EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: tchiwam on April 29, 2021, 11:38:45 pm
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Anyone her ever played with the 85645A ?
FYI:
Band 1 Up to 6.46GHz
Band 2 5.7 to 13GHz
Band 3 12.36 to 19.7GHz
band 4 19.031 to 26.5GHz
In CW it is able to make a nice spike between 12.36 and 19.7GHz (band 3)
But when I use tracking (offset or not) it is not working.
I did the service procedure a couple of times and Band 1 2 and 4 are getting flatter every time I do the procedure again.
I did adjust the frequency and I am getting something within a few Hz in band 1 2 and 4 in tracking mode
I guess the module A6 SYTM (Multiplier by 1 2 3 4) is working and I guess the filter is following too as they work in CW.
Anyone having the diagram of the A3 board ? I want to know the difference between the CW and tracking.
If I use 0 span and a frequency in that range I have a spike really far off wide band thing ....
Lucky enough I have 2 Spectrum analyzer to play with today... Even if one is a little hurt.
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Some pictures
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The 85645A itself...