Hi Bob,
If it's OK with everyone, I'd like to count this as my "oh duh" moment
for today (my target is no more than one per day). I wasn't thinking
about decimation. However, assuming a bandwidth of 192 kHz and a sample
rate of 245 MHz, doesn't that only give an extra 5 bits or so of
effective resolution? That still leaves us 3 bits short of the 5000A
ADC, which still means 18 dB less dynamic range.
Maybe I missed it in the PDF file, but I didn't see a dynamic range spec.
73,
Clay W7CE
On 5/18/2012 3:44 PM, Robert McGwier wrote:
Clay :
The difference is more than made up in the the fact that the new AD
operates at 245 MHz and the old AD is 200 kHz and you get huge
processing gain in the downsample and filter process greatly increases
the dynamic range.
Bob
On May 18, 2012 4:46 PM, "Clay W7CE" <w...@curtiss.net
<mailto:w...@curtiss.net>> wrote:
Did anyone else notice that the receivers on the 6500 and 6700 use
a 16-bit ADC rather than 24-bit like the 5000A? That reduces the
dynamic range by up to 48 dB (same dynamic range as the 1500).
That will probably be fine on HF, but I already have occasional
problems with ADC saturation on 6M when locals (within 25 miles)
running 1500 watts are transmitting in the 96 or 192kHz bandpass
of my current frequency. Of course, I can eliminate the
saturation by turning off my preamp, but then I can't hear the
weak station I was trying to work.
73,
Clay W7CE
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