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What is Passband Tuning?

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January 21st 04, 03:49 AM

matt weber

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On 21 Jan 2004 02:51:28 GMT, (BCcubed) wrote:

Hello,

I read in a post the new Eton has passband tuning, what does that mean?

Thanks,

Neil
Traditionally filtering is done after the last IF, and just before
detection. The 'Native' IF strip is often relatively broad banded,
6-10Khz. Passband tuning allows you to 'center' the filter anywhere
within that 6-10Khz. So without chaning the tuning, you can move for
example an 2.1Khz SSB filter anywhere within the passband.

the disadvantage of passband tuning is you can get 'blocking'. Signal
levels, which drive AGC are effective measured in front of the filter.
Ergo a strong signal in the passband, but outside the filter can
driver gain down on the signal you want to hear.

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