[Mldxcc] Interstation Interference,

[Ron]

Howdy all,

I don't recall any interaction problem accept for, as Jeff mentioned, shack 
audio cross-talk. I only had to deal with Rich's voice, I'm sure he had 
more trouble than I did. %^)

Glad to hear that the MK5's amp is now running ok, What parts needs to be 
replaced on the other radio's amp???

Ron - N6NIA

At 15:04 12/8/2005, Jeff Stai wrote:

>hi Bill - I didn't notice any RF interference between the stations. I 
>haven't analyzed the log to verify this, but it seems to me we never did 
>have one station on 40 and the other on 15 at the same time.
>
>The bigger problem for me was dealing with AF interference between the 
>stations - for example, the other op screaming into his mike while you are 
>trying to pull out a weak one. The full-ear headphones do help, but not as 
>much as I would like. I'm not sure what to suggest, knowing your station 
>setup - other than perhaps a big red that flashes when you are screaming 
>into the mike...;-)
>
>hi Rick - the reasons stubs are preferred in many situations are:
>
>1. stubs can handle full power for much less cost than an equivalent LC 
>based filter
>
>2. the nulls can be quite deep (30dB or more)
>
>3. insertion loss can be quite low (0.1dB, so I am told *)
>
>4. stubs are much more forgiving of mismatches than filters (personal 
>experience) - filters want a 50+j0 across the band
>
>* According to the ARRL review (by N6BV) March 95 of the Dunestar 600, 
>insertion loss varied between 0.5 and 1.1dB.
>
>Filters do have a certain convenience and switchability that is appealing, 
>which is why I am using them now - between the xcvr and amp, of course. I 
>do have plans to migrate to stubs in the coming months.
>
>cheers! - jeff wk6i
>
>
>At 09:13 AM 12/8/2005, Richard (Rick) Karlquist (N6RK) wrote:
> >I never noticed any self-QRM, but I wasn't
> >on 15 meters.
> >
> >FWIW, it is far more effective to make traps
> >with a coil and capacitor than a stub.  A piece
> >of coax is a very low Q resonator, and you
> >can't choose the effective L/C ratio (it's fixed
> >by the 50 ohm impedance.)  You can parallel 2 or
> >3 pieces of coax in the stub to help with this to
> >some extent.
> >
> >Also, to keep 40 meters out of 15 meters, a low
> >pass filter on the 40 station and a high pass filter
> >on the 15 station would make more sense than traps.
> >
> >Rick N6RK
> >
> >> -----Original Message-----
> >> From: mldxcc-bounces at contesting.com
> >> [mailto:mldxcc-bounces at contesting.com]On Behalf Of Bill
> >> Sent: Wednesday, December 07, 2005 9:14 PM
> >> To: Jeff Stai
> >> Cc: Mldxcc at contesting.com
> >> Subject: [Mldxcc] Interstation Interference,
> >>
> >>
> >> To the folks who have operated here in the last couple months,
> >>
> >> Please tell me what you recall about interstation interference.
> >> Just before
> >> CQWW SSB I installed stubs to keep 15M out of 40M and 40M out
> >> of 15M. Trivial tests suggest meaningful improvement.
> >>
> >> I'd like to hear from any/all about how things went wrt interstation
> >> interference no matter what bands you were on. Specifics would be
> >> great but generalities will be appreciated as well.
> >>
> >> Thanks for taking the time to reply,
> >>
> >> Bill K6KM
> >>
> >> >
> >> >
> >>
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> >>
> >>
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>--
>Jeff Stai               jds at twistedoak.com
>Twisted Oak Winery      http://www.twistedoak.com/
>
>
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