Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- HP-Agilent-Keysight-Equipment
- Messages
Search
|
Re: 8640B External Reference
If you use 10 MHz as a clock for a DDS, then, you are just as well off using
a flip-flop. Your output will be just a 5 MHz square wave either way. Now if you were to multiply the 10 MHz up first, like even just doubling it to 20 MHz, then you will have easily exceeded Nyquist and you also have room to put in a nice filter for 5 MHz. Still, the best recommendation was the first one. Just divide by two and filter. You may not even need to filter as most counters use a square wave anyway. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of lothar baier Sent: Tuesday, November 20, 2007 5:37 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 8640B External Reference 5MHz was quite common back then, it had to do with the fact that 5MHz XO had a better phasenoise, you will also find 5MHz on many older rubidium and cesium beam standarts. You have basically two options, the first one is to just use a 2/1 frequency divider, you can find those at any semiconductor company fairly cheap, the other solution which is a bit more intricat is to use a DDS chip to generate your 5MHz out of a 10MHz XO "Richard W. Solomon" <w1ksz@earthlink. <mailto:w1ksz%40earthlink.net> net> wrote: After moving to Arizona I know have at least one of my GPS Stabilized Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 --------------------------------- Never miss a thing. Make Yahoo your homepage. |
|
Re: 8640B External Reference
J Forster
Easy. Take the 5 MHz, split it and mix it with itself. You may want a
toggle quoted message
Show quoted text
buffer amp to follow the mixer output. Mini-Circuits Labs has the parts you need. Best, John Richard W. Solomon wrote: After moving to Arizona I know have at least one of my GPS Stabilized |
|
Re: Hp141+8553B+8552B and HP8601A
lothar baier
Most likely this is not gonna work, its too inacurate, the 8601 is not synthesized and therefore will drift way too much
iw3sgg <iw3sgg@...> wrote: Hi HP people! A little post for us. I have a spectrum analyzer HP141T with IF plug HP8552B and HP8553B. The spectrum analyzer cover 0-110Mhz or 0-11Mhz. I have a sweep generator HP8601A that sweep from 0-110 or 0-11Mhz. Is possible to connect the sweep generator to analyzer for measure filters like a tracking generator??? I connect the sweep out of HP8601A to scan in/out of HP8552B and I switch the SCAN MODE to EXTernal. I connect the out RF signal of HP8601A to DUT (device under test like a crystal filter) and from DUT I go to spectrum analyzer. The result is that the screen of HP141 move to the right of about 2-3cm. Why?? Is like that the spectrum analyzer can't pursue the sweep signal. Someone of us have same idea? Is possible to use HP8601A Swepper to measure filters with HP141T like a tracking generator??? Thanks for repply and I'm sorry for bad english,I'm in Italy..... Best regards. --------------------------------- Be a better sports nut! Let your teams follow you with Yahoo Mobile. Try it now. |
|
Re: 8640B External Reference
Dick,
toggle quoted message
Show quoted text
I've got a new Spectracom 8140T frequency distribution "Tap" module that takes 10 MHz in, buffers it, divides it by 2, then filters the output back to a sine wave. 12 VDC "phantom power" also is applied to the 10 MHz input port. If you don't find a better solution, figure 40 bucks plus shipping. No hurry, I have several and they won't disappear anytime soon. Regards, Tom ----- Original Message -----
From: "Richard W. Solomon" <w1ksz@...> To: <hp_agilent_equipment@...> Sent: Tuesday, November 20, 2007 5:16 PM Subject: [hp_agilent_equipment] 8640B External Reference After moving to Arizona I know have at least one of my GPS Stabilized |
|
Re: 8640B External Reference
lothar baier
5MHz was quite common back then, it had to do with the fact that 5MHz XO had a better phasenoise, you will also find 5MHz on many older rubidium and cesium beam standarts.
You have basically two options, the first one is to just use a 2/1 frequency divider, you can find those at any semiconductor company fairly cheap, the other solution which is a bit more intricat is to use a DDS chip to generate your 5MHz out of a 10MHz XO "Richard W. Solomon" <w1ksz@...> wrote: After moving to Arizona I know have at least one of my GPS Stabilized Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 --------------------------------- Never miss a thing. Make Yahoo your homepage. |
|
HP-5245L Plug-Ins
David C. Hallam
I acquired a box full of plug-ins for my 5245L counter and have a couple of
questions. 1. 5253B 50-500 MHz heterodyne oscillator The left most digit is not displayed. i.e., 62.567 is displayed as 2.567. Is this the way it's supposed to work? 2. 5257A Transfer Oscillator I can't find anything on the internet about how to use it. I certainly don't want to spend any money on a manual until I find out if it works and if it will be useful to me. Can some one give a quick course in how to use it. David KC2JD/4 |
|
8640B External Reference
Richard W. Solomon
After moving to Arizona I know have at least one of my GPS Stabilized
Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 |
|
Re: Hp141+8553B+8552B and HP8601A
Sorry, the sweep calibration is much too inaccurate
toggle quoted message
Show quoted text
to use 8601A+8553B as a tracking generator. To use 8601A as a TG, it must be Option 007, and your RF module must be an 8553L, not an 8553B. You need an 8443A or 8443B. Regards, David Wise -----Original Message----- |
|
Re: HP 35677A S-Parameter Test Set
Yes that would help..I just need to know what the little board inside
is doing. Most of the enclosure is empty, so I have lots of space to put a single board compute with some extra hardware. Yes I am aware of the discussion you mentioned....but I got the full S parameter test set for about $150 very cheap. Please send it to: isaac.martinez at sbcglobal dot net Thank you --- In hp_agilent_equipment@..., "Martin Fischer" <Martin.Fischer@...> wrote:
|
|
Hp141+8553B+8552B and HP8601A
iw3sgg
Hi HP people!
