Thanks for info, 1st class service
To solve situation I developed Method #3, settled 99.99% of the problem:
Method #2 does not work "out of the box" at VHF because there is substantial jitter which makes finetuning impossible. Solution: Use Methods #1&2 together. Clocks must be synced.
Second problem is with burst mode. There will be ~1us "rearming" delay after burst which makes VHF impossible to implement on 1 cycle basis. 99.99% solution for 100MHz: Use 1000000 cycles burst length, if your DUT can live with 1us signal gap between bursts. Mine can.
Screenshot of tested 100MHz, 4 phase sine signal attached.
Detailed procedure:A=SIGLENT SDG2122X
B=SIGLENT SDG2122X
C=RIGOL DS1104Z
Connected with 50Ohm cables:
A-10MHz + 0.5m + B-10MHz
A-Aux + 0.5m + B-Aux
A-CH1 + 1m + PassThruTerm + C-CH3
A-CH2 + 1m + PassThruTerm + C-CH4
B-CH1 + 0.5m + PassThruTerm + C-CH1
B-CH2 + 0.5m + PassThruTerm + C-CH2
Unit A configuration:[Utility]
(OutputSetup) => (Load) => (50Ohm) => (Return)
(CHCopyCoupling) => Track=On; PhaseDev=-90' => (Return)
(Page1/2) => (Clock) => Source=Internal => (Return)
(Mode) => (PhaseLocked)
[Parameter]
Frequency=100MHz
Amplitude=10dBm
[Burst]
StartPhase=0'
Cycles=1000000
BurstPeriod=10.000990ms
Source=Internal
(Page1/2) => TrigDelay=543ns; TrigOut=Up
Unit B configuration:[Utility]
(OutputSetup) => (Load) => (50Ohm) => (Return)
(CHCopyCoupling) => Track=On; PhaseDev=-90' => (Return)
(Page1/2) => (Clock) => Source=External => (Return)
(Mode) => (PhaseLocked)
[Parameter]
Frequency=100MHz
Amplitude=10dBm
[Burst]
StartPhase=225'
Cycles=1000000
Source=External
(Page1/2) => TrigDelay=617ns; Edge=Up