[aprssig] Barebones "Data Radio"

Fred Hillhouse fmhillhouse at comcast.net
Mon Mar 6 19:46:34 EST 2017

As another data point, there was a gentleman using one that had running over two winters using a solar panel and battery only.

Best regards,
Fred N7FMH

-----Original Message-----
From: aprssig [mailto:aprssig-bounces at tapr.org] On Behalf Of Jason KG4WSV
Sent: Monday, March 06, 2017 11:22 AM
To: Brett Friermood
Cc: TAPR APRS Mailing List
Subject: Re: [aprssig] Barebones "Data Radio"

On Sun, Mar 5, 2017 at 1:51 PM, Brett Friermood <brett.friermood at gmail.com> wrote:
> Thanks for the info Jason. I remember the information I found was 
> somewhat limited, so it's nice to hear of some real-world experience. 
> I'm guessing those issues may have contributed to them being pulled.

I think they got discontinued by the manufacturer, but I may be misremembering that.

I wouldn't hesitate to use one if the price was right and it fit my application.

High altitude balloon flights can be rather unforgiving environments.
You basically pull a vacuum on it, subject it to -40C or lower temperatures, then return it to ground temperature and humidity.  If you happen to pass through humid air on the way back down, you're sucking warm moist air across frozen hardware and practically forcing maximum condensation.  We've had cases where we poured water out of payload enclosures due to this effect. If this happens to a PCB with sub-optimal cleaning and any sort of activated or corrosive flux, the results are unfortunate.

> Are you running 9600bps with the HT's?

Nope, we stuck with 1200 baud for tracking on those projects.

> There is also some experimenting I'd like to do with the higher data rates of the Direwolf modem.

I thought there was a UHF model, once upon a time? that could be useful for even higher data rates.

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