Hi Scott & Dick, Thank you for the replies. Actually, the fellow selling it allowed me to bring it home and tinker with it and like I said i'm not familiar with it on how to really use it. It powers up and I could see some "activity" in the screen. Anyways, I'll be seriously taking into consideration about what you guys have noted on your replies.
Thanks everyone. jay --- In [email protected], "Scott Overstreet" <[EMAIL PROTECTED]> wrote: > > Jay--- > > Take warning--- > > The TEK 491 SA has a very primitive front end mixer in it. This mixer is not a balanced type and passes considerable input signal direct to the IF amplifier which is in the 150 to 250 mHz region, if I remember right. This mixer blow through makes for considerable confusion in off air measurements and actually in most VHF applications------it is fine up in UHF and microwave. We have one here that was given to us-----we have plans to replace the mixer with a Mini Circuits balanced type with hopes for improved to usable performance. > > Scott, N6NXI > > > > ----- Original Message ----- > From: Jay Sario > To: [email protected] > Sent: Thursday, July 26, 2007 7:30 PM > Subject: [Repeater-Builder] Tektronix TEK-491 spectrum analyzer > > > Hi to everyone, > > A fellow here in our location is selling me a cheap working Tektronix > 491 spectrum analyzer that doesnt have the standard accessories. My > knowledge on how to use this type of equipment is limited at the > moment but very interested in getting to know how. Just would like to > ask before I buy it, would I still be able to put it in good use or be > able to measure things even if the standard accessories are not > included, like the waveguide mixers, etc.? Can i substitute them with > homebrewed ones? > > Thank you much. > > jay >
