... A nasty hack would be to use a lookup table which would convert the tangent value to degrees. That's basically what I did to get the 16 compass bearings. I...
898
scott@...
n1vg
Sep 1, 2006 12:01 am
I want to get the bearing calculated down to at least a couple of degrees, since it'll potentially be used for automatic antenna aiming (e.g., tracking an...
897
James Ewen
james_ewen
Aug 31, 2006 11:38 pm
... Have you had a look at the distance calculation routines we used on the HamHUD? We were very limited in the math functions on the PIC used it that device,...
896
James Jefferson Jarvis
elliotmcg
Aug 31, 2006 3:33 pm
I'd really like to get a tracker2 something board. Thanks, -Jim...
895
scott@...
n1vg
Aug 31, 2006 4:26 am
The Proto C and T2-135 boards came in today, a couple days earlier than I was expecting. I thought I had some ST202's on hand, but I can't find any, so I...
894
scott@...
n1vg
Aug 30, 2006 7:37 pm
I can try that - cos() is already there, but there's some performance penalty in conversion to float and calculation time. I'm not actually using...
893
Wes Johnston, AI4PX
kd4rdb
Aug 30, 2006 7:17 pm
Although your way is probably faster (and close enough for government work), why not take the COS of the average latitude for figuring convergence? It would...
892
scott@...
n1vg
Aug 30, 2006 5:03 pm
Thanks, been looking for something like that. Just ordered a copy. _____ From: tracker2@yahoogroups.com [mailto:tracker2@yahoogroups.com] On Behalf Of James...
891
James Jefferson Jarvis
elliotmcg
Aug 30, 2006 4:13 pm
There is a very good book on this subject called: "Math Toolkit for Real-Time Programming" by Jack Chrenshaw It's actually about embedded systems, not...
890
scott@...
n1vg
Aug 30, 2006 5:33 am
My first attempt at a distance calculation (using a floating point implementation of the haversine formula) required 5 trigonometric function calls, two square...
889
scott@...
n1vg
Aug 29, 2006 8:37 pm
Jason reported the same thing. I'll see if I can get some shorter screws that'll still be long enough to hold it all together. Scott _____ From:...
888
scott@...
n1vg
Aug 29, 2006 8:36 pm
I suspect it's going into XMODEM-1k mode or something. I don't have a serial port sniffer on my Linux box to check it out. Anyone know of a good one? Scott ...
887
Mark Miller
markm76017
Aug 29, 2006 8:17 am
... I see. Nothing has changed in world of AX.25. I typically set my deviation with the high tone, or with both tones alternating. I have always had good...
886
Keri Morgret
morgretk
Aug 29, 2006 2:47 am
I was the one that had the license plate "This is not my dad's callsign" when I was in high school! Put in the T-Hunting features, and the Tracker2 can even...
885
Jason Rausch
ke4nyv
Aug 29, 2006 2:40 am
... I still like "Tracker2: This Aint Your Daddy's TinyTrak!" Oops, did I say that? Kidding aside, I like the SAK idea. It really is an APRS SAK type of...
884
scott@...
n1vg
Aug 29, 2006 2:27 am
Who's coming to DCC in Tucson this year? They had a couple of speaking slots open, so I volunteered to give a 45 minute talk about the T2, and show off some...
883
scott@...
n1vg
Aug 29, 2006 2:23 am
... Yeah, that's been my experience too. When fed into a radio, it shouldn't be a problem - it's low-pass filtered in the radio. Does make it a pain to ...
882
Mark Miller
markm76017
Aug 29, 2006 1:58 am
... Ok that will be fine. ... It gives you a signal, but the baseband audio is not so good to tune with. I would much rather be working with sine waves...
881
scott@...
n1vg
Aug 28, 2006 11:07 pm
... I'm using SecureCRT 4. If the transfer completes with no NAKs, it *should* be ok. Could be the .bin file I've got up there is bad. I'll send you one to...
880
Mark Miller
markm76017
Aug 28, 2006 5:07 pm
Scott, That would be great. My shipping address is: Mark Miller 5612 Trail Crest Dr. Arlington TX 76017 or just bring one with you to DCC. Do you think you...
879
scott@...
n1vg
Aug 28, 2006 1:53 pm
Another victim of RoHS... the new part number (for Digi-Key) is NJM#2211-D. And it looks like the price has dropped - you'll pay a whopping 96 cents for an...
878
Jon
c0j
Aug 28, 2006 8:31 am
... That sounds exactly like what was happening to me a while ago, though I didn't try sx on its own at the time. John ...
877
Mark Miller
markm76017
Aug 28, 2006 8:12 am
Scott, What is a good source for the NJM2211? I want to get another one since I broke pin 6. I checked Mouser and Digikey and they both seem to be out of ...
876
Mark Miller
markm76017
Aug 28, 2006 7:54 am
Scott, The two screws that tighten the two parts of the enclosure are too long and touch two pads on the PC board when tightened. I am going to fix mine by ...
875
Mark Miller
markm76017
Aug 28, 2006 7:29 am
... I have tried again with CRT version 4.1.10 with no luck. The upload completes but the OT2 continues to send ACKs. The LED alternates green/red. I can...
874
Cap Pennell
ke6afe
Aug 28, 2006 1:26 am
Yes, it is correct that any WIDE1-N should be treated as though it was heard as WIDE1-1. If a APRS user sets WIDE1-1 our "new" North American system intends it...
873
scott@...
n1vg
Aug 28, 2006 1:00 am
I've got the ack thing fixed - it works fine now with no {. I actually did that a while ago, but haven't put the new firmware up yet. I've tested a few...
872
scott@...
n1vg
Aug 28, 2006 1:00 am
Yeah, that was intentional, but I'm not sure if I'll keep it that way. AUTHLIST can now display its output on a single line, so you at least have the option of...
871
scott@...
n1vg
Aug 28, 2006 12:57 am
I've been testing the xmodem upload some more, and I've found that it works fine on my Linux box using 'sx' from the command line. When 'sx' is launched from...
870
Mark Miller
markm76017
Aug 27, 2006 11:45 pm
... Ahh yes, I understand now. Yes a general digi on/off would be ok, but now I understand what needs to be done to disable digipeating. The reason this came...
