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OK.. I’ve been debating about getting one of these for over a year.

I finally decided to “risk it”…
At about $30 from China on e-bay (look for “joinnew”) .. they are cheap.. but are they good enough for electronics work?

Lets see. Most claim to be 2.0 MP but like mine the are really noisy above 640×480 resolution because the sensors really are 640×480 webcam sensors. They are backlit with 8 white “high brightness” LEDs.

There are issues with the setup, and are not good enough for a true scientific instrument. But a true scientific instrument would be too much for surface mount work, anyway. So one of the “20x-200x” variants would be better for electronics than a “50x-500x” unit, anyway.

Here are the results:

Highest magnification of a offset print catalog that came in the mail:

BATC Digilite board– various parts shot at differing magnifications. The IC is a TSSOP, so it’s pretty small. This shows that I about have hand SMT soldering down.. this is what it should look like at magnification, BTW. (See My other blog for some tips IMHO on how to SMT solder!)

As you can see, it’s quite adequate for board inspection. As the magnification setting increases, the unit needs to be closer to the board. At low (20x or less) magnification the unit can be a couple of inches away from the board. It *may* be possible to actually mount and solder the part on the board when using the USB Microscope at a low magnification setting.. but I’ll have to experiment.

The units come with a poor quality stand, but I plan on getting a stand off a spring loaded arm lamp (I saw a neat one on a small little lamp at IKEA the last time I was in Chicago.. maybe if I ever get back to visit mom).. I suspect if a stand could be fabricated to keep the beast out of the way of the soldering iron, it could actually be used when soldering.. especially with the protective lens cap it comes with on. I’ll figure it out later and post somewhere.

For $30, it’s adequate for electronics use and I actually recommend it as a tool for construction. The only “rip-off” part is that it’s not really usable above 640×480– the higher “res” modes overtax the capabilities of the sensor and are very noisy. (Dont believe the 1.3 or 2.0 MP claims!) Despite this, as you can tell it’s about right for circuit board work.

I used to laugh when someone told me that “right at age 40” you get presbyopia — but I literally woke up one morning 6 months after my 40th birthday, looked down at my (out of focus through my glasses) watch and thought… “oh crap!”…It literally happened to me overnight!… Now I have to take off my glasses to do close in work. I suspect as I further deteriorate with age that it will even get worse.

This seems like an inexpensive tool to cope.

Recommended for the price. Shipping was only one week from China during the “holiday rush” time. Great deal.

Fred Spinner, WØFMS, is a regular contributor to AmateurRadio.com and writes from Iowa, USA. Contact him at [email protected].

Contest time

Well another CQ WW DX CW contest is in the books here at VE3WDM many out there who participate in contests like to set goals. I'm no different but before I set my goals I like to make sure I understand reality first. I am never going to win in these world wide contests I just don't hang in there long enough to get a world class QRP score going. Also I just don't have an "out of this world" antenna setup, I am running with an indoor attic fan dipole. So with that understood my goals for this contest were as follows...
1. Relax and have fun contacting hams all over the world.
2. Run most if not all the contest QRPp at 500mW's.
3. As I finish a contact check out the ham on QRZ.COM and learn about them and their station as I cruz for another contact.
4. Beat my miles per watt record of 8325 miles per watt.
5. Try to beat the 300 contact wall.........never stood a chance as I was doing to much of goal number 1 and 3!!!

I got a late start on Saturday around 10:30 a.m local time, yes the contest did start on Friday but that was dinner and a movie at home with Julie. I was very impressed  how open the bands were like 10m and 15m's those two bands were my staple bands for the whole contest. Below is a highlight of the top contacts for the weekend all with 500mW's.
contact                     Miles                Miles per watt (.5 watts)                  Kilo's


1. ZS4TX                 8368                16737.20                                        26935.91
2. EM2T                   4742                9484                                              15263.91
3. 4O3RR                 4695.2             9390.32                                         15112.26
4. IR8C                    4568                 9137.34                                         14705.12
5. HG1S                   4415                 8831.18                                         14212.41
6. 9A1P                    4360.22            8721.85                                         14036.46
7. S50K                    4358.0              8717.05                                          14028.74
8. IR8C                     4290.22            8580.43                                         13808.86

Keeping track of mileage

 Over all I made 106 contacts out of that 84 contacts were made with 500mW's 21 with 5 watts and one contact on 40 meters with 50 watts. It seems that on 40m I just was not cutting it and to make a contact I had to raise the power to 50 watts. So that was the last contact on 40 meters. As for beating records I was thrilled to contact ZS4TX which got me 16737.20 miles per watt!!!!! Not only that in this contest I was able to make 30 contacts that topped my 8325 watt per mile record. Now running 500mW's did bring my QSO count down as there was lots of repeats I had to do. I just want to thank the op's out there who stuck with me and asked over and over again for my call instead of just moving on.

