Rx Tx antenna seperation

[Nigel waller]

How far apart do the antenna's need to be could they be next to each other and not cause
interference to each other?

Nigel
 

[The Westmorland Flyer]

For a single PAW there is only one transmitter - the P3i  signal via the ARF antenna. There are two receivers though - the P3i signal, again using the ARF antenna and the ADS-B receiver using the smaller antenna connected to the DVB-dongle.

I am nervous of having the antennas too close together although tests seem to have shown that the ADS-B receiver is unaffected. I suspect the reality is that the P3i transmissions are so short that any blocking that does occur has no noticeable effect on ADS-B reception. It is unlikely that the P3i signal is strong enough to damage the DVB dongle, especially if the ADS-B antenna has been cut down to be resonant on 1090MHz.

[Ian Melville]

John, don't forget there is also a WiFi dongle.

[The Westmorland Flyer]

Yeah, I thought of that after I'd posted. So yes, two transmitters and  four receivers... there really is quite a lot of wirelessy stuff going on isn't there! I think, though, that we can practically ignore any EMC issues with the WiFi system as it is way up there at 2.4GHz. Similarly I'd not expect the P3i transmission to interfere with GPS reception.

869.4MHz Tx and Rx: P3i
1090MHz  Rx only: ADS-B
1575MHz  Rx only: GPS
2400MHz  Tx and Rx: WiFi AP

All rather fast wiggles for me: I tend to do most of my wirelessry between 1.8MHz and 30MHz!

[rodent0_2]

 "All rather fast wiggles for me: I tend to do most of my wirelessry between 1.8MHz and 30MHz"

must be a fellow radio ham ?
Nick.

[The Westmorland Flyer]

G3WGV
There's quite a few of us on this forum!

[rodent0_2]

G1JJT

The Rodent aka Nick..

[Paul_Sengupta]

G(W)1YJY...

[sandy]

Another...GM4IBI

[Bill Maxwell]

Another here, for what it's worth VK7MX

[Ian Melville]

Not Ham, but got a City & Guilds Radio C, which I am told is the equivalent to the Uk Amateur Radio exam.

[Richard W]

You are all very bad people    The last thing I need is another hobby, and you have induced me to look at the RCF Foundation course.  It has revived memories of the CCF network in the 'sixties, using a WS12 and an R107.

[The Westmorland Flyer]

Be very afraid . Beyond Foundation lie the Intermediate and Full licenses. And Morse Code. And another very engaging hobby, albeit nowhere near as expensive as flying!

[tfede]

Another one here, IK4YGE 

[the_top_pilot]

In my latest config with great ADS-B reception and very good P3i coverage my antenna are as close to touching as I can get them separated only by the radius of the small mag base (on the subject of mag base I have broken the magnet out and discarded and 'Hook and Loop' fastened the antenna to the box).