Gregory
Sent: Tuesday, March 19, 2013 9:45 PM
To: Ron D'Eau Claire
Cc: Elecraft List
Subject: Re: [Elecraft] [K3] RX Gain Calibration
Exactly
Gary
Vk1ZZ
K3, KX3, KPA500-FT, KAT500-FT,P3.
On 20/03/2013 11:59 AM, Ron D'Eau Claire r...@cobi.biz wrote:
Sometimes I truly believe that one of the worst
If he was DX, I'll bet he was 59.
--- On Wed, 3/20/13, Fred Smith m...@mo-net.com wrote:
Amen! I have worked stations SSB that never move the S-Meter at all.
73,
Fred/N0AZZ
K3 Ser #'s 6730/5299--KX3 # 2573--K2/100--KAT100
P3/SVGA--KPA500--KAT500--W2
Exactly
Gary
Vk1ZZ
K3, KX3, KPA500-FT,
This discussion prompts me to make the comparisons on my K3 (4340)
and KX3 (475). I have an XG3 which I have installed in a diecast
aluminum box (Hammond Box) so it is able to produce signals down to
-155 dBm using external attenuators and double-shielded coax cables.
I calibrate the XG3 at
Travis I was in your same situation and understand what your experiencing.
I got my KX3 first and was blown away by how quiet and sensitive it was.
The KX3 was so impressive I sold my entire Ten-Ten station and built a K3.
I was disappointed that the K3 receiver didn't seem to be as good as the
Thanks Stan. I ordered a XG3 yesterday and I hope to have it here this
week. I wasn't expecting such a huge discrepancy between the KX3 and K3,
and it really surprised me. If I figure out the secret sauce, I'll
definitely let you know. I am curious, with did you put the KX3 and K3 on
the XG3
Travis,
The real measure of any receiver in the ability to hear weak signals is
not in the S-meter deflection. Within limits both the K3 and KX3
S-meters can be calibrated to read most anything you want to see.
The measurement of actual sensitivity is in the MDS measurement. That
indicates
Hi Don,
I agree 100%! The S-Meter isn't as big of a concern to me as the fact that
the noise floor seems to be so much more prevalent on the K3 than the KX3. I do
understand that the more sensitive receiver will dip deeper into the noise
floor and you will hear more of it. If I always have
Travis,
The S-meter should not indicate anything with the antenna disconnected.
You should be searching for the reason the AGC is being activated on
receiver noise - or it could be S-meter calibration. The XG3 can allow
you to properly calibrate the S-meter - the Utility program will guide
Sometimes I truly believe that one of the worst plagues imposed on the Hams
of the world was the S-Meter.
In short, it means little about whether you can hear a signal or how easily
it can be copied.
True signal reports are given by what you hear, not what the meter says.
73 Ron AC7AC
All,
I put together a K3 kit about 6 weeks ago. Wow, that was an amazing
project. Many thanks to Elecraft for making that option available. The
problem I am having is that on 180/80/75/40 and sometimes 20, the noise
floor is about S7-9. It is about the same on both my antennas (OCF dipole
and
Travis,
I doubt the RX gain calibration will make that much difference, but
rather I suggest that some alteration of the AGC parameters will make
the most difference for you. Take a look at the Noisy K3 article on
my website www.w3fpr.com for some guidance in adjusting your settings.
That
Thanks Don.
I will definitely tweak the AGC settings. Someone else recommended that
too. However, I thought the KX3 and K3 had basically the same receiver, and
if I hook the KX3 up to the same antenna that to which my K3 was connected,
the S-meter should report the same values regardless of the
Travis,
The KX3 is a direct to baseband receiver with the DSP being done at
baseband (or if RX shift is on at 8 kHz.) while the K3 downconverts to
the 8 MHz IF before digitizing and sending the data to the DSP.
So the two receiver architectures are different.
73,
Don W3FPR
On 3/18/2013
Travis, that's interesting that the KX3 was quiet. Sometimes I think the k3 is
just too sensitive. I don't know if that's it or not. I've certainly wondered.
Please share if you find the secret sauce.
73
Mike R
Play me some fiddle, but no stinkin' violin!
Amateur/Ham Radio KE5GBC
HF
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