Active antenna bias network
Active antenna bias network
(OP)
I have a GPS module that calls for a bias network if an active antenna is going to be used. My question is this: If the cable length from the module to the antenna is about ten inches, is this bias network necessary? If so can anyone point me in the right direction? I have no experience in this area so any help would be appreciated.
Thank you!
Thank you!





RE: Active antenna bias network
Amplification is necessary when the coax to the antenna is long as coax has loss based on it's length, and the loss is greater for higher frequency signals. However, in your case you should not require an active antenna and bias network, provide the directions for your module indicate that this is optional. I say this because there could be some cheap modules that depend upon a LNA in the antenna because they eliminated it from the module alltogether to save cost.
RE: Active antenna bias network
Thanks!
RE: Active antenna bias network
The only need to add something like this (active antenna) is when you use a long lossy rf cable from your antenna to your GPS receiver. Some companies who put them on their trucks may use 20 feet of cable and maybe they'd use it. Our company used one to bring GPS indoors for antenna testing conditions and we had 100 feet of cable.
Kevin
Kevin