| Electronics > Repair |
| Aeroflex IFR-2398 / calibration / repair help |
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| andy_silicon:
As previously stated - they won't give me the program for calibration. I have already worked out the passwords ( one of them is in the service manual ) And I'm also quite far into reverse engineering the firmware O0 I've found the undocumented GPIB calibration table read/write commands but haven't tried them. Once the factory menu is entered you could manually write down the 300+ calibration values :=\ Anyway watching the Tour de Yorkshire this weekend - so the IFR will have to wait. |
| andy_silicon:
I've confirmed that the the rf path from input to the 1st mixer has a maximum loss of 4-5db (40Mhz to 2Ghz ) Yet by the time we get to the 10.7Mhz IF we have a minimum of 16db loss. 40-500Mhz is flat as shown on the SA. ( but the power on calibration will probably correct the 16dB loss ) After that we have upto 16db roll off til 2.7Ghz. I note that the Yig is supposed to provide +15dBm but I see about -10dBm. Unfortunately my equipment only goes upto 4Ghz , and the Yig is 3.4-6.4Ghz. Would a low level LO cause a problem ? ( unfortunately the service manual doesn't give levels for the 1st LO ) |
| KJDS:
I'd expect between +7 and +17dBm as the 1st LO drive level. if you can identify the make of the first mixer then it should be easy to check what the drive level should be. Low LO drive level on a mixer causes the conversion loss to increase substantially from a typical 6dB to a lot more than that. |
| andy_silicon:
Minicircuits MCL-1 SKY-60 http://217.34.103.131/pdfs/SKY-60LH.pdf It's a +10dBm mixer Or it could be +7dBm ( I'll have to look more closely at the exact model ) |
| dbloong:
this yig is micro lambda . http://www.microlambdawireless.com/ you see yig services pdf. my ifr-2398 spectrum analyzer . RBW FAIL......... i need rbw cal |
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