Posts Tagged ‘kits’
Not the answer I was looking for
May 11th, 2012 | 
Author: 
Awhile back when I assembled the Amateur Radio Kit Roundup, I listed Heathkit as a potential source, and even answered a question in the comments about their rumored return to Amateur Radio stating that I would contact someone about it. I sent an email off asking how they were doing in this regard. Unfortunately I never received an answer. Here is some sad news at the ARRL explaining why (courtesy of a mention at eHam.net this morning). I was not a ham when Heathkit was in its heyday, but knew plenty of people who were, and like most of you, I was impatiently awaiting news of their return to the hobby. Hopefully this is not a permanent end, but only a temporary setback.
Nice addition to the kit roundup
I constantly search for new kit sources for the kit roundup list. Today I stumbled on this one:
Kit Radio Company KRC-1
–Kit Radio Company – KRC Kits. http://kitradio.co.uk/page2.htm This UK-based company produces several interesting kits including receivers,
transmitters, and accessories. All prices are in British Pounds.
- KRC-1 superhet receiver. This receiver covers MW, and SW (160 thru 40 meters). Built in a 5-stage process for education. 1) Medium wave TRF receiver driving an earphone. 2) Audio amplifier providing speaker output. 3) The TRF receiver is converted to an IF amplifier 4) Mixer/oscillator converting the receiver to a four band superhet. 5) BFO to enable CW/SSB to be resolved. £65.99 plus S&H
- KRC-2 regenerative receiver. Covers 1-30 Mhz. in 3 bands. Regeneration with a difference. The regeneration setting on the KRC-2 is unaffected by the receiver tuning or the antenna coupling. How is this achieved? The regenerative stage is fixed at 10.7MHz and used as an IF amplifier. This one reminds me of the Radio Shack Globe Patrol regenerative I built as a kid. £54.99 plus S&H
- KRC-4 beginners TRF receiver. 2 bands; 800KHZ to 1.6MHZ and 4.0 to 8.0MHz. A TRF receiver designed for the beginner. Using a reflex circuit this receiver employs only one transistor. Band selection is achieved with two plug in coils, these are pre-wound and both coils come as part of the kit. £24.99 plus S&H
- KRC-5 direct-conversion 80 meter receiver. Designed around two well proven chips the SA602 and LM386. Employing a VFO that can be calibrated to fulfill your requirements. £25.99 plus S&H
- KRC-X-1 QRP transmitter. Covers 7, 10 and 14MHz. All you do is plug in a different crystal assembly to change band and re-tune the antenna. 0.5 to 2 watts output. £69.99 plus S&H
- KRC-X-2 80/160 meter transmitter. A simple cost effective transmitter covering either the 80 or 160 meter bands. It provides 2 Watts of RF power when operating from a 12 Volt supply. With a peak output rising to 8 Watts if external modulation is applied. Please specify 160 or 80 meters when ordering. £33.99 plus S&H
Kit Radio Company KRC-X-2
Is Radio Shack returning to its roots?
1975 Radio Shack Catalog
As a kid, I used to enjoy the arrival of each year’s Radio Shack catalog. I would thumb through and think of all of the things I could do with the bounty of electronics within. I know, I know, Radio Shack was a joke compared to some of the larger electronics retailers of the sixties and seventies, but for a kid in the boonies of upstate NY, it was all I had. I started with the solderless 65-in-1 kit, and graduated to bigger and better things. I built several of the P-Box kits, and tackled the Globe Patrol regenerative SW kit when I was about 11. I wish I still had them. I found an archive of the catalogs in my uncle Win’s basement at one point. They were in his ham shack (S.K. W1PVC) neatly organized on a shelf. Now, years later, the archive exists online. For those of you that like to reminisce, go check out RadioShackCatalogs.com. Unfortunately looking through these is a little depressing as we not only miss what RS once was, but also miss some of the now defunct competitors out there, like Lafayette Radio (although there appears to be a company called Lafayette Radio on the web, selling mobile and marine gear).
