I was more than surprised to find Palstar showcasing a transceiver at the 2013 Hamvention. Palstar is well-known for their tuners and their receiver, the R30A, but they have never sold a transceiver to my knowledge.
As you can see from the photos, the Palstar TR-30 has a simple faceplate with a touch screen display. It is all aluminum, thus is very light. TR-30 is rated for 20 watts PEP and has an 11 pole filter on board.
I hope to review one once it is in production. Palstar expects the TR-30 to be available August 2013.
(Click to enlarge)
When I asked about the price, the told me a range of $1,500-2,000 US. (Gulp!)
The TEN-TEC Model 506 Rebel 20/40 meter QRP Transceiver (Photo: TEN-TEC–click to enlarge)
Today, at the QRP ARCI convention–Four Days In May–TEN-TEC will announce a new QRP transceiver based upon a completely different platform than any others rigs they have in production: a QRP radio, built on the chipKIT™ Uno32™ (Arduino-based software) to be known as the Model 506 Rebel.
And, folks, I’ve been lucky enough to get my mitts on a prototype…!
The Model 506 Rebel
The TEN-TEC Model 506 Rebel is an open-source (meaning, anybody can program it), factory-built QRP transceiver based on a Chip Kit Uno 32 Arduino-compatible prototyping platform, which serves as the main processing unit that holds the Rebel’s program. (For those of you not familiar with the Arduino series, check out this article.)
And I have to admit, I love the concept: TEN-TEC delivers a factory-built, uber-simple transceiver, with just enough programming to reliably get you on the air with a basic radio (see details below). Users then have full access to develop and program the Rebel via an open-source platform, themselves. No need to wait on firmware revisions; firmware, in a sense, will be crowd-sourced! That’s to say, it uses online collaboration–a great idea.
According to TEN-TEC, the programming environment is very safe. Users can tinker with code without fear that they might harm their Rebel 506. The original base program can be re-flashed to the radio at any time. So if you can’t get past an error, you can always revert to a safe default copy.
In addition, even if you don’t have any idea how to program, someone has already created a web-based email group where users can upload and share code packages, and you can select someone else’s programming to test drive. Click here to join the group.
The Rebel is a CW-only transceiver that operates on 40 or 20 meters. The user changes bands by moving jumpers inside the chassis, mounted on the PC board.
The basic Rebel comes with no frequency display. When you turn on the radio, it comes up on the QRP calling frequency of 7.030 MHz or 14.060 MHz, depending on which band is selected. There is no VFO, but a DDS chip that is highly stable and that allows the Chip Kit Uno 32 to select a frequency upon which to operate. Of course, since the Chip Kit controls the DDS chip, you can re-program how the Rebel manages frequencies.
(Click to enlarge)
Initial impressions
Last week, TEN-TEC sent me a prototype of the Rebel to Beta test. I’ve had it on the air several times–I’ve also popped the cover and given it a thorough inspection and workout. I’ll share my initial impressions below. I’m not commenting, however, on some specs like filtering, as they have not been finalized for production and are still subject to change. The unit I tested, keep in mind, was a prototype; production units will be still more polished and incorporate changes Beta testers have provided.
(Click to enlarge)
Front Panel Layout
The front faceplate of the Rebel 506 is reminiscent of TEN-TEC QRP Kits, gloriously clean and simple. There is a large tuning knob in the middle with a SELECT button on the left and FUNCTION button on the right. Both buttons are large enough that you could comfortably use them even if wearing winter gloves. Above each button is a vertical row of just three LEDs: green, yellow and red. These colored LEDs simply indicate the position of the function/selection buttons.
(Click to enlarge)
Function button controls
Band Width
Step Size
User-programmed functions
Select button selects
Bandwidth: Wide, Medium and Narrow
Tuning steps: 100 hz, 1 kHz or 10kHz
User, U1, U2 or U3
There are only two knobs: one for volume (AF gain) and one for RIT (+/- 500 Hz). There is also an ON/OFF simple toggle switch, and a rather classy touch from TEN-TEC–namely, a small LED light in the TEN-TEC logo itself. And that’s all, folks–bare-bones design.
