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In the Forum: Off Air Audio
In the Thread: Is anybody live in Australia with a tuner and an interest?
Post Subject: Some improved resultsPosted by peter foster on: 11/8/2008
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 Romy the Cat wrote:
Hm, interesting.

The problem might be in ADC, I/O cared, Recorder or DAC. When you do the experiment do you record the file? If so then you might plug ADC directly into DAC. Might your problem be with cloaking? I do know what erumpent you use but can you slave your DAC from you ADC when you use them directly? If you use Lavry 924 (I know you have it) then do you use XLR or RCA? Do you take out of the chain all the other digital devises that I know you use?

The Cat


A.  Performed more tests today with much improved results.

- DAC is slaved directly from ADC.
- No other digital devices are in the chain.

B.  Connections are proper: -

- RCAs (2) from FM tuner to adaptors (2).
- XLRs (2) from adaptors to ADC.
- XLRs between ADC sections.
- XLR (1) from ADC to DAC.
- RCAs (2) from DAC to amplifier.

C.  Conclusions so far: -

- FM tuner FIXED ANALOG OUTPUT [Dolby FM].
    - The brochure specifies output voltage and impedance as 1.5 V and 2.5 kOhms.
    - DO NOT USE as an ADC source.
- FM tuner VARIABLE ANALOG OUTPUT.
    - The brochure specifies output voltage and impedance as 0.2 V
    - Set output dial very low (e.g., 1).
    - Set ADC microphone preamplifier gain high (e.g., 50).
    - USE as an ADC source.
    - MUCH BETTER RESULTS.
- I will continue testing.

D.  The chain and settings are as follows: -

    Sansui FM tuner variable analog output.
        FM SIGNAL 80%.
        FM MODE set to AUTO.
        IF BAND set to NARROW.
        MUTING set to OFF.
        NOISE FM set to OFF.
        CAL TONE set to OFF.
        OUTPUT-1 (variable FM output) set to 1.

    Lavry Blue ADC - microphone preamplifier section.
        MICROPHONE SELECTION set to DYNAMIC.
        GAIN PAD set to OFF.
        LEFT CHANNEL GAIN (dB) set to 50.
        RIGHT CHANNEL GAIN (dB) set to 50.

    Lavry Blue ADC - MSYNC section.
        48/96 44/88 set to 48/96.
        HIGH LOW set to HIGH.
        WIDE NARROW set to NARROW.
        INT AES set to INT.

    Lavry Blue ADC - converter section.
        24 bit word.
        PEAK/HOLD.

    Lavry Gold DAC.

    Amplifier.

    Speakers.

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