[Rover] Interstation Interference in Multi-Op Rovers

[Jonesy W3DHJ]

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 |     __
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