No frequency display
The Rebel 506 does not come with a frequency display. However, there are features to help you understand where you are on the band as you turn the encoder:
As you tune within the selected tuning steps, the LED in the TEN-TEC logo flashes as you pass each step; for example, if you’ve selected 100 Hz steps, then when you pass each 100 Hz step, the LED in the logo will flash once. When you reach either band edge, the LED stays lit. Again, a nice touch.
When you turn on the (factory default) Rebel, the frequency starts on QRP calling frequencies 7.030 MHz (40M) or 14.060 MHz (20M)–of course, you could change these with programming.
There are (already) third-party frequency displays that plug into the Rebel’s board, an easy addition.
Since I had neither frequency display nor frequency counter, I simply used my SDR’s waterfall display to locate where I was on the band. It’s also fairly easy to count the steps with the logo’s red LED.
Rear view (Click to enlarge)
Connections
On the rear panel, you’ll find a standard BNC antenna connection, a key/paddle port (1/8″), a speaker/headphone port (1/8″) and a standard DC port (10-15V reverse polarity protected) that equates to 4-5 watts output depending on supply voltage.
Key/Paddle input from the factory is only for straight key, but you can modify the code to make it a paddle input. Also, the headphone/speaker port defaults to headphone use from the factory, but there is a small jumper on the PCB that can me moved to drive a non-amplified speaker.
On production units (not on my prototype, however, nor on those at FDIM) there will be a CW side tone volume control pot via a small hole in the side of the Rebel’s enclosure. Also, production units will have a hole on the rear panel to allow for access to the ChipKit’s USB port.
The PCB has hooks, test pins, and inputs for the following:
Battery read pin: reads 0.20 of the supply voltage.
Power-out read pin: reads 0.50 of the RF pickup
Code read pin: ties to low level audio line, can be used to build a CW code reader
CW-speed read pin: DC voltage used to determine approximate speed of CW routine
All connections of the Chip Kit Uno32 are available on the top of the PCB.
The unit accepts Arduino-compatible Shields for such things as:
Prototyping
Displays
Audio DSP
Evidently, the Rebel has a lot of memory space for writing CW memory-keyer functions or whatever the user desires/dreams up. Even a voice synthesizer could be installed in the Rebel; indeed, I believe there are many mods and possibilities for the Rebel. The greatest limitation might simply be…the imagination of the user.
TEN-TEC was clear with me about the goal of the Rebel 506: “To provide a platform for users to experiment and to learn to program using Arduino-Compatible Code.”
The Rebel has a small form factor (Click to enlarge)
I like it!
I have thoroughly enjoyed putting this little radio on the air. Let’s be clear, though: this is no Argonaut VI or Eagle, nor should it be expected to be. Receiver performance is on par with other QRP kits and rigs of its class. The Rebel is fairly sensitive and the noise floor is fairly low. Selectivity is adequate for most conditions, although I imagine crowded conditions could overwhelm this modest receiver.
When I had the Rebel on the air, I engaged in a bit of a rag-chew and found the audio quite pleasant from my GoalZero portable amplified speaker. And other than needing to adjust the side tone volume, the Rebel was ready to go, straight out of the box.
Criticisms? Well, it’s just too early to have many. I’ve passed along all my frank observations to TEN-TEC and they’re actually addressing them now (yet again, one of the many benefits of an American-based radio producer). If this were a $900 rig, performance-wise, I would complain about selectivity. But I’m willing to bet it’s at least as good as the Index Labs QRP ++ I once owned. In fact, though it’s not a full-featured general-coverage rig, it has that same sort of bare-boned fun factor the Index Labs radio provided me, along with many other QRP kits.
