I echo a lot of Rick's sentiments in traffic handling.
There are two types of traffic that we as amateurs would typically handle.
One would be the local VHF/UHF tactical messaging as back-up or replacement
for local systems and local responders. Secondly we would also handle
state/province
Is the volunteer out of VHF range?
If the base station has a 100 watt VHF radio like the 746pro - you
might be able to still reach the volunteer, but he may not have
enough power to get back to you.
Or he may be out of VHF range.
HF is the way to go - but both ends of the conversation need
And further, this thought should be considered as VHF FM, or VHF SSB? In a
base/mobile or mobile/mobile environment, SSB on VHF works over much greater
distances.
With voice communications, VHF SSB benefits from having flutter resulting in
the desired signal amplitude going up and down, while
Howard,
We already achieved successful, error-free, VHF communication (with no
repeated blocks) using NBEMS software over a 70 mile path in flat country
between two 50 watt FM transceivers, one with a 7.5 dBi antenna at 10 feet
off the ground and the other with a 7.5 dBi antenna 25 feet off
FWIW, in the response to Gustav
It was known that Region 4 Resources would be deploying into the area in
support of the Southern Baptist Disaster Relief Organization.
Days ahead, info was exchanged on formal net operations in that area to
allow members from Region 4 to check propagation
Conditions just now are at night hostile to even NVIS. We sometimes eke
out ground wave between MARS members here with vertical antennas below --
well below -- 3.5 MHz. Some nights I'd like something below 1.8!
Nevertheless, my mobile setup, when I have it installed, covers 160-440.
MARS
The last time I got into something like this I was called
(all be it direct reply) a fool.
What works for you in the large city may not work for me
in the rural area with hills all around.
In the floods this spring I at times had the only HF mobile
rig in the county.
I spent the afternoon helping a newly licensed General Class ham get on
digital modes. He has a Yaesu FT-450 and Tigertronics SignaLink USB. We
downloaded the fldigi multimode digital program and were able to get the
received audio to show a good display on the waterfall and prints OK.
The
We get quite good results in the 45 to 50 mile range using VHF SSB (2M)
and 5 watts with Olivia from fixed location to fixed location and low
gain omni vertical antennas. From a mobile to a fixed location,
I would estimate as good a signal on SSB as can be expected from the
same mobile to a
This is something that would likely be more at home at the HFDEC
yahoogroup that discusses disaster and emergency communications but lets
look at some of the practical aspects.
Distance was not specified, but it would be rare to send someone out at
night, under dangerous conditions, in
10 matches
Mail list logo
