On 5/6/2019 9:14 AM, Bert Craig wrote:
I run approx. 200 watts from my mobile. It's been trouble free over the last
four or five years. To the best of my knowledge, no adverse effects on other
vehicles either. I do use LMR-240uf throughout and employ numerous snap-on
ferrites as well as a full toroidal RF choke between the output of the amp and
the antenna.
The right place for serious TX chokes is at the antenna feedpoint, NOT
at the rig.
Also, all units are grounded directly to the vehicle chassis and bonded to each
other.
Proper bonding in a vehicle is different from bonding in a fixed
station. In general, rigs should NOT be bonded to the vehicle chassis,
and contrary to what is written on the site of a so-called mobile
authority, DC power should be a pair run directly from the battery,
ideally a twisted pair. Fundamental reason is that bonding the rig to
the chassis provides a loop return path for noise and coupling RFI
to/from the vehicle's computers. Also, the rig is not the source of RF,
it's the antenna!
73, Jim K9YC
So far, so good.
Vy 73 de Bert
WA2SI
-----Original Message-----
From: Charlie T <[email protected]>
To: [email protected]
Sent: Mon, 06 May 2019 11:24
Subject: [Elecraft] Mobile high power
Has anyone considered the liability of running very high power mobile?
What if you're running a KW, and gave a call on 20M. Suddenly, the guys
brakes in the vehicle next to you locked up causing a multiple vehicle
crash?
I realize this is an extremely hypothetical and unlikely case, but these
smart vehicle computer systems can't be all THAT immune to all sorts of RFI.
I know the cruise control my 2000 Dakota would mysteriously jump 5 MPH if I
keyed up with only 25 watts on 222MHz.
It would return to it's previous setting when I un-keyed. VERY
disconcerting eh?
73, Charlie k3ICH
This begs the question: Why KX3s with KPA500s? That is what I use in my
mobile station and it provides about 250W due to the FCC amplifier gain
requirements. I am fine with it, as that is what I have and higher power may
affect the vehicle. I have seen someone post a modification to remove an
attenuator in the amp and recalibrate the power meter, but I would assume
that Elecraft will not be allowed to do that, as the FCC Cert holder.
73,
Mark
W7MLG
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