Field? I would totally take the Rebel into the field or backpacking. I have a hunch it uses less than 200 milliamps on receive. It’s modestly-sized and built like a little tank.
The Rebel lives up to open-source philosophy
The Arduino chipKIT Uno32™ Prototyping Platform
Here is the amazing part about the Rebel: TEN-TEC only shipped me the radio–no connectors, no adapters, no power cord. At first, I thought I’d have to find an appropriate plug and solder my own power cord, not to mention figure out what other adapters I would need for my key/speaker…but I didn’t. The power port is very standard; the same one my LDG ATU, Elecraft K2 and KX1 use, with standard positive tip polarity. The Rebel’s antenna connector is a BNC, speaker and key ports are standard 1/8″ and the ChipKit board has a mini USB connection. The top cover is easy to remove–even the toggle switch, LEDs and selection buttons are all standard and easy to access for servicing. Everything is standard!
But it doesn’t stop there. The Rebel is truly an experimenter’s radio, and is meant to be. The programming is completely open-source and TEN-TEC is encouraging and facilitating users to tinker with the code and make hardware modifications at will.
Open-source technology is all about alteration and collaboration, the kind of environment we hams have always embraced. In the open-source world, nothing is proprietary; rather, everything is transparent, standard, accessible; supporting changes and modifications of every stripe. And in my humble opinion, it’s about fun. On these points, the Rebel delivers.
I have done some scripting in my past, but I am no professional programmer. Though many of my Maker friends had been urging me to give it a go, I hadn’t jumped on the Arduino band wagon until, well, now. The Rebel will serve both as a great intro to Arduino Compatible Code and a truly fun QRP rig. If TEN-TEC is lucky, this little rig may actually nudge some of my Maker friends to get their ham radio tickets.
(Click to enlarge)
Price
TEN-TEC will be announcing the price of the Rebel 506 in Dayton, literally in just a few hours. I have no idea what it will be, but I’m fairly sure it’ll be competitive with other dual band QRP transceivers and kits on the market. I’ll post an update here when the price has been published. Stay tuned…
UPDATE: Pricing for the Rebel is $199 US.
By the way, if you’re at FDIM or the Hamvention this year, drop by booth 411 in the Ball Arena: I’d be happy to talk with you about the Rebel further (and my radio-based non-profit, Ears To Our World).
Disclaimer: Just to be clear, although I own TEN-TEC (also Elecraft and Yaesu) products, and although I Beta test for TEN-TEC on occasion, I have no formal relationship with TEN-TEC. Nor am I compensated by the company in any way. The opinions in this article and others on this site are frank and my own; they are not those of TEN-TEC.
In this music video, Col. Chris Hadfield (VA3OOG/KC5RNJ) records a revised version of David Bowie’s Space Oddity, on board the International Space Station:
As if he wasn’t cool enough already. We hams couldn’t ask for a better ambassador than VA3OOG.
A new kit from the Four State QRP Group and David Cripe (NM0S)
NM0S’s Cylcone 40M QRP transceiver. Look for it at Four Days in May!
Arising from Dave’s entry in QRP ARCI’s 72 Part Challenge Design Contest in 2010, the Cyclone 40 is an enhanced version of the original design. The transceiver designed for the design contest had 72 total parts, performed well, and won honorable mention. This improved version has less than 100 components and even better performance! The kit features all through hole parts and easy assembly. The receiver is a superhet design with very good sensitivity and selectivity, and tunes the entire 125 kHZ CW segment of the 40M Band – and does so at a comfortable tuning rate. A frequency readout is included so you know where you are at all times.
This is a complete kit, including the enclosure. A high quality board package includes the pc board, front and back panels, the sides, and top and bottom all of which make up the enclosure. The control and jack labels are silk screened in white letters and vividly contrast with the black solder mask, and the holes for the connectors and controls are pre-drilled. The ends are “dovetailed” together making a very rugged, easy to build, and attractive enclosure.
