[Elecraft] XG3 All-Band RF Signal Source/phase noise performance?

[Don Wilhelm]

  John,

Sorry to hear that your 8640 is nearing its end.

My recommendation (and my personal preference) - hang onto the HP8640 
for as long as it works - in  the available signal generator field, it 
cannot be beat for low phase noise along with a well calibrated output 
attenuator.  Sure it takes a couple hours for it to stop drifting, but 
the other factors make it a very worthwhile tool for the workbench.
I now have 2 HP8640's, but I have ordered the XG3 because it is 
convenient and will be the "workhorse" of the workbench signal 
generators.  But when it comes down to applications that require no 
leakage, and well calibrated output levels down to -140 dBm (and below 
with in-line attenuators), you can bet that the old '8640 will be my 
generator of choice.

The XG3 will be replacing my XG1 and XG2, but the HP8640 will stay at 
the bench for those times when nothing else will do as well.

73,
Don W3FPR

On 4/13/2011 9:46 PM, juergen wrote:
> Hi
>
> No phase noise performance data in the manual. What is the phase noise performance of the XG3 like?
>
> My HP8640 is being held together by a miracles and prayers, I need a replacement.
>
> 73
> John
>
> --- On Wed, 4/13/11, Wayne Burdick<n6kr at elecraft.com>  wrote:
>
>> From: Wayne Burdick<n6kr at elecraft.com>
>> Subject: Re: [Elecraft] New Elecraft product: XG3 All-Band RF Signal Source
>> To: "Rick Dettinger"<k7mw78 at gmail.com>
>> Cc: "Elecraft Elecraft"<Elecraft at mailman.qth.net>, "QRP-L"<qrp-l at mailman.qth.net>, elecraft at yahoogroups.com
>> Date: Wednesday, April 13, 2011, 2:36 PM
>> Rick Dettinger wrote:
>>
>>> 0 dbm.  OK, how do I key this QRP
>> transmitter....
>>
>> You could key it from a PC with a couple of RS232 commands,
>> although 
>> the keying won't be shaped unless you do it externally.
>>
>> As far as I know, no one on our staff has made a QSO on an
>> XG3 yet. 
>> But keep in mind that 0 dBm is only 30 dB below 1 watt. So
>> if your 1-W 
>> QRP rig is S9 at the receiving end, the XG3 would be about
>> S3.
>>
>> Suitable antenna design is left to the reader.
>>
>> 73,
>> Wayne
>> N6KR
>>
>>
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