[Elecraft] Re: Elecraft Digest, Vol 56, Issue 39
Barry Middleton
bajubranston at ntlworld.com
Thu Dec 25 05:53:30 EST 2008
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 <forums at david-woolley.me.uk>
> Subject: Re: [Elecraft] K3 and noise
> To: Elecraft <elecraft at mailman.qth.net>
> Message-ID: <49520155.3040900 at david-woolley.me.uk>
> 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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