I mentioned in my introduction post, that I have some potential hams in the family. I recently went to Radio Shack to purchase a Gordon West technician study guide for the better half (yes, they have it), and was surprised at the HUGE display of Arduino, Make, and Parallax products. Now, I know that The Shack, as they like to be called now, was carrying a small assortment of these things already, but they have GREATLY expanded the selection. In the Manhattan RS that I went to, there was the equivalent of 2 vertical wall sections, and a third section on an endcap. I hear that they had a large display at last year’s MakerFaire.
Will this lead to some Amateur Radio gear, or at least some related accessories? Time will tell. They surprised us once before with an unexpected return to Ham Radio in 1990 with the HTX-100. Maybe someone in Fort Worth is looking at the companies they are trying to compete with by becoming a cellphone store and realizing that they aren’t doing well either (Best Buy?). I have also noticed that some of the stores that eliminated the component section, seem to have now added the component cabinet that some stores had retained back to their stock.
Someone on the repeater the other night called Arduino, Make, Raspberry Pi, etc., the modern erector set. I would like to believe that. I think it’s time to start building some things. Makes me feel like I’m 11 all over again. 73!
–Neil W2NDG
Is there an inexpensive kit for the Technician 10M phone band?
In the comments for the kit roundup, a reader asked me about this, so I looked through the list again, and found the lowest priced kit available that will cover at least a portion of the 28.300 to 28.500 range. The YouKits TJ2A seems to be the only choice, but only after adding the accessory crystal pack #2. He pointed out the inexpensive MKARS80 as an example of a great SSB kit for very little money, but not covering a band available to a technician-class ham. On a side note, I wonder if it is possible to create an MKARS10? Here is my reply:
I’m not sure why there aren’t more SSB kits for 10 meters. In the list here you can try the Youkits TJ2A (http://youkits.com/ or the eBay store) and build it for 10 meters by ordering crystal option package #2. They only show one optional package on the website, but two in their eBay store for some reason. According to their specs this will give you 28.326 – 28.420. You might have luck contacting them directly and trying to order one with the correct BPF components for 10 meters with the initial kit package and save a few $$.
Another suggestion is to step up to general. I started studying as soon as I got my tech, and took the test about 6 weeks later. Tech-to-general is a pretty easy jump (mush easier than general-to-extra) and will give you the ability to use some of these other kits (like the aforementioned bargain-basement MKARS80).
A third option is to pick up a used Radio Shack HTX-10 or HTX-100 rig on eBay or at a hamfest. I have a Magnum-257 in the car (same rig as the HTX-10) that I picked up for $125. That rig with a modified 11 meter whip has been heard in Europe, Africa, and all over South America from here with 25 watts. In fact, my first contact on HF as a new ham was with France! I wish that good fortune on any new ham. It certainly got me interested in getting more great contacts.
Whatever path he chooses I’m sure it will be enjoyable. Once you make that first contact you catch the fever, and can’t wait for more.
–Neil W2NDG
EDIT: Andrew AC8JO reminded me about the Softrock RX/TX SDR kits, which can be built with 17, 12, and 10 meters at 1 watt. (you select the bands when you build, the kit comes with parts necessary for all). The kits are $89 when available. See http://www.kb9yig.com to order, or the Yahoo Group Softrock40 for announcements of upcoming availability or units to purchase. I hear that it is a moderately difficult build for a newbie, but there is PLENTY of info online to assist you.
Amateur Radio Kit Roundup
QRPme.com Lil' Squall Transceiver
Kit building appears to be on the rise again. With so many people talking about it on the club’s repeater lately I decided to put together a good list of sources for kits that are currently available. Many of these are for QRP operation, but a few are full-featured professional transceivers (Elecraft, DZ). On the beginners side there are a few sources that stand out: Hendricks has a great assortment of kits, including some SSB QRP equipment. QRPme offers the inexpensive, easy-to-build tuna-can products, and I would like to make special mention of the Four State QRP Group NS-40 which has the coils etched right into the PC board! What a great idea! I’ve covered trasmitters, transceivers, and some receivers here. Some accessories are mentioned in the source descriptions.
