Re: frequency scanners & low cost equipment

[Moshe_Valdman]

     Hello all,
     
     thanks for the responses. Still I don't have a clue re:
     
     1. How these scanners are built, any info like block diagrams 
     preferably on the net. How big are they? Do they run on batteries?
     2. Where I can buy the ones you recommend. Do the vendors have an 
     internet page? Or at least an address or some way to make contact with 
     them.
     
     thanks again
     
     moshe valdman