[Elecraft] OT - operating QRP at same park

[Doug Smith]

I used to work Field Day with a friend in the two transmitter class.  At our first Field Day, we had the usual problems as described by the original poster.  Especially so because we were both running 500 watts.

On our second and all subsequent operations we operated with one station on a vertical and the other with a horizontal antenna.  That helped a lot.  

On our third and subsequent mountain top FD expeditions we put a receive-only antenna 800 feet away and fed the sigs back to the operating tent with a big roll of RG-6 quad shield.

Problem solved.

There are a few mechanisms available to aid in “separation”.  Get the antennas physically as far apart as possible.  Try cross polarization.  Operate on bands as far apart as possible.  Band pass filters.  Stubs.  Some antenna tuners are configured as low pass; some are configured as high pass.  Single band resonant antennas are band pass filters (watch out for odd harmonics).

73,
Doug, W7KF
http://www.w7kf.com <http://www.w7kf.com/>



> On Apr 17, 2017, at 9:14 AM, Bert via Elecraft <elecraft at mailman.qth.net> wrote:
> 
> Jack, W6FB, made a good point about resonant antennas. Going with  this 
> idea, separate resonant antennas should be used for each band, and mobile  
> antennas, being high-Q may be particularly desirable. However, minus separate  
> bandpass filters (to augment interference rejection), physical separation of 
> the  antennas by some(?) distance is also desirable. In the case of 
> horizontal  antennas (dipoles, yagis, etc), orientation (right angles or end-to-end) 
> along  with physical separation is key.
> 
> Multiband and non-resonant antennas can't be counted on for signal  
> rejection in most cases.
> 
> The best lessons for minimizing station-to-station interference can  be 
> gleaned from multi-multi stations; their challenges and how they overcome  them 
> are always insightful.
> 
> 73, Bert N4CW