[Rover] Interstation Interference in Multi-Op Rovers

[Sean Waite]

Hi Robin,

That would be great! It sounds like the 3/4 inch stuff works well for
stubs. I don't really have a concept of how big the stuff is, the heaviest
cable I've used so far is LMR-400. I'd appreciate it if we could get a
little extra so that I can practice making connectors for it, it doesn't
appear to be too difficult but sometimes "ham" applies to my fists as well
as my hobby.

Would you want anything for the cable or for shipping?

Thanks and 73,
Sean

On Fri, Sep 22, 2017 at 2:47 PM Robin Midgett <K4IDC at comcast.net> wrote:

> I have scads of CATV hard line. I'm happy to cut a section & send it to
> you. 1/2", 3/4" & 1" diameters.
>
> On Fri, Sep 22, 2017 at 1:38 PM, Sean Waite <waisean at gmail.com> wrote:
>
> > Hi Jonesy,
> >
> > I don't know why my brain stuck on blocking the 6m signal at the 2m
> radio.
> > It makes much more sense to do block the ~150MHz harmonic at the 6m
> radio.
> > Any idea how much difference a lower Q piece of coax - either thinner
> > heliax or something like LMR400 - would change the results? I gather it
> > makes them a little more broadband, but I don't know for sure. CATV cable
> > is great but can be a little hard to get a hold of.
> >
> > We were getting some minor interference on  432 as well. I might have to
> > look into a stub there as well.
> >
> > Thanks,
> > Sean WA1TE
> >
> > On Thu, Sep 21, 2017 at 9:21 PM Jonesy W3DHJ <mailserver at jonz.net>
> wrote:
> >
> > > On Thu, 21 Sep 2017, Sean Waite wrote:
> > >
> > > >Thanks, I suspected it might be something like that. We get some
> lighter
> > > >interference on 70cn as well, which is a few more harmonics up.
> > > >
> > > >My worry with the coax notch filters is bandwidth - 150MHz is pretty
> > close
> > > >to 2m. I suppose using higher quality coax/heliax and tuning to 51MHz
> > > would
> > > >help with that.
> > > >
> > > >The rigidity of heliax might make it rough in the rover, a 5' long
> chunk
> > > is
> > > >going to be interesting g to manage and will likely go somewhere
> outside
> > > >the car on the ground.
> > >
> > > Use 3/4" cable TV "hardline" -- use it as a 144.2 mcs suck-out trap on
> > > the 6M rig -- an open 1/4 wave at ~~15" or a shorted 1/2 wave at ~~32".
> > >
> > >                 https://w3dhj.net/catvhardline.html
> > >
> > > If you try to trap the 6M rig (50.130 mcs) at the 2M rig, you run into
> > > the problem of the 6M trap working just as nicely at 150.39 mcs --
> which
> > > may be too close, Q-wise, for the 2M rig.
> > >
> > > Another issue - besides just "interference" - is the possibility of
> > > blowing out the front end of the 2M receiver with simply the
> > > overpowering by the 6M rig.  I blew out a 2M GasFET preamp because
> > > my 6M halo is mounted between my stacked pair of 2M halos.
> > > Sigh...  I just do without that GasFET preamp now.
> > > I can certainly hear anyone that can hear me!  HI!HI!
> > >
> > > Jonesy
> > > --
> > >   Marvin L Jones     | W3DHJ      | W3DHJ  | https://W3DHJ.net/
> > >    Pueblo, Colorado  |  @         | Jonesy |     __
> > >     38.238N 104.547W |   jonz.net | DM78rf | 73  SK
> > >
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