[jrgagne99]

I did some more tests this evening, (all in the last 30 minutes before sunset, for what it's worth). It seems that the 33-2230 UVSJ is greatly attenuating my UHF signals. I was using my Solid Signal HDB91X UHF yagi mounted at 30 feet AGL, with a CM-7778 pre-amp at the mast. In Configuration#1, I sent the HDB91X signal directly to the pre-amp (no UVSJ). In Configuration #2, I combined the HDB91X with the StellarLabs 30-2476 VHF yagi using the UVSJ, and then fed that to the pre-amp. Here are the SNRs as reported by my Sony Bravia (typically need SNR>14 to receive channel):

Real Ch____Config#1 (no UVSJ)___Config#2 (with UVSJ + VHF yagi)
13___________0 (no VHF ant)________18
14___________20__________________15
22___________19__________________6
24___________24__________________9
25___________21__________________8
32___________18__________________10
50___________29__________________17


I repeated configuration #1 a second time and confirmed this wasn't a temporal effect. I also did configuration #2 again, but left the VHF input to the UVSJ empty. The results were the same as with the 30-2476 VHF yagi feeding the UVSJ (except of course no Real 13 reception). Leaving the UVSJ out of the picture (HDB91X and pre-amp only) and signal strengths seem to be unchanged as i write this, even though it is now over 1 hour after sunset. One thing I didn't try was to see how Real13 is affected by the UVSJ. It comes in with the UVSJ (SNR=18), but I didn't measure the signal strength if I use the VHF yagi directly, with no UVSJ. Maybe it would be a fair bit higher. Also, FWIW, there is about 100 feet of RG-6 between my mast mounted pre-amp and the power inserter.

It would seem that I should try a different brand of UVSJ. I would rather like to avoid two lines and an A/B switch.