Separation of antennae A and B
Posted: Tue Apr 24, 2018 3:39 am
Following on from a previous post (viewtopic.php?f=5&t=3006) I was playing around with my antennae last night and connecting them in various ways.
One thing I noticed was that my discone (on aerial input A) was picking up a NOAA satellite better than my QFH (on aerial input B) which did not really make sense to me. So I swapped them around and fund that the QFH on Aerial input A was now performing better than the discone on aerial input B.
Originally I had an LNA being fed by the bias-t on aerial input B but I found that it was drawing more current than it should when it was working (I had not checked the specs properly).
Using the LNA raises the noise floor but that is all - it is as though it swamps the signal that I can (just) see with the LNA off. I have the gain reduction set to its mid-range on the SDRplay software with the RF AGC on. (If there are other settings that are of interest, please let me know)
I was wondering if I could have damaged the front-end electronics on aerial input B by abusing the bias-t supply?
Susan
One thing I noticed was that my discone (on aerial input A) was picking up a NOAA satellite better than my QFH (on aerial input B) which did not really make sense to me. So I swapped them around and fund that the QFH on Aerial input A was now performing better than the discone on aerial input B.
Originally I had an LNA being fed by the bias-t on aerial input B but I found that it was drawing more current than it should when it was working (I had not checked the specs properly).
Using the LNA raises the noise floor but that is all - it is as though it swamps the signal that I can (just) see with the LNA off. I have the gain reduction set to its mid-range on the SDRplay software with the RF AGC on. (If there are other settings that are of interest, please let me know)
I was wondering if I could have damaged the front-end electronics on aerial input B by abusing the bias-t supply?
Susan