Features and Specifications
General
Enclosure: A very nice predrilled and silkscreened enclosure is included. It’s easy to assemble and looks great.
Ergonomics: Smooth solid tuning, a quiet receiver with QSK and well behaved AGC. Nicely laid out front and rear panels.
VFO: The VFO is a simple PTO design, is very stable, and also quite easy to build
Sidetone: Included!
AGC: Audio derived, fast and smooth.
Frequency Range: 7.000 – 7.125 typical.
Tuning Speed: 10kHz/knob turn typical.
Stability: 300 HZ the first 5 min after power up, less than 10 HZ/hour after that.
QSK: Fantastic QSK! Full Break in, excellent muting, really fast!
All Through Hole Parts There are NO SMT parts in this kit, and only three easy to wind toroids.
Dimensions: 4.4 x 3.6 x 1.9″
Power Connector: 2.5×5.5mm coaxial, center positive. Should be fused at 1A, fast blow at PS
Antenna connector: BNC
Receiver
Configuration: Superheterodyne, 11 MHZ IF, 4 Crystal IF Filter.
Sensitivity: MDS (Minimum Discernable Signal) -125, Typical, below the normal 40M band noise level.
Selectivity: Four crystal, 500 HZ IF filter
IMD3: 90 dB typical, better than most commercial gear!
IP3: +10 dBm typical – another very good number
Frequency Readout: 3 or 4 digit CW, 1 kHz or 100 Hz resolution (user selectable), developed by Adrian Hill, KCØYOI.
Band Edge Marker: A band edge marker is heard at 7.001 MHZ
Headphone Jack: 1/8″ stereo, standard earbud/Walkman® headphone compatible
DC Current consumption: 30 ma typical at 13.6 VDC.
Transmitter
Configuration: Stable, Wide Range VFO (PTO design), Efficient Class E Final.
Spectral Purity: All harmonics and spurs less than 50dB below the carrier.
Output Power: approximately 4W into 50 ohms
DC Current consumption: 500ma typical at 13.6 VDC Will operate down to 9v DC.
Key Jack: 1/8″ stereo, grounded shell, switching the tip keys TX. Contacts accessible for an internal add-on keyer
Kits should be available at QRP ARCI’s Four Days in May conference at Dayton, and will be for sale on the Four State QRP Group’s web site approximately May 20th. The final price hasn’t been determined yet but should be less than $100 plus shipping.
The Juras are located north of the western Alps, predominantly in France. (Photo: Wikimedia Commons)
I just received this message from Olivier Parriaux (F4GLD):
This supply is ready!
This Thursday [09 May 2013] we will activate, if time permits, the beautiful summit of Cret de gout which is located in the Jura mountains in JN26WD.
F/JU-004 – Cret de la Goutte Locator JN26wd
46.15140 ° N (46 ° 9 ‘5.0 “N) Longitude 5.86560 ° E (5 ° 51’ 56.2” E) 1621 meters, 5318 feet
Scheduled departure was 0300 TU [UTC] you should be able to follow the ascent via APRS.
We use + or – frequency QRP only Phone on 7/14/21/28 MHz bands depending on the propagation and F4OQU F4GLD Olivier Gilles.
HF Station KX3 5W max, Buddistick antenna, battery and three …
We also try to activate UHF
VHF F0FNC Laurent around 144,290 in SSB.
FT-817 5w max, DK7ZB antenna
We planned things on the air from 5h30/6h30 TU [UTC]
Hoping to see you on the air on Thursday.
73’s to all.
Like Olivier, if you’re planning a SOTA or QRP DXpedition of any stripe, contact me and I’ll be happy to post your announcement here on QRPer.
One of the highlights of my trip to the Dayton Hamvention last year was attending evenings at Four Days in May (FDIM), a QRP convention sponsored by the QRP ARCI that rather conveniently coincides with the Dayton Hamvention, which I try to attend annually. Though scheduling makes it difficult for me to attend all of FDIM’s daytime presentations, the camaraderie and innovation one discovers at the evening sessions is wholeheartedly worthwhile.
