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Author Topic: Icom IC-R8600 Wideband Receiver  (Read 44770 times)
KD7RDZI2
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Posts: 226




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« Reply #15 on: April 02, 2017, 02:47:10 PM »

Are the sensitivity figures on UHF up to 3Ghz that good?
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K5TED
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Posts: 96




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« Reply #16 on: April 02, 2017, 06:38:15 PM »

Are the sensitivity figures on UHF up to 3Ghz that good?

I don't know.. Are they? http://lmgtfy.com/?q=ic-r8600+spec
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W6RZ
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Posts: 161




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« Reply #17 on: April 03, 2017, 06:20:42 PM »

IC-R8600 manual (in English).

http://www.icom.co.jp/world/support/download/manual/pdf/IC-R8600_ENG_Basic_0_Book.pdf

Sensitivity specifications are in dBu, which is a little annoying.
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K5TED
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Posts: 96




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« Reply #18 on: June 01, 2017, 06:02:33 PM »

list price, $3k for the government model. Probably won't sell many of these in the hobbyist market. 
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VA3VF
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Posts: 819




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« Reply #19 on: June 02, 2017, 06:50:14 PM »

list price, $3k for the government model. Probably won't sell many of these in the hobbyist market. 

I have not looked at the specs, but for that price, I think I would go for an IC-7610.

73 de Vince, VA3VF
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SHORTWIRE
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Posts: 109




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« Reply #20 on: June 27, 2017, 12:41:54 PM »

list price, $3k for the government model. Probably won't sell many of these in the hobbyist market. 

I have not looked at the specs, but for that price, I think I would go for an IC-7610.

73 de Vince, VA3VF

Oh..!

How well does the 7610 receive S-Band?
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VA3VF
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Posts: 819




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« Reply #21 on: June 27, 2017, 04:56:11 PM »

list price, $3k for the government model. Probably won't sell many of these in the hobbyist market. 

I have not looked at the specs, but for that price, I think I would go for an IC-7610.

73 de Vince, VA3VF

Oh..!

How well does the 7610 receive S-Band?

Very well with a SHORTWIRE.  Grin

But you are right. I did not look at the specs, and was thinking only in HF terms.

Is it true that on VHF+ it is a superhet design, not SDR?

73 de Vince, VA3VF
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W6RZ
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Posts: 161




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« Reply #22 on: June 28, 2017, 04:15:20 PM »

IC-R8600 has received FCC certification.

https://fccid.io/AFJ381800
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W6RZ
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Posts: 161




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« Reply #23 on: June 29, 2017, 03:42:45 PM »


Is it true that on VHF+ it is a superhet design, not SDR?


It's a hybrid superhet and direct sampling design above 30 MHz. Here's the block diagram.



IF frequencies are:

Code:
Receive frequency (MHz)         1st IF (MHz)    2nd IF (MHz)   3rd IF (MHz)
0.010000 to 29.999999               -               -              -
30.000000 to 499.999999           778.7            46.35           -
500.000000 to 1099.999999         278.7            46.35           -
1100.000000 to 1499.999999     900 - 500.00001     278.7          46.35
1500.000000 to 3000.000000     1000 - 500          278.7          46.35
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VA3VF
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Posts: 819




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« Reply #24 on: June 29, 2017, 03:52:05 PM »

Is it true that on VHF+ it is a superhet design, not SDR?
It's a hybrid superhet and direct sampling design above 30 MHz. Here's the block diagram.


Thanks for the info.

73 de Vince, VA3VF
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SHORTWIRE
Member

Posts: 109




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« Reply #25 on: June 30, 2017, 07:21:05 AM »

 Roll Eyes Roll Eyes

Very well with a SHORTWIRE.  Grin

But you are right. I did not look at the specs, and was thinking only in HF terms.

Is it true that on VHF+ it is a superhet design, not SDR?

73 de Vince, VA3VF

The reason for Shortwire is that I am using indoor antenna, and so can't fit a LONGWIRE, although now mostly just SWL'ing on a Wellbrook.

Yes, it's a hybrid above HF, as someone else pointed out.
I don't believe it would currently be possible to make a 3GHz radio with direct sampling, or at least not at amateur prices.. :-)

It's main downside will be if they are using a resistive display, rather than capacitive. Isn't that the case on the IC-7300?

I would have hoped that for that amount of money they could have used a capacitive display, but maybe not?

This is a Communications Receiver, not a bloody scanner...  Roll Eyes

I'll most likely buy it anyway, my ancient AR5000 with it's now bodged on unoriginal encoder needs a replacement.
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VE3WGO
Member

Posts: 153




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« Reply #26 on: July 02, 2017, 04:02:09 PM »

The block diagram looks like the 8600 is an HF SDR with a pair of tuneable converters for the UHF and Microwave bands.  It is still very much an SDR in every sense.

If it had used Microwave A/D converters up to 3 GHz we wouldn't be happy about the price.

Icom now has an updated brochure on their website.  Looks like it can display up to 5 MHz of spectrum at a time.  On top of the usual analog modes (AM, W/FM, SSB, CW, etc) with DSP filtering, it receives D-star and P25, also receives dPMR which is new and includes license free radios in the 446 MHz region. This is a very interesting radio!

 

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AA7AS
Member

Posts: 3




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« Reply #27 on: August 10, 2017, 11:22:14 AM »

My main question is, did ICOM foul up the noise blanker implementation the way they did on the IC-7300?

In the IC-7300, the noise blanker is applied after the waterfall / spectrum. So if there's noise and the blanker is turned on, the signal can be heard to whatever extent the blanker works (the blanker in the 7300 is not great) but the waterfall / spectrum remains blitzed by the noise, making it one heck of a lot less useful.

A good SDR noise blanker design does its blanking prior to the waterfall; a great SDR noise blanker design allows you the choice of either, so you can see the noise if you want to, or the signals the blanker can allow you to receive if that's what you prefer (and in my experience, the latter is what one usually wants.)

And both should do a better job at eliminating noise than the stock one in the IC-7300 does.

I own two IC-7300s; one in the shack, one in the pickup (which mounts a portable RF-PRO-1B loop.) The noise blanking design is the most significant problem with the radio's general ability to receive. It's a pain; to receive well using the waterfall / spectrum, I have to drive the truck out into the country where there is no noise. Otherwise, it's just like hunt-and-listen tuning an old-school radio, because I can't see squat on the waterfall / spectrum.

So for anyone who has one, in the presence of noise, does the waterfall / spectrum obviously clean up when you engage the noise blanker? This would be extremely visible. Or does it remain the same? That'll tell the tale.

I'm very interested in the 8600, but I'm not paying that kind of money for a radio that goes blind in the presence of noise. Better off with good SDR software and a wideband SDR or two.
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VE3WGO
Member

Posts: 153




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« Reply #28 on: August 10, 2017, 06:41:52 PM »

Hi, in case you haven't already seen this, here is a page with some interesting evaluations of the radio, and comparisons with other radios in several listening tests.

Overall, it seems to be a really excellent performer, and check those very interesting interior photos....

https://www.fenu-radio.ch/Icom_IC-R8600-en.htm

This would make an excellent wideband portable or fixed station receiver and spectrum analyzer too, I suppose.
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W6RZ
Member

Posts: 161




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« Reply #29 on: August 11, 2017, 05:13:14 AM »

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

From N4IP's Twitter page.

https://twitter.com/ibelings/status/891438949331238916
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