I agree with staying isolated from the vehicle electrical system. I have
used a laptop and SDR-IQ with a small loop with good success. In the car I
can also plug the sdr-iq into my hustler mobile mount for more sensitivity
for wide area searching. I just wrap the usb cable between the laptop and
sdr-iq through a ferrite to block some of the computer noise, but otherwise
it runs independent of the vehicle and can be carried by hand just about
anywhere.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Jim Brown
Sent: Sunday, December 25, 2016 21:56
To: rfi@contesting.com
Subject: Re: [RFI] Mobile K3s/P3 RX only?
On Sun,12/25/2016 10:57 AM, Jim Miller wrote:
> I'm doing a rundown test right now on a gel cell I could also use but
> I'd rather have as little equipment to carry around as possible.
>
> I would be stopping and turning off the car at each measurement location.
> Antenna would be my National RF DF loop with the appropriate loop
> installed. I'd use a relatively long coax from the loop to the car
> interior to get away from the metal.
>
> Thoughts?
I would suggest that you try to operate independent of the vehicle's
electrical system to minimize the possibility of coupling noise from it, and
certainly to be able to stop and measure with the car turned off.
Several members of this list have posted spectral response data showing lots
of electronic noise that they have identified as coming from their vehicle.
One of the LiFePO4 batteries sold by Bioenno Power would be a good option.
They have a range of nominal 12V batteries with capacities from 3Ah to
200Ah. Weight is less 4-5 oz per Ah, and they're much more compact than
lead-acid batteries. Cost is about $11 / Ah. A 6Ah battery is close to a
3-in cube and weighs 1.4 pounds, and would run the K3/P3 for about 4 hours.
73, Jim K9YC
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