HP8753C VNA Sampler Teardown & Reverse Engineering

[JoeyDeng]

all the things works fine

[JoeyDeng]

But my spectrum is dead :pdead, Next plan is to make a spectrum analyzer with the components in this anritsu ms710.

[JoeyDeng]

the noise figure of source is in spec and acceptabel😆

[JoeyDeng]

After spending a longgg time washing this sh!t spectrum analyzer which with a large amount of juicy battery.  I just want to gave up, almost all the logical parts and AFE are dead. The IF generator is dead and the front att and sw also has get damp…   

[EggertEnjoyer123]

Are you using the KHD-23 connectors?

Have you simulated the transition yet for those yet?

[JoeyDeng]

I use sma-kcd47. And I’ve done the simulation in ads with a paltry number of parameters, I bought a lot of magnetic ring, but none of the seller provides the exact parameter for simulation.  and also I’m  really curious abt how HP make their directional coupler have that high directivity. So I did some research on “Joel P. Dunsmore "Dual directional bridge and balun used as reflectometer test set," US Pat. Nº 4 962 359, Sept.10, 1990.” But I haven’t got any inspiration yet