I think it's an HP of some sort but someone is using it right now and we have to get it back. The person who owns it actually has 2 of them but one needs some work and he is probably going to sell it rather than fix it.
On Tue, 16 Oct 2007 12:09:09 -0600 Nate Duehr <[EMAIL PROTECTED]> wrote: > [EMAIL PROTECTED] wrote: >> If I could afford that equipment I would do that. >> However >> the thought of spending as much on test equipment as a >>new >> car is a little tough. > > Totally understand. Although many good service monitors >can be had for > the price of a USED car, not a new one -- if that's >helpful information. > > :-) > > (I hunted for three years and found an IFR 1500 for $2K >in great > condition, with a fairly recent calibration sticker.) > >> We do have a service monitor in the group I hang out >>with >> but it does not have a tracking generator. > > A tracking generator is not necessary (or desired) for >this test. Those > are used for tuning duplexers, and sweeping antennas -- >etc. Things > that require a "sweep" of frequency. > > You don't need to sweep the receiver - you just need a >variable strength > signal on the receiver input for desense and receiver >sensitivity tests. > > A service monitor is a signal generator by definition, >so you have just > about everything you need to do the tests already. > Depending on what > type it is, it may also be able to measure SINAD for >you. > > If not, with a little practice you can learn to "hear" >about where 12 dB > SINAD is, and how it relates by ear to a full-quieting >signal. Not as > accurate at all, but you could get a ballpark idea of >how well your > receiver is working. > > The desense test only requires a known 12 dB SINAD >measurement if you're > trying to measure how MUCH desense is present. > > Any weak signal as long as it's consistent (even a >friend with an HT on > a fixed antenna far away or through a lot of attenuation >and very low > power) can be used as a weak signal source to check >whether desense is > present. > > What model/brand of service monitor is it? Perhaps we >can help explain > how to set the test up. I've played with a Cushman >CE-5, a Motorola > 2600 (?) a couple of older Motorolas, IFR 1200's and >1500's and HP 8920 > series. I'm sure others here could explain how to set >up other service > monitors... > > Nate WY0X
