December 2011 Archives

Damn Cool Antennas

http://www.athena-gatech.org/research/3DINTEGRATION-MATERIALS/index.html

Neat stuff.

CNAME and other data

dns_master_load: m/db.domain:15: mail.domain: CNAME and other data
Dec 23 07:06:45 www named[25842]: zone domain.com/IN: loading master file m/db.domain: CNAME and other data


You're seeing this error and thinking... WTF? Why doesn't it work? What does this mean?

I'll tell you what this means.

The short version: instead of being normal and doing a round-robin of either A records or CNAME records, you thought you'd be slick and round-robin an A record and a CNAME. Since you're being a dumbass, vix leaves you a cryptic message for you to meditate over.

Solution: Pick EITHER "A" records or "CNAMES" to round-robin.

vix: 1 you: 0. Buy vix a beer for even attempting to acknowledge your egregious jackassery.

Ramsey FTR-146

I've just received an email from Ed over a Ramsey in the technical support area. I waited a few days and he patiently scanned the last manual they had for the FTR-146!

I'm sure they'll get a copy of it up on the website soon, but I'll mirror it here as well.
 
FTR-146.pdf

So the basic routine for programming is:

Take the Desired Frequency
Subtract 143.000 MHz from it
Multiply by 100.

For example:


146.940 MHz
-143.000 MHz
-------------------
    3.940
    x 100
---------------
       394


Then you set the PLL divider / diodes to 394 in binary.

394
-256
-----
138
-128
------
10
-8
-----
2

So you put diodes into 256, 128, 8, and 2. (and -600KHz if you're using the repeater).

That's it.

Packet Radio / TNCs

Thoughts/observations:

Speed is important. Baud rates are limited by law, but Baud doesn't equal signal rate; baud is the baseband. Using QPSK, you can double throughput, and you can still throw bits away in FEC if you need to. Phil Karn is a huge proponent of this and for good reason; he had a critical role in developing Qualcomm's satellite-based terminal systems used by truckers everywhere.

6m might be good for this, but easily obtained radios (Motorola Syntor Xs, GE Deltas, etc.) are starting to disappear. Also, they are large, and without a small TNC/node hardware that fits inside the radio, there is little reason to deploy equipment because more parts can break. Of course, the radios themselves need about 30A on transmit, so that would also need to be dealt with in a manner that doesn't impact size and site power requirements.

There's very little reason why we can't push soundcard packet into smaller systems like the Alix line of micro-PCs. We can dedicate an Arduino to software packet detection, another to node/routing, and pass the data on to a host if need be. Or we can load the sound-card engine into memory as a TSR and boot the thing using DOS and a G8BPQ stack. With TNC-X, a KISS TNC, it's possible to do that and more. Ideally, speeds upwards of 19200 and full-duplex are desired. However, full-duplex generally requires real hardware on the "node" side of things, and duplexers are a generally fixed commodity.

Also, proxy ARP may be a better way to use TCP/IP over AX.25, stealing information directly from the NETROM maps or something. For instance, my state net is 44.100.x.x, but good luck trying to actually get any of that to route outside of Mirrorshades.ucsd.edu.

Really, something closer to the mesh-networking systems used for the next generation wireless networking systems would be better. To gracefully handle losing a node and multiple routes present in the network stack. You can't really do that on a Z80 with 16k of RAM at 10 MHz.

IPv6 needs to be implemented at some point, with a graceful handling of IPv6 addresses to allow for compacting unnecessary zeros.

Software TNCs/Minimal TNCs:

AVR:
http://www.byonics.com/tinytrak4/
http://vk7hse.hobby-site.org/wiki/index.php/Main_Page
http://www.garydion.com/projects/whereavr/

Arduino:
http://www.adafruit.com/blog/2010/06/11/aprs-radio-shield-for-arduino/
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1232745624
http://dangerousprototypes.com/2011/01/31/packet-radio-and-the-arduino-radio-shield/
http://wiki.argentdata.com/index.php?title=Main_Page
http://forums.adafruit.com/viewtopic.php?f=10&t=11763
https://sites.google.com/site/ki4mcw/Home/arduino-tnc
http://mhvlug.org/pipermail/mhvlug/2011-April/031359.html

PIC:
http://www.ringolake.com/pic_proj/pic_index.html

HF:
http://www.brazoriacountyares.org/winlink-collection/AGW/PE%20Pro/pehelp/6hf.htm
http://www.tapr.org/pr_intro.html
http://wa8lmf.net/ham/30m-magloop-ant.htm

Packet general:
http://www.kc2rlm.info/soundcardpacket/6modes.htm
http://www.enide.net/webcms/index.php?page=wb8wga-tnc
http://www.amsat.org/amsat/articles/kd2bd/9k6modem/
http://nonbovine-ruminations.blogspot.com/2008/05/ham-radio-internet-and-cell-phone.html
Buck's articles: http://www.buxcomm.com/catalog/ (look down on the left-hand side)
GMSK:
http://www.southgatearc.org/articles/highspeedpacket.htm

Ham general:
http://hamlib.sourceforge.net/

Nodes:
http://digined.pe1mew.nl/?Introduction
http://www.ir3ip.net/iw3fqg/uidigi-e.htm
 -TheNet:
http://vectorbd.com/bfd/thenet/index.html
http://nl3asd.tripod.com/thenet.html
http://g8kbb.roberts-family-home.co.uk/html/thenet_x-1j.html
http://servv89pn0aj.sn.sourcedns.com/~gbpprorg/Radio_Mods/MISC/PACKET/PACKX09.TXT
http://kf8kk.com/packet/jnos-linux/thenet-ops-1.htm
- IP use in TheNet nodes:
http://www.w7eca.net/forum/viewtopic.php?f=84&t=444
 - TheNet replaced by NOS:
http://62.49.17.234/thenet.htm
 - JNOS:
 INP something. I dunno...
edit: Ah, here it is. A European internode protocol:
http://dl6mpg.net/nordlink/ftp/pub/documentation/INP/inp3.pdf
 http://www.langelaar.net/projects/jnos2/documents/inp2011.txt
http://www.langelaar.net/projects/jnos2/news/
Intro to NOS: (packet sizes, numbers)
http://www.febo.com/hamdocs/intronos.html
http://kf8kk.com/packet/jnos-linux/whetting/whetting.htm
FlexNet:
http://www.afthd.tu-darmstadt.de/~flexnet/

DX cluster:
http://www.ab5k.net/Home.aspx
http://www.dxcluster.org/main/index.html

Antennas:
http://wa8lmf.net/ham/30m-magloop-ant.htm


Old Huntspac stuff:

http://www.qsl.net/n8deu/huntspac.htm

Most of the older stuff I saw fall out of use as people got older and fell into different modes / cliques / clubs



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