---------- Forwarded message ---------
From: Rex Weatherford
Date: Wed, Feb 20, 2019 at 7:18 AM
Subject: APRS Newbie
Please forward to the appropriate member with APRS experience.
I have been playing with APRS the last few days and trying to learn the
format. I finally was able to get my PC to PTT on my IC-7100 using a
virtual com port.
I was hoping to get some elmering on APRS and to make sure my messages
are formatted properly. I've been reading some, but I'm sure I will
miss some details and don't want to cause any issues.
I am located in Shelbina, MO and often travel towards Quincy. Today I
traveled in lower and central Shelby County. It seems to be a stretch
to hit the Centralia digipeater. I am hitting it at the high spots but
many of my transmissions are not making the system. It is possible that
my audio signals are not set correctly. I was reading about setting
them tonight so I should check them sometime soon for proper
modulation. In the mean time I may lower my input audio and see if I
see any improvement.
My current setup is on a truck using a 5/8 wave ground plane antenna,
IC-7100, Win10 laptop running direct USB connection to the 7100. I am
running "soundmodem" by UZ7HO to a virtual com port, which interfaces to
PTT the 7100 using the ICOM USB driver on COM3. Today I was using
APRSIS32 for a user interface.
I ran trips along the same or similar path using 20-50 watts. Power
level didn't make a lot of difference. Just seemed to be terrain
related. I'd say I am on the fringe of coverage area. I had issues
decoding the transmissions from the digipeater, but could hear them on
the radio fine. I don't think I am getting two digipeaters at the same
time, but I suppose that could be possible. Pre-amp may have helped a
little, but I'm not sure. In several areas there is a lot of power line
noise on my S-meter, so I'm sure that is not helping the signal. (power
lines on both sides of an E-W road and a power substation)
I'm hoping you can look at my packets and be sure I don't have any
settings bothering the system or causing extra repeats. I tested
tracking today (2-19-19) and sent an email and message to another APRS
user in the local area. The email was a problem because I was not
getting a confirming ACK repeated and didn't know if the packet made the
trip to Centralia.
If acceptable I could try crossband repeating my signals from UHF to a
small repeater on VHF out to the system. This would probably cure my
poor coverage area, but I would need a suggestion and approval on which
UHF frequency to try.
Thanks and 73!