Author Topic: Icom IC-7300 (Read 35601 times)

deephaven · « **Reply #50 on:** April 01, 2016, 07:11:26 pm »

Lucky man. I'd be interested in your impressions of it once you found yourself around it.

AF6LJ · « **Reply #51 on:** April 01, 2016, 07:28:05 pm »

Very nice; can't wait to hear what you think.

TheSteve · « **Reply #52 on:** April 01, 2016, 08:00:18 pm »

Very nice, as others have said it looks like a baby IC-7600. The initial reports I am hearing are all quite positive. Receiver testing done by Adam VA7OJ and Rob Sherwood NC0B should be out in a few days, then we will know how it really performs.

voltz · « **Reply #53 on:** April 02, 2016, 09:06:05 pm »

Oh nice. Do let us know what you think of it

davebb · « **Reply #54 on:** April 03, 2016, 10:59:23 am »

But can it be locked with a 10mhz ext ref
Dave 2E0DMB

German_EE · « **Reply #55 on:** April 03, 2016, 02:20:46 pm »

What good would a 10 millihertz reference be? A 10 MHz reference is a much better idea even if I'm not sure that the IC-7300 can use it

dr.diesel · « **Reply #56 on:** April 03, 2016, 02:30:37 pm »

Quote from: davebb on April 03, 2016, 10:59:23 am

But can it be locked with a 10mhz ext ref
Dave 2E0DMB

Nope.

I've had very little time with it, but so far I very much like the menu navigation and the compactness of the rig. This is my first Icom rig, but I'm willing to bet it's pretty easy to win me over from Yaesu, which I despise more and more by the day.

davebb · « **Reply #57 on:** April 03, 2016, 03:40:51 pm »

Looks like a very nice radio, I used a icom ic-7000 in the car that was very nice with the filters,
I live close to a radio shop so I hope that they get one in so I can have a play/look

I have seen demos on youtube ,How good is the filtering with very close in frq and high signal strength ?,
as I have a kenwood TS-2000 and when I got that the filtering was not that good, but now that I fitted a inrad filter it has changed the radio, And It is locked to a 10MHZ ref gpsdo using a board from David Smith VK3HZ as the radios ref is 15.6MHZ
Have fun with your new radio, lut use know more about what you think once you get use to it
Dave 2E0DMB

eliocor · « **Reply #58 on:** April 04, 2016, 04:52:18 pm »

Does it have an I/Q exit?
If not, how can it be called a "REAL" SDR radio?

wkb · « **Reply #59 on:** April 04, 2016, 06:01:23 pm »

Quote from: eliocor on April 04, 2016, 04:52:18 pm

Does it have an I/Q exit?
If not, how can it be called a "REAL" SDR radio?

Why not?

AF6LJ · « **Reply #60 on:** April 04, 2016, 06:39:40 pm »

Quote from: eliocor on April 04, 2016, 04:52:18 pm

Does it have an I/Q exit?
If not, how can it be called a "REAL" SDR radio?

Since when does an SDR have to have I and Q outputs?
What if the computer that controls the radio is in the radio?

eliocor · « **Reply #61 on:** April 04, 2016, 10:31:16 pm »

If you say so, you surely have never used Tx/Rx like the FDM-DUO or similar devices like the Perseus receiver...
Just an example, in 2002 there was the Digimit:
http://microtelecom.it/digimit/
http://www.microtelecom.it/digimit/digimit2002.htm
just SOME time earlier than the IC-7300...

wkb · « **Reply #62 on:** April 05, 2016, 05:58:57 am »

You still haven't given a sensible reason why the 7300 should not be called an SDR radio.

borjam · « **Reply #63 on:** April 05, 2016, 06:00:58 am »

Quote from: eliocor on April 04, 2016, 10:31:16 pm

If you say so, you surely have never used Tx/Rx like the FDM-DUO or similar devices like the Perseus receiver...
Just an example, in 2002 there was the Digimit:
http://microtelecom.it/digimit/
http://www.microtelecom.it/digimit/digimit2002.htm
just SOME time earlier than the IC-7300...

SDR means exactly Software Defined Radio. It doesn't mean radio with an IQ output. Also, SDR doesn't mean "direct sampling" as some seem to suggest. At least one Flex Radio transceiver (Flex 1500) that I have seen does not have direct sampling, and I haven't heard anyone suggest that "it's not a real SDR".

It is the first SDR sold as such by one of the big Japanese manufacturers, because SDR is not new for them. For example, the IC-7200 doesn't use crystal or mechanical filters for the last IF, nor does it use analogue circuitry for modulation/demodulation. For pure marketing reasons (probably in order to avoid scaring away older/more conservative customers) they called the thing IF-DSP. But SDR it is.

