Re: Shifting modem
The 12.6 dBmv will need taking down. The splitter will knock off about 4 dB but if you can get a 6 dB forward path attenuator as well, that would put the modem at less risk. Sometimes the SH can hack 10 or 12 dBmb; mine won't work properly if downstream power exceeds 7 dBmv.
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Seph.
My advice is at your risk.
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