Last year, I snapped quite a few photos at FDIM which I planned to post following the Hamvention. Unfortunately, shortly after the Hamvention, my laptop began displaying signs of an early demise. In haste, I archived my photos on a portable drive, where they remained buried for a year. I just rediscovered this photographic treasure, and thought I’d share it with readers; looking through them rekindled my enthusiasm for FDIM 2013, which starts next week!
A quick look at FDIM 2012
A great characteristic about FDIM is the array of QRP products offered by QRPers for the community. More often than not, these products are fairly priced, and often in support of the QRP community rather than major profit-making ventures.
For example, the North Georgia QRP Club produces affordable wood stands for QRP rigs. They’re incredibly simple, but fully finished and beautifully designed, just the thing to prop up your QRP portable at the right angle for desktop use.
Speaking of wood products–one vendor last year featured an amazing array of wooden paddle pieces and even custom wooden tuning dimples (spinner knobs) for the Elecraft K2 and K1.
As you can see from the photos, each piece is perfectly finished and has great character, as one might expect of real wood.
Dennis, being a hard-core QRPer, trekked with ham gear in tow; he brought his kits to FDIM:
There were a variety of keys and paddles to be seen, of course; offerings range from the home brewed to gorgeous Italian Begali designs:
One paddle that really caught my attention was QuadraBug, a creation of WB9LPU. What makes this gem stand apart from other “Bugs” is that not only will it form “dits” automatically, but it also forms “dahs.” Truly, an amazing work of engineering. I searched the web for a video of the QuadraBug in action, but found nothing. [UPDATE: Thanks, Yan for finding a video! See video below.] This year, I’ll take a video if I’m fortunate enough to see it again.
Home-brew galore
There were an amazing number of home-brewed projects on display, and even a home-brew contest. I didn’t capture photos of them all, but I did manage to snap a few.
One that really caught my eye (being a shortwave receiver enthusiast) was David Cripe’s (NM0S) version of Hutch’s Radio. The original Hutch’s Radios were built by US and British POW’s in WWII. Built in canteens, often from confiscated parts, these radios gave POWs hope by allowing them to tune in the outside world, via the BBC WS and Voice of America. In the spirit of the original, David challenged himself to build his version prior to FDIM, with original parts of the era, and in “secrecy.” Secrecy? As many of the components had to be purchased from suppliers on eBay, David tried to intercept all of the incoming packages without his wife noticing. His success was brief–alas, his wife discovered the mission–but fun; still, the end result was a very cool piece of historical recreation with a humorous story to match:
Of course, FDIM featured loads of QRP transmitters, receivers and transceivers; here is Dwayne’s (AK4P) 40 meter transceiver, built in a SPAM container:
Terry Young, K4KJP, built a very cool pocket 20 meter transceiver in an Altoids tin:
And Alan Shapiro, NM5S, should have won a prize for the most compact set of CW paddles. These paddles are so small that they can be clamped onto your log book. Much to my surprise, they were amazingly easy to use, and would be a great addition to any field-portable radio:
FDIM 2013
If FDIM 2012 is any indication (yes), this is a mere sampling of the stuff you’ll see at Four Days In May 2013. I encourage you to attend: if nothing else, make a little time either Thursday, Friday or Saturday evening to visit the evening displays at FDIM–they’re free and open to the public.
If you can’t attend, I hope you’ll earmark your calendar for a future date. I do plan to bring my camera again this year and will share some photos. Hopefully, I’ll post them a little earlier this go-around!
Hope to see you at FDIM and the Hamvention. For the third year in a row, I will be representing my charity, Ears To Our World (ETOW), at an inside exhibit at the Hamvention. We should be in booth 601 in the East Hall. Please feel free to stop by and introduce yourself! (And if you feel so inclined, you can even donate a few bucks to our worthy cause.) See you there–!