Revised 4/25/2012 Added Zao.jp. and AmateurRadioKits.in
-Hendricks QRP Kits http://www.qrpkits.com/
- BitX20A/17A SSB Transceiver. The BitX20A and BitX17A are complete SSB kits with board, all parts, digital display and custom powder coated and punched case that is based on the BitX20 that was designed by Ashlan Farhan. Output is about 10 Watts. $180.00 + S&H
- PFR-3a 3-Band Portable Field Radio. Bands : 40 meters, 30 meters and 20 meters. Tuning range: Full band coverage. Mode: CW only. $240.00 + S&H
- NADC30/40 CW Transceiver. Nearly All Discrete Component CW Transceiver for either 30m or 40m. Tuning range ~ 60 kHz. Power output: 3.5 watts. Full Kit: $130.00 + S&H
- Ft Tuthill 15 Meter CW Transceiver. Two 60 KHz tuning ranges, ~ 21.000 – 21.060 and 21.075 – 21.135 MHz. Power Output: 5 Watts. Complete Kit (w/ case and digital dial) $130.00 + S&H
- Red Hot 40 Meter Transceiver. A high performance QRP CW transceiver kit for the 40m band. It has been designed to operate well in the presence of large out-of-band (shortwave broadcast) and in-band (contest station just down the road) unwanted signals. Frequency range is a (nominal) 70KHz segment of the CW end of 40m. Output power 0 to 5 Watts nominal (7 Watts typical). Full Kit: $250.00 + S&H
- MMR-40 CW/SSB Transceiver. The MMR-40 features both CW and SSB operation, the first rig kit in this price class to do so. Transmitter power out: 6 watts CW/pep typical at 13.8V supply. Typical tuning range: SSB: 7.280 to 7.150 MHz CW: 7.100 to 6.700 MHz. Full Kit: $225.00 + S&H
- TwoFer Plus CW Transmitter. The TwoFer Plus is a simple transmitter that will be offered on 40, 30, and 20 meters. The kits come with crystals in the qrp region of the band. It will put out approximately 1 Watt using a 2N3053 transistor for the final. It has a crystal based VXO that will give about 1.5kHz on 40, and 3kHz on 20. It also has a built in T-R switch on the board that mutes the receiver during transmit. We have upgraded the kit with a custom prepunched case that was designed by Ken LoCasale, WA4MNT. The kit comes complete, with all parts, connectors, case, knobs, wire, and our usual commercial quality double sided, plated through, silkscreened solder masked board. $35.00 + S&H
- DCxxB Board Only Trasceiver Kit. These radios are the next generation of the popular DC40 transceiver that was also designed by Steve Weber. The kit will come with 1 crystal for the band specified. 7.040 for DC40, 10.120 for DC30, 14.060 for DC20. Board-Only kit with decals: $30.00 + S&H
- Scout Regen Receiver. A simple 2 band regenerative radio receiver that is capable of receiving signals from 3.5 to 11 MHz. A complete kit with L shaped aluminum chassis, quality doublesided silkscreened soldermasked board, all parts, hookup wire, board mounted battery holder. This kit is ideal for the first time builder. $50.00 + S&H
-YouKits http://youkits.com/. YouKits seems to be working on several new projects. Watch the website for new additions.
- TJ2A 2 Band SSB / CW Handheld Transceiver. Can be set to operate on 2 bands from 160m – 10m. Output power 3.5 – 4 Watts. Rechargeable. Many band combinations available. $169.00 + S&H
- TJ4A 4 Band Backpack HF Trasceiver. Available in 2 TX models: 80,40,20,15, or 40,20,15,10. New general coverage receiver capability. 20 Watts output (adjustable), SSB, CW, AM. Full Kit: $399.00 + S&H
-MFJ http://www.mfjenterprises.com/
- MFJ-8100K World Band SWL Receiver Kit. Regenerative general coverage receiver covering 3.51 – 4.31 MHz, 5.95 – 7.40 MHz, 9.56 – 12.05 MHz, 13.21 – 16.4 MHz, and 17.6-22 MHz. $79.95 + S&H
- MFJ-93xxK QRP Cub Transceiver Kits. QRP Transceiver available in 80, 40, 30, 20, 17, or 15. Output 2 Watts (except 1 Watt on 17 and 15).
-Vectronics (MFJ) http://www.vectronics.com/Categories.php?sec=209.
- Too many kits to list here. They sell several different Transmitter, Receiver, and Transceiver kits, as well as shortwave converters for the car. A couple of the items seem to be kit versions of MFJ products.
-Ramsey Electronics. http://www.ramseyelectronics.com/
- Similar assortment to Vectronics above, with several transmitter, transceiver and receiver projects.
-Genesis Radio (Australia). http://www.genesisradio.com.au/order.html not all kits are available. Many are listed as sold out, but I assume will become available again. Prices are in Australian dollars. This is the only one currently available:
- G11 5 band SDR Transceiver Kit. Power output 10 W. SMT components factory pre-assembled, buyer to assemble only large through hole components. Price in AUS$: $299.00 + S&H
-Tony Parks, KB9YIG. http://www.kb9yig.com/ Although everytime I look at this page, the kits are listed as “Check back soon” I have been told that if you email Tony he has kits available. These are the kits that the GSB ARC was building. 2 are currently available:
- SoftRock RX Ensemble II Receiver Kit. The SoftRock RX Ensemble II Receiver Kit includes the components for building the kit for LF, 180kHz through 3.0 MHz, operation or for HF, 1.8 MHz through 30 MHz. $56.00
- SoftRock RXTX Ensemble Transceiver Kit. The SoftRock RXTX Ensemble Transceiver Kit provides a 1 watt SDR transceiver that can be built for one of the following four band groups: 160m, 80m/40m, 30m/20m/17m or 15m/12m/10m. $74.00
-Ten-Tec. http://www.tentec.com/categories/Products-by-Area-of-Interest/Kit-Building/ Ten-Tec has 8 Radio kits available.
- QRP Transceiver Kits (20,30,40, or 80 meters). 3 watts power output. covers a 50 kHz segment determined by you at the time of construction. With pre-labeled and painted case. $124.00 + S&H
- 9 Band Regenerative Receiver. 1.760 – 1.990 MHz, 3.3 – 4.150 MHz, 5.5 – 6.9 MHz, 6.9 – 8.5 MHz, 8.5 – 11 MHz, 10.1 – 13.2 MHz, 12.5 – 16 MHz, 14.7 – 18.5 MHz, 18.5 – 21.5 MHz Integrated audio amp IC for clean robust audio from internal speaker or headphones. includes parts, circuit board, assembly manual, battery holder, speaker, complete enclosure, and knobs. $93.00 + S&H
- 4 Band Regenerative Receiver. 5.9 – 6.4 Mhz, 6.9 – 7.4 Mhz, 8.5 – 10.2 Mhz, 11.5 – 16.5 Mhz. Comes with finished front panel. No knobs or case. $41.95 + S&H
- Digital Readout Superhet Receiver. 100 Khz to 20 Mhz coverage. This is the radio that Jay, KC2YSK built and wrote about in the Log previously. Several option available to improve performance from 3rd parties. $205.00 + S&H
- Any Band Direct Conversion Receiver Kit. Includes all of the parts and instructions to let you build the receiver (or change it to) ANY band of your choice (160, 80, 75, 40, 30, 20, 17, 15, 12 or 10 meters). $39.00 + S&H
-Elecraft. http://www.elecraft.com/
- K3 Modular Kit. The K3 is Elecraft’s top of the line. Available in 10 and 100 watt versions and with a multitude of options. The modular kit comes with mostly pre-assembled boards that need to be plugged in. The K3 kit starts at $1549.95 and increases depending on what options you choose.
