AmateurRadio.com

Lately I’ve been fascinated by the capabilities of mesh networks. The ability to quickly create ad-hock computer networks could be an invaluable resource for amateur radio operators in general and particularly for emergency communications (EMCOM)

The particular device and software I have been experimenting with is the Linksys WRT54G router and HSMM-MESH firmware from http://hsmm-mesh.org/.

Installing the HSMM-MESH firmware changes the way the Linksys router functions and allows it to automatically connect to other HSMM routers in a mesh network. No special configuration is required after setting your callsign. All TCP/IP configuration is pre-configured, even down to automatically assigning addresses to connecting clients.

Mesh networks are highly fault tolerant. Every router in the network is aware of every other router and has the ability to move network packets through from one unit to another provided there is a link, or chain of linked routers, between them.
In the diagram to the right each router is represented by a numbered circle. If router number 6 were to fail then network packets that needed to move between router 1 and 7 would travel through routers 2 & 3 or 5 & 10 until 6 was repaired. All this happens automatically and quickly enough so that there is no disruption to the traffic.

Anything you can access on a normal computer network can be made to work on a mesh network. Some of the services that have been demonstrated include email, voice over IP (VOIP), video conferencing, file sharing, web servers & groupware applications.

With simple modified antennas the modest output power from the WRT54G (100 to 200mW) can be used to reach distances of many miles or tens of miles with directional antennas. Mounting the router on a mast in a sealed enclosure can reduce losses from long cable runs while running off 12V power makes them compatible with ham radio power sources including solar and wind power.

The example to the left is from NG5V located on hsmm-mesh.org and consists of an omni-directional external antenna and a lawn sprinkler controller box from a popular home improvement store.

Did you know that … Frequencies used by channels one through six of 802.11b and 802.11g fall within the 2.4 GHz amateur radio band. Licensed amateur radio operators may operate 802.11b/g devices under Part 97 of the FCC Rules and Regulations, allowing increased power output but not commercial content or encryption.

I hope to acquire a few more WRT54G routers and put together a mesh network in the Katy TX area as a resource for experimentation and education in an area not normally touched upon by regular amateur radio operators. Who knows what the future holds & it behooves us to investigate this technology and bend it to our own needs.

The Amateur is Progressive … He keeps his station abreast of science. It is well built and efficient. His operating practice is above reproach.

The weather was too nice to sit inside. In the low 70′s with a very slight breeze so after church and a short nap I headed out to try my hand at giving out points in the QRP ARCI Homebrew Sprint. My startup was delayed by curious folks in the lakeside park wondering what in the world I was doing and how I got that string and wire so high up in the nice tall pine trees!

Next to the Lake in the Sun

I checked 40m first with an inverted L end fed half wave and my trusty Stuner (KI6S Stu’s kit) and decided to change to 20m after not hearing much activity. 20m was decent and there were a few of the big gun qrp contest regulars shooting it out. N4BP, K4BAI, K0ZK and a few other were running stations while the little guys like me were mostly doing Search and Pounce. Hey it is fun even if you cannot run a frequency, right?

Sun went down about 1745 local and the mosquitos were quick to find the hole in my hat and attack. This time I remembered the repellant and after a few bites I took time to spray my hat and hair and the backs of my hands. The temperature dropped fast and my hands got a bit stiff pounding out the morse code on my J-47 straight key. 50 degrees is cold for a Florida evening. The darkness also brought out the raccoon family and it was fun to shine my flashlight on them and watch them stand on their hind legs and stare into the night wondering what the funny guy was doing in the dark.

Sun is almost outta sight

40m came to life after sunset and I finished with a respectable 20 contacts for about 3 hours of operation and was able to give some Christmas contacts to the needy fellow contesters who were chasing another certificate. What a great way to spend the afternoon… by the lake in the sun and outdoors playing radio.

This coming Saturday at the Melbourne Hamfest and ARRL FL State Convention QRP ops from around the state will gather for a time of eyeball QSO’s, bragging, show ‘n tell and maybe even some operating from the picnic tables in the park next door!

Looking for Something?

Get there early and do your tailgating and swapping so you can gather at noon near the front entrance. Look for K4UPG’s gawdy yellow hat and come up and say HI! Some of us want to go to lunch together and depending on the number we have a couple places in mind that are nearby the event site.

So come one and all (even the curious) and join the fun.

GATHERING: Front entrance to Auditorium

DATE: Saturday, 8 October 2011

TIME: 12:00-12:15 EDT

Bring some gear if you want to play radio in the park or on the beach later in the day!

UPDATE: As of mid October the new availability date for the ATS-4B is November 2011. Also Steven Weber is developing a daughter board to enable the ATS-4B to decode PSK and CW – which has a January 2012 delivery date. This board can’t be added to the earlier ATS-4A. 

Since late June, Steven Weber’s site at http://kd1jv.qrpradio.com has displayed a short announcement that the next batch of ATS-4a kits will be available in the “fall of 2011″.

On the AT_Sprint Yahoo group Steven has just confirmed that he anticipates having the kits available from late September or early October. He’s expecting the boards to be delivered “soon”.

This will be a revision ‘b’ as there are some minor circuit and layout changes. These include

• a simple AGC circuit to add to the audio output to limit the volume of very strong signals. The AGC should limit the audio output to about 200 mV p-p.
• a change of LCD display, reverting back to the graphics type used in the first run ATS-4 rigs.
• using the 28 pin version of the now scarce 20 pin SOIC MSP430 chip in the new board layout.

