[CQ-Contest] 2 tribanders on 1 mast for SO2R?

[Barry]

Dan,
I run SO2R as follows:
One Rohn45 tower. 
TH7 @ 25 ft
TH7 @ 40 ft
TH7 @ 76 ft

The top two are phased. The bottom one for second radio. I have 
both bandpass filter and stubs. At 100W, one radio doesn't know 
the other is xmtg unless I'm within about 15 KHz of a second 
harmonic (eg., 7005 and 14010). At a KW, that second harmonic 
bandwidth increases.

One caveat: When I did my EZNEC modelling prior to installation to 
check on pattern degradation between antennas, I found lots of 
interaction between C31XRs near each ohter, and other antennas. 
The TH7s were relatively immune to interactions, and real-life 
experience has proven this to be true.

Barry W2UP


On 6 Aug 01, Dan Levin wrote:

> 
> I'm thinking about a temporary setup for NAQP SSB 
> that would have a C-31XR tribander at ~80' and a C-3E 
> tribander at ~40' on the same tower.  I would want to 
> use the two antennas, each fed with 1 feedline, for 
> separate radios for SO2R.  I would use ICE bandpass 
> filters, but no stubs.  Does anyone have a sense of 
> how much interference I am likely to have?  This is 
> 100 watts remember - so not as bad as 'full' power :-)
> 
> Thanks!
> 
> 
>                   ***dan, K6IF
> 
> 
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--
Barry Kutner, W2UP              Internet: w2up at mindspring.com
Newtown, PA                     Frankford Radio Club
         


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