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Hp Schottky diode HP QSCH 1691 ( or HPQSCH-1691 ?) ... Data Sheet wanted
Can't find any info on this Hp QSCH 1691 ( Schottky ) diode. It does not seem to be mentioned in either of the 1972, 1980, nor 1984 Hp Diode & Transistor Designer's Handbooks. Anyone have a .pdf
By gren · #146518 ·
8566B Calibration
Hi all, The calibration procedure for this analyzer states that something called "AMPDT CAL" requires adjustment. However, I can find no such button on my particular analyzer. Everything else the
By Jinxie · #146517 ·
Re: Crystal detector with 10dB attenuator in series - is it for matching purposes?
Saevar, One reason for the attenuator may be to provide a DC path to ground.? Many detectors require this, and some RF sources are AC coupled. --John Gord
By John Gord · #146516 ·
Re: HP 141T Power Supply Help Needed
Bill, It sounds like you are on the right track! So find out were the .04Ohm wire goes¡­ Mike Sent: Saturday, August 31, 2024 2:29 PM To: [email protected] Subject:
By Michael Bafaro · #146515 ·
Re: HP 141T Power Supply Help Needed
Neat trick checking for shorts. As you expected probably, 0.04ohm. I have found one purple/white wire which when removed brings that up to 384 ohm. I'll be out of pocket for a day but will look
By Bill Berzinskas · #146514 ·
Crystal detector with 10dB attenuator in series - is it for matching purposes?
I was reading about the crystal detector HP 8473C and in the performance test section in the documentation, it is recommended to use 10dB isolation attenuator in series with the RF port and adjust the
By saevar · #146513 ·
Re: HP 5086-7906 YTO
Yves, thank you very much for all the suggestions and information with which I will continue my investigation In the meantime I received the 2.5mm socket wrench and after a little mod to adapt it for
By alfa beta · #146512 ·
Re: HP 141T Power Supply Help Needed
Bill, So you replaced the pass transistor and Q9 then it popped the 3A fuse F4. And at that point the regulator worked but there must be a short on the -12.6V buss. Please run an Ohm meter check
By Michael Bafaro · #146511 ·
Re: 16901A 16901-14102 recovery disc ISO wanted (was Re: [HP-Agilent-Keysight-equipment] Wanted: 16902B recovery DVD, p/n 16902-14100)
Maybe only on certain interfaces? There's definitely nothing wrong w their configuration when you're close (network and latency-wise) to them. I mean, they often saturate the SSD disk writing
By Keith Monahan · #146510 ·
Re: 16901A 16901-14102 recovery disc ISO wanted (was Re: [HP-Agilent-Keysight-equipment] Wanted: 16902B recovery DVD, p/n 16902-14100)
I wonder whether internet archive simply has TCP 1323 window scaling options disabled or clamped to a low maximum, or something like path mtu discovery broken by blocking ICMP type 3 code 4 packet too
By Ed Marciniak · #146509 ·
Re: 16901A 16901-14102 recovery disc ISO wanted (was Re: [HP-Agilent-Keysight-equipment] Wanted: 16902B recovery DVD, p/n 16902-14100)
Here's the images I have https://www.dropbox.com/scl/fo/05b2wr6le685c1dacwnw9/AMi9MTuEqv4IDBUyAQY2004?rlkey=4e1yka1xbnkhx6iiclziecntq&st=37jkmd83&dl=0 File sizes and MD5sums -rwxr-xr-x 1 root root
By Keith Monahan · #146508 ·
Re: HP 141T Power Supply Help Needed
Those numbers just don't make any sense. I pulled all the transistors AGAIN, desoldered and cleaned. Tested them all with a meter, repopulate. Back to 23.5v.... [email protected]> wrote:
By Bill Berzinskas · #146507 ·
Re: HP 5086-7906 YTO
I forgot to send the mixer information. Blue wire, PIN SW: band0= +9.81v and band 1=-9.56V Green wire, BIAS: +3.9V Yves De : [email protected]
By Yves Tardif · #146506 ·
Re: HP 5086-7906 YTO
Hi Adri, sorry for not giving feedback earlier, I've been very busy this week, and the days have been very long. For band 0, if you have a signal at A3A3 output, but nothing at A3A6 output at
By Yves Tardif · #146505 ·
Re: HP 141T Power Supply Help Needed
Replaced Q9, powered on and blew the fuse. Replaced Fuse + Q9 again + pass transistor and no fuse pop. Not sure if better, worse or just different :-) Q9.. C = 22v B = 54v?! (was 23.5v) E =
By Bill Berzinskas · #146504 ·
Re: HP 141T Power Supply Help Needed
Bill, OK it seems that Q 9 has a base-emitter voltage of 38.5V which says that the base-emitter junction is open because a good NPN silicon transistor can only have a forward base-emitter voltage
By Michael Bafaro · #146503 ·
Re: 85097A VNA ECal controller replacement
Interesting project, have you made further progress with this? Did you manage to use the Arduino or are you still using the FTDI chip instead? Thanks Saevar
By saevar · #146502 ·
Re: Wanted HP-3586 A,B, or C
Hi Matt, Sorry for the late reply. I had not checked after I did get a chance to buy one. Price was too high for me. Fair Radio Sales had two for sale each for $450 with no takers for over a couple
By Jim Sorenson · #146501 ·
Re: HP 141T Power Supply Help Needed
I'd been trying to poke at this between work, so admittedly was a bit distracted. I did find the 2n3904 Q10 to be bad and have replaced. here is the full supply now that i've had some focus
By Bill Berzinskas · #146500 ·
Re: HP 141T Power Supply Help Needed
That does make sense, thank you for that explanation.. I do believe I've stated it backwards. 22v appears on a 2n3053 that I've replaced at pin 3, which is actually the collector..
By Bill Berzinskas · #146499 ·