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[aprssig] HF project

Scott Miller scott at opentrac.org
Thu Oct 30 05:39:20 UTC 2008


This is just a regional project, and there are only a few channels 
available, and only a couple of those that are likely to work well for NVIS.

300 baud AFSK would be nice if it'll work, but running multiple PSK31 
signals should be feasible.  I know I can do it with the OpenTracker 
without any additional code (it'll let you select the audio carrier in 
31.25 hz steps) if the transmitters have sufficient frequency stability.

I've had some feedback from a couple of people on this, but if anyone 
else happens to have a 60-meter transmitter design and/or experience in 
mobile NVIS networks, let me know.

Scott
N1VG

Jesse (KC5LOS) wrote:
> There are a few gateways down on HF in the 30m band. I use a TT3 with a 
> FT-100d when not on voice and have perty good luck with it. I think any 
> HF rig would work that has 30m in fact there is a MFJ rig on 20m or 
> could build something suitable for 30m where I see most of the gateways.
> 
> Scott Miller wrote:
>> Hi all,
>> 
>> I've been contacted by someone wanting to track a number of vehicles on 
>> HF for a humanitarian mission.  Sounds like their channel allocations 
>> are on 60 meters or thereabouts.  I can cover the GPS and tracker parts, 
>> but I need to know who's got suitable transmitters available, or would 
>> be interested in designing something.
>> 
>> I don't have a lot of details yet on the range requirements (probably in 
>> the hundreds of km, I'm assuming this would use NVIS propagation) but if 
>> I can get an HF expert to join in a teleconference (probably tomorrow) 
>> we can find out exactly what's needed and how feasible this thing is 
>> going to be.
>> 
>> Thanks,
>> 
>> Scott
>> N1VG
> 
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