I may not be reading that statement correctly, however, speaking as an installer, if i have around 40dBµV of good quality signal coming from an antenna (not uncommon with some of my installs), after adding an amplifier, I would not be leaving the property with only 40dBµV of signal available from the outlet plate.
I'm an installer to, been doing it for years.
You're right with 40dBuV. I'm yet to find a long term successful installation with only 40dB at the antenna, even if I was to instal an amp & boost it to 57dBuV at the outlet, I wouldn't be guaranteeing long term reliable solid reception. 40dBuV is way too close to the cliff edge.
Absolute minimum I look for out of the antenna is 48dBuV, having at least 9dBuV margin above the general cliff edge. With getting a quality signal with a power of around 54-57dBuV at the outlet. I wouldn't boost the signal though just to get that level at the outlet.
You should well know the standard recommended minimum signal level is 45dBuV at the outlet, but having 40dBuV at the antenna & amplifying it to 45dBuV won't cut it. You should also know an amplifier won't improve a digital signal & 40dBuV is too low for long term robust signal quality, just because you have a good MER at a low signal strength, doesn't mean it'll stay good, if the TX goes to low power, weather conditions change & general system degradation, causing the signal strength to drop very close or over the cliff edge. You should also know that not only does an amp, amplify the good, it also amplifies the bad & can make a borderline signal, terminal. An amp should always be turned to minimum & adjusted upwards till you get what you need. Minimal amplification for max. gain. That's even part of the recommended digital installation standards & has been since day one.
We're not there, & don't have accurate measurements, so can't say, but I stand by my recommendation to wind it back to minimum & see what you can get away with/need, obviously if it's too low, turn it up.
The most commonly available amp is a Kingray, MHU24F or MHU24FS, especially if he's getting it from an Electrical Wholesaler, where he got the antenna. I honestly don't think he's going to want that much (24dBuV) or more amplification.
Edited by GlennP, 19 May 2013 - 09:33 AM.