Thank you Joe for the best wishes, I send all my best wishes to all at
Elecraft and all owners of K1, K2 & K3s. Season Greetings and may 2009
bring you all that you desire.
73 de Barry G4DBS
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Today's Topics:
1. Re: K3 and noise (David Woolley)
2. K3 on VLF (David Pratt)
3. Re: K3 Firmware Rev. 2.76: No AF noise burst; PRE/ATTN
independent for sub RX; etc. (Stewart Baker)
4. Re: 6 meters (Brendan Minish)
5. Re: Proper Heil Microphone Adapter? (Dick Roth, KA1OZ)
6. Re: Proper Heil Microphone Adapter? (Don Wilhelm)
7. RE: saving RX EQ per mode (Ignacy)
8. Re: 50 and 100 DSP positions (Ignacy)
9. K3 QRP output power level (Richard Haendel)
10. Request (Ignacy)
11. RE: 6 Meters (Dave Agsten)
12. RE: Walwart power? (list1)
13. RE: K3 QRP output power level (Dick Dievendorff)
14. OT - Holiday wishes (Joe Stofko)
15. K3 Subreceiver ANT selection doesn't work - always uses the
AUX antenna (Frank R. Oppedijk)
16. Re: Christmas 2008 (Robert C.Abell)
17. Re: K3 QRP output power level (Don Wilhelm)
18. Thank you! (Phil LaMarche)
19. happy holidays (DOUGLAS ZWIEBEL)
20. Re: K3 Subreceiver ANT selection doesn't work - always uses
the AUX antenna (Barry N1EU)
21. Re: K3 Subreceiver ANT selection doesn't work - always uses
the AUX antenna (Barry N1EU)
22. Re: happy holidays (Jan Erik Holm)
23. Re: Walwart power? (rkayakr)
24. Re: happy holidays (Dave Yarnes)
25. RE: K3 Subreceiver ANT selection doesn't work - always uses
the AUX antenna (Bruce McLaughlin)
26. RE: K3 Subreceiver ANT selection doesn't work - always uses
the AUX antenna (Bruce McLaughlin)
27. A K3 Variation of SKN (Dave Yarnes)
28. Re: A K3 Variation of SKN (David Pratt)
29. A K3 Variation of SKN (Tom Hammond)
30. Re: happy holidays (Vic Rosenthal [TSI])
31. Re: K3 Subreceiver ANT selection doesn't work - always uses
the AUX antenna (Frank R. Oppedijk)
32. RE: Proper Heil Microphone Adapter? (Jeff Maass)
33. Re: Thank you! (Jim Brown)
34. Re: K3 Subreceiver ANT selection doesn't work - always uses
the AUX antenna (Barry N1EU)
35. RE: saving RX EQ per mode (NZ0T)
36. Re: saving RX EQ per mode (Iain MacDonnell - N6ML)
37. A K3 Variation of SKN (Jim W7RY)
38. happy holidays to Wayne and Eric and tnx for the K3 (O. Johns)
39. Jack on bottom of K3? (David F. Reed)
40. RE: Jack on bottom of K3? (Ron D'Eau Claire)
41. Re: A K3 Variation of SKN (WILLIS COOKE)
42. Re: K3 SSB Contour Filter (reduce total bandwidth)
(Joe Subich, W4TV)
43. Looking for an Elecraft BL2 balun (NZ8J)
44. RE: saving RX EQ per mode (NZ0T)
45. Re: K3 Subreceiver ANT selection doesn't work - always uses
the AUX antenna (WILLIS COOKE)
46. K3 Utility version 1.1.12.22 now available on Elecraft web
site (Dick Dievendorff)
47. Happy Holidays (Ken Kopp)
48. K3: Automated Transmit Gain Calibration at 5 W, 50 W, and 1
mW (wayne burdick)
49. K3 Firmware Download Utility (Doug Joyce)
50. RE: K3 Firmware Download Utility (Bill Johnson)
----------------------------------------------------------------------
Message: 1
Date: Wed, 24 Dec 2008 09:31:01 +0000
From: David Woolley <[email protected]>
Subject: Re: [Elecraft] K3 and noise
To: Elecraft <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Ron Kenwood wrote:
I have a continuous S7 to S8 noise level at normal SSB bandwidths. If
I had to describe the noise, I would say it sounds like amplified
background band noise. The source is outside my house. Removing the
If the noise is close to gaussian, there is nothing any receiver noise
reduction system can do with it, to actually remove it, although it can
do things like muting the receiver in gaps in the speech, if the speech
is above the noise, or generating a graphic equaliser that de-emphasises
frequency not also being used for the speech.
I have read glowing reports on the effectiveness of the noise blanker,
here and elsewhere. I am wondering if the type of noise is part of the
Noise blankers require that the noise be isolated spikes that can be cut
out without removing too much of the signal.
equation, and I just have a type of noise where the noise blanker is
less effective, or am I doing something wrong, or do I just have
unreasonable expectations?
Knowing the source of the noise might help, as it might give a clue as
to its structure and therefore whether there is anything that can be
done to mitigate it.
My next step will be one of the noise canceling gadgets, if I can't
improve the K3's noise performance.
For gaussian noise, the best option is to eliminate it at source.
Failing that, put it in a null in the antenna pattern will help,
providing the noise has a well defined direction. I assume you are
referring to the sort of noise cancelling device that works by
distorting the antenna pattern.
Note that such devices are not suitable when the antenna is already very
directional, or the sky noise is not significantly greater than the
receiver noise (the device is likely to contribute its own receiver noise).
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