Sunday, January 29, 2012

Doodle Labs DL435-30 Reports

A few hams have bought the Doodle Labs DL-435-30 transceiver.

The radio is capable of about 6 Mbps of data throughput utilizing a 5 MHz wide channel in the under-used 420-440 MHz ATV sub-band.

These were first made available in November 2011, so tests have been somewhat limited. However here are some initial conclusions:

At 20-30 feet using a 6 dBi gain omnidirectional antenna a couple different ham groups have seen 1/2 mile to 3/4 of a mile usable non-line of site mobile coverage using a 1/4 wave mag mount antenna. Both reports were in moderate to heavily mature tree neighborhoods.

Keep in mind at this low of a frequency, the height of the antenna will play a role to clear the large Fresnel zone and improve the performance.

The fact that you are not competing with your next door neighbors WiFi, makes these boards great for HSMM. If you can find a few hams in your area interested in it, there are bunch of possibility's for an OLSR network built on these things. Eliminating internet costs at repeater sites, repeater linking etc.

I'd appreciate hearing from other hams who are experimenting with this board wishing to share their reports.

Here is a short video that Kyle, N0KEW made:

Saturday, January 21, 2012

Minitor IV in the Ham Band

Our club repeater is capable of two-tone paging. It uses a CAT-1000 controller.

Many moons ago in the mid 90's we had some Minitor I's pagers re-crystaled for the repeater.

With narrow-banding affecting all public safety channels there will be scads of Minitor III and IV pagers out there, hopefully for cheap.

The municipalities will likely upgrade to the Minitor V as it's narrow band capable.

While the III and IV are frequency programmable, the ones that will be coming out of service will mostly be the 151-159 MHz subband (B) versions. My model: A03KUS9239BC

Never fear, if you use the engineer login function of the pager programming software, you can edit the engineering data, and change it to a 143-150 MHz (A) bandsplit.  (the password is "Taipei")

As for the versions 159-167 and 167-174 I don't think these will lock down in the ham band.

This message thread on radioreference gives you good info in making your own Minitor Programmer. It gives you the pinout diagrams for the Minitors III, IV and V.

When I get a chance to test the sensitivity more in-depth I will edit this page with the results, and mods that I may deem necessary to improve the sensitivity.

Sensitivity is good. Near .4 uV

I haven't been able to track down a service manual, but this explains what to do if yours is not locking.

I have had success programming both M3 & M4's for ham freqs.

Monday, January 2, 2012

HSMM / 802.11 in print

List is a list of known printed HSMM resources for further reading that I have been compiling.

I am curious about articles in print outside of the US. If anyone knows of anything in any of the RSGB publications, etc, I'd appreciate hearing about them.

