[Skimmertalk] Monitored Frequencies vs. Displayed Frequencies

W3OA w3oa at roadrunner.com
Mon Feb 2 16:13:28 EST 2009

This points out what, I think, is an advantages of using SoftRock Radios 
with Skimmer.  The local oscillator frequency  and the "Tune at 
Frequency" are specified individually.  So changing the "Tune at 
Frequency" doesn't change the portion of the band Skimmer is decoding 
signals in.

At least I think that's how it works.

73 - Dick, W3OA

skimmertalk-request at contesting.com wrote:
> Message: 1
> Date: Mon, 2 Feb 2009 07:29:05 -0500
> From: "Jeff Maass" <jmaass at k8nd.com>
> Subject: [Skimmertalk] Monitored Frequencies vs. Displayed Frequencies
> To: <skimmertalk at contesting.com>
> Message-ID: <005901c98531$d7913800$020aa8c0 at Maass99>
> Content-Type: text/plain;	charset="us-ascii"
> I am constantly annoyed by the inability to look at sections of the band away from the
> "Tune at Frequency". 
> I'd like to be able to check visually the activity across the monitored bandwidth without
> changing the "Tune at Frequency. The green "bumper stops" as I drag the visual display to
> change frequencies displayed are my least favorite "feature" of CW Skimmer.
> Let me see if all my assumptions are correct.
> My assumptions:
> 0. I use SDR-IQ receivers with CW Skimmer. I have 
>     them set for "96 KHz" sampling rate.
> 1. This is going to sample a bit less than 96 KHz
>     of the band;
> 2. The *center* of the sampled band segment is set
>      in CW Skimmer by setting the "Tune at 
>      Frequency".
> 3. The "Tune at Frequency" also sets the point at
>     which I can listen to a CW signal on the band.
>     If I click on another signal displayed in the
>     ~11 KHz displayed on my screen (may vary with
>     screen resolution), it changes the "Tune at
>     Frequency" to that frequency, and so changes
>     the center of the monitored band segment.
> I would like be able to set the center frequency independent of the frequency range I am
> viewing or the frequency I am listening to. 
> Is this possible? Has anyone proposed this to Alex, or am I just completely off-base in my
> understanding of CW Skimmer and the SDR-IQ receiver?
> BTW, CW Skimmer was **invaluable** at PJ2T during the CQWW 160 CW Contest! Our DSL crashed
> on the first night, and Skimmer (connected to our switchable receive antennas system)
> provided us with several "pop-up multipliers" that we might have otherwise missed. We will
> (likely) be in 3rd Place Multi-op Worldwide (after Africans CN3A and CT9M) when all the
> dust settles.
> 73,  Jeff  K8ND

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