Earlier I did say that I was never going to win a contest but in closing I have said this before in the blog..............there should be a QRPp category. There is QRP but running 5 watts is  different from pumping out Milli-watts. Well change does take time and maybe in time there will be a spot just for QRPp. 

        106                                             77                               23,408








Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at [email protected].

Did you know that you’re running out of time if you’ve been planning on working ARISSat-1? Why do you ask? Well, it’s estimated to be re-entering in January or February 2012. So now is the time to use the on board repeater or get an SSTV pic.

The satellite was deployed back in August and since then has lost about 60km of altitude, and is estimated to be losing 1.5km per day. This is due to increased drag on the craft from increased solar activity on the atmosphere. From Southgate ARC:

The orbit period changes about 30 seconds per day, and that will increase steadily. Be certain to update your tracking program Keps from Space-Track or CelesTrak before each pass. They issue revised versions 3-5 times daily.

That’s a lot of revisions, so make sure to stay on top of them if you want to work it. Plus any telemetry data the engineers can get from the satellite will help in future flights. If you want more information on ARISSat-1 feel free to check the related stories below or you can check out these stories done here for more info.

73.

Rich Gattie, KB2MOB, is a regular contributor to AmateurRadio.com and writes from New York, USA. Contact him at [email protected].

Tonight I made my first digital-mode contact! Using PSK-31, I worked special event station VE3FRST (“UN International Year of Forests”) on 40 meters. Michael, VE3NOO, kindly emailed me this screenshot of the moment:

A few things had me fumbling around, but over the next few contacts I started to get the hang of it. After VE3FRST I went on to work another station in Ontario, one in Alabama, and one in France with PSK-31 before retreating to my key and working Costa Rica with CW.

I highly recommend the DigiMaster PRO PLUS! It comes with a USB soundcard and was very easy to hook up and get going with Ham Radio Deluxe/Digital Master 780. It performs both as a CAT interface and as a data interface, and works great.

I learned the hard way that not all CAT cables are worth buying. Buy cheap, and you’ll buy twice like I did. My first one was a cheap cable from “affordableradio” on ebay. It uses the Prolific chipset for the serial-to-USB interface. Stay away from Prolific! The only thing prolific about it was the prolific number of spontaneous disconnections and “Blue Screen of Death” crashes. I tried everything — every driver I could get my hands on, I/O buffer adjustments, etc. but it was junk. I couldn’t bring myself to sell it to another ham, so I returned it. No refund yet, but here’s hoping.

Todd Mitchell, NØIP, is a regular contributor to AmateurRadio.com and writes from Minnesota, USA. He can be contacted at [email protected].

Well, I shoulda gotten out into the detached garage this weekend and worked DX.. but the weather was nice on Thanksgiving and the day after (when I had to do family stuff thankfully) and freaking cold and windy the rest. (I can heat it but it takes some planning…)

So instead, I decided to catch up on building/hacking projects from the past and ones on a weird tangent to my current construction project the BATC DigiLite.

The past project is rebuilding my ORIGINAL 1998 Dallas Semiconductor “iButton” WS-1 One Wire weather station w/humidity and the tipping rain gauge (it’s been ten years since I had it up and running last– it took me several hours to find it!). I plan on stripping all of the one-wire garbage (sorry, it never worked reliably with any cable length at all) except for the temp sensors out of both units and embedding an AVR and running RS-485 to the units.. and connecting to an Ethernet connected Arduino to report to APRS and/or Weather Underground. My kids are interested and I’m also adding a Real Time Clock and a Barometric Pressure sensor (to the inside unit since my house isn’t pressurized) and having a fairly complete station. No PC will be required and the little 8-bit processors are misers when it comes to power usage!

I want to get my older boys interested in the systems engineering aspect and the coding and the weather station is starting to peak there interest a bit. Keeping my fingers crossed!

This is actually connected to the BATC project in that I want to use the Arduino development system and the extensive library of code instead of taking time I don’t have and writing everything from scratch on a PIC or AVR (non-Arduino). I discovered that except for the bootloader and the sometimes bloated code in some of the libraries (most are very good) that it is not that much less efficient than straight-C on the AVR’s. (The Arduino environment conceals a full open source GCC C++ complier and yup, you can write in C and C++.. you actually are even under the “sketch” environment– but they conceal that well to beginners.) Yes they are small, and slow.. but at $2.50-$6 a pop for DIP IC’s that you can hack together in a hurry.

