开云体育

Questions:
1) Do you have a spectrum analyzer that can STORE (MAX HOLD on an 8566) 2G - 20G sweep?
2) Do you have a detector that can measure power from about 25dBm to -10 dBm (power meter or xtal detector)?

I am sorry, I forgot to tell you to use CW mode when doing the PRESET,SHIFT,METER test - my fault.

Here is a test that will try to isolate the problem to either unleveled RF output or the ALC system - it assumes you have a spectrum analyzer that can store a full band sweep.

If so, do the following:

1) Set the Spectrum Analyzer (SA) for reference level 30 dB with an attenuation of 40 dB
2) Set the 8341 for 13 GHz (or so) CW mode and press METER - This will essentially disable the ALC system
3) Confirm that the power is within the range of the SA settings (Trace is on scale)
4) Record a sweep from 2G to 20G and note the max and min power levels (Picture would be good)
Note: the best way to record this trace is to set the 8340 sweep rate to approximately 30ms and the SA sweep time to about 200 SEC - put the SA od MAX hold if your SA has that feature. Take a picture of the result.
5) Now on the 8341 do: PRESET,START=2G,STOP=20G,POWER = 5db LOWER than the lowest power recorded in step 4. Leave the SA settings as before and do a sweep from 2-20G (picture of the result would be good)
Next repeat the ALC test I described before:
1) set 8341 PRESET, CW,SHIFT,METER - Rotate the RPG CCW and watch the power output on a spectrum analyzer and watch the 8341 power meter. On the SA, the power should go smoothly from high power (about 20dBm) to low power (-10 to -15dBm), The 8341 power meter should should follow the SA once the power out gets to 5dBm (or so). Note that you will have to turn the RPG CCW and it will take several turns before it starts to take effect.

Based on what you have said so far, I suspect the ALC, but lets do these tests before trying anything else.

Cheers!

Bruce



Quoting RubenRubio <rubenrb2019@...>: