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Re: Testing dummy loads with a VNA
I've also just discovered that any members' PMs to me on this subject have been accidentally deleted after being flagged as spam by my mail provider. If any of these are important enough, can the
By Jinxie · #103777 ·
Re: HP 8644 Phase Noise Problem and Repair
Nice schematic, easy to follow. I dont know this unit exactly, but some general suggestions for this very sensitive piece of gear: 1. This is an OLD (35-40 yrs.?) unit. The HP doc (Memory Project)
By David C <k_8_b_y_p@...> · #103776 ·
Re: Testing dummy loads with a VNA
Thanks to all for the responses since I last posted. I'm obviously in a different part of the world to most of you so apologise if it looked like I was ignoring any of you - I'm simply on different
By Jinxie · #103775 ·
Re: Testing dummy loads with a VNA
This application note, while for the 8505A, Covers RF test sets contempary to and usable with the 8754A http://hpmemoryproject.org/an/pdf/an_219.pdf It aslo covers the basic measurement and a bit on
By Robert G8RPI · #103774 ·
Re: Testing dummy loads with a VNA
Suggesting other VNA's to the OP is not helpful when they hasve already stated that they don't want to go there. Jinxie, I don't know what RF test set you were offered for $450 but for 90% of work a
By Robert G8RPI · #103773 ·
Re: Testing dummy loads with a VNA
I very much agree:? The 8712x, 8714x, and 8753x are all much more capable and convenient than the 8754A.? The ability to use any (reasonable) length cables makes a wide range of measurements much
By John Gord · #103771 ·
Re: Testing dummy loads with a VNA
Hmmm, I see what you mean. So here is my two cents worth. With a scalar analyzer (8756 or similar): you will need a dual directional or two single directional coupler for the band in question(ideally
By Stephen Hanselman · #103770 ·
Re: 693B sweep oscillator restoration
I worked in Electronics for over 50 years. I had to show more than one EE where they screwed up a design. The concept of using a boost or buck transformer to adjust the line voltage has been around
By Michael A. Terrell · #103769 ·
Re: HP4328A-4338A-B HP16143A or B Mating cable socket pins
I don't know anything about the 16143A-B, but the 4328A's front panel connector is a Hirose RM12BPE-5PH(71). These are readily available from DigiKey, for example. -Dave -- Dave McGuire, AK4HZ New
By Dave McGuire · #103768 ·
HP4328A-4338A-B HP16143A or B Mating cable socket pins
Looking to find the manufacturer name for the socket pins and receptacles used the? HP16143A-B mating cables and test leads, also the the part # on the Hitachi 5 conductors cable Have looking at all
By abalogh@... · #103767 ·
Re: HP1700 Series Rear Cord Wrap Feet
You might consider a trip to the hardware store. My Tek 453 had the same problem with his feet. I found some metal drawer pull knobs that looked like they might work. I drilled them out for 10/32 size
By Burt K6OQK · #103766 ·
Re: Testing dummy loads with a VNA
Ahh, you do have one! Excellent. Basically a storage-normalizer provides digital storage, and simple (but specific) math capability for the VNA, providing a great improvement in general usability.
By Dave McGuire · #103765 ·
HP 8644 Phase Noise Problem and Repair
Greetings, I have an 8644B that does not perform correctly in the low phase noise mode (mode 3).? I have measured the phase noise using an 11729C and the 8663A 640 MHz low noise reference output.?
By Ted S · #103764 ·
Re: Testing dummy loads with a VNA
I've been piecing together an 8754a VNA set. I recently picked up the 8748a S param set for around $100. It only works with the 8754a and that's about as obsolete a VNA as you can get but still be
By Paul Amaranth · #103763 ·
Re: 693B sweep oscillator restoration
Does anyone have a line on manuals? Sean
By Sean Turner · #103762 ·
Re: 693B sweep oscillator restoration
My thoughts exactly, Dave McGuire!? David C, I don't know why you thought you had to take on at least 3 members of this group.? ?That is not wise and shows insecurity.Imparting ones knowledge to
By Jim Ford · #103761 ·
Re: HP1700 Series Rear Cord Wrap Feet
Fred Usack can machine high quality rubber feet, with the bolts if needed; I've ordered several sets from him for HP 17xx and Tek scopes. https://www.ebay.ca/usr/fredusack Just tell him thoe model #
By Toby · #103760 ·
Re: Testing dummy loads with a VNA
I do actually have the storage normalizer for this VNA. But I have no idea what it's for or what it does. I don't want to go down the route of a newer instrument. With gear of this vintage I can keep
By Jinxie · #103759 ·
Re: HP1700 Series Rear Cord Wrap Feet
Hi, I had the same problem with a Tek 465 scope. I found some NOS ones that were sealed in their original bags, but the problem was that them disintegrated the same way. Rubber, some plastics and even
By EB4APL · #103758 ·
Re: Testing dummy loads with a VNA
A storage - normalizer would also be a good addition to your 8754A. However, between the cost of the test set and a normalizer, you might be approaching the cost of moving up a notch or two - say to
By nj902 · #103757 ·