Yes - the LO drive is the same at both LO DDS ouput SMAs. I have not checked the Detector inputs but I dont expect to see a significant difference there. I...
Hello, I have recently completed my N2PK VNA using Ivan's PCB and it is working great! My question is the following, how can I measure the output and input...
Hi Elia, If you have a look at myVNA’s help file you’ll see an example on how to measure the impedance of a crystal filter. It will also design a matching...
Hi Elia As Roderic says, look at his worked example in the myVNA help files. The easiest way is just to measure it in a 50 ohm system then use the network...
You'll have a tough time measuring the Input/Output Z of an amplifier with the VNA. Most of them have I/O Z that varies greatly with the drive level. (And...
See this document regarding measurement of "Hot output Z": http://groups.yahoo.com/group/VNWA/files/SWetterlin/ The idea is to make a measurement with the amp...
... As well as class of operation (e.g., Class A, C, etc.). For a long time, I believed that the source Z from a modern, solid-state amp was entirely...
Thank you everyone for your responses, I realise now that measuring the input/output impedance of an amplifier is not as simple as connecting it to the VNA... ...
Hi Elia, As others have noted, amplifier impedance measurements get complicated when the amplifier is used for large signal usage where it goes non-linear. ...
Hi all, I`m trying to better understand LLC-calibration. What I found so far is HP/Agilent App. Note 1369-6 There, one find a rudimentary explanation. Has...
Hi Eric, Agilent 1369-6 is probably as good as any, as I recall. I'll check my files later to see if I can find anything else. Briefly here is how I view LLC...
Many many thanks Paul to both answers. I was really puzzled to read that the phase uncertainty of the load could influence the overall measurement accuracy ...
I am still experiencing adc timeouts. I can get the signal generator to work, but turning on either or both adc's cause a timeout. Reading earlier emails it...
HI Gary Weird one that. I assume 00 40 and 80 refers to the ADC mode. So using ADC1 alone works, using ADC1 and ADC2 simultaneously works but using adc2 on its...
Ok. Here is what I have... I checked my BOM spreadsheet, which I used to keep track of everything I purchased for this project and discovered that I have every...
Hi David, both adc's will not work. It times out no mater if I select adc 1, 2 or both on the sig gen. I sure am stumped. Wonder if anyone would be...
Hi Gary Understood. I should have noticed - the chip is indicating ADC results available (28 in byte 2) but the value is all zeros which is wrong. I do not...
I will check the vcc on the Cyprus chip today also. The bar graph on the sig gen shows half on both adc's, and the digital readout indicates 0000 so I am...
Also confirm board revision noting that V5 board and corresponding firmware inverted sense of ADC data lines. This inversion is done on the USB controller...
... Don't believe that exists. If you don't want to wade thru all the docs, then your best bet is to get one of Ivan's recent PCBs and use whatever parts you ...
Some info can be found here http://www.makarov.ca/vna_2503.htm But it was recorded for the dual detector boards development and not for the transition from the...
Do you have a N2PK VNA, and would you consider letting me rent it (by mail) for a week or two? I want to see whether it works for my application, before I buy...
Of course, Paul. The short answer is "San Diego, with plans to visit Boulder and northern Arizona this summer." Hams in San Diego probably know a colleague of...
Roderick Sorry I'm a bit slow. Did you receive the answer you wanted re Ubuntu? I use Kubuntu (ubuntu with windows-like gui: KDE). I run myVNA under vbox...
Hi Tom, Yes I found that it was a catch 22 situation, I needed Windows xp even in Virtual Box. Someone directed me to where I can purchase Windows xp which was...
It might be worth investigating writing a specific driver to run under Ubuntu for the USB interface - it probably needs to replicate the cypress cyUSB...
Hi Dave, I don’t know much about the Linux OS. I wonder if it is possible that a Linux driver could be written for all Linux versions not just for Ubuntu?...
