开云体育

Date
Re: VNA cal kit manager and Prologix GPIB?
I use the cal kit manager to create the XML version of the cal kit. In my ' HP8753 Companion ( https://github.com/VK2BEA/HP8753-Companion/tree/main ) ' program for the 8753 I parse the XML and use the
By vk2bea · #139992 ·
Re: VNA cal kit manager and Prologix GPIB?
wrote: My understanding is that it only works with NI or Agilent GPIB cards, but I have not verified that.
By Dr. David Kirkby, Kirkby Microwave Ltd · #139991 ·
VNA cal kit manager and Prologix GPIB?
Hi all, I have just stumbled across the VNA cal kit manager software here on this
By tom_iphi · #139990 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
Why two sets of diodes before the prescaler? I would think that two diodes after the resistor should be enough. The pair after the amplifier have no limiting. Also agree with the comment about
By Ed (scskits) · #139989 ·
Re: help repairing 8133a
Hi, One problem to solve, the next one will be a little more complicated, namely the timing board. For my part, I also ordered an RF relay which I received last week, and it works perfectly.
By Yves Tardif · #139988 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
The MB510 should give more predictable results, having much more uniform frequency response than the UPB1506. If tweaking bias and input frequency response tricks just don't cut it even with the
By Ed Breya · #139987 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
Would it be a better layout if U1 and U2 were rotated to straighten out the traces?? No idea, but it's something that occurs just by looking at it. Harvey
By Harvey White · #139986 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
And just for funsies, here's the latest layout, using the MB510-PF chip and HP designed bias network as per the HP original design. Let em know if there are any glaring errors.
By Jared Cabot · #139985 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
My spectrum analyser is a Siglent SVA1032X, good for 3.2 GHz. I'll have to get a down converter for my scope... It's all SMD (I even mounted the resistors upside down to improve performance) and the
By Jared Cabot · #139984 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
I guess you don't have a wider spectrum analyzer? Raymond
By Raymond Domp Frank · #139983 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
Am 29.10.2023 um 16:15 schrieb Jared Cabot via groups.io: Use a down converter. If you have a -hp- 5257A Transfer Oscillator or similar, you can use that to downsample the HF to below
By Bernd Laengerich · #139982 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
Are the two input chips identical? Is it reasonable to expect the two chips to behave similarly if different? Could it be that adding the resistors somehow adds enough capacitance to mess up the
By Harvey White · #139981 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
Hmm, I'm getting to the point I'm going to give up on this now. I've spent too much time chasing my tail and I'm just not smart enough to figure it out. I can get it to respond from 20 MHz up to 3.2
By Jared Cabot · #139980 ·
Re: help repairing 8133a
Hi Yves, Today I received the RF relay and I managed to replaced the faulty one. Indeed the RF relay was bad as you can see the transmission losses observed using VNA (my VNA can only goes up to
By Xtremexp · #139979 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
Thanks for the links. I use a similar bias scheme but I do a pull up on one input and pull down on the other with a resistor between biasing the inputs around 2.5V point. I now see that I may not be
By Ed (scskits) · #139978 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
I swear, every time I publicly say I can't find something, I immediately go ahead and find it. :D Two app notes on suppressing prescaler self-oscillation by biasing the inputs... AN1014 Suppression
By Jared Cabot · #139977 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
I've added another amplification stage to my design, and replicated the HP bias network too to see if it helps with the random counting with no signal. It's not specifically designed for my chip, but
By Jared Cabot · #139976 ·
Re: Hp 35650a 50 kHz Dynamic Signal Analyzer
Yep, onto the wishlist it goes!? ? ? ? ? ?Jim Ford?Sent from my T-Mobile 4G LTE Device
By Jim Ford · #139975 ·
Re: Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A
I will try to find some time to revisit my board and make a graph of its sensitivity vs the Agilent and we can compare. I am using the MC12079 prescaler and two Mini Circuits amplifiers so it is a bit
By Ed (scskits) · #139974 ·
Re: Hp 35650a 50 kHz Dynamic Signal Analyzer
Dammit. Now I'm going to have to go find one of these. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
By Dave McGuire · #139973 ·