PMEL Forum

K Sections => K3/4 - Waveform Analysis & RF Generation => Topic started by: PurelyNonsense on 03-20-2018 -- 15:02:04

Title: E4407B (AN/USM-677) *NEED HELP ASAP*
Post by: PurelyNonsense on 03-20-2018 -- 15:02:04
Good morning all,
I'm assisting a tech with a repair on a spectrum analyzer. Since I have little experience on the piece, I wanted to know if anyone has experience repairing these? First off let me let you know what is the issue.
The unit shows that ever signal below approximately 3 GHz is reading up to 20 dBm. So it won't align or even be useful. We tried replacing parts with known good ones. The tech even replaced the RF section to no avail. Replacing the attenuator board helped a little but not enough. Any ideas?
Title: Re: E4407B (AN/USM-677) *NEED HELP ASAP*
Post by: griff61 on 03-20-2018 -- 18:33:57
Questions
Is the battery good?
Did you reset the defaults?
Do you have the ability to realign it there or do you need to evac?
Where does the white go when the snow melts?
Title: Re: E4407B (AN/USM-677) *NEED HELP ASAP*
Post by: PurelyNonsense on 03-26-2018 -- 10:44:00
Hey there Griff, we got it. It's the IF section that's bad. Time to order some parts now! And the white goes back to the magic calibration fairies when the snow melts to check the luminosity for the next batch. My question is, do you have real white sands in White Sands? And why is it white? Is the cartel involved?
Title: Re: E4407B (AN/USM-677) *NEED HELP ASAP*
Post by: griff61 on 03-26-2018 -- 15:50:34
My question is, do you have real white sands in White Sands? And why is it white? Is the cartel involved?

Not quite that exciting...it's all about the gypsum, but you can toboggan on them and not get wet!
Title: Re: E4407B (AN/USM-677) *NEED HELP ASAP*
Post by: flew-da-coup on 03-27-2018 -- 16:02:25
My question is, do you have real white sands in White Sands? And why is it white? Is the cartel involved?

Not quite that exciting...it's all about the gypsum, but you can toboggan on them and not get wet!
Maybe its Pablo Escobar's ashes. Maybe?