- KX3 Modular Kit. The KX3 is Elecraft’s newest transceiver. Similar to the K3 in features, but in a compact portable package. This is a modular kit like the K3 that requires you to assemble the pre-soldered boards. Many options available. Starts at $899.95
- K2 Kit. The K2 is available only as a full kit. This is not a modular kit like the two above, but a full kit for the advanced kit builder. The K2 is a full-featured transceiver available in 10 and 100 watt versions, and with many options. Basic kit starts at $739.95
- K1 Kit. The K1 is a small portable CW transceiver available as either a 2 or 4 band rig. You choose which bands you want at the end of the kit build. Adjustable output from 0 to 5 watts. The 2 band model starts at $299.95
- KX1 Kit. The KX1 is an ultra-portable CW transceiver. Available with 2 bands in the basic model, and upgradeable to 4. ! to 4 watt output. Starting at $299.95
-Hamtronics. http://www.hamtronics.com/menu_products.htm
- Hamtronics offers a variety of VHF and UHF receiver and exciter kits as well as many other interesting items.
-Emtech. http://emtech.steadynet.com/index.shtml
- Emtech is currently out of stock on their NW-series radios. Check back. In the meantime, they have the excellent ZM-2 QRP tuner kit.\
-JUMA. http://www.jumaradio.com/juma/ All prices are in EUROS €
- Series one kits. Three kits available. All DDS controlled, covering 80, and 40 meters. RX1 Receiver, 74.80€, TX1 Transmitter, 80.33€, and TRX1 Transceiver, 169.00€.\
- Series two kits. Two kits available. Both are high dynamic range, 10W output, SSB and CW transceiver kits, using quadrature sampling techniques for demodulation and modulation with low noise phasing. VFO is DDS controlled for a good frequency stability. TRX2 2-band model (80 and 40) 395.00€, and TRX2A 80 thru 10 model with general coverage receiver, 499.00€
- R1 Code Practice Receiver. High quality fixed frequency CW receivers designed for simple operation. Standard models are available for W1AW frequencies in the 80, 40 and 20 meter bands. $29.95 + S&H
-Small Wonder Labs. http://www.smallwonderlabs.com/
- Rock Mite CW Transceiver. The Rock-Mite is a crystal-controlled direct-conversion transceiver available for 80M, 40M, 30M or 20M. $29 + S&H some accessories available.
- The Retro 75. This is a nostalgic kit. A crystal controlled AM Transceiver with 2 watts carrier, 8 watts peak. $69 + S&H
-Wilderness Radio. http://www.fix.net/~jparker/wild.html
- Simple Superhet Receiver (SST). The SST is an optimized, superhet rig with an extremely low parts count . This may be the easiest to build superhet ever, and it comes with a miniature custom enclosure. 2 Watts output. $90 + S&H
- Nor Cal 40a. The revision B NorCal 40A is a third-generation 40-meter QRP transceiver kit, designed by Wayne Burdick, N6KR. The rig covers any 40KHz portion of the CW band, with a very stable VFO operating in the 2MHz range. The receiver is a superhet with crystal filter, AGC, and RIT. 3 Watts output. $145 + S&H
- Sierra. The Sierra is the only compact, low-current, multiband transceiver kit available. Designed by N6KR and extensively field-tested by the NorCal QRP Club, the Sierra has been completely upgraded for Wilderness Radio–including a painted and silk-screened enclosure and improved performance on both transmit and receive. Uses plug-in band modules for 80, 40, 30, 20, 17 and 15 meters. 1.5 to 3 watts depending on band. LCD display. Starts at $245 + S&H with 1 band module.
-Four State QRP Group. http://www.wa0itp.com/4sqrpkitindex.html
- Ham Can Transceiver. A crystal-controlled CW transceiver, delivering 1/2 to 1 watts. Easy thru-hole kit. Crystal for 7122 included. $30 includes shipping.
- NS-40 Transmitter. Ideal first kit. There are only 14 electronic components, and NO TOROIDS or COILS of any kind to wind – NONE! All inductors are incorporated directly on the PC board as etched spirals. 5 watts at 13.6 volts. $30 includes shipping.
-Kanga US. http://www.kangaus.com/products_by_type.htm
- Several inexpensive kits for the radio hobbyist.
-Electronics USA. http://electronicsusa.com/productsham.html
- A nice collection of kits including keys, keyers, and clocks.
- Little Joe Transmitter Kit. A small kit with board and parts from the book QRP Classics. Available for 80, 40, 20, and 10/15. Does not include crystals. $19.95 + S&H
- Cubic Incher Transmitter Kit. A small kit available for 40 or 80 meters. Crystals not included. Currently on closeout for $6.50 + S&H
-DZ Kit. http://www.dzkit.com/
- Sienna Transceiver Kit. This is a high end, full-featured transceiver with many options. The Sienna can be a full-control stand-alone rig, or a computer-controlled-only rig. Available in 10 and 100 watt version. Kits start at $2098 + S&H for the computer-only 10 watt model.
- HT-7 7Meter AM Walkie Talkie. The HT-7 is a simple AM handie-talkie that operates on the 40M AM calling frequency. $149.99 + S&H
- OHR 100A single band CW transceiver kit. Offered in 80, 40, 30, 20, and 15 Meter versions. Each can be aligned to cover 70-80Khz. 5 Watt output. $149.95 + S&H
-QRPme. http://www.qrpme.com/ Several kits and accessories here. They also have an intriguing kit of the month club” delivering kits to you every month.
- Micro 80D. Small tunable 80 meter CW transceiver kit. $35 + S&H
- Lil Squall Transceiver. A version of the Pixie Transceiver. A tinkerers delight. It fits in a small tuna can. Includes a socket for the FINAL transistor for easy experimenting with output power. Likewise, the feedback caps in the oscillator circuit also have sockets making it easy to experiment with new bands. The crystal also has a socket for easily moving the operating frequency about a band. Comes will ALL the parts necessary to complete the transceiver and a 7122 crystal for operating the Lil’ Squall ][ in an area where other minimalist rigs hang out, AND the ‘officially unofficial’ TUNA NET frequency for tuna can gatherings. $35 + S&H
- Super Tuna II+. A version of the Sudden Transmitter from the GQRP Club. Transmitter section is comprised of an oscillator, buffer and final driver transistor. Produces 2 watts at 12.6 volts. Frequency dependent components are mounted on an easily changed band module. The basic kit comes with a band module for 40 meter operation. $40 + S&H
- Tuna Tin 2 30th Anniversary Isuue. A re-issue of the original TT2 transmitter. Parts are laid out on the board in the exact same way the schematic is drawn. Simple, and easy to build. Comes with crystal for 7.030. $25 + S&H
- EZ Build Two-Tinned-Tuna Transmitter. EZ build version with no toroids to wind. Several socketed parts for experimenting and comes with 2 crystals for 40 meters. $30 + S&H
- Sudden Storm Receiver Kit. Great companion to any of the tuna can transmitters. Comes with components for 40 meters but can be operated on 80, 30, and 20 using the upgrade kit. $35 + S&H
- Reggie II Transceiver Kit. A lesson in minimalist design. The Reggie uses the Limerick construction technique. Output is about 100mW. $40 + S&H
- MKARS80 SSB Transceiver. This kit is based on the same design that is used in the BITX20 from Hendricks, but modified for 80 meter use. Main changes from Ashhar’s original design are the inclusion of a frequency counter and a Huff and Puff frequency stabilizer. Covers from 3.5 to 3.8 Mhz with about 5 Watts output. This kit is a bargain! Ranging from a basic no-case kit for £55.00 shipped to the USA, to full kit with connectors, knobs, and an undrilled case for £68.50
- Hunter SDR Receiver / Panadapter. This looks like an interesting and economical SDR kit, that can also be controlled by an existing rig for use as a panadapter. £87.00 shipped to the USA
-Radi0shop (eBay store). http://stores.ebay.com/radi0shop This eBay store is selling a couple versions of the Pixie II transceiver. They currently have the 80 meter version in stock, and claim to also supply the 40 meter one. Looks like a very simple build. $39.00 free shipping.
–Zao.jp. http://zao.jp/radio/order/ Zao has one kit currently available. He is also the source for the pre-built Soft66 SDR radios (currently selling new version LC4) which is one of the lowest-priced pre-built SDR receivers on the market. Getting it running is a challenge I hear, but performs well for the money once you do.
- Soft66Lite. Small monoband SDR that can be built for different ranges depending on the bandpass components installed. Easily switchable by plugging in homemade bp modules setup on IC sockets. $18 shipped to USA
–Amateur Radio Kits.in. http://cqbitx.blogspot.com/
- BITX Kits. I won’t list the kits individually because the website is a bit confusing. They seem to have several different options from a basic kit with just the board and specialty components only for $18 to a deluxe complete kit with digital readout for $85
- AVALA SDR board only. There are a few sites supporting this SDR. Not sure if I’m ready to tackle something like this, but it does look interesting. Board only: $10
ATS-4 b due late September / early October
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″.
- Steven Weber KD1JV’s ATS-4 5 band trail friendly transceiver
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.
QRP at Bamarang
Last weekend I had a great time playing radio. Along with half a dozen other families and all our kids we went to spend the Easter weekend at the “mud brick mansion” at Bamarang on the Shoalhaven River, a few km west of Nowra on the south coast of New South Wales. Courtesy of the pod on my car I was able to take quite a few radio bits and pieces along.
We enjoyed perfect autumn weather while it rained back home in Sydney!
I even managed to build the neat little EFHW (End Fed Half Wave) Tuner designed by Stu, KI6J on a shady verandah. The kit had arrived a few days earlier and I made sure I had everything I needed to build it away from my attic/shack/workshop. In fact the weekend became a sort of trial for field day and a great way to identify the essentials. If there’s a lot of gear on hand an awful amount of time can be wasted deciding which bits to use and how.
I was inspired by reports about the EFHW tuner and the appeal of not having to worry about ground radials. What clinched it for me was a photo I saw on one of the (far too many) qrp email groups I try to follow showing a ham on a mountain side beneath his arching squid pole with the little tuner matching the hi-Z of the half-wave antenna to the 50 ohms expectations of the tiny transceiver which was probably an ATS3b.
So that was my mission for the weekend.
The tuner kit went together in a very short time. Before accepting my order Stu, KI6J sent me a powerpoint of the assembly instructions so I was sure I could handle the construction. The fiddliest bit was the tiny binocular ferrite core transformer for the bridge. Fortunately he provided enough wire in the kit for me to botch it the first time round and do it perfectly the second!
After a couple of leisurely hours mostly taken up with drilling holes in a tiny plastic box it was working on the test lash-up. The polyvaricon is delightfully sharp. You tune by dimming the LED – and then switch out the bridge to transmit.
The KI6J EFHW Tuner kit almost complete with the 5k ohms test load in place. The builder provides the enclosure and connectors. (Photo sourced from instructions)
I had a 10m (almost 33 feet) squid pole (aka Jackite or crappie pole) with a tiny pulley from a boating store attached to the top with cable ties. I used the guy ropes from my Buddipole setup to hold the pole up straight. It stayed up all weekend.
The half wavelength formula in feet is 477/freq in MHz, or just on 68 feet (20.7m) for the code end of 40m. The far end of this was held up – via a plastic button insulator – by a fishing line launched up into a tree using a half-filled plastic drink bottle. All too easy! The near end of the antenna simply terminates in a banana plug that connects to the little tuner. I also connected a short 5-6 foot counterpoise, which was essential.
I had a great time playing with the tuner and my new SDR-Cube pumping out a whole watt of RF, as well as the trusty little FT-817.
Now I have a clear idea of what’s required for an effective little kit of gear to take up a hill for relatively speedy SOTA style deployment. And maybe I’ll fill the water bottle for those trips.
If you’re interested in getting hold of one of these nifty little EFHW Tuner kits you should contact Stu KI6J at [email protected]. US$27 included shipping across the Pacific Ocean! Fast and very fair!
My blissed-out second operator in the field at Bamarang, near Nowra NSW. He helped me retain my QRP calm.
During a trip into the township to replenish supplies I found a fishing tackle shop with an Easter sale on, and bought a couple of handy Plano tackle boxes and some inexpensive 10m lengths of nylon coated stainless steel ‘leader line’ wire which I’m sure can be used for a handy weatherproof dipole. As long I don’t have to solder the stuff.
