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Re: 8640B External Reference
www.tonnesoftware.com
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hes got some interesting stuff on his site a fellow ham i own a copy of his meter software but havent used it yet i looked at a pdf of the 8640b that i own 2 of both of my 8640b generators came to me needing repair from a guy who bought 3 of them and then sold me the 2 broken ones. it looks to me from viewing the circuit that the 8640b would work just fine using a square wave input the input amp looks to me like a transistor buffer with a little bit of hysterisis feedback to prevent noise multiple pulses you shoul;d see how i type 1 hand on the mouse and the other 1 fingering the keyboard. the 5 mhz oscillator drives a gate that gates the output of the oscillator and when the gate is disabled the 10 mhz output bnc can be used to jam a signal into the 1 transistor buffer. since the output of the buffer drives a divide by 5 chip i guess the system internally only requires 1 mhz i wonder if playing with the jumpers which arent shown on the schematic i looked at would still allow it to operate on the internal tcxo with just the flip of a switch?? from what i read dick has a very impressive toy collection. far superior to mine that i can barely afford. ----- Original Message -----
From: John Miles To: hp_agilent_equipment@... Sent: Wednesday, November 21, 2007 4:16 PM Subject: RE: [hp_agilent_equipment] 8640B External Reference Well, to be fair to Arthur, we can quibble with the presentation, but he's right. (I've always assumed he's using a handicap-accessible input device of some kind.) You asked how to run an 8640 from a 10-MHz house clock. He told you how you could do it. And yes, in a Utopian world one would be able to answer this question at the General-class level. No need to attack someone who's just trying to help, is there? That said, I don't bother to run my own 8640 from an external clock at all, since its internal standard is already a good match for the precision of its counter display and locking mechanism. -- john, KE5FX > > I see your reputation for off-handed comments is well deserved. > Too bad you have no clue what you are talking about and I don't > wish to explain it to you. > > 73, Dick, W1KSZ/7 > > -----Original Message----- > >From: arthurok <arthurok@...> > >Sent: Nov 20, 2007 7:01 PM > >To: hp_agilent_equipment@... > >Subject: Re: [hp_agilent_equipment] 8640B External Reference > > > >a flip flop and simple low pass if needed is too > much for an extra class ham to build up?? > |
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3 pin connector search
wb5kye100
Hi -
I'm looking for a source of the small 3 pin connectors (female and male) which were used on active rf probes for supplying power. Most of the vintage HP gear (network analyzers, spectrum analyzers) had a panel mount male connector for supplying +/- DC power. I've got a couple of homemade active RF probes that I plan on using with some HP equipment and want to use some of these connectors. I think that Tek used these same connectors. Anyone know the brand and where I may find some? Thanks Jim WB5KYE |
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Re: 8640B External Reference
John Miles
Well, to be fair to Arthur, we can quibble with the presentation, but he's right. (I've always assumed he's using a handicap-accessible input device of some kind.) You asked how to run an 8640 from a 10-MHz house clock. He told you how you could do it. And yes, in a Utopian world one would be able to answer this question at the General-class level. No need to attack someone who's just trying to help, is there?
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That said, I don't bother to run my own 8640 from an external clock at all, since its internal standard is already a good match for the precision of its counter display and locking mechanism. -- john, KE5FX
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Re: Hp141+8553B+8552B and HP8601A
Lothar thought that you wanted to drive one instrument with
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the other's scan ramp voltage. That would be a failure. If you can get the 8553's 1st LO into the 8601A, then it might be good enough. That's how HP did it before they built the 8443A and changed from the 8553L to the 8553B. What you lose with the old combination, is the Fine Tuning control and narrow scan width. As long as you can use >20kHz scan width, and you don't mind not having a digital frequency readout, it's almost as good as the 8443A. Regards, Dave Wise -----Original Message----- |
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Re: Hp141+8553B+8552B and HP8601A
Noris Battaino
lothar baier <microwaveengineer1968@...> wrote: Most likely this is not gonna work, its too inacurate, the 8601 is not synthesized and therefore will drift way too much
.. Thanks Lothar for repply. I'm afraid because I cant' measure HF filters (0-30Mhz). Best regards. Noris. --------------------------------- Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. |
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Re: Hp141+8553B+8552B and HP8601A
Noris Battaino
David Wise <david_wise@...> wrote: The 8553B does not have a LO output jack, only the 8553L does.
