[aprssig] Antenna separation

Patrick winston at winston1.net
Sun Apr 30 09:35:36 EDT 2017

'Far apart' isn't always possible, but remember RF travels in waves, and 
as such for every wavelength you will have nulls where the signal is 
almost completely 0 as seen by another antenna with the same 
orientation.  By locating the antennas in each other's nulls on 2m you 
can more or less completely negate the interference.


On 4/26/2017 8:20 PM, david vanhorn wrote:
> So, I'm about ready to push the button on this.
> I'll be limited by the location spots available, but I have one more 
> question:
> I'm intending to have the FTM-350 running APRS, and the IC-7000 
> running voice on 2m/440
> I know I should mount those antennas as far apart as possible, but 
> given the 50W output of each, what is the minimum separation for the 
> safety of the radios?
> It's almost certain to end up with the 7000 V/U on the front mount 
> point, FTM-350 on the middle, and the 7000 HF antenna on the back.
> I know the APRS will still punch holes in my reception on the 7000 
> VHF, but I'm hoping to minimize that. My main concern is not having 
> the front ends damaged by the RF from the other radio.
> -- 
> K1FZY (WA4TPW) SK  9/29/37-4/13/15
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