[Elecraft] 160M low sensitivity problem?

Wed Jan 2 16:26:46 2002

Dave:

I no longer have PC boards available for the noise source, BUT it's 
apple-pie simple to build using just about ANY assembly technique you might 
wish to use... excluding dropping blobs of solder from a height of 6', that is!

For an idea of a possible building format, take a gander at how N0RC built 
his using Manhattan-style construction:

    http://www.radioactivehams.com/~n0rc/noise_gen/noise_gen.html

Note the the component values are pretty flexible... esp. the zener 
diode... anything between 5.2Vz and 6.8Vz should work great.

If you might have any questions, just shout?

73 - Tom Hammond   N0SS

At 11:01 AM 1/2/02, Timothy A. Raymer wrote:
>Dave,
>
>A broad band noise generator may be the best thing to give you a 
>quantifiable amount of noise to judge against.  Tom, N0SS, has constructed 
>one that the Arizona Scorpions had as a kit for a while.  I think they ran 
>out, but Tom may have boards or documentation available.
>
>That will give you a source of noise that is uniform in terms of strength 
>across a wide range of frequencies, and will allow you to do more accurate 
>comparisons.
>
>Tim Raymer
>73 de KA0OUV
>At 15:14 12/31/2001 -0500, David A. Belsley wrote:
>>Dave:
>>  I guess there is a bit of difference in the noise between 80 and 160 ...
>
>
>
>>I've been playing around re-aligning my K2 after adding the version 2
>>>upgrade tonight [2 nights ago, now].  Using Spectrogram, I noticed
>>>something I've suspected with the 160M module I added quite a while back.
>>>(I haven't operated any 160 with the K2, yet).   If I have no antenna on
>>>the K2, and am receiving just noise on 80M, and set the peak of the
>>>waveform to -40db, then switch to 160M, the waveform drops at least 5 db
>>>on the Spectrogram screen (preamp on in both cases) -- this drop is quite
>>>noticeable to the ear.  Is this normal?
>
>
>
>Timothy A. Raymer               <[email protected]>
>Missouri Department of Health   <[email protected]>
>and Senior Services
>
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