To use a non-option 007 8601A with the 8553B would require 8601A modifications and a special cable to connect to the 141T. Regards, Dave Wise Thanks for repply . _,_._,___ Thanks for repply Dave....I have understand that with my hp8601 and my 8553B I can't measure filters like my tracking HP8444 and HP8555A!!! I'm afraid. Thanks again! Best regards. iw3sgg --------------------------------- Be a better sports nut! Let your teams follow you with Yahoo Mobile. Try it now. |
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Re: Hp141+8553B+8552B and HP8601A
The 8553B does not have a LO output jack, only the 8553L does.
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To use a non-option 007 8601A with the 8553B would require 8601A modifications and a special cable to connect to the 141T. Regards, Dave Wise -----Original Message----- |
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Re: Hp141+8553B+8552B and HP8601A
iw3sgg
--- In hp_agilent_equipment@..., "jaking" <jaking@...> wrote:
Hi ZL4AI, Thanks for repply. I'm looking the manual and I'm looking the HP8601.....I havent the option 7. I have only a VTO OUTPUT connector,the LO INPUT connector is not mounted on the rear pannel. If I read right I must connect the first LO OUTPUT op spectrum analyzer (HP8553B) to the LO INPUT of HP8601A. It is correct?? For you is possible to modify my HP8601A to ADD the 7 option?? Now I'm reading the manual from bama site. Thanks for repply again. Best regards. iw3sgg |
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Re: Hp141+8553B+8552B and HP8601A
The 8601A employs the same mixing strategy as the 8553,
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with a 200-310MHz 1st LO. Option 7 adds rear-panel jacks to the 8601A to accept the 8553L's 1st LO output in place of the 8601A's internal 1st LO. You have to adjust the 8553's Fine Tuning control to center the TG in the SA RBW, and you can't use narrow sweeps, which tune the 8552's 47MHz LO instead of the 200-310. Dave Wise -----Original Message----- |
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Re: Hp141+8553B+8552B and HP8601A
jaking
Look in the 8601a manual (read Option 7).
There is provision to take control signal from the 8601, and use that to control the spectrum analyzer. The frequencies between the analyser and the 8601a are the same. Yours sincerely ZL4AI _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of lothar baier Sent: Wednesday, 21 November 2007 11:47 a.m. To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] Hp141+8553B+8552B and HP8601A Most likely this is not gonna work, its too inacurate, the 8601 is not synthesized and therefore will drift way too much iw3sgg <iw3sgg@yahoo. <mailto:iw3sgg%40yahoo.com> com> 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. Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.15.30/1126 - Release Date: 12/11/2007 12:56 p.m. |
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Re: 8640B External Reference
Richard W. Solomon
I found where the jumpers are located, thanks again.
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The answer that I was looking for. 73, Dick, W1KSZ/7 -----Original Message-----
From: "Richard W. Solomon" <w1ksz@...> |
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Re: 8640B External Reference
Richard W. Solomon
Thank you, I will look into that.
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73, Dick, W1KSZ/7 -----Original Message-----
From: k1ggi <k1ggi@...> |
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Re: 8640B External Reference
Richard W. Solomon
I see your reputation for off-handed comments is well deserved.
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Too bad you have no clue what you are talking about and I don't wish to explain it to you. 73, Dick, W1KSZ/7 -----Original Message-----
From: arthurok <arthurok@...> |
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Re: Anyone know if these movies still exist
Harvey White
On Wed, 21 Nov 2007 22:17:57 +1100, you wrote:
They made movies? Wow Uber geeks!! I'd love to see them - I could xferI am in Florida. For those in Au or the like with PAL, I could (I think) make PAL DVD's or just make the files available by DVD, if they're not too large. Harvey
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Re: Anyone know if these movies still exist
swingbyte
They made movies? Wow Uber geeks!! I'd love to see them - I could xfer to dvd - but Australia is a long way to ship such precious tapes.
