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I checked the indicated transistors and they check good. HOWEVER: I noticed that if I change the frequency range switch to a different range, A5TP4 springs to life. Basically, if the input frequency

Hi Rainer In the past I have looked at Aeroflex Planar Crown but cannot remember how good they are compared to a APC 3.5 or a 2.92 connector Do you have any practical experience in using them also

Yup fully understand all this......even going to 22 GHz can be risky depending on what you are doing but using a N-connector at 26.5 GHz still puzzles me esp for later models made by Agilent. Not sure

Tobias, In the 4194A you can store 3 OSL cal data with frequency range, etc... That's an nice feature since it's ready, right from power on, with up to the 3 cal/config you need for the current job.

I am not an expert, but from what I have read, if you reduce reduce the charge current NiMH will be fine to replace NiCd. From memory C/20 is fine. You can achieve that by just using *high capacity*

It's working! Interesting problem, never would have found it without the CLIPs. There are a number of voltage 'sub-regulators' and filters downstream of the main power supply. One filter, an inductor

You might note that many of the Hewlett Packard spectrum analyzers of the past, that went much higher than 18 GHz, use female type N connectors on their inputs; this includes the popular 8566A and B.

Correct - The reset circuit checks the battery voltage under charge. It measures the battery voltage and the charging current and suppresses the Reset signal for both CPUs. Cheers! Bruce Quoting

Hello, User programs. --- With best regards Tam HANNA (emailing on a BlackBerry PRIV) Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at

I didn't mean to hijack the thread "How to check the accuracy of an HP 5342A frequency counter". So I am starting a new thread. I will paste in what I placed in the other thread too.

I purchased two of these and will let you know if they are successful replacement. The part number to look for is COMP-34SPC of N-SP2 replacement. It is a 2.4V 90maHr NiCad. Cheers Quoting Tobias

Hi Looks like you are not making the minimum load requirement for the PSU George G6HIG

A few reference links: Of course... https://en.wikipedia.org/wiki/N_connector Then there are... https://www.everythingrf.com/tech-resources/connectors https://www.amphenolrf.com/connectors/n-type.html

Hi Gedas. I'm in the same quandary with my 26.5 GHz 8563E.? I'm thinking that if it was designed to meet a government contract requirement like I think my unit was, the N connector might have been

Interesting. What types of settings are stored in that SRAM? so far I did not manage to store calibration (open short load). It is always lost when the instrument is switched off. Just checked it:

Hi Tobias, I didn't check what's stored in the 4195A SRAM, but for the 4194A, some user calibration data (as when you cal a VNA with a cal kit) and also some setup configurations (you can store of

The reason I asked for a picture of the damaged connector was to determine if it was really damaged, or just a female APC3.5 missing the usual M-M connector saver that might be reasonably assumed to

To address what Greg Muir stated, that's why I use the guitar tuner. I can 'hear' when the WWV signal fades away because the beat frequency of 440 hz goes away and the tuner needle will leave center,

Thanks - I did not know that Quoting Frédéric BARTOLI <fred.bartoli@...>:

If you look carefully at the diagram, HP has built the 4195 so that the unit will not boot if the charging voltage is high or the battery voltage is low. There is a narrow window around 2.4 volts