I want to buy one old or new vector network analyser with fre. upto 500 or 1300 Mhz with 75 ohm impedance.
If old/refurbished ok, then kindly suggest reliable dealers in USA/UK.
HP/Agilent prefered due to service/calibration facility available in my country.
Boy, you are in luck! 75 ohm analyzers are highly NOT wanted, so you can get them at around 1/2 the price! Everyone wants the 50 ohm ones.
As far as who? There are plenty of reputable dealers of used gear. But, the reputable ones want more money than the fly by night ebayers. Whatever you do, get one withat least a right of return, and preferrably a 90 day minimum warranty.
You can get an idea who has one from this website, and then try to check the dealer out.