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Harvey White wrote:
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Re: 8640B External Reference
k1ggi
The 8640B external reference can be configured to accept a 1MHz input,
but the jumpers are deeply buried in the time-base module on A8A3. It is not necessary for the reference to be a sinusoid. It is first attenuated and then amplified before being fed into a logic gate, which feeds the counter chain. The internal oscillator always runs and there can be some weak crosstalk that beats the internal with the external reference, which can show up when they are very close in frequency as very close-in spurs. 73, Ed, K1GGI --- In hp_agilent_equipment@..., "Richard W. Solomon" <w1ksz@...> wrote: effort to try and supply an external reference to the 8640B, yes ??rear, internally selectable for 10, 1, .1, .01 MHz and 1 pps outputs. I guess I'll just use oneto supply the counters.
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Re: YIG cross-reference
lothar baier
the first digits filled up with 0s usually lead to the unit, for example 08360-xxxx is from a 8360 series
Geraldo Lino de Campos <geraldo@...> wrote: Usually there are HP YIG oscillators or filters at reasonable prices on EBAY, sometimes identified by the board number. It will be very interesting to know the instrument they fitted, to be able to know the specifications and eventually use the board with small changes. Is there a cross-reference from the board ID to the instrument number? Or can someone contribute with at least a few? -- ------------------------------------ Geraldo geraldo@... --------------------------------- Never miss a thing. Make Yahoo your homepage. |
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Re: 8640B External Reference
i own a copy of his meter software the filter software is free for the limited versions which is all i ever used for my projects. and are very easy to use "i hate doing math" ----- Original Message -----
From: lothar baier To: hp_agilent_equipment@... Sent: Tuesday, November 20, 2007 5:58 PM Subject: RE: [hp_agilent_equipment] 8640B External Reference sorry i wasnt to clear on that, the DDS i was refering to actually has a clock multiplier build in that allow a max of 30MHz i think. Mike Feher <n4fs@...> wrote: 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. --------------------------------- Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. |
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YIG cross-reference
Usually there are HP YIG oscillators or filters at reasonable prices
on EBAY, sometimes identified by the board number. It will be very interesting to know the instrument they fitted, to be able to know the specifications and eventually use the board with small changes. Is there a cross-reference from the board ID to the instrument number? Or can someone contribute with at least a few? -- ------------------------------------ Geraldo geraldo@... |
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Re: 8640B External Reference
a flip flop and simple low pass if needed is too much for an extra class ham to build up??
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----- Original Message -----
From: Richard W. Solomon To: hp_agilent_equipment@... Sent: Tuesday, November 20, 2007 7:56 PM Subject: Re: [hp_agilent_equipment] 8640B External Reference So basically what you are telling me is that it is not worth the effort to try and supply an external reference to the 8640B, yes ?? I have two TrueTime XL-AK GPS Receivers that have 5 outputs on the rear, internally selectable for 10, 1, .1, .01 MHz and 1 pps outputs. I guess I'll just use one to supply the counters. Thanks for the replies. 73, Dick, W1KSZ/7 -----Original Message----- >From: lothar baier <microwaveengineer1968@...> >Sent: Nov 20, 2007 5:08 PM >To: hp_agilent_equipment@... >Subject: Re: [hp_agilent_equipment] 8640B External Reference > >One thing need to be made clear however, the external timebase will not affect the frequency stability in normal operating mode since it is only used for the frequency counter, if you push the phaselock button then it will lead to an increased stability of the signal. > Another possibility is to get a 5078A distribution amplifier which would be usefull since he wants to drive some other counters and stuff as well, as far as i know HP made cards to go in those that allowed for a 5MHz or 1MHz output, anyway a 2/1 divider is easy enough to build, you can use TTL or just go to hittite and buy a part for about $2, lowpass filters are wasy to build or you can get a little monolithic one from coilcraft or mini circuits > > > as he says a low pass filter will produce a quasi sine wave "gaussian responce" >----- Original Message ----- >From: lothar baier >To: hp_agilent_equipment@... >Sent: Tuesday, November 20, 2007 5:58 PM >Subject: RE: [hp_agilent_equipment] 8640B External Reference > >sorry i wasnt to clear on that, the DDS i was refering to actually has a clock multiplier build in that allow a max of 30MHz i think. > >Mike Feher <n4fs@...> wrote: 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. > > > > > >--------------------------------- >Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. > > > > > > > > > > >--------------------------------- >Get easy, one-click access to your favorites. Make Yahoo! your homepage. > > > > > > >Yahoo! Groups Links > > > |
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