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- HP-Agilent-Keysight-Equipment
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Re: ROM / EEPROM firmware dump
Whoa...slow down!? I just sent it to him a few hours ago.? You need to wait until the owner has had some time to think about it, play with it,? and then decide how to deal with it, where to put it, and how to advertise it.? If you are in need of a keyword, then let me know.
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Re: HP435 measuring head?
Hi All, Over the years I've collected a fair bit of test equipment. I'm lucky enough to have 3 HP sensors and four different HP power meters as well as some good quality attenuators that allow me to measure power to 18GHz and up to 50W. None of it has been calibrated for years yet all four meters and three sensors agree to within 0.1dBm of each other when measuring their internal references or other signal sources up to 10GHz. These results are repeatable in another radio shack with similar equipment. That makes 6 meters and six sensors all behaving in a similar way.? I would say that gives my friend and I a good degree of confidence that the readings we make are valid. I can't say the same for bird meters or any (insert brand name here) power meters with HF thru UHF capability but as someone else said, these meters are in a different class not to be confused with the HP style meters and sensors. Of course, my equipment has no calibration traceability but I'm a ham and I don't need it for a hobby. My gear can meet Rob's +/-1dB requirement easily and I'm sure most sensors that are sold as working perform as expected. I've only purchased one bad sensor and it was pretty obvious it was crook?(wavering reading on the internal reference) as soon as I started using it. Money was refunded immediately. When it comes to cost, I'd argue that hams spend more money on a single radio than the cost of a HP meter with cable and sensor. Anyway, I like my equipment and for those that want to buy similar I'd say go for it. Regards Lou VK3ALB On Thu, Oct 8, 2020 at 6:33 AM nigel adams via <bristol.rell6l=[email protected]> wrote:
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Re: HP435 measuring head?
Same here. I miss that.
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Thanks, Barry - N4BUQ ----- Original Message -----
From: "Dave McGuire" <mcguire@...> |
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Re: ROM / EEPROM firmware dump
开云体育What is the name of the program so I could look for it by name? Otherwise there are slim chances I could find it - ko4bb is vast.? 2 okt. 2020 kl. 1:36 fm skrev Caesar Valenti <caesarv@...>:
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Re: ROM / EEPROM firmware dump
开云体育Please upload the source code project somewhere, or even email it to me personally. I can post it to GitHub for you if you wish, and also set up a GitHub page that will compute the codes in the browser so the whole “application” will be a single html file that you open in a web browser and that’s that. Simple stuff once the algorithm is known. I can literally pull it off this evening (eastern time) since I got time for it. It won’t need any sort of a server to work: anyone can download the html and it’ll be the complete thing, and it will be tiny - a few kilobytes, no kidding. Web browsers are powerful enough that you could boot an emulated Wine session right in the browser and run the VB5 executable that way, but not much point to it since it’s not like preserving a game or something where the original visuals are important.? Cheers, Kuba Sunderland-Ober 2 okt. 2020 kl. 1:36 fm skrev Caesar Valenti <caesarv@...>:
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Re: HP435 measuring head?
开云体育Can you say what model it is?One of my most treasured items is a "Sanders" slotted waveguide measuring line. The quality of construction and sheer mechanical precision makes it a wonderful thing in its own right. Do you have a manual for it? There is a selection of Sanders uWave and other instruments plus all the drawings and catalogues of the period when Marconi acquired the business in the Marconi Instruments Heritage Collection... On 7 Oct 2020, at 18:59, Robin Szemeti <robin@...> wrote:
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Re: HP435 measuring head?
On 10/7/20 1:30 AM, Roy Thistle wrote:
On Sun, Oct 4, 2020 at 03:27 PM, Robin Szemeti wrote:You are confusing the usual HP power meter, which reads from about -30 dBm to +10 dBm with a Bird or Daiwa, which read from maybe 5 Watts to about a kilowatt, depending on plug-ins or model. Two different animals, completely. BTW, I find, in my small sample of two Daiwas and one MFJ, compared to a Waters Dummy-Load Wattmeter, the Daiwas are more accurate. --doug, WA2SAY, retired RF engineer |
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Re: ROM / EEPROM firmware dump
I have sent the program to KO4BB.? Not sure what he will do with it, but at least someone else has it in case I get Covid-19 or get caught up in one of our many fires here in Sonoma county.? The fire two weeks ago, which destroyed about 700 structures (the Glass fire), came within 3000 feet of me.? I also privately sent it to one other person in this group. |
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Re: HP435 measuring head?
开云体育This is a real interesting thread. So I thought I’d throw in my two centsA SA is not a power meter..... ?actually it is and in some respects a better one. ?True you do have the issues of calibration but assuming you are calibrated you should be able to get within a couple of tenths of a dB. Where the SA shines over a power Peter is that you are measuring the power at your frequency of interest not the fundamental and all of its harmonics like a PM or a bird does. Calibration, ?well I have had to do inspections (why they let me do QA inspections is beyond me) and I have found exactly two labs that could actually put stickers on power heads with a straight face one was HP Roseville (a while back) where they had the 4 or 5 racks of stuff for PMs and Heads. The other was of all places the Pakistani Navy lab in Karachi. They had HPs desktop sets for both PMs and heads. ?Everyone else used a sig gen to verify the heads and none of them did the entire frequency range nor the math to generate the Cf. ? I’m lucky I have the 11683 range calibrator and a Keysight lab stds calibrated 3458A so I can be fairly certain that my power meters are correct, operative word “fairly”.? Over the last year or so I have had over a dozen 436As up from one of my customers because they “wouldn’t cal” or were BER, they all got sent back working because I actually read the manual and performed the alignment (with the 11683). ? The bottom line unless you really know your lab and even then that they actually do alignments everything we have is a guess, maybe a good guess, but still just a guess.? Remember in radio it takes 6dB ?for you or me to detect a change in the signal. ?Of course if you’re doing it as a challenge that’s another thing. Regards, ? Stephen Hanselman Datagate Systems, LLC On Oct 7, 2020, at 10:59, Robin Szemeti <robin@...> wrote:
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Re: HP435 measuring head?
