The cleanest regular analyser I have here for 100kHz offsets is my fairly ancient Advantest TR4172. It manages -128dBc/Hz at 100kHz offset across HF/VHF and up to 1GHz. The only spectrum analyser I have that beats the SignalHound at close offsets down at 20MHz is my 8GHz Tek RSA3408A. It beats it by maybe 15-20dB at offsets below 10kHz.
This might be of interest - I have been experimenting with 'reducing' the phase noise floor of the SignalHound.
The one which appears to work is NFE, basically just measuring the noise floor and subtracting it from the measurement - as described here:
http://literature.cdn.keysight.com/litweb/pdf/5966-4008E.pdfI have applied this to phase noise by measuring a very clean signal and then subtracting that trace from subsequent measurements. It provides about a 10dB improvement in the PN floor.
The process is basically:
Record baseline sweep of clean signal with averaging set to 1000. The Sig gen was set to Noise mode 1 which is its lowest PN mode.
Convert to dBc/Hz => dB - 17.5 for RBW of 100Hz
Convert to mW => 10 ^ (mW/10)
Call this baseline
Record actual measurement with averaging set to 1000 - I switched the noise mode of the Sig Gen to 'Normal' which is not as clean to provide the measurement.
Convert to dBc/Hz => dB - 17.5 for RBW of 100Hz
Convert to mW => 10 ^ (mW/10)
Call this mn
Calculate corrected value in mW => abs(m1 - baseline)
Convert to dBc/Hz => 10 * log(mW)
Call this mn_adjusted
Chart frequency offset vs mn_adjusted
Here is a google spreadsheet template which does this. It is view only, but you should be able to create a copy of this for yourself (File menu, Make a Copy) and then plug your own numbers into the Baseline and Measurement sheets.
https://docs.google.com/spreadsheets/d/18VlzMaz6_csRroIl1bk0MpA9q1dbmOahmxpGaENg_uw/edit?usp=sharingThis image shows the results I got measuring the 2041 in Normal noise mode with and without this:
https://docs.google.com/spreadsheets/d/e/2PACX-1vRdEo1EnRjM5oINIitp9IARpjr7TZMN9ZJw90Clzg3Rpl_2rZZi9MDotEedda1psExLc_pL910KjQDz/pubchart?oid=680692226&format=interactive