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Re: 8516A cable question
If you know the cable connections please POST it to the board. That way, he can check his cable and "fix" it if necessary. BTW - IS the cable straight through? If so, which conductors are needed?
By Bruce · #123188 ·
Re: 8516A cable question
I bought mine on ebay for $800 , spend quite a bit of time trying to figure out the cable Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows Sent: Wednesday, March 2, 2022 7:13
By Lothar baier <Lothar@...> · #123187 ·
Re: 8516A cable question
Seems like the wrong wearing due to a cross over or some other "defect" could cause intermittent operation. How about using a break out box to look at the signals. I've never owned an 8516 (owned most
By Bruce · #123186 ·
Re: Spectrum analyser in a high traffic strong signal environment
In case anyone is interested, there is some amazing new technology that came out using some interesting magnetic materials that automatically filters out any frequencies above a certain threshold
By Jim Ford · #123185 ·
Re: 8516A cable question
There is no schematic for the 8516 only a few block diagrams , the switching isn¡¯t done by relays but rather with pin diodes inside the brick , the doubler control board is buttoned up on the
By Lothar baier <Lothar@...> · #123184 ·
Re: 8516A cable question
Sure but it is comparatively slow - Normal 8510C sweep is relatively slow, and the problem can be avoided by only weeping 50-20 and say 25-40GHz. I think the best first step is to look at the doubler
By Bruce · #123183 ·
Re: 8516A cable question
Disagree with you on this, dont forget that the synthesizer is swept so if you do a 45MHz to 40GHz sweep the doubler is switched in and out constantly so your DC now becomes a squarewave , also the
By Lothar baier <Lothar@...> · #123182 ·
Re: 8516A cable question
Missed that - the 20 ft cable seems NOT likely to be a problem - these ar DC control signals. I recall some discussion that it is a straight through cable without cross over based on looking at 8341
By Bruce · #123181 ·
Re: 8516A cable question
He mentioned earlier in this thread that its only 20-40GHz but he also mentioned using a 20ft cable ? which could be the problem, I am not sure what the control interface is , the part number of
By Lothar baier <Lothar@...> · #123180 ·
Re: Spectrum analyser in a high traffic strong signal environment
Thanks!
By DW · #123179 ·
Re: Spectrum analyzer in a high traffic strong signal environment
Great responses, thanks!
By DW · #123178 ·
Re: 8516A cable question
Does the IF error occur below 20 GHz ?? If not, the doubler is suspect - if so, look at the switching or the test set. Nexg step would be to try and look at the test set VTO. It is difficult because
By Bruce · #123177 ·
Re: Spectrum analyser in a high traffic strong signal environment
Good pojnt and actually one that is often not considered , spectrum analyzers ARE wideband and as a result signals that fall within the bandwidth of anything before the mixer WILL affect the mixer
By Lothar baier <Lothar@...> · #123176 ·
Re: Spectrum analyser in a high traffic strong signal environment
DW, You can confirm what the expected total power of multiple signals is by the usual formula: Ptotal = P of one signal + 10Log N where N = number of identical powered signals. In your example, 10
By Kit · #123175 ·
Re: 8516A cable question
Ok first of be careful with how much power you put in the testset , the damage level as far as I remember is 15dBm but usually I would not put more than 10dBm. First thing I check is whether your
By Lothar baier <Lothar@...> · #123174 ·
Re: 8516A cable question
Wow you guys are fast to help! Here is some more info: error is only from 20-40GHz, so it has something to do with the doubler I assume. Any span or frequency in this range has this error. I have seen
By Willy · #123173 ·
Re: Spectrum analyzer in a high traffic strong signal environment
Hi: You might switch in some attenuation and see if all the peaks fall by that amount. -- Have Fun, Brooke Clarke, N6GCE https://www.PRC68.com axioms: 1. The extent to which you can fix or improve
By Brooke Clarke · #123172 ·
Re: 8516A cable question
Agreed you have to excersize caution when working on the test set especially if it comes to 2.4mm connectors and hardlines Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
By Lothar baier <Lothar@...> · #123171 ·
Re: 8516A cable question
Absolutely agree, but it can be problematic to dig into the test set if the problem is in the 85202. The test set is more easilly damaged, particularly if you are unfamiliar with its innards. The
By Bruce · #123170 ·
Re: 8516A cable question
True but in all the years I been fixing those units back at tucker about 85% of all failures were testset related Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows Sent:
By Lothar baier <Lothar@...> · #123169 ·