[Elecraft] K3 & ADAT ADT-200A by HB9CBU

[Bill W4ZV]

Nico, this is truly exceptional phase noise performance!  My sincerest
congratulations to you.  Have you described how you achieved this somewhere?

73,  Bill  W4ZV



Nico Palermo, IV3NWV wrote:
> 
> Bill,
> the phase noise of Perseus is as follow:
> 
> Offset      (kHz)      2    5     10    20   >50
> Phase Noise (dBc/Hz)  -141 -145  -148  -151  <-155
> 
> As a picture is worth one thousand words, see here for more:
> 
> http://microtelecom.it/perseus/tests/Perseus-phasenoise.jpg
> 
> To make the test, the phase noise of the source generator,
> a homebrew crystal oscillator, has been neglected and it has been assumed
> that all the phase noise was due to the receiver oscillator, which is a
> crystal
> oscillator too.
> 
> A more realistic assumption is that the two oscillators, the source
> generator
> and the receiver LO, are contributing equally to the phase noise figure
> and
> in this
> case the performance of the receiver would be even 3 dB better.
> The figures indicated are thus worst case values.
> 
> For offsets larger than 50 kHz the phase noise performance cannot be
> really
> measured as the prevailing source of noise is of thermal origin and the
> noise induced by the reciprocal mixing is below the receiver thermal noise
> floor.
> 
> Now that you can compare the full table, it would be not difficult for you
> to conclude
> that even at 1 MHz offset, the blocking dynamic range of Perseus is
> greater
> than
> that of your receiver.
> 
> 
> 73
> Nico Palermo, IV3NWV
> 
> 
>>Would you tell us how Perseus compares in the following phase noise
>>performance?
> 
>>The following table is from a post by Eric WA6HHQ in September 2007.  I've
>>added the Flex 5000 based on measurements published after Eric's note:
> 
>>http://mailman.qth.net/pipermail/elecraft/2007-September/073931.html
> 
>>"Here are transmit composite phase noise numbers from the Lab for the K3.
>>Needless to say, we are pleased with the results. :-) I've also included
>>some numbers from the ARRL reviews for several late model rigs.
> 
>>Rig     1kHz    2   10   20   50   100   1M
>>K3      -110  -119 -136 -140 -143 -144  -150
>>IC7800  -103  -112 -130 -138 -140 -140  -140
>>FT2000  -102  -105 -128 -129 -128 -128  -128
>>ORION 2 -121  -129 -126 -125 -118 -128  -138
>>OMNI 7  -102  -103 -120 -123 -127 -129  -126"
>>F5000   -123 (same at all spacings de W4ZV)
>>Perseus   ?
> 
>>
>>
> 
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft    
> 
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
> 

-- 
View this message in context: http://n2.nabble.com/K3---ADAT-ADT-200A-by-HB9CBU-tp1597981p1614902.html
Sent from the Elecraft mailing list archive at Nabble.com.