开云体育But I bet the newer model produced more heat to warm your tush! ;) Jim Ford? Sent from my Verizon, Samsung Galaxy smartphone -------- Original message -------- From: Wilko Bulte <wkb@...> Date: 10/7/20 10:44 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP435 measuring head? |
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Re: HP435 measuring head? kW's?
They all have their place ...? a Bird thruline is essential gear on a hilltop UHF or VHF site ... a 435 is perfect on the bench with the internals of a transverter ... horses for courses. My 432MHz? transmitters have calibrated sampling ports on an SMA with around -45dB of coupling, perfect for attaching to a 435 and a head with a suitable attenuator. On Wed, 7 Oct 2020 at 18:43, Tom Holmes <tholmes@...> wrote: One other point regarding the contention that power meters are not very |
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Re: HP435 measuring head?
Lockdown has been brilliant for hobbies!? I hadn't fired up a transmitter in decades having been out of the hobby for a long time ... now I find myself knee deep in gear again, with a shed full of heliax, aerials and part finished projects. Good test gear is however a joy in itself.? I have a good stock of mechanical tooling and a small workshop, a good vernier or micrometer is a joy to use whereas a poor instrument is a frustration.?? I enjoy acquiring good test equipment, even if sometimes I have no real use for it.? One of my most treasured items is a "Sanders" slotted waveguide measuring line. The quality of construction and sheer mechanical precision makes it a wonderful thing in its own right. On Wed, 7 Oct 2020 at 18:39, Dave McGuire <mcguire@...> wrote: On 10/7/20 1:33 PM, Jim Ford wrote: |
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hp laser printer repair group?
I've been an instrument tech for most of my life, but once in a while have to work on a HP Laser printer.? Does anybody know of a group that covers these repairs?? I've searched groups.io, no luck, or I'm looking for the wrong thing.? I've left most of the yahoo groups behind.
Jim |
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Re: HP435 measuring head?
On 10/7/20 1:44 PM, Wilko Bulte wrote:
Cray... I got to sit on one. At Shell here in NL. They were complaining their new Cray was less comfy than the previous model. Less padding ?That was real leather in the commercial machines. But some US Gov't departments had restrictions on purchasing animal hide products, so Cray offered Naugahyde coverings over the power supply/coolant pump "bench" as an option for them. Now we're getting very much off-topic.. -Dave -- Dave McGuire, AK4HZ New Kensington, PA |
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Re: HP435 measuring head? kW's?
One other point regarding the contention that power meters are not very
accurate. Keysight and every other reputable Sig Gen maker, uses a power meter as the traceable to NIST device for calibration of power output. If it's good enough for them... Granted, you can argue about resistive vs. thermocouple vs. Diode detector accuracy, but it ain't much of a difference. Tom Holmes, N8ZM |
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Re: HP435 measuring head?
开云体育I have the same problem, Tam.? Too much work and not enough time for hobbies like ham radio.? Jim Ford? Sent from my Verizon, Samsung Galaxy smartphone -------- Original message -------- From: Tam Hanna <tamhan@...> Date: 10/7/20 9:28 AM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP435 measuring head? Well. Back to the old topic...of why you buy what. I tend to "overspec" - both in test kit and in general stuff. But, work often prevents me. It's a pity...wanted to do some HAM stuff, but literally never made it on air. Just so much other things to do. Tam With best regards Tam HANNA (emailing on a BlackBerry PRIV) Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at Am 7. Oktober 2020 18:23:46 MESZ schrieb Robin Szemeti <robin@...>:
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Re: HP435 measuring head?
开云体育I do not know what the situation is in Europe but I know that here in the states there has been a seismic shift in telecommunications.? I do not have a ham license but have been following it with some interest for a long time.? For probably 30 years after the war, the majority of people here used TV antennas and radios for entertainment.? Especially in urban areas they were very sensitive to rf interference from transmitters, ham and otherwise.? Cable TV, Internet, music downloads and cellphones have changed all that.? There are far fewer people here who even know what is going on in the rf spectrum to have any complaints.? That probably explains the perceived lack of enforcement. Jack Reynolds On 10/7/2020 12:39 PM, Robin Szemeti
wrote:
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Re: HP435 measuring head?
On 10/7/20 1:24 PM, Kuba Ober wrote:
Hah, I’d love a scrap Cray I for its ECL nand gates and RAM – perfect if you want to do anything in that technology, all the building blocks are there to just pull and reuse.You won't find any, unfortunately. And if you did, building it up is a much better idea than tearing it down. We wouldn't melt down a "scrap" Model T Ford for a few pounds of steel, either. Are old Motorola ECL chips really that hard to find now? I used to see them everywhere. -Dave -- Dave McGuire, AK4HZ New Kensington, PA |
Dave McGuire
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