I'm interested in packing a 5V buck converter into a DE-9 shell, to take 12V in and provide power to the attached GPS - typically 60-80mA, but it would be nice...
8412
Wes Johnston, AI4PX
ai4px
Sep 1, 2009 7:11 pm
I'd be interested in something like that potted in epoxy for my motorcycle to run the nuvi. Anyone know of anything off the shelf? Wes ... -- Wes ... We are...
8413
Jason KG4WSV
joeuser66
Sep 1, 2009 7:17 pm
... Disembowel a (preferably cheap) cig lighter power adapter. A USB model will be 5V. It may or may not fit inside a DB9 shell, though. -Jason kg4wsv...
8414
Paul Vittorino
wiz8
Sep 1, 2009 7:26 pm
Wes, Take a look at <http://www.gilsson.com/garmin_gps/cables/GUSB5V-B.htm> Paul...
8415
gsdatplace
Sep 1, 2009 7:30 pm
... Simplest and cheapest I've found (and I bought everyone I could) Duracell makes a beautifully tiny cigarette lighter to USB charger adapter. 12V in, 5Vdc...
8416
James Ewen
james_ewen
Sep 1, 2009 7:38 pm
Okay, time to play some more... I'm looking to add some telemetry to the OT2, and need to play a bit to figure things out... ... So, my thoughts are to play...
8417
Keith VE7GDH
ve7gdh
Sep 1, 2009 11:13 pm
Scott - have you ever looked at the SWR on the PX-777? I'm trying to put together a group order and one potential buyers asked about the SWR on the 2M band. 73...
8418
lists@...
ke4nyv
Sep 1, 2009 11:38 pm
Keith, I can't speak for anyone else, but I know my testing showed that the stock antenna was worse than a dummy load. I know shape doesn't always tell the...
8419
Erich J. Ritzmann
va3xto
Sep 2, 2009 12:10 am
For 5vdc 1 amp, I am using a 7805 with a couple of caps -- 0.33 uF between the the input and ground, a 0.1 uF between the output and ground -- tied together on...
8420
Jason KG4WSV
joeuser66
Sep 2, 2009 12:26 am
... A 7805 is a linear regulator, not a switcher. It is noticeably less efficient than a switcher. It is the easiest regulated supply to build, though. -Jason...
8421
Lynn W. Deffenbaugh (...
ldeffenb
Sep 2, 2009 12:31 am
And with 12v vehicle power, the efficiency isn't much of a concern, provided that you can dissipate the generated heat. If you're going with battery supply,...
8422
Scott Miller
n1vg
Sep 2, 2009 12:47 am
I don't have a good setup for testing SWR on a low-power setup, but yeah, I'm sure you can do a lot better than the stock antennas. I've got some better...
8423
Jason KG4WSV
joeuser66
Sep 2, 2009 1:15 am
On Tue, Sep 1, 2009 at 7:30 PM, Lynn W. Deffenbaugh ... Not exactly. I used a 7805 to drive a power hog of an old GPS in my old truck. The battery (yeah, big...
8424
Lynn W. Deffenbaugh (...
ldeffenb
Sep 2, 2009 1:41 am
... Being an APO user in my two tracked vehicles, I neglected to consider those that would let it run 24x7. Also, being a Florida resident and it being summer...
8425
Scott Miller
n1vg
Sep 2, 2009 3:51 am
There's no local packet display at this point - every time I start working on that I run into some roadblock, but I forget now what it is. I could probably...
8426
James Ewen
james_ewen
Sep 2, 2009 4:16 am
... I figured as much!, but I thought I might have a chance somewhere... perhaps I'll just put a digi on the bench, both with dummy loads, and watch for the...
8427
Scott Miller
n1vg
Sep 2, 2009 4:25 am
For bench testing, I typically just hook the audio output line to the mic input on the PC and run AGWPE. Scott...
8428
James Ewen
james_ewen
Sep 2, 2009 4:29 am
... I've never gotten AGWPE operational... I can't get past the broken english/poor instructions. I've got the OBED digipeater sitting there ready to go back...
8429
Barry L. Lankford
barryinal
Sep 2, 2009 8:54 am
... You may get away with this linear power supply scheme if all you're powering is a tracker and a low power hockey puck GPS, but if you try to get much more...
8430
Erich J. Ritzmann
va3xto
Sep 2, 2009 11:09 am
Thanks for the detailed explanation, Barry. To clarify: I use this 7805 arrangement to power the puck GPS. I left it powered for hours without heat build up,...
8431
rds_6
Sep 2, 2009 12:58 pm
The Motorola 8505518V01 Wideband VHF 136-174 MHz antenna is THE antenna for VHF handhelds with male SMA connectors (actually Motorola's connector differs from...
8432
Chris Kantarjiev
kantarjiev
Sep 2, 2009 1:50 pm
Thanks for all the responses. I specifically said "buck converter" because I've used 7805s and know how much heat they put out. I guess I was hoping that...
8433
gsdatplace
Sep 2, 2009 1:57 pm
... Just a a point of note, (I think I remember seeing it hashed out here before sometime) if your looking to power a Nuvi from the OT2 it doesn't need a...
8434
Matt Lee
ve7mlx
Sep 2, 2009 2:08 pm
Hi Group: I want to set-up a T2 as a Digi and I am wondering if anyone has a trick for sending out local announcements with either a status text or a separate...
8435
Tom Tengdin
tttengdin
Sep 2, 2009 2:13 pm
Mouser electronics lists many different DC-DC converter lumps as one option. National Semi has a "simple switcher" with online design guidance. You put in your...
8436
Bruce Harvey
ve1ii
Sep 2, 2009 2:16 pm
Hi Chris, Have a look at this eBay item. I bought several and they seem to be similar to what you are looking for. They pop apart easily and could be...
8437
Mark Cheavens
mcheavens
Sep 2, 2009 2:26 pm
On one of my "to do" lists has been to update the firmware in my T2-135 to the "latest development build" (June 09) for a while. I finally got around to it...
8438
Mark Cheavens
mcheavens
Sep 2, 2009 2:30 pm
What you were looking for was the post (sorry I don't have the original) about: http://www.dimensionengineering.com/DE-SWADJ.htm They also have a buck...
8439
Lynn W. Deffenbaugh (...
ldeffenb
Sep 2, 2009 3:10 pm
I'm not sure how the latest build would have improved reception, but if anyone else is as curious as I was, I've generated coverage maps for KC5EVE for his...
8440
Scott Miller
n1vg
Sep 2, 2009 3:12 pm
Yes. Have you looked over the information on scripting? http://wiki.argentdata.com/index.php?title=Scripting Scott...
