开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
Re: Manual for HP 466A amplifier
Thanks David!? ? I replied to Jeremy.
By WB2UAQ · #150575 ·
Re: Manual for HP 466A amplifier
Thanks Jeremy!? ?A scanned copy of the schematic diagram would be much appreciated. My email is wb2uaq@.... ( wb2uaq@gmail ) Maybe I can scan in something for you from my collection of manuals
By WB2UAQ · #150574 ·
Re: HP Agilent 8753ES VNA repair [Help]
VNA parameters used ?: - Frequency center 100 MHz - SPAN zero mode TP20 (VCO): RF signal is at 39.100 MHz, -1.3 dBm instead of 39.840 on your board for frequency >16 MHz *seems KO ?* RF signal is at
By MattSNE · #150573 ·
Re: HP 3403C True RMS Voltmeter display fault
Hey Dave, According to the manual they're actually both electrolytics. Thanks for you kind word! Arnaud.
By AArnaud · #150572 ·
Re: HP Agilent 8753ES VNA repair [Help]
OK, great, thank you. I will compare my your measurement on my A12 board.
By MattSNE · #150571 ·
Re: Manual for HP 466A amplifier
Artek manuals also have a pdf available for the 466A 00466-90002 ; https://artekmanuals.com/manuals/hp-manuals/ David
By factory · #150569 ·
Re: HP Agilent 8753ES VNA repair [Help]
Test for CW 100 MHz.
By Yves Tardif · #150568 ·
Re: HP Agilent 8753ES VNA repair [Help]
There are some TP to verify on A12 board. Test for high frequency only for now. CW FREQ >16MHz De :
By Yves Tardif · #150567 ·
Re: HP Agilent 8753ES VNA repair [Help]
I tried to apply a 10 MHz external reference 1VPP and the problem is the same.
By MattSNE · #150566 ·
Re: HP Agilent 8753ES VNA repair [Help]
If we focus on the high band for now, 3 sources are involved: the 10 MHz reference, the 40 MHz VCXO and a VCO near 40 MHz (39.996 MHz). Check your 10 MHz reference. Measure the TP VCO
By Yves Tardif · #150565 ·
Re: HP 3403C True RMS Voltmeter display fault
That solder-looking ball is metallic tantalum that melted and burst through the outer shell of the capacitor. This is a classic failure mode for a shorted tantalum capacitor, usually the "dipped"
By Dave McGuire · #150564 ·
Re: HP Agilent 8753ES VNA repair [Help]
PLL 2 is 977 KHz instead of 996 Khz. I have a delta of 19 KHz on PLL on high band. This explain why the IF on A10 is 23 KHz instead of 4KHz and do not pass the digital filter. Problem is common on
By MattSNE · #150563 ·
Re: HP 3403C True RMS Voltmeter display fault
Hello everyone, I'm glad to report the HP 3403C works again! I've replaced the duos of LDs A/D chips, but this was not enough to revive the unit. It kept blinking +1 although it had lost its
By AArnaud · #150562 ·
Re: HP Agilent 8753ES VNA repair [Help]
Yves, Thank you ! Here is what I measure ?for the PLL2 frequency on my unit. I was in SPAN zero mode, sweep time 10s 10 KHz : 731 KHz 100 Khz : 821 KHz 1 MHz: 1720 KHz 2MHz: 2720 KHz I am off for
By MattSNE · #150561 ·
Re: HP Agilent 8753ES VNA repair [Help]
Hi, This means that one of the PLLs does not have the right frequency. The frequency near 22.5kHz will not pass through the filters which are for 4kHz at the DIGITAL IF. You should check the
By Yves Tardif · #150560 ·
Re: Service manual scan post processing
Don't believe everything you read. There's a vast amount of misunderstanding and bad information about JPEG floating around; it has been that way for a very long time. This is a result of people
By Dave McGuire · #150559 ·
Re: HP Agilent 8753ES VNA repair [Help]
Can you advise me on what next board should I check ? Perhaps A12 reference board or A14 Fractional N board ? Thank you.
By MattSNE · #150558 ·
Re: Manual for HP 466A amplifier
I have a paper copy of the HP-466A manual, serial prefix 226, and could copy the schematic for you. Jeremy N6WFO [email protected]> wrote:
By Jeremy Nichols · #150557 ·
Hp8569B
I have acquired a HP8569B. It had a problem with the CRT X drive, after many hours it's now fixed. However the neg 40V psu then kept blowing its 40v fuse, ?the 2N6056 is was found to be ded on
By Raymond Brooks · #150556 ·
Re: E5052A Power On Test (3.3V Bus Supply)
It's all OK now, I took it apart and fixed it :) :) :) On the DSP/ADC module A3 the 5V rail is now 4.97V (was 4.70V typical) and the 3V3 rail is now 3.24V (was 2.97V and very drifty). I disassembled
By jmr · #150555 ·