There is more info on the 8920 group
/g/HP8924-Family-Spectrum-Analyzers/topics
I've used both Gonbes 8200 (8220 is same but 2 VGA outputs) + LM1881, the Sont DSC104 and a professional scan converter. The Gonbes is better than the Sony but all are acceptable. One thing to watch is matching the VGA monitor to the converter output. If the output is standard VGA a higher resolution monitor can actually give a worse picture. An older monitor with matching native resolution works best.
Robert G8RPI.