A little post for us. I have a spectrum analyzer HP141T with IF plug HP8552B and HP8553B. The spectrum analyzer cover 0-110Mhz or 0-11Mhz. I have a sweep generator HP8601A that sweep from 0-110 or 0-11Mhz. Is possible to connect the sweep generator to analyzer for measure filters like a tracking generator??? I connect the sweep out of HP8601A to scan in/out of HP8552B and I switch the SCAN MODE to EXTernal. I connect the out RF signal of HP8601A to DUT (device under test like a crystal filter) and from DUT I go to spectrum analyzer. The result is that the screen of HP141 move to the right of about 2-3cm. Why?? Is like that the spectrum analyzer can't pursue the sweep signal. Someone of us have same idea? Is possible to use HP8601A Swepper to measure filters with HP141T like a tracking generator??? Thanks for repply and I'm sorry for bad english,I'm in Italy..... Best regards. |
|
Re: 3325A A-Cal Failed.
Hi,
toggle quoted message
Show quoted text
I have repaired a few 3325a synthesizers. I have found that the Sample /Hold switches U20 and U24 have been broken. These are quad devices, only three channels are used in each application. Sometimes swapping them will fix the problem. If you have a manual check service group I The part is an LF13331D. The part is obsolete. A similar, inter-changeable part is used in the 3336 synthesizer/level generators. Good luck !! John Barnes ---------- Original Message ----------------------------------
From: John Day <johnday@...> Reply-To: hp_agilent_equipment@... Date: Tue, 20 Nov 2007 09:15:50 -0500 At 09:02 AM 11/20/2007, you wrote:Hello All,It has been obsolete for some time. ________________________________________________________________ Sent via the WebMail system at aztec-net.com |
|
Microwave Circuit boards
microwaveengineer1968
Im building up some spare parts for my testequipment right now, problem
is that with Rogers materials most PCB houses go by the panel, the panel cost is about $400ea for RO4350B with 0.5mm dielectric (0.020) in addition it would yield about 100boards when i really only need 10 I thereby encourage anyone who is currently pondering a project but is faced with the same dilemma to contact me at microwaveengineer1968@..., maybe we can "PCB POOL" the only requirement is that the board has to be on RO4350B 0.020 dielectric 20oz copper. |
|
Re: 3325A A-Cal Failed.
lothar baier
try , they are not cheap, about $5 ea
Mark <marks@...> wrote: Hello All, I am having trouble tracking down a MC1495 or SG1495 or 1826-0437. Its a 'wideband linear 4-quadrant multiplier' used in the AM and Amplitude levelling in a 3325A. Does anyone sell this chip anymore? Is there a functional / electrical equivalent? Best regards, Mark. PS I have 3x A3 boards, all with the same problem! Symptom is A-Cal fail, All 3 self test fail. The voltages around this IC are all wrong. mcs --------------------------------- Get easy, one-click access to your favorites. Make Yahoo! your homepage. |
|
Re: 3325A A-Cal Failed.
John Day
At 09:02 AM 11/20/2007, you wrote:
Hello All,It has been obsolete for some time. Although I have never tried this trick in a 3325A, I have used the Analog Devices AD633 (readily available from DigiKey and others) in other applications where I originally used the MC1495. It might be worth some investigation. I don't think I have the schematics of the 3325A, but if you can post or email me the appropriate section I can try to sketch something out for you. John Day Toronto Is there a functional / electrical equivalent? |
|
Re: 3325A A-Cal Failed.
lothar baier
Have you tried ebay ?
Mark <marks@...> wrote: Hello All, I am having trouble tracking down a MC1495 or SG1495 or 1826-0437. Its a 'wideband linear 4-quadrant multiplier' used in the AM and Amplitude levelling in a 3325A. Does anyone sell this chip anymore? Is there a functional / electrical equivalent? Best regards, Mark. PS I have 3x A3 boards, all with the same problem! Symptom is A-Cal fail, All 3 self test fail. The voltages around this IC are all wrong. mcs --------------------------------- Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. |
|
3325A A-Cal Failed.
Mark
Hello All,
I am having trouble tracking down a MC1495 or SG1495 or 1826-0437. Its a 'wideband linear 4-quadrant multiplier' used in the AM and Amplitude levelling in a 3325A. Does anyone sell this chip anymore? Is there a functional / electrical equivalent? Best regards, Mark. PS I have 3x A3 boards, all with the same problem! Symptom is A-Cal fail, All 3 self test fail. The voltages around this IC are all wrong. mcs |
|
Re: 35677A service/ internal diagram.
Planning to use mini-circuits
ZASWA-2-50DR 1.- Yes it is absorptive type i.e 50 ohm terminated 2.-The switch is DC coupled, so LF does not seem to be a problem... likely it is not PIN based. 3.- Isolation is about 90 db in the range of interest... it will never beat the 100 dB of a mechanical switch but it will last almost forever....besides that I think I can take care of the isolation with a 12 term 2 port correction. Given that the 3577A can not do that type of correction. a.) the original switch terminates the unused arm in 50ohm, thiscondition needs to be fullfilled by your solid state switch as well ! poor low frequency performance, pin switches are even worse, the solid state switch used in the 85046A for example exhibits poor RF characteristics below 100KHz datasheet of the Agilent 8763A (this is what they used) your Solid state switch needs to be equal or better ! set? All I need to know is what the pin out of the little connector onthe back?analyzer. homepage. |
to navigate to use esc to dismiss