'Re: [Elecraft] K3 and KSYN3A'

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List:       elecraft
Subject:    Re: [Elecraft] K3 and KSYN3A
From:       "Robert Wood" <woodr90 () gmail ! com>
Date:       2015-05-29 3:31:58
Message-ID: 001001d099c0$05d52650$117f72f0$ () gmail ! com
[Download RAW message or body]

Looked at the sm5bsz pdf showing the K3 at -128 db at 100khz on phase noise
100khz to 200khz likely to be popular same band operation of K3's at your
local Field Day

however 

Looking at the published Jan 2009 QST, I read  -148db at 100khz separation -
aka the pdf is a bit off 
Reviewing the ARRL phase noise graphs shows K3  is not just better but
superior to other rigs in "Noise" NOT produced at 100khz spacing .....
this is from Figure 3 in the K3/100 writeup in Jan 2009 QST
somewhat long process to go look all reviews up and note at 100khz (gave
presentation to club on this)

ARRL says the graph is -dBc referenced, 
Checked a few other rigs listed in pdf, doesn't match ARRL graphs for
composite-noise test in the report 
the conclusion is same but  Might want to report what ARRL graph shows at
100khz spacing

73 Robert W5AJ

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces@mailman.qth.net] On Behalf Of Fausto
Coletti
Sent: Thursday, May 28, 2015 9:00 AM
To: Dave Olean; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 and KSYN3A

Hi Dave,

Here you can read an example of the problem that you mentioned:

http://www.sm5bsz.com/dynrange/dubus313.pdf

Unfortunately, there are many poor quality radio on the market.

73, Fausto IK4NMF

----- Original Message ----- 
From: "Dave Olean" <k1whs@metrocast.net>
To: "bozidar" <bozidarms@yahoo.de>; <elecraft@mailman.qth.net>
Sent: Thursday, May 28, 2015 3:40 PM
Subject: Re: [Elecraft] K3 and KSYN3A

>I tried the same thing on the bench with an old K3 with original synth 
>boards (no stiffeners) that I was upgrading.  The new synth boards went in 
>just fine and I inserted a test signal at 28.0150 at 0dBm, 1 milliwatt. I 
>then tuned 1 kHz away and watched the noise floor drop to S1, so  that I 
>could hear a -130 dBm signal just fine only 1 kHz away at 28.0161. I also 
>had the 400 Hz 8 pole filter engaged, but my eyes bugged out at the 
>performance. If there was any reciprical mixing, the band would have been 
>filled with broadband noise. I used to use the old Kenwood radios back in 
>the 80's  (TS-820S and TS-830) They had all sorts of LO noise and croaked 
>badly with about an 80 dB range as I recall. A strong signal would fill up 
>the band for over 100 kHz  either side with reciprical mixing noise. I am 
>seeing a radio that is about 50 dB better than that.  I replaced the 
>Kenwoods with Ten Tec OMNI Vs and saw a huge improvement, but nothing like 
>what I am seeing with the new K3 synthesizer. Receivers can be so good now 
>that the real problem is transmitted junk from other radios and not front 
>end deficiencies in your radio.
>
> Dave K1WHS
> ----- Original Message ----- 
> From: "bozidar" <bozidarms@yahoo.de>
> To: <elecraft@mailman.qth.net>
> Sent: Thursday, May 28, 2015 12:15 PM
> Subject: [Elecraft] K3 and KSYN3A
>
>
>> Hi,
>> just done some tests with K3 and KSYN3A and result are amazing,
>> (it is not a scientific test in Sherwood stile, but say enough):
>>
>> it is a  P3 schreenshot as proof of incredible strong signal handling of 
>> K3
>> with new KSYN3A board:
>> /P3 freq. span is 5 kHz,
>> red band is signal 59+60dB, centered on 7.134 MHz,
>> K3 is on SSB mode, filter BW2.4kHz center weighted (normalized - green 
>> band)
>> -  on 7.134 MHz,
>> in filter BW is SSB signal clearly and laud herd./
>>
>> This all, remind me on video from IC7851 vs IC7800 RMDR characteristics,
>> with strong signal and week one ,300 Hz offset( search for Icom IC-7851 
>> vs
>> IC-7800 RMDR Characteristics on YouTube)
>>
>> Comments encouraged!!!
>>
>> 73  de S50BN
>> <http://elecraft.365791.n2.nabble.com/file/n7603576/P3_screenshot.bmp>
>>
>>
>>
>>
>>
>> --
>> View this message in context: 
>> http://elecraft.365791.n2.nabble.com/K3-and-KSYN3A-tp7603576.html
>> Sent from the Elecraft mailing list archive at Nabble.com.
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