Hi,I am student & curiously want to build a practical ,high frequency spectrum analyzer , Do you have any comment about " matjaz vidmar,s53mv" articles on VHF COMMUNICATION magazine ? Has any one worked on it? I've heard there are some problem on the " microwave vco" , which is one of the those articles ?is it practical? Is it simple to build? What is the epsilon (r) of glassfiber epoxyFR4 ? Any comment? Any help would be most appreciated. snipped-for-privacy@yahoo.com