ARRL- VHF Digital Handbook - Chapter 7 - High Speed Multi-Media Radio by K8OCL
N6GN, "Inexpensive Multi-Megabaud Microwave Data Link," Ham Radio Magazine, December 1989
VE3JF, "VHF/UHF/Microwave Radio Propagation Primer for Digital Experimenters," TAPR/ARLL DCC, 1997
N2IRZ, "Web Pages on Packet Radio," CQ-VHF February 1999
K4ABT, "The Phoenix Shall Rise," CQ Magazine, June 2000
N8GNJ, "Broadband Wireless Internet Access and Amateur Radio," CQ April 2002
KB9MWR, "Inexpensive High Speed Packet is Here," TAPR PSR Summer 2002
WB0ZVV "Propagation Losses Through Common Building Materials 2.4 GHz vs 5 GHz", Magis Networks, 2002
K8IT, "Is All Data Acceptable Data," CQ-VHF Fall 2003
"The Use of Pringles Containers To Enhance Network Security," CQ April 2003
K8IT, "What is HSMM?," CQ-VHF, Spring 2003
W4RI, & K8OCL, "On The Amateur Radio Use of IEEE 802.11b Radio Local Area Networks," CQ-VHF, Spring 2003
KD5OUG, "Columbia Shuttle Recovery and 802.11b," CQ-VHF, Spring 2003
K8IT, "A Low Cost Horizontal Polarized Omni Directional Antenna for $15," CQ-VHF Summer 2003
K8OCL, "Alternative Options for Resolving HSMM Interference Issues," CQ-VHF Summer 2003
AA6JR, "Digital Hamming: A Need for Standards," CQ Magazine, January 2003
N2IRZ, "A Cheap and Easy High-Speed Data Connection," CQ, February 2003
N6CL "IEEE 802.11b: Friend or Foe?" Mar 2003 CQ
N5KM, "High Speed Multimedia Radio," QST, April 2003
KA3JIJ, "Wi-Fi for Hams Part 1: Part 97 or Part 15," CQ, June 2003
KA3JIJ, "Wi-Fi for Hams Part 2: Building a Wi-Fi Network," CQ, July 2003
K8OCL & KA3JIJ, "How To Get Into HSMM" CQ-VHF Fall 2003
K8OCL, "HSMM in a Briefcase" CQ-VHF, Fall 2003
N8UR, "Amateur Radio & 802.11," TAPR PSR Winter 2003
K8OCL, KD6OZH, & VA3BHF, "HSMM Radio Equipment" QEX Nov/Dec 2004
K8OCL, "The Frontlines - HSMM, Part 1" CQ-VHF Winter 2004
K8OCL, "The Frontlines - HSMM, Part 2" CQ-VHF Spring 2004
K8OCL, "The Frontlines - HSMM, Part 3" CQ-VHF Summer 2004
K8OCL, "HSMM and Information Security" CQ-VHF, Fall 2004
WA5VJB "2.4-GHz Patch Antennas," CQ-VHF, Fall 2004
K8OCL & KD6OZH "28 kbps to 9 Mbps UHF Modems for Amateur Raio Stations," QEX Mar/Apr 2005
WA5VJB "Cheap Yagis for 2450 MHz," CQ-VHF, Spring 2005
N2IRZ, "Can HSMM Find a Real Home in Ham Radio" CQ Magazine, April 2005
N2IRZ, "The Digital Circle of Life," CQ June 2005
KD9LA, "IEEE 802.11 Experiments In Virginia's Shenandoah Valley," QST July 2005
K8OCL, "S.H.A.R.K.s and Tsunamis," CQ-VHF Winter 2005
K8OCL, "The Hinternet and VPN Projects," CQ-VHF, Summer 2006
N2IRZ, "Some Encryption is Legal," TAPR PSR Summer 2006
WB8IMY "The Hinternet and openHSMM," QST July 2006
N2IRZ, "Data Encryption is Legal" CQ Magazine, August 2006
N2IRZ, "Building a Decent RF Network" CQ Magazine, October 2005
K8OCL, "What is Happening to the HSMM Working Group?," CQ-VHF, Fall 2006
WB8IMY, "Nontraditional Field Day-You Bet," QST November 2006
K8OCL, "The Hinternet on 5 GHz," CQ-VHF, Winter 2006
N2IRZ, "Wireless Local Area Network Design," CQ Dec 2006
WA6NMF "Use It or Lose It, SHF Edition" TAPR PSR DCC 2007
K8OCL, "The Sociology of Regulations," CQ-VHF, Spring 2007
KL1Y, "The Integration of Amateur Radio and 802.11," May/June QEX 2007
Paul Asadoorian & Larry Pesce, "Linksys WRT54G Ultimate Hacking" July 2007
"Switchless Bidirectional Amplifier for Wireless Communication Systems," Wiley Inter-Science - Microwave and Optical Technology Letters, May 2007
Rob Flickenger, "Wireless Networking in the Developing World" Dec 2007
K8OCL, "Getting on the Internet - Your First HSMM Radio Station," CQ-VHF, Spring 2008
K8OCL, "HSMM and Field Day" CQ-VHF, Summer 2008
K8OCL, "New High-Speed Multi-Media Radio Mesh Networking," CQ-VHF, Fall 2008
K8OCL, "The Hinternet - Protecting HSMM Radio Networks," CQ-VHF, Winter 2008
WB8IMY, "High Speed Multimedia at 3.5 GHz," QST, June 2009
K8OCL, "New Amateur Digital Video (ADV) and Revolutionary HSMM-MESH at Ham-Com," CQ-VHF, Summer 2009
W5IFS, "Bringing Digital Radio to Amateur Radio," QEX, September/October 2010