Posted by
P.B. Christensen on
Dec 17, 2009; 3:22pm
URL: http://elecraft.85.s1.nabble.com/Noisy-K-3-Receiver-tp4173832p4181776.html
If it's weak signal work where this is being noticed, one test of the
overall noise floor is to run the headphone output from several rigs,
individually switched into a PC sound card with a FFT software program
running. The AF outputs would require normalizing at various
signal-strength levels across receivers with say a 1 kHz tone for wider
bandwidths and perhaps 500 Hz tone for narrower modes. For SSB, 1 kHz
should represent an area of the IF and AF passband where minimal attenuation
occurs for any receiver. Even if the IF selectivity is not identical across
the receivers, the FFT software will still produce some meaningful results.
The test should include AGC on and AGC off settings.
Paul, W9AC
----- Original Message -----
From: "Jim McCook" <
[hidden email]>
To: <
[hidden email]>
Sent: Thursday, December 17, 2009 10:06 AM
Subject: Re: [Elecraft] Noisy K-3 Receiver
> Juergen and others.....
>
> I'm glad to see this thread get so much attention; it's about time this
> issue was brought into focus. In spite of my huge appreciation for this
> radio, I find it to be very noisy and fatiguing to listen to, especially
> with weak signals.
>
> I have, like others, tried all the adjustments mentioned, but with no
> real improvement. I can switch to my FT-1000D for relief when this gets
> to the point of being difficult. I find myself doing this more and more
> often. I used the K-3 in CQWW SSB and CW, and enjoyed the great
> features and ease of use, especially using the N1MM settings to access
> the KDVR audio during the SSB contest. But... all these great features
> have come at some cost.... dealing with the receiver noise. Even the EQ
> settings are a tradeoff because the noise follows boost in the low range
> for CW (I listen at 350hz). We still need separate EQ settings for SSB,
> too.
>
> I'm also wondering if the DSP board upgrade for low range will help to
> solve some of this problem....
>
> The RX MIX audio arrangement in the FT-1000D is still far superior to
> the K-3, also. The newest options for this helped, but the Yaesu is
> still better in dual receiving mode with the balance control.
>
> Jim
> W6YA
>
>
>
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