anubis
New member
I want to mount a nasa dual f aerial on my pushpit. This already has a gps receiver on it. Is there a rule of thumb on distance away from each other?
Thanks
Thanks
Nasa stub aerial
- Thread starter anubis
- Start date
philip_stevens
Active member
On my last boat, I had 5 passive and active mix aerials on one aerial mast at the stern of the boat (and it is still there). All worked well with no apparent degradation of reception signal.
The mix was GPS, dGPS, Navtex, Decca (redundant but with a car stubby inside for the domestic radio) and a TV aerial. Thinking about it, all, except the stubby, were active aerials.
The mix was GPS, dGPS, Navtex, Decca (redundant but with a car stubby inside for the domestic radio) and a TV aerial. Thinking about it, all, except the stubby, were active aerials.
alan
Active member
As they are both receive antennas there should be no problem. The only problem I could envisage is if one is physically blocking "line of site" of another antenna.
I have NASA Navtex, GPS (for plotter) and an HF antenna all sitting on the pulpit withing 30 cm of each other with no problems.
The fact that they are active should not influence the situation - the Navtex and GPS operate at very different frequencies, so even if there was down conversion going on "inside the antenna" it is very unlike lt that LOs or IFs would be in the same band.
Alan.
Nettuno, Italy.
I have NASA Navtex, GPS (for plotter) and an HF antenna all sitting on the pulpit withing 30 cm of each other with no problems.
The fact that they are active should not influence the situation - the Navtex and GPS operate at very different frequencies, so even if there was down conversion going on "inside the antenna" it is very unlike lt that LOs or IFs would be in the same band.
Alan.
Nettuno, Italy.
tome
New member
The more critical of the antennas is gps which looks skywards for its signals. provided you don't significantly block a line of sight more than 10 degrees above the horizontal with the dual f you'll not have any problems.
Birdseye
Well-known member
GPS signals are very weak and can be swamped by even low power sources like phones. Even if the frequency is very different. But the NASA isnt a transmitting aerial is it ? So it shouldnt make much difference.
Run a trial and see.
P.S. My NASA weatherman aerial worked well but the plastic moulding that fastened to the taffrail was pretty weak. Didnt stand much brushing against before failure.
Run a trial and see.
P.S. My NASA weatherman aerial worked well but the plastic moulding that fastened to the taffrail was pretty weak. Didnt stand much brushing against before failure.