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Author Topic: Icom IC-R8600 Wideband Receiver  (Read 26535 times)
AA7AS
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Posts: 3




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« Reply #30 on: August 11, 2017, 06:09:49 AM »

The IC-R8600 is using the same FPGA as the IC-7300, so I'll guess the noise blanker / waterfall performs identically.

That's not 100% definitive; FPGA traditionally means "Field Programmable Gate Array", and if that's what the chip is, then the reprogramming required is trivial - a very high performance blanker requires only level detection, a switched multiplier/data gate, and a counter. It's where it is in the data processing that makes or breaks the waterfall / spectrum in the presence of noise. The same chip could be programmed differently for the ICR8600. And for future releases of the IC-7300, for that matter (which really needs such a fix... I cannot possibly emphasize enough that the way it works now is the wrong way.)

Also, based on the IC-7300's performance, the noise blanker implementation may not be in the FPGA at all. If the FPGA is doing the FFT for the spectrum, then they'd have to add it in there. However, if the FPGA is providing the baseband RF for the spectrum, then it can also be implemented in the CPU. From the block diagram, it's unclear exactly what data the FPGA is producing.

So, to recap, there are two possible ways the noise blanker could be done properly in the IC-R8600:

1) If the S/W FFT is done in the FPGA, the first is different FPGA programming, which may not change the FPGA designation.

2) If the S/W FFT is being done by the CPU, the second is only a very small CPU code change and doesn't affect the FPGA.

The only way to know short of an ICOM engineer stepping in here and telling us, is to observe the radio's actual performance.
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OH6I
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Posts: 42




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« Reply #31 on: August 23, 2017, 11:19:47 PM »

http://webpages.charter.net/n9ewo2/icr8600.html
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PITSWL
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Posts: 175




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« Reply #32 on: Yesterday at 09:19:32 AM »


Incredibly informative review; many thanks!
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"Section 97.101(d) prohibits ALL amateur licensees from causing harmful interference, and does not provide ANY exception for interference caused to other amateurs whom the interferer believes have violated a Commission rule." - DA 16-877 at 17
N0YXB
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Posts: 1045




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« Reply #33 on: Yesterday at 01:32:26 PM »

Indeed, thanks for the link!
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VR2AX
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Posts: 799




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« Reply #34 on: Today at 01:59:14 AM »

Wonder whether anyone here has tested one? The positive comparison to the IC-9500 certainly makes this tempting at USD2K.

Does anyone understand the reference to deployment with 2 receivers on a 19 inch rack here?

http://www.icomamerica.com/en/products/amateur/receivers/r8600/default.aspx

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