I meet some very interesting people in radio circles. My friend Harold Johnson (W4ZCB) is undoubtedly one of them.
Last year at my local ham radio/DXer club meeting, members were asked to bring photos of shacks and rigs, and describe our evolution as ham radio operators. In the series of photos that arrived at the following meeting, one in particular stood out: Harold Johnson’s radio tower in post-war Japan.
Johnson’s tower stood almost thirty feet tall and supported a 20 meter Yagi which you can see in the above photo. Johnson, who at the time operated under the callsign JA7HJ, also had a little ham shack built. The shack materials–including the tower, Johnson recalls–cost him “three bottles of Scotch for the army quartermaster…I paid the Japanese builder $15 or $20 for the complete enchilada.” This tower was built entirely of wood: the vertical members were 2′ x 4’s, the slats were 1′ x 3’s.
Of course, the tower didn’t have a mechanical rotor; instead, Johnson climbed inside the tower, lifted the wooden boom, rotated it manually, and placed it back on the uprights.
When asked how he powered his station, Johnson pointed to the wheeled generator in front of the radio shack in the photo. “The generator was called a B6B–it produced 24, 120, 240, and 480 volts, and was rated 10 kW.” When I asked how he managed to procure the generator, he replied that he “borrowed it from the flight line, which was about 300 feet away.”
Johnson’s Nashville, TN shack, circa 1955/56. (Click to enlarge)
I always enjoy hearing personal histories in radio and I didn’t doubt for a moment that Harold Johnson’s would be intriguing, so I asked if he’d tell us how his interest in radio began. So, here’s Johnson’s story in his own words:
As a preteen, (and poor as a church mouse during our previous
Depression), I would visit my aunt and uncle in the summer, likely due to the fact that they were farmers and had food to eat. They owned an old Philco radio that had shortwave bands and I was intrigued with the phone amateurs on the 80 and 20 meter bands. Often, I could hear both sides of the conversation, after I found out that they were on various different frequencies, being crystal controlled back then! My…How times have changed.
In high school, I found another afficianado, and can recall melting “Woods metal” in boiling water and floating a piece of Galena on it until it returned to a solid and [thus] made my own crystal set. WWII had started by then, and I would listen to the ground-to-air communications between ships in Lake Michigan and pilots taking off and landing on them. Great DX, perhaps 10 miles away.
In 1943, I had graduated from high school and joined the US Army Air Corps. Went through training and was still in training (…to be a pilot until they counted airplanes and pilots and decided they had enough of each […so instead] turned me into a B-29 gunner). The war was over whilst [I was] still in training and I “retired” in November 1945. Went home and found my high school sweetheart, married, went back to school to finish my education and started the Johnson family. Still married, and
to the same girl. What a sweetheart to have put up with me all these years. [No kidding, Harold!]
Went back in the US Air Force in 1949, this time became a pilot, and just in time to go to Korea for a year. However, during training, had to learn the Morse and if you learned to 13 WPM, you had a free hour and didn’t have to attend class. That overcame my obstacle to amateur radio, and I took the exams in 1950 and became W9PJO. Our rules at that time were that you had to hold a “class B” ticket for a year before you could take the “class A” exams. That year I spent in Korea and Japan and managed to obtain my first foreign call, JA7HJ.
Returning home to wife and by that time two children, I took the class A exams and became W4ZCB. I decided that I enjoyed flying, (at least most of the time), and decided to make it a career. The ensuing years, I was always on and in the air, and usually spent the winters in Alaska and the summers in the Canal Zone, anything to practice how to be miserable. Lebanon in 1958, Vietnam in 1968 and by 1969 decided that I should start doing something else before my luck ran out.
During my last 4 years of service I flew an Army four star around the world four times. Fortunately he was Ted Conway, W4EII, and we mutually enjoyed operating under a couple dozen different call signs from a lot of exotic (and several not so exotic) places. Had G5AHB back when the 5 was reserved for foreign nationals. We were good friends after we both retired (on the same day; I always liked to say that he couldn’t stand to serve without me) until his death in 1990.
