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Multipath detection

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Posted on February 2, 2020 at 12:14:03
neolith
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I was taking pictures of my TU-919 (getting ready to sell) and got curious about the multipath outputs marked V (vertical) and H (horizontal). I have oscilloscope (Techtronix 2335) and I tried hooking it up with X_Y display but I am not sure what I am looking at. Could someone run through the setup and explanation of the tracings.

I married the perfect woman - the downside is that everything that goes wrong is my fault.

 

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This MIGHT help, posted on February 2, 2020 at 14:47:00
mhardy6647
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see page 34 (scan page 32) of the PDF below. This is a Marantz 10(B) article, but the scope display characteristics are, I believe, generic.

I am still looking for more of a "first principles" description, but I don't have a good reference for you -- yet. :-|


all the best,
mrh

 

another, similar article (Marantz Eighteen Receiver), posted on February 2, 2020 at 15:09:30
mhardy6647
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(from Dec. 1973 Stereo Review via. americanradiohistory (of course!)




See linque below: page 34 of the magazine, scan page 36, :)


all the best,
mrh

 

Here's a link..., posted on February 3, 2020 at 05:00:30
1973shovel
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Location: Greenville SC
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...to a PDF of a Sansui TU-X1 posted on the Tuner Information Center. Scroll to page #20, which shows how to attach a standard oscilloscope to a tuner with outputs, the proper scope settings, and what the display is indicating.

I'm going to assume your TU-919 will be similar.

 

*like*, posted on February 3, 2020 at 14:37:07
mhardy6647
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Heh... I looked at the TU-919 manual. Nada. Thought about checking the TU-X1 but figured it was too esoteric. :)

Well done.

all the best,
mrh

 

Thanks, posted on February 4, 2020 at 07:59:53
1973shovel
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Location: Greenville SC
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I only knew that was in the TU-X1 owners manual because I had answered a similar question here once before, and remembered finding it on the TIC.

Since neolith is selling his TU-919 tuner, it's too bad he doesn't have the owners manual, as I'm betting Sansui included same information in there. Having the manual might help the sale.

 

A TU-919 manual's available on hifiengine, posted on February 4, 2020 at 09:51:23
mhardy6647
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Thought I posted that earlier. :-p

Not nearly as much info on the scope outputs, though, as that TU-X1 documentation. The manual may be incomplete, though(!).

EDIT: fixed the bum link per the post below; sorry about that
all the best,
mrh

 

RE: Multipath detection, posted on February 4, 2020 at 11:05:54
neolith
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Thanks to all. It was fun putzing around with the scope. I found out that multipath was not a real issue on the stations I listened to.

Unfortunately I am leaving the FM world. The local PBS station has gone to pot - the main station no longer carries music and the secondary station is 10 mi further away and the only puts out 1.4 kW. Both suffer from HD Radio self-noise:. In addition, the secondary plays mostly jazz and other genres at night - I prefer classical. And finally I have gotten to old to climb up on the roof to put up an antenna. I am afraid FM is going the way of 8-track, tape cassettes, and CD. Music sources seem to be driven (no pun intended) by the automobile. Vinyl is an anomaly. HD-FM might be viable but as it is the audio quality sucks and offers no advantages over streaming.

I married the perfect woman - the downside is that everything that goes wrong is my fault.

 

Have you got a manual for these?, posted on February 5, 2020 at 11:56:46
1973shovel
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That's where your link went.

 

derp -- those were for another thread here at AA :), posted on February 6, 2020 at 05:23:52
mhardy6647
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You can find the AU-919 link yourself ;)
At any rate, I fixed the link in the post. Sorry about that.

It coulda been worse, right?
all the best,
mrh

 

I should'a used a smiley face thing, posted on February 9, 2020 at 03:34:25
1973shovel
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Posts: 9190
Location: Greenville SC
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...because I was just joking. I'm assuming the tools were meant for that guy who couldn't get the lid off his power conditioner, yes?

I always enjoy your posts, thanks!

 

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