On 11/17/2011 12:00 PM,
[hidden email] wrote:
> Date: Wed, 16 Nov 2011 12:14:37 -0600
> From: "Richard Fjeld"<
[hidden email]>
> Subject: [Elecraft] SDR-IF and I/Q questions
> To: "elecraft posting"<
[hidden email]>
> Message-ID:<4844C59175CE4F65BF4D7400354623EB@BIOSTAR>
> Content-Type: text/plain; charset="Windows-1252"
>
> Larry, (Reply to message 12, 16 Nov 2011)
>
> Yes, I have the XG2 generator for portable use, and another gen in a IFR1500 I can use.
>
> I wrote down the test levels when I tested the SoftRock w/Z10,000 but
> I don't remember them. I hope I can find the notes easily.
>
> I found this interesting: ("As the number of signals goes down,
> the required strength of the signals goes up")
As regards WBIR.
> I DO understand the last part of the paragraph,
> but I have a question about this: ("We use -50dBm (S9+23dB) in the
> shop to check out LP-PANs before shipping")
>
> What is the ratio of input to output level? And better yet, what is the input level
> you expect to see from the IF of a radio on average? I'm curious.
I'm not sure which input and output you are referring to. The IF output
of the K3 is about 7dB lower than the antenna input as I recall
(assuming the rig has the buffer mod). The Z10000 can be set for less
loss than that, so that the transfer loss could be reduced to zero. If
you are using the KXV3 and Z10000, you could set the Z10000 gain to
compensate, but it's still going to increase the noise floor. In the
case of LP-PAN, we place a low noise preamp between the KXV3 output and
buffer amp input (the LP-PAN buffer is similar to the Z10000). This
allows lowering the noise floor while still having the high isolation
advantage of the buffer. Jack offers a really low noise preamp that you
could place between the KXV3 and Z10000 to accomplish a similar feat.
Pan signals should roughly match your K3 S-Meter if you calibrated the
K3 against your XG2. I typically see signals at around S9 during the
week, and maybe 20dB higher when the bands are open and crowded on weekends.
Larry N8LP
>
>
> Thanks again,
> Dick, n0ce
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