Quote:
Originally Posted by mulliganman
I sincerely hope the C2V doesn't need a preamp because unless I am mistaken or misunderstanding, I only had DC pass built into the AC7 for the 91XG (Fox antenna). From an email from the folks at Tinlee: "Your AC7-ch.49 will have DC power pass if you need to have a preamp installed for your ch.49 antenna". That's why I have been interpreting it that way. If I am right, a preamp for the C2V or any other second antenna would require a new AC7 combiner.
Regarding the initial tests with the preamp, you are saying I should disregard signal meter indications and just look for picture problems. Is that correct? And, if a problem does come up to try to use the attenuators to check to see whether it is preamp overload or tuner overload? Can I just check to see if it is tuner overload by inserting it on the back of the coaxial input on the test tuner and connect the coaxial downlead into that input? Am I correct to assume, that if it is tuner overload that I can continue to utilize the attenuators on the inputs and output of the AC7 combiner as planned? If preamp overload is present by process of elimination from testing the tuner, rather than removing the preamp the attenuators should somehow be attached at the antenna. Is that correct? If correct, how/where are the attenuators placed? Or if it is the preamplifier causing the overload, is it taken out of the system?
|
I doubt a preamp is needed on the C2V. But, if one were needed, you don't need a new AC7. That the AC7 has the DC passing feature does not mean it must be used. You have the option to feed one or both inputs of the AC7 from the RF output of the preamp power inverters. Don't worry about it now... It's just an option if you need it.
Don't disregard the signal meter indications. Use both the observed picture and sound, together with the signal meter indications. Generally, stable signal meter indications are what you would like to see. The absolute level does not need to be at maximum in order to produce reliable viewing... If the signal meter indication increases with the addition of a preamp or other accessory, fine... but an unstable reading that's high most of the time may be accompanied by signal drop outs or picture / sound impairments.