From: phil_a@tpg.com.au   
      
   "patrick-turner"   
      
   The 207A is described as an audio sweep oscillator, which I assume means the   
   F starts at 20Hz and over a time period the F is smoothly changed up to   
   20kHz, enabling the audio F response of filters and speakers etc to be seen   
   on a CRO screen.   
      
   ** Not at all, it is not a sweep generator.   
      
   Operation is purely manual and its uses rather limited to things like   
   testing audio lines ( in studio and broadcast) for flat response, checking   
   limiters and VU meters and also maybe speakers in production for unwanted   
   rattles and noises.   
      
   Audio sweep generators typically used the difference ( or beat) frequency   
   between two RF oscillators.   
      
   See pic of HP207A here:   
      
   http://www.ebay.com/itm/HP-207A-Audio-Sweep-Oscillator-HEWLET-PA   
   KARD-UNTESTED-TEST-EQUIPMENT-/111196164864?nma=true&si=X2iwtbTba   
   mF1kymGPPHGlP7gXY%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557   
      
      
   ...  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)