[CQ-Contest] SSB & CW On Same Band

[Jim Brown]

Hi Tom,

We've been doing it for years at the 500W level on our CQP county 
expeditions. I've even done it at home with 1.5kW.

The keys to doing it are 1) equipment with very clean transmitters; 2) 
equipment with extremely bulletproof receivers and very low phase noise; 
3) very good station design, including careful location and orientation 
of antennas, excellent antenna switching and routing, really good coax, 
properly installed connectors, common mode chokes at the feedpoint of 
every antenna, etc.

At CQP, our 20/15/10 antennas are typically 200 ft apart and located so 
that a line between them is perpendicular to their aim point.  Here in 
NorCal, we aim to 70 degrees for domestic contests. For 80 and 40, 
they're also co-linear and separated by 200-300 ft, and we use dipoles.

Each station is a K3 (with new synth board), KPA500, KAT500, P3/SVGA.  
All coax is a very good grade of RG8/213, all connectors are Amphenol, 
carefully soldered. All connections are tightened with a wrench.

At home, the Yagis are separated by about 200 ft, orientation as 
described for CQP. Feedline is mostly 7/8-in hardline to the main tower, 
mostly 1/2-in CATV hard line to the second tower with monobanders for 20 
and 15. Ten Tec Titan 425 tube amps. I can run SO2R on the same band 
with orientation described. I can't if I point one antenna sort of at 
the other. :)  I have, for example, been running to the east or SW on 
10M CW while S&P to pick up several KL7s (NW) or even JA, but I must use 
the antennas for each direction that come close to nulling the other 
antenna. :)

73, Jim K9YC

On Fri,3/17/2017 6:54 PM, Tom Hellem wrote:
> Has anyone successfully run 2 stations on same band, SSB &CW,
> without interference between the two? For example, FD or IARU.