My Diveristy Adventures
Posted: Sat Mar 09, 2019 12:18 pm
Ok, so here it is, two things...
Number 1: I live in an urban environment and deal with a TON of noise. I have a 10 over to 20 over 9 noise floor on 75m. I have been able to locate the noise source to my neighbor, but I don't know them and I haven't approached yet. So anyway, I made up a 200' "diversity" antenna, an 18awg piece of insulated stranded copper wire, soldered to the center conductor of a PL259, using an adaptor, going into rx2. I was able to get the signal of the noise source as loud as 40 over 9. But one thing I have noticed about diversity, is that no matter what, You can get rid of the noise and drop the noise floor, but signals that are on the band, do not "come out of the noise". The signal to noise ratio either stays the same or I can completely phase all noise and signals out. I am using Rx1 & RX2 as my receiver source and im using RX2, that is set on ADC 2, for my reference source. So basically, I can get rid of the annoyance of the interference, but unfortunately, im not able to hear stations with diversity enabled, that I was previously unable to hear with it disabled. Thats what I was hoping for. I was hoping I could utilze Diveristy to help with DX stations or stateside stations that were right at my high noise level. And If I could drop the noise even 2db, and not effect the signal of the incoming station, that would be amazing!
Number 2: Transmitting with diversity enabled... I CANNOT transmit with my diversity antenna connected to RX2, due to excessive RF coming back in the shack and overloading ADC2. Doesn't matter if I have the amplifier or not. Doesnt matter if diveristy is enabled or not. I have to disconnect it from RX2 before I transmit. The diversity antenna is 40' away from the transmitting antenna. Any videos or tutorials Ive ever seen, only discus the receive side of things. I have auto mute RX2 on TX selected as well.
So, am I doing something wrong?
Thanks!
Perry
KC3JVE
Number 1: I live in an urban environment and deal with a TON of noise. I have a 10 over to 20 over 9 noise floor on 75m. I have been able to locate the noise source to my neighbor, but I don't know them and I haven't approached yet. So anyway, I made up a 200' "diversity" antenna, an 18awg piece of insulated stranded copper wire, soldered to the center conductor of a PL259, using an adaptor, going into rx2. I was able to get the signal of the noise source as loud as 40 over 9. But one thing I have noticed about diversity, is that no matter what, You can get rid of the noise and drop the noise floor, but signals that are on the band, do not "come out of the noise". The signal to noise ratio either stays the same or I can completely phase all noise and signals out. I am using Rx1 & RX2 as my receiver source and im using RX2, that is set on ADC 2, for my reference source. So basically, I can get rid of the annoyance of the interference, but unfortunately, im not able to hear stations with diversity enabled, that I was previously unable to hear with it disabled. Thats what I was hoping for. I was hoping I could utilze Diveristy to help with DX stations or stateside stations that were right at my high noise level. And If I could drop the noise even 2db, and not effect the signal of the incoming station, that would be amazing!
Number 2: Transmitting with diversity enabled... I CANNOT transmit with my diversity antenna connected to RX2, due to excessive RF coming back in the shack and overloading ADC2. Doesn't matter if I have the amplifier or not. Doesnt matter if diveristy is enabled or not. I have to disconnect it from RX2 before I transmit. The diversity antenna is 40' away from the transmitting antenna. Any videos or tutorials Ive ever seen, only discus the receive side of things. I have auto mute RX2 on TX selected as well.
So, am I doing something wrong?
Thanks!
Perry
KC3JVE