Help! Is My new Kenwood KT-917 working OK?

[Kuja]

Hi all!

My new Kenwood KT-917 tuner has finally arrived.

It is in near mint condition and seems to works flawlessly.

I got no user manual, so I have this question:

There is this DDL LED signal lamp (it is located right above the 102 MHz mark on the tuning scale - see picture).

What is DDL? On this picture found on the net, it is lit up.
There is no button on the tuner that controls it.

I tuned to all available stations, but couldn't get this DDL LED to be in the "operate" status...

Is my tuner ok? Everything else works perfectly.

Thanks in advance,

Aleksandar

PS

The only thing that I could find on Google, is that DDL could stand for:
Distortion Detection Loop

Some links:

http://www.aes.org/e-lib/browse.cfm?elib=2814

http://64.233.183.104/search?q=cach..._MEANS.html+"Distortion+Detection+Loop"&hl=en

http://64.233.183.104/search?q=cach..._FEED).html+"Distortion+Detection+Loop"&hl=en

But I still don't how it should operate on my tuner

 

[bolly]

PM member Negotiableterms, he has a KA-917

maybe he can help

 

[bolly]

info from Tuner Information Center (TIC)

click here

 

[Kuja]

click here

Thanks!

Yes, I already checked the www.fmtunerinfo.com site

Couldn't find the needed info.

I also posted the question at http://groups.yahoo.com/group/FMtuners/

So far I got zero answers...

 

[Danamc]

I'm reading from an original copy of the KT-917 advertising brochure about the DDL function. It says:

"In another departure from conventional tuner design, the KT-917 incorporates a new feedback loop that monitors for distortion for extreme accuracy in tuning. The Distortion Detection Loop (DDL) is light years ahead of common synthesizer or quartz-locked systems which focus on only one aspect of distortion. By following up on any drift occurring anywhere between the RF oscillator and the IF filter, the DDL takes no chances with distortion at all. The Key to DDL's unique design is that it monitors distortion components that may occur in the IF pass band and adjusts local oscillator frequency to correct precisely in the center for the minimum distortion point, rather like a marksman. The DDL circuit operates automatically. But as soon as your fingers touch the tuning knob, a logic circuit intervenes until you have tuned to the desired station to its approximate center-tuning point. Release your fingers, and the DDL comes into effect to lock the station to its point of minimum distortion. The DDL light tells you this point has been reached." Hope this clears up some of the confusion with this DDL feature.

To answer your dilemma the manual says "the light goes out if the antenna signal is too low". Another consideration is that this vintage tuner may have a bulb burned out. Good luck!

Dana