[aprssig] Barebones "Data Radio"

Scott Miller scott at opentrac.org
Tue Mar 7 11:41:49 CST 2017


Friendcom built a final batch of 400 or so FC-301/Ds a while back. No 
idea how many are left, but AFAIK they're not going to make any more.

The 302s are nice - better heat dissipation, nicer case.  Haven't had 
much opportunity to really put them to use, though.

Scott
N1VG

On 3/6/2017 6:19 PM, Brett Friermood wrote:
> I would not be putting them in as near an extreme environment as Jason 
> did, so I think they would actually be worth trying. However this 
> brings me back to my initial post, as I am unable to find a reputable 
> supply source. It appears the FC-301/D and the FC-302 are still being 
> manufactured. They both appear on Friendcom's website along with other 
> products, and the company is planning on attending IWCE at the end of 
> the month.
>
> I did stumble across the Ritron DTX+ series of telemetry transceivers, 
> which appears to be what I am looking for. However they appear to be 
> somewhat sensitive to releasing much information. Most locations of 
> information on their website advises to contact them directly, even to 
> find a dealer. On the plus side, they appear to offer a 1.25m capable 
> radio which would be very helpful for a future project I have in mind.
>
> Brett KQ9N
>
> On Mon, Mar 6, 2017 at 6:46 PM, Fred Hillhouse 
> <fmhillhouse at comcast.net <mailto:fmhillhouse at comcast.net>> wrote:
>
>     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
>     <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 <mailto: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.
>
>     -Jason
>     kg4wsv
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