AFAIK rejecting multi-path is a phase issue so capture ratio isn't much of a help

Posted by Timbo in Oz (A) on December 29, 2011 at 01:42:28

In Reply to: RE: " No tuner made can reject multipath." Discuss? posted by hahax@verizon.net on December 28, 2011 at 21:42:02:

Or, and in the same sense, a time of arrival issue.

Further, for capture ratio to help if it can at all, the direct signal has to be very strong compared to the reflected signals, and only when the reflected signals are considerably weaker than the main signal.

This certainly doesn't apply where I live, The level of the combined reflected signals exceeds the level of the direct signal. It must do because to either side of the known LOSight the signal towards each of the two large hills on either side is just as strong as the direct signal, off a directional antenna. So 3db higher in combination, IF I was using an omni, or a single dipole.

So with an Omni like a whip, what IS the main signal? the strongest!? WE can see now that that will not necessarily be the cleanest.

If the strongest signal is always best, which would need to be true for capture ratio to be a reliable indicator of the MP rejection capability of a tuner, why then do some MFRs add MP indicators?

So, MP is the thing you want to minimise, along with maximising signal strength with low MP. Again, this argues for a directional antenna with considerable gain, and ideally a multipath indicator on the tuner.

Because I listen to real stereo recordings a lot I can hear multipath quite easily on live acoustic broadcasts miked in real stereo. A correctly oriented directional antenna maximises 3D, nuance, interplay and expression.

Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger

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Follow Ups Full Thread

Topic - " No tuner made can reject multipath." Discuss? - Timbo in Oz 16:41:31 12/28/11 (16)

RE: " No tuner made can reject multipath." Discuss? - stellavox 06:10:42 01/04/12 (0)

You're correct Tim..... - kootenay 00:29:47 01/04/12 (2)

RE: You're correct Tim..... - Brian Levy 12:41:08 01/30/12 (0)

If signal is strong 'cos it came from a directional antenna it 's unlikely to have much multipath content - Timbo in Oz 00:40:05 01/04/12 (0)

A most interesting thread. Thanks! (nt) - 1973shovel 10:24:34 01/01/12 (0)

Maybe no 'consumer' tuner... - AbeCollins 19:41:05 12/31/11 (1)

SDR? Yes I have heard about it. - Timbo in Oz 16:43:51 01/01/12 (0)

I'm going to agree - Awe-d-o-file 09:16:52 12/31/11 (0)

RE: " No tuner made can reject multipath." Discuss? - centaurfm 14:37:41 12/30/11 (2)

Hybrid Digital is very lossy digital, it isn't high definition by any assessment. - Timbo in Oz 16:24:02 12/30/11 (1)

Further digital RF either works or it doesn't, cell-phones and all else! - Timbo in Oz 01:07:08 01/04/12 (0)

RE: " No tuner made can reject multipath." Discuss? - Neff 11:37:43 12/29/11 (0)

RE: " No tuner made can reject multipath." Discuss? - hahax@verizon.net 21:42:02 12/28/11 (3)

AFAIK rejecting multi-path is a phase issue so capture ratio isn't much of a help - Timbo in Oz 01:42:28 12/29/11 (2)

Capture ratio is certainly relevant in reducing multipath - AbeCollins 13:00:23 12/31/11 (1)

It is my experience that a directional antenna with gain always sounds better than anything else - Timbo in Oz 01:03:55 01/04/12 (0)

Follow Ups

AFAIK rejecting multi-path is a phase issue so capture ratio isn't much of a help - Timbo in Oz 01:42:28 12/29/11 (2)

Capture ratio is certainly relevant in reducing multipath - AbeCollins 13:00:23 12/31/11 (1)

It is my experience that a directional antenna with gain always sounds better than anything else - Timbo in Oz 01:03:55 01/04/12 (0)

AFAIK rejecting multi-path is a phase issue so capture ratio isn't much of a help

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