I started a small company manufacturing electronic test equipment for public utilities; spent the next 20 years doing that (and enjoying a much more stable life with family and radio.) Managed to work all the countries (entities these days) there are, win a few contests from a contest station I built and operated for 10 years. (80, 40, and 20 in the front room, 15 in one bedroom and since 160 and 10 were seldom open at the same time, they shared the other bedroom. To change bands, you just changed chairs. Five big towers and Yagis, a VERY high maintenance hobby in the lightning prone state of Florida. (Let’s not mention hurricanes!)
Retired again to the beautiful mountains of North Carolina in 1986. A much more modest station these days, but active on all the HF bands. I really enjoy building homebrew radios and maintaining daily schedules with friends worldwide. Can be found daily on 21.203 with G3XJP and often joined by other builders of the magnificent PicaStar transceiver designed by him. Sixty-three years a ham, still enjoying it. It’s guided my careers and interests. What a wonderful hobby!
W4ZCB’s shack today is based around his home brew SDR transceiver, the PicaStar. (Click to enlarge)
Over the past few years, I’ve gotten to know Harold Johnson; I must say, he has to be one of the very few hams I know who knows the inner workings of tube/valve radios as well as he does the highest tech radios on the market, a rare talent indeed. If you’re trying to learn a bit more about the BC-348 series of radios and trying to diagnose a problem with it, Johnson’s your guy. If you’re trying to build an SDR from scratch, he’s also your guy. And clearly, if you want to hear a fascinating account of a life influenced by radio, this is most definitely your guy.
A news release from Andy (G6LBQ) & Adrian (2E0SDR):
I have a news release about the NEW version of the world famous G6LBQ multiband transceiver. Andy G6LBQ is releasing the MKII version through a partnership with Adrian Lane (2E0SDR). They have formed a company called DX KITS, it will trade from www.dxkits.com, it is currently in the development stage.
We are having manufactured industry quality PCB’s for the NEW linear board that us 3 x RD16HHF1 Mosfets, along with a digital VFO board coming soon that utilises the SI570. Andy then intends to update the Filter Boards and also create a new and improved exciter board, both the Linear Board & the new VFO board will be compatible with the existing exciter board that will become obselete when the new MKII exciter board is relesed later this year.
There are lots of new development going on with Andy (G6LBQ) and DX Kits for a very brite future and large upgrade for the G6LBQ and Homebrewer all round. DX Kits will be the sole worldwide supplier for the G6LBQ MKII and all of Andy’s future developments. Please visit us at the G6LBQ Yahoo group at groups.yahoo.com/group/G6LBQ/ and keep an eye on our developing site at dxkits.com. We are awaiting our first batch of PCB’s, then the sky is the limit for the HF Homebrewer.
A colossal sunspot on the surface of the sun is large enough to swallow six Earths whole, and could trigger solar flares this week, NASA scientists say.
The giant sunspot was captured on camera by NASA’s Solar Dynamics Observatory as it swelled to enormous proportions over the 48 hours spanning Tuesday and Wednesday (Feb. 19 and 20).[…]
“It has grown to over six Earth diameters across, but its full extent is hard to judge since the spot lies on a sphere, not a flat disk,” wrote NASA spokeswomanKaren Fox, of the agency’s Goddard Space Flight Center in Greenbelt, Md., in an image description.
[S]ome of the intense magnetic fields in the sunspot region are pointing in opposite directions, making it ripe for solar activity.
“This is a fairly unstable configuration that scientists know can lead to eruptions of radiation on the sun called solar flares,” Fox explained.
Propagation in the higher portions of the HF band could be very interesting over the course of the next few days. If a solar flare erupts, however, it could make shortwave listening quite difficult.
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A news release from Andy (G6LBQ) & Adrian (2E0SDR):