Here is a picture of some of the AVR based toys I’ve bought and put together over the years. The “real” Arduino shields are recent.. for prototyping your own stuff they suck (since one header isn’t on 0.1″ centers.. DUH!).. but since they are a standard certain modules are cheap (at least the non-Italian “bad labor condition” clones from China) and readily available. You can put together relatively inexpensively and quickly since most of the core code can be borrowed from libraries.

In relearning the coding, I wrote a lot of odd stuff. Here is an example of a ATMega644 (in an Sanguino PCB) doing a bunch of stuff.. talking to a LCD (via the library in 4-bit mode) and shifting data to a 74HC595 driving the LED’s in a row.. reading from a Dallas (yes, one-wire) Temperature Sensor (those are great units if not parasite powered!) with two debounced switches… doing math for the PLL synth (the numbers in the left bottom corner).. Here is a video:

Sanguino board doing all sorts of stuff

Anyway.. I am going to use the ShiftOut function on the Arduino to program the "Ultram Technologies" PLL board (That I bought preset to 1255 MHz) for the DigiLite LO on the DVB-S modulator. I was going to use that Arduino 2009 / "DFRobot" (clone) LCD Shield to do a GUI. But most of the time the little AVR will be idle. So sad. So I came across the Nootropic Designs Video Experimenters Shield and I thought… really since the BATC project needs the real time MPEG-2 chip in the Hauppage PVR-150 board.. I might as well also do a callsign overlay.

Since the Arduino 2009 has a FTDI chip on it.. it has USB to Serial functionality on it. I can poll the UART at the Vertical Blanking interval and if it receives a PLL tune command, that can be sent to the PLL and displayed (for a short time?!?) on the Video overlay as well. For now, the video overlay shows a callsign message and the system timer in ms for debugging.

Here’s a shot of that too:

Arduino/Nootropic Designs Video Experimenter Shield Overlay Example Video

The video callsign overlay is done with this "sketch":

#include <TVout.h>
#include <fontALL.d>

#define W 136
#define H 104
TVout tv;
char s[32];
unsigned int n = 0;
int index = 0;
int messageLen = 34;
char message[] = "...W0FMS Digital Amateur Television";
char saveChar;
void setup() {
tv.begin(NTSC, W, H);
initOverlay();
tv.select_font(font6x8);
tv.fill(0);
}
// Initialize ATMega registers for video overlay capability.
// Must be called after tv.begin().
void initOverlay() {
TCCR1A = 0;
// Enable timer1. ICES0 is set to 0 for falling edge detection on input capture pin.
TCCR1B = _BV(CS10);
// Enable input capture interrupt
TIMSK1 |= _BV(ICIE1);

// Enable external interrupt INT0 on pin 2 with falling edge.
EIMSK = _BV(INT0);
EICRA = _BV(ISC11);
}


// Required to reset the scan line when the vertical sync occurs
ISR(INT0_vect) {
display.scanLine = 0;
}


void loop() {
saveChar = message[21];
message[21] = '\0';


for(int x=6;x>=0;x--) {
if (x<6) {
tv.delay_frame(3);
}
tv.print(0, 92, " ");
tv.print(x, 92, message);
}
message[21] = saveChar;
saveChar = message[0];
for (int x=0; x<messageLen; x++)
message[x] = message[x+1];


message[messageLen] = saveChar;


sprintf(s, "%dms ", millis());
tv.print(0, 0, s);
}

Assuming that you’ve downloaded the Enhanced TVOut Library into the \arduino\libraries directory.. the code above is how simple something like this can be with Arduino and the libraries. This compiles to less than 10K or 1/3 of the ATMega328P (on the Arduino 2009, or 1/6 of the ATMega644 on the Sanguino).

This is why I like Arduino. It took me less than an hour to build the shield and write the example code. I am not easily impressed and even that isn’t that impressive.. but the Closed Captioning decoder example is impressive. It works really well.. and is so simple really for what it is.

I know that hopefully some day the TV input portion of the BATC project will go from SD analog to SD/HD full digital and a little hack like this won’t be appropriate anymore. But I’ve had a blast with it and I really hope I can leverage it into a learning experience for the kids also.

Pick up a few of these Arduino gadgets (now you can buy them at Radio Shack if you are in a hurry– and want to pay 3x the clone price from e-bay/China) and give it a try– it’s quick fun experimentation and I can now see the ZEN.

73, Fred W0FMS

Fred Spinner, WØFMS, is a regular contributor to AmateurRadio.com and writes from Iowa, USA. Contact him at [email protected].

Saturday: Well, I did switch on the radio this Saturday morning. But had only limited time. First QSO was made late in the afternoon on 10m. But 10m did close early, so down to 15m. Only 9 QSOs made till now only with the USA and Canada. Hopefully I do have more time for it at Sunday.