These kits enjoy a passionate following – especially the ATS-3b – and they sell out very quickly. Monitoring the AT_Sprint group closely over the next few weeks is the best way to avoid disappointment. An automated alert (such as changedetection.com) when the kd1jv.qrpradio.com page changes might help.

Made one of those last minute decisions to go out and operate in the last minute announced QRP-ARCI Welcome to QRP Event. Packed my trusty Sierra and End Fed Half Wave with Stuner (ala Stu KI6J) and went down to the lake park to take over the shelter. Hurricane Irene’s leftover wind gusts of up to 30 mph made the launching of antenna supports a bit more challenging than normal, but I used a bit heavier sinker than normal and only need one do-over shot to get my two lines in the air.

K4UPG setup for QRP ARCI Welcome to QRP Event 2011

Ran my EFHW in a L configuration with the vertical side up to about 33 feet and the horizontal side going to a nearby tree that was well placed for hanging my antenna. I started on 40 m and shortly after light off worked QRP contest regular W4BAI and felt good about the day. But either the band or the connection quickly began to let me down with signals diminishing quickly into the noise floor. Reluctantly shortened the antenna to switch to 20m and for some reason signals there were even lower in strength… and the antenna was not loading. Hmmmm! Could not get the LED to even dim–what could cause that? Changed my coax from rig to tuner, double checked the banana plugs and all seemed well there, but no match and the signals I heard were WAY down in the mud. I tried to check freq with a QRL? on several spots and called CQ until I was tired of pounding brass with no response heard. No fun…

Then the DUH-tective showed up and solved the problem.

Seems I had not switched the band module in the Sierra and it was still on 40m but the antenna was a 20m EFHW. DUH… my sincere apologies to anyone that got qrm’ed by my QRL’s and CQ’s into a mis-matched antenna. This is one time that I was glad to be running QRP at only 2.4 watts out. A quick band switch and I worked another contest regular K0ZK and then in the next QSO worked NE5DL for both QRP ARCI and SKCC number exchanges in two different QSO’s. Had a bit of distraction in the middle of our first QSO as the rain started and was pounding into my back as the 30 mph winds sent the rain horizontally! A bit more with Dave and I called it a day before the rig got wet. Good thing the DUH-tective showed up.

My sole visitor was a Black Racer about 4 ft away from me!

Hey, I was outdoors, saw a nice looking 3+ft long Black Racer snake about 4 feet from my operating position and made a couple QSO’s despite the goof ups. Who could ask for more?

K4UPG demonstrates how to get to FOBB in STYLE!

While everyone is thinking about antennas, staying cool and planning for the upcoming FOBB, I been checkin out a new ride! What do you think? Buzz- Buzz! Does this shout FOBB or what?

Now I can settle down and get ready for FOBB action with my untested top secret antenna. It will be all out for me again this year! Lookin’ for my friends out there on the ether and praying we don’t get lightning again like we did in 2009.

The last few years 20 meters has been the go to band, but it sure has not sounded very good here in Central Florida during the contest hours, so it will require being ready to shift bands to take advantage of the conditions.

BumbleBee #010 is gonna be listening for you all and lookin’ for the promised post of last year’s results too. CUL and 72– K4UPG

It has been yet another fabulous summer day here in Cumbria. I’m in good spirits and physically feeling fitter by the day. I think the balance issues and “jelly legs” are more an effect of the brain operation than a lack of fitness. Perhaps the same reason my hands often shake badly and cause frustration when trying to attempt soldering.

We decided to go for a walk over the fields to the north of Cockermouth and have a picnic lunch. I took the Taiwanese twins in the hope of making a few radio contacts whilst we were out.

The walk involved some gentle climbing up from the valley. On the way I heard Alan M1EYO/P call on 2m to activate the SOTA summit of Watch Hill G/LD-054 which is almost literally in my back yard. You can see it on the far left of the picture behind me. When I was fit I could walk to Watch Hill though I never did as there was not much attraction in walking for an hour and a half to reach the summit when I could park the car within 15 minutes walk of the top. With no car unfortunately even Watch Hill is out of bounds.

After I worked Alan we carried on walking until we almost reached the Carlisle road, where we found a grassy south facing slope to have lunch. This is probably the only portable site that I can reach on foot from here, though it isn’t a very good site as it is still within the Derwent valley or “Cockermouth black hole” as I call it.

Checking 2m from time to time with a 5/8 telescopic whip on the 2m radio I heard Richard G1JTD/P activating Illgill Head G/LD-029. With a bit of help from Tony G1OAE Richard heard me and we made a contact. I had to use the monitor button to disable the fixed squelch on the H112PLUS which is set far too high. The receiver on the 5/8 telescopic seemed quite poor possibly due to intermodulation or overload. These really are terrible radios!

Alan was going to activate Binsey G/LD-041 a favourite of mine which was in fact the last summit I activated so we waited until he called on 2m and I had another contact. Alan told me he had discovered Rob G4RQJ on the other side of Binsey summit working 40m and setting up to try 4m. I pricked up my ears at the mention of four metres and about a minute later I heard Rob calling on the other H112PLUS so I was able to make my second-ever contact on 70MHz. Binsey is also line of sight from where I was so it was not a DX contact but it was still nice to make a contact on the 4m band.

After that we packed up and walked home. It was a pretty tiring day’s outing for me, definitely the furthest I have walked and the highest I have climbed since my operation. But it was quite a morale booster to get out on such a nice day and do some portable operation. There are even some trees there I could try to get some wire over for some HF operation with the FT-817 in the future, so that’s something to look forward to.