Re: 52 dB any good?

On Thu, 27 Apr 2006 17:49:12 +0100, Chris Isbell
<chris217_NOSPAAM@xxxxxxxx> wrote:

On Thu, 27 Apr 2006 13:44:00 +0100, "Serge Auckland"
<serge.auckland@xxxxxxxxxxxxx> wrote:

If the signal strength is -52dBm into 75 ohms, then that's a voltage level
of 687uV which is a bit low.

My Sony ST-S311 tuner gives the signal strength in dBf, which I
believe is relative to one femtowatt (10E-15W). If my calculations are
correct, then 52dBf would equate to 109uV, which is not very good at
all.

The OP's manual should hopefully define the measurement units used.

The trouble here of course is that Keith is obsessed with
measurements. What really matters is how the signal *sounds*! Is it
clean, with no multipath distortion and no noticeable hiss? Then you
have enough signal strength. :-)

--

Stewart Pinkerton | Music is Art - Audio is Engineering
.

Relevant Pages

  • Re: 52 dB any good?
    ... My Sony ST-S311 tuner gives the signal strength in dBf, ... believe is relative to one femtowatt. ...
    (uk.rec.audio)
  • Re: The product weve all been waiting for;!...
    ... femtowatt is 10^-12 AFAIAC ... Consequently, their dBf is not relative to 1 femtowatt, or their ... you would need a signal strength of better ... than 80 to get completely noise-free audio. ...
    (uk.rec.audio)
  • Re: The product weve all been waiting for;!...
    ... 55dB is a power ratio of 3.16 x 10^5 ... That would be 20dBf in my book *if* dBf means dBs relative to 1 femtowatt. ... you would need a signal strength of better than ...
    (uk.rec.audio)
  • Re: 52 dB any good?
    ... My Sony ST-S311 tuner gives the signal strength in dBf, ... The OP's manual should hopefully define the measurement units used. ...
    (uk.rec.audio)
  • Re: The product weve all been waiting for;!...
    ... Tony - I'm still waiting to hear if an FM ... signal strength of '55 dBf' as per: ... 55dB is a power ratio of 3.16 x 10^5 ... the signal drops as low as 40 dBf, ...
    (uk.rec.audio)