headphones lying on the table and the signal one is
trying to copy jumps out in the clear since band noise is attenuate
Interesting point ... Right after getting the new synth for my K3, I was
copying a number of WSPR stations on 630 meters. I even got up in the
middle of the night to see if I could hear them [I couldn't] as the
computer copied them at - 10 to -15 dB SNR. At first consideration, I
don't see wh
This test may be a bit out of date.
With digital modes decoding signals ~10 db below the noise these days,
one may need at least two S-units of noise.
73 de Brian/K3KO
On 10/14/2016 0:04 AM, Fred Jensen wrote:
Re #3: I never have either. While a thorough analysis of "To Preamp or
Not to Pre
Re #3: I never have either. While a thorough analysis of "To Preamp or
Not to Preamp" is complex and very situational, the antenna check is
really a very good indicator:
Remove the antenna and note the noise produced by the K3. Connect the
antenna. If the noise rises, adding a preamp at the
1. Is your PREamp turned on for 10m? Hopefully you don't accidentally have
RX ANT activated.
2. Please describe your antenna in more detail, including orientation.
3. I've never needed a preamp on 10m in the 8 years I've had a K3, but my
antenna system has a lot of gain.
73, Bill W4ZV
-
How old is the K3? I bought the PR6-10 from a ham who was upgrading
to the KXV3B. It made my K3 (SN 4340) circa 2010 much better on 10m
and 6m. I even copied some 6m-eme* signals with the PR6-10 using my
6-element yagi in August of 2015.
I now have a 6m GasFet preamp at tower top and it is
I think Bill's right, but if your QTH is reasonably quiet, you DO need a
preamp on 12, 10, and 6M for the original K3. The outboard preamp for
the K3 solved that problem, but the new preamp that's part of the KXV3B
module does it even better. I've upgraded my K3s to the new KXV3B, and
am very h
If you are hearing static, then you have enough sensitivity. It
sounds like the problem may be a very local source of noise
which is drowning out the signals at your QTH, while your friend
is far enough away from that source to not be bothered by it.
Try using a portable radio to search for the
Gerald,
The K3's original preamp provides an MDS of about -135 to -136 dBm on 10 and 6
meters. This should suffice unless you have an extremely low noise floor. If
you do, then you can install the KXV3B option, which has a second preamp that
has a much better MDS -- around -144 to -145 dBm.
T
I am curious why a fellow ham and I who both live within two blocks of each
other and have the same wire antenna, Except mine is a little higher. I have
the K3 and he has a Kenwood and Yaesu and he is working people on 10 meters
while I can only hear static. The same goes for 6 meters. I think I ha
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