[Rover] Interstation Interference in Multi-Op Rovers

[Robin Midgett]

What length do you require, and how many of that length?
Working with the 3/4" CATV line is easy; a SO-239 barrel connector will fit
easily once you hollow out the dielectric foam. Use a hose clamp to connect
the shield to the barrel.
http://amfone.net/Amforum/index.php?topic=29007.0;wap2, or Google "CATV
line ham radio"

You cover shipping, cable is free.

On Mon, Sep 25, 2017 at 10:58 PM, Sean Waite <waisean at gmail.com> wrote:

> 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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