Sunday: Switched on the radio and computer late Sundaymorning. But no time till about 14:30 UTC. I concentrated on the 10m band and made some QSOs. Most of them with the USA and Canada again. CW is more luck then wisdom for me, the computer does most of the work. Then I came across the signal of 5X1NH Uganda, a couple of calls later I made the QSO. New DXCC all band and on 10m. 10m closed early again at about 19:30 UTC, so I end with 29 QSO. 23 on 10m and 6 on 15m. Did unfortunately not have much time for this international event this year. But after all am lucky with the new DXCC.

Bas, PE4BAS, is a regular contributor to AmateurRadio.com and writes from Groningen, Netherlands. Contact him at [email protected].

As most folks know, we had the Thanksgiving holiday here in the US last week. It’s a tradition to not only eat turkey with “all the fixin’s” but also have have some leftovers for a few days after that. I’ve got the same for my blog mostly with respect to things that were still around after Thanksgiving. So, in no particular order:

I did my usual “playing around” in the big CQ World Wide DX contest this past weekend. This is one of the “main events” in the ham radio contesting world, and while I didn’t really have time for more than just a few hours of making contacts, I did note a few interesting/amusing/annoying things. In this contest, you get points for working stations in other countries (not your own) with what’s called a “multiplier” based on the country and something called a zone. (The term “DX” refers to a station from another country.) Without going into too much detail, it’s relevant to know that there are 3 zones within the US. Your score is calculated by multiplying your points (number of contacts with stations outside your country) by the zone and country multipliers. You are allowed to work stations in your own country for the multiplier value, you just get zero points for doing so. It’s important to note that while you can get the 3 zone multipliers that are available for the US by working stations in Canada, if you want the country multiplier credit for working the US you must work a station in the US. Since it’s a zero-point contact, what I try to do is to find a US station that’s not busy and work them, since I don’t want to take them away from working their DX. Most operators understand this and have no problem with it, but on at least one occasion I called a US station who was CQing (repeatedly) with no responses only to have him respond “SRI ONLY DX”. In other words, he was telling me that he would not make a contact with me.

As noted, I only work US stations when they aren’t busy which was the case here. A complete contact with both stations exchanging information during a CW contest (which this was) takes around 20 seconds or less. So instead of helping me out by just completing the contact, he probably saved maybe 10 seconds by sending that other information. So much for good sportsmanship. (For what it’s worth, I noted his call and will avoid making contact with that station in the future, even in contests where non-DX contacts “count”.)

Also during the contest, I was working stations on 20 meters just calling stations and tuning up the band to find the next station. It’s not unusual, while doing this, to have another station that is doing the same as you are, and depending on what band you are on and the propagation conditions, you’ll sometimes be able to hear the other station. Sometimes, you wind up moving with that other station (sometimes more than one) and working the next station up the band either just before or just after that station repeatedly. Normally this isn’t a big deal, but I got stuck behind the equivalent of tractor-trailer truck on small road doing 20mph below the speed limit:

There was a station that would usually call the DX station before me and work him first. No problem. However, unlike the normal orderly contact sequence (which for this contest is very simple: a signal report, normally 599, then your zone, which is 5 for me, meaning my half of the exchange is send in CW as “TU 5NN 5”, with “TU” meaning Thank You, acknowledging that I got the contact information from the other station) he’d send something like “TU 5NN 4 4 4 TU DE (his callsign) (his callsign) (his callsign) 73″. You might send your callsign if you think the DX station didn’t get it, but the accepted way of doing it is prior to the other information and only if you think the other station might not have gotten it correctly. What wound up happening is that the DX station (who is normally working stations very quickly; remember that I mentioned it normally takes 20 seconds or less to complete a full contact) would hear the “TU 5NN 4 4” then assume that the other guy was through sending and send his “TU QRZ?” (meaning he got your info and is moving on), only to realize the guy was still sending. In one case I heard the DX start to send his final sequence 3 times “TU …  TU … TU” before the other guy finished.

The problem with doing this is that you slow everyone down, and while it’s not against the rules to do this, it’s another example of poor sportsmanship. The station doing this had to know that he was slowing everyone down. (And before everyone jumps on me, this was definitely not a new contester, so it wasn’t a case of “not knowing better”.) I’m not sure why he was doing this, but finally I just gave up and jumped far enough up the band so that he was no longer “in front of me” anymore. (In fact, I went way up the band and started tuning down, meaning that while I might cross paths once more, it would be in opposite directions.

I’ve got a few more leftovers to go, but I think I’ll just put them back in the ‘fridge for next time.