Probably I should say I have the following equipment (test probes are where I am short) and limitations
My lab is not accessible at the moment so I'm not near the equipment, I am pulling things out as I need them
*Oscilloscope Rigol 100Mhz
SA *Rigol 815TG ((1.5 and most accessible) and Agilent E7495A (2.7Ghz)
*Tekbox Probes (near/far field)
2.5 Ghz Active Probe (untested, got off ebay)
*U2001H (USB 6GHZ)
HP E4418B w/ E4412
*Nano VNA
Those I starred are easy to access and move to the E4407/TG for testing
Note: I did Terminate A2A2J2 with 50ohm and checked attenuator settings and had same "Source Unlevel" message, if it helps but seeing as it's measured before the A2A3 that may be expected?
it sounds like plan is
1. I need to re-assemble the TG and verify if "Source Unlevel" is at all frequency's (initial test was at 3Mhz-3Ghz) or some as well as the attenuator values
2. check 600Mhz in to TG at A2A2J5 (note SMB not SMA)
3. Check RF out at A2A1J1 (zero span and set based on finding in #1)
4. Make @analogRF RF Probe.
5. figure out how to measure Yellow section, will likely have to make or find some extender cables to be able to access the board without the shielding on. shouldnt' be hard. just need to do it
there's more I'm sure but a start
@analogRF
A2A1P1 to A2A2J1 Cable sends back ALC_MON to the A2A1 Driver board
I have both the service guide and CLIP but CLIP only shows the A2A1 board,
Attached is where I mention the ALC_MON from the A2A2 board is feed back to the A2A1 board and into OP AMP to create the Unlevel Signal