Re: [tracker2] DR 135 Power?
- Hi - sorry for the long silence; it's been kinda busy 'round here, what with Spring Break.Anyway, yeah, the T2-135 is spitting out a voltage report (it appears to be 1.2-1.4 V). I'm having trouble right now keeping the GPS18 'online'; I'll bring the radio into my bench from the truck Thursday or Friday nite (meetings tonite and tomorrow nite) and see what gives there.Any word on more T2-135 protos?Thanks!ClayN7QNM==========On Mar 26, 2007, at 9:18 AM, Scott Miller wrote:Wow, that's scary. I hope the GPS receivers are more tolerant of -5 V than they are of +12.I made a firmware fix LATE last night for Baker to Vegas - turns out that the insidious timeslotting bug that's kept me from releasing a new OpenTracker build for some time now had made its way into the T2 codebase after all. The good news is that I've got it fixed for both, now. And came up with an idea for sub-second timeslot support while I was working on it. Ought to at least work with the GPS 18, not sure about the Sony chipset. Even mediocre radios ought to be able to squeeze a position report into 1/2 second. If it works out, I figure I'll give it 1/4 second resolution.THEN we've got to figure out how to implement self-organizing timeslotting, like AIS. Only AIS doesn't have to deal with a massive hidden transmitter problem, and digipeaters with overlapping coverage areas... still, even a simple slotted-ALOHA implementation would double the channel utilization. A half-decent self-organizing scheme ought to be able to double it beyond that.Wait... is it a T2-135 that's reporting voltage? They're not supposed to do that. There's no 12-volt supply to measure, and no temperature sensor since I figured people wouldn't really care about the internal temperature in their radio.Scott
From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Clay Jackson
Sent: Sunday, March 25, 2007 7:53 PM
Subject: Re: [tracker2] DR 135 Power?
The other radio is much older; close to 4 years, I think. Here's the REALLY interesting part - when I did a FULL RESET, it popped back to +5, right where it should be.I looked at the schematic, and there's a PROGRAMMABLE voltage regulator on that line, that will deliver +5 to -5 (and +12 to -12 on a different set of pins). So, I guess something flipped a bit somewhere. I'm gonna leave that radio here on my bench for a while and see what happens after a bunch of power cycles and other abuse.The MkII just went in my daughter's truck, first with the Deluo GPS (because it has an LED that will indicate fixes, etc) and then with the Garmin (GPS-18), once I verified that all the cabling was correct. So, look for KD7ULI-9. One other thing I did note is that it's reporting 1.3 or 1.4 V; is there a spot for a multiplier (I seem to recall seeing one).I'm also still interested in 2 more T2-135s (for the radio now on my bench, and the one in my wife's car).ClayN7QNMOn Mar 25, 2007, at 9:59 AM, Scott Miller wrote:That's a new one for me. What version is the other radio?
From: tracker2@yahoogroup s.com [mailto:tracker2@ yahoogroups. com] On Behalf Of Clay Jackson
Sent: Saturday, March 24, 2007 10:55 PM
To: tracker2@yahoogroup s.com
Subject: Re: [tracker2] DR 135 Power?
I'll be dipped!!!!
I have another Alinco - a DR135MKII - just plugged it in, and sure
enough, it supplies PLUS 5!!!!
Anyone got any ideas?
Should the old one go back to Alinco?
Thanks in advanced, puzzled in Seattle!
On Mar 24, 2007, at 10:17 PM, Clay Jackson wrote:
> OK - this is really bizzare! I read the docs on my DR135, and it
> says that the middle ring on the front panel jack supplies +5V. So,
> I hooked it up to my Deluo GPS and no light on the Deluo. I
> measured the voltage, and it's MINUS 5V, NOT PLUS 5. Before I go
> reversing leads, I thought I'd check this..
> Anyone seen this? Did Alinco change at some point, or am I just
> Yahoo! Groups Links
- Scott N1VG wrote (way back on March 26 2007)
> Wait... is it a T2-135 that's reporting voltage? They're notI just posted a reply to a more recent message where I replied to Tom W3TMC
> supposed to do that. There's no 12-volt supply to measure,
> and no temperature sensor since I figured people wouldn't
> really care about the internal temperature in their radio.
about "Monitor voltages on boat" where I mentioned about the T2-135 that mine
"shows something like 3.7 volts" when I have it report the voltage. I see
also there's a copy of the T2-135 schematic in the files section. I'll snag
that later and take a look at it. Guess I'll see then where the 3.7 volts is
coming from that my T2-135 reports.
PS - don't redesign the T2-135 just for me, but if you do ever add a voltage
divider so it can report the supply voltage that would be nice. I know the
temperature wouldn't be very meaningful, but I wouldn't mind seeing a
temperature sensor added as well. Maybe it could just be a couple of pads on
the edge of the board and leave it up to the owner to bring those wires to the
outside world and hang a temperature sensor outboard somewhere.
73 es cul - Keith VE7GDH
"I may be lost, but I know exactly where I am!"
> PS - don't redesign the T2-135 just for me, but if you do ever add a voltageWell, if you were using one of these as a digipeater setup, it might
> divider so it can report the supply voltage that would be nice. I know the
> temperature wouldn't be very meaningful, but I wouldn't mind seeing a
> temperature sensor added as well. Maybe it could just be a couple of pads on
> the edge of the board and leave it up to the owner to bring those wires to the
> outside world and hang a temperature sensor outboard somewhere.
> 73 es cul - Keith VE7GDH
be quite nice to keep an eye on your supply voltage and heatsink