Is there a straightforward way to recover at least some data if a
readout results in a CRC error? I have an EasyMega here, that likely
experienced a loss of power around apogee (other devices on the same
battery were affected too) and I'd like to find out as much as possible
about this flight.
For DF’ing a TeleMini once it’s landed, is there a clear favorite Arrow Yagi? 440-3 or 440-5?
I’ll probably be using a Yaesu HT and I have an offset attenuator I can add to the antenna if I need it.
Greetings,I have a TeleMega SN: 1240 that is part of the ARLISS fleet with an unknown history. I'm unable to communicate with it using either USB or the TeleBT. When powered up it gives me an unusual beep code:dah dit dit dit ditI didn't see it listed in the manual. I have a short video (11MB) of the beeps and LED which I can send but suspect it wouldn't fit thru the listserv.
My GSE setup (Win7, AltosDroid, and TeleBT) works fine with a TeleGPS. Any ideas on how to proceed? All replies are greatly appreciated.
Cheers,GaryNAR/TRA L3 - WA7GL
I'm pulling an old rocket out of mothballs to fly at NAR NSL, so I started
by updating firmware. I updated my old TeleMetrum v1.1 to AltOS 1.87 and
(ignoring the manual stating it wasn't necessary) figured I might as well
upgrade my TeleDongle v0.2 while I had the casing off, so I flipped the
umbilical and reset everything.
The first flash attempt failed. The second flash completed OK, and the
light on the Dongle blinked, so I unplugged it. But after plugging it back
in, the Dongle isn't recognized over USB, and I can't get it to re-flash.
The error I get is:
Cannot determine target device type
> Image is fffe:000c
> TeleDongle-v0.2 Flash anyways?
If I say "OK," nothing happens in the UI, and the port gets stuck open
until I restart things.
This seems bad. Is there any way to recover from this state? If not, that's
OK. This Dongle is 8+ years old, and I've been eyeing a TeleBT anyhow....
Hi, I'm of the opin that device maximum operating ratings should be clearly spelled out in the manuals.
For the TeleMetrium V2, the output MOSFET is a SI7232DN, which according to the data sheet has a max of 25A continuous and 25V. There was a recent request on the forum for this.
I recently did a bad thing.
I hooked a LiPo 2s Batttery to my TeleMetrium, and smoke poured off the bottom. Then I revisit the manual, which talks about 1S LiPo but does not seem to mention a max supply voltage for the TeleMetruium. I poked at the schematic, and there is a TC2185−3.3 voltage management chip. Now that I look at the data sheet, it has a max input voltage of 6 volts. Hopefully, it's just the voltage management chip and not everything down stream. I assumed incorrectly that it could handle a higher input voltage.
So please, please spell stuff like this out very clearly in the manuals.
Hello, we have a question. Our telemetrum and teledongle do not have red
pins and red cable in our device. If you show us their connection diagram,
we can link them here. this is a very important and urgent matter. we
need to train the competition.
just tell us which cable should be connected. Telemetrumu teledongleye
trying to connect.
Bdale answer a similar question when I asked about the TeleMega last year. Here's the discussion:
> I've read thru all the documentation, nice job on the manualBTW, but I'm wondering what> the current rating is on the FET outputswitch. An unrestricted
> Lithium battery can pack quite a punch.Should I be adding a current
> limiting resistor to protect the FET?
The FETs we use can pass 19A continuously and40A pulsed. At our default
firing time of 50ms, we're somewhere in themiddle of that range.
If you have a 4.0V battery and a 1Ω igniter, themaximum current you'll
deliver is only 4A, and that ignores all of theother resistance in the
path (connectors, switches, screw terminals,wires, the FET itself
(0.02Ω)). You'd have to find a way to get theresistance below 0.21Ω
before you'd even reach the continuous currentcapacity of the FET.
Even with a 12V pyro battery, you'd need aresistance below 0.63Ω.
To add to what Keith said on the subjectalready...
Even if you put a dead short on the igniterterminals of one of our
boards (not recommended, but it happens),there's always some series
resistance in the wiring itself, circuit boards,screw terminals, the
FET channel "on" resistance, etc. Andour pyro circuit, which is
designed to throttle the energy delivered toactive devices just enough
to keep the processor from crashing has theinteresting side-effect of
acting faster when there's a dead short on theigniter terminals,
limiting the total energy delivered and thushelping to protect the FET
which never really has time to warm up.
> Should I be adding a current limitingresistor to protect the FET?
No. I can't remember ever seeing a board comeback with a FET blown in
normal use. It's just not an issue.
By the way, bench testing I did myself with agood HP scope and some
commercial e-matches a few years ago showed thatthey usually fired
within about 13 microseconds. That's why wethink 50 milliseconds is
more than enough on-time... but we made itconfigurable for those who
have weird igniters, or are using our boards toswitch power to some
other downstream device.
From: GÖKBÖRÜ ROKET <gokboruroket(a)gmail.com>
To: altusmetrum <altusmetrum(a)lists.gag.com>
Sent: Thu, May 2, 2019 1:12 pm
Subject: [altusmetrum] Gökbörü Rocket Team
What is the maximum output ampere rating of the telemetrum v2 card?_______________________________________________
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