[aprssig] Mobile Power Output

Jess Haas k5lli at jesshaas.com
Mon Feb 5 11:37:34 EST 2018

One of the nice things about using a dual receive aprs radio like the
Kenwood D710 is that you can set it to not transmit aprs while the squelch
is open on the other side of the radio. The basically eliminates desense
problems. It also takes care of all the aprs magic for you and when paired
with a bluetooth adapter and tablet makes a super slick setup.

As far as power goes i find that around los angeles where I live 5 watts is
plenty because there are plenty of digipeaters and igates. On open road,
out in the desert and in the mountains it is nice to be able to turn the
power up though.


On Feb 5, 2018 7:46 AM, "Fred Hillhouse" <fmhillhouse at comcast.net> wrote:

When running in my car, I use 25-40W which is more than adequate depending
on the radio (one is fixed at 40W). I have also used an HT at 5W. 25W gets
more packets through but it might be considered an alligator by some. It
seems to take about double the power to get a signal through when compared
to voice.

As far as using while using another 2M radio, yeah when it is transmitting,
your voice machine will be interrupted. I didn’t really find it annoying. A
packet is very short in duration.

The key to using an HT is your external antenna. Use a good one with good
placement! I used a pair of Larsen 2/70s on fixed mounts on each side of my
trunk lid. They were mounted it the gutter rather than on the trunk lid.
Everything worked peachy!

Best regards,

Fred N7FMH

*From:* aprssig [mailto:aprssig-bounces at tapr.org] *On Behalf Of *Michael
*Sent:* Sunday, February 04, 2018 11:05 PM

*To:* TAPR APRS Mailing List
*Subject:* [aprssig] Mobile Power Output

I was mentioning to a local ham I was interested in putting APRS in my
truck. (I'm still digesting all the great comments from my previous query.)
He said I will need a minimum of 50 watts and the frequent transmissions
will pretty much eliminate the possibility of other 2 meter operations
while I have the APRS running. This news is certainly disconcerting. My
original intention was to use a Raspberry Pi with a TNC-Pi connected to a
Kenwood HT with an external antenna. Having to add another full sized
mobile radio and running that much power with all the other radios in my
truck might be an issue.

So, is the need for 50 watts realistic? I do live in a rural area, but
other 2 meter use seems to get by quite well with handheld radios.


Michael WA7SKG


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