LNBH23 and LNBH26

Hi,

I am using LNBH23 and LNBH26 for our LNB control. And I have the following question:

1) When I power LNB with 18VDC, I can enable/disable 22KHz properly.

2) When I power off LNB, I can't enable 22KHz.

Anyone can tell me how to enable 22KHz without LNB power applied?

Thanks,

Christie

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