And SDR techniques are used all over the place in many applications outside of the amateur radio world which, of course, don't have an IQ output or anything of the sort.

It's quite funny, actually, that some sort of religious cult has sprout around SDRs and soon there will be true believers, heretics and such

Anyway, as the market matures, SDR becomes more of a medium and less of an end itself.

AF6LJ · « **Reply #64 on:** April 05, 2016, 02:13:37 pm »

I see that some of you have a problem seeing the difference between "Digital" and "Software Defined". I guess you never worked in the two way communications business.

Oh Well

borjam · « **Reply #65 on:** April 05, 2016, 02:37:40 pm »

Quote from: AF6LJ on April 05, 2016, 02:13:37 pm

I see that some of you have a problem seeing the difference between "Digital" and "Software Defined". I guess you never worked in the two way communications business.

Not pointing to me I hope!

zibadun · « **Reply #66 on:** April 09, 2016, 06:09:52 pm »

I've heard that someone was brave enough to pull the heat sink from the ADC. They found LTC2208-14 there

djacobow · « **Reply #67 on:** April 15, 2016, 10:15:47 pm »

Sherwood tests:

http://www.dj0ip.de/sherwood-forest/sherwood-xcvr-tests/icom-ic-7300/

I'm not sure why these are not up on the actual Sherwood webpage; maybe they're bogus?

AF6LJ · « **Reply #68 on:** April 15, 2016, 10:29:47 pm »

Quote from: djacobow on April 15, 2016, 10:15:47 pm

Sherwood tests:

http://www.dj0ip.de/sherwood-forest/sherwood-xcvr-tests/icom-ic-7300/

I'm not sure why these are not up on the actual Sherwood webpage; maybe they're bogus?

I don't think he is done yet.
We'll see.

TSL · « **Reply #69 on:** April 15, 2016, 10:38:01 pm »

Quote from: djacobow on April 15, 2016, 10:15:47 pm

Sherwood tests:

http://www.dj0ip.de/sherwood-forest/sherwood-xcvr-tests/icom-ic-7300/

I'm not sure why these are not up on the actual Sherwood webpage; maybe they're bogus?

Hmmm interesting, but I question the methodology, using another radio for tx phase noise test as your test gear is questionable at best despite it being a top line SDR. Additionally no methodology is given for receive tests.

AF6LJ · « **Reply #70 on:** April 16, 2016, 03:27:09 am »

Quote from: TSL on April 15, 2016, 10:38:01 pm

Quote from: djacobow on April 15, 2016, 10:15:47 pm

Sherwood tests:

http://www.dj0ip.de/sherwood-forest/sherwood-xcvr-tests/icom-ic-7300/

I'm not sure why these are not up on the actual Sherwood webpage; maybe they're bogus?

Hmmm interesting, but I question the methodology, using another radio for tx phase noise test as your test gear is questionable at best despite it being a top line SDR. Additionally no methodology is given for receive tests.

It would be tie same as using a spectrum analyzer you just have to take the equipment generated noise into account.
The local HRO has one on display, next time I have a few minutes to spare I plan on going in and using it for a bit.

donmr · « **Reply #71 on:** April 21, 2016, 04:38:38 pm »

SDR means SOFTWARE Defined Radio. Software means something that can be changed after the system is built.

If this radio (or any radio) has its code in a ROM and does not have I/Q outputs, the I'd call it a FIRMWARE Defined Radio.

One of the attractions of SDR is that the user can experiment with new modes and protocols long before the big radio manufacturers decide to support them.

Now if they would listen to Bruce Perens and put the DSP in a separate processor which the user can program (or install something someone else wrote). Then they would have a very attractive SDR product.

zibadun · « **Reply #72 on:** April 22, 2016, 01:56:24 pm »

Quote from: donmr on April 21, 2016, 04:38:38 pm

Now if they would listen to Bruce Perens and put the DSP in a separate processor which the user can program (or install something someone else wrote). Then they would have a very attractive SDR product.

wouldn't an open source firmware be nice? similar to a hacked fw for the Canon cameras http://chdk.wikia.com/wiki/CHDK

but don't hold your breath...

dr.diesel · « **Reply #73 on:** April 26, 2016, 01:01:14 pm »

In depth testing/review:

http://www.ab4oj.com/icom/ic7300/7300notes.pdf

TSL · « **Reply #74 on:** April 27, 2016, 01:03:30 am »

And the schematic is available here too !

http://www.qrpblog.com/2016/02/icom-ic-7300-schematic.html


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Author Topic: Icom IC-7300 (Read 35601 times)

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