[Elecraft] K3 and KSYN3A

[Fausto Coletti]

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 at metrocast.net>
To: "bozidar" <bozidarms at yahoo.de>; <elecraft at 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 at yahoo.de>
> To: <elecraft at 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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