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Stephen, Have you ever used "mini ringcore calculator" from DL5SWB? Works fine '73 Johan- PA0TAB http://pa0tab.nl/grabber.html ----- Oorspronkelijk bericht ----- Van: Stephen Aan: QRPLabs@... Verzonden: zaterdag 27 augustus 2011 12:19 Onderwerp: [QRPLabs] Toroids - a note of caution. If you can it is always worth measuring the inductance of a toroid core rather than relying on the various charts and on line calculators that tell you how many turns equate to an particular inductance. I was making an LPF for 20 meters the other day and discovered that the chart I was using told me I needed 17 turns for a particular inductance, however when I measured the inductance I only needed 15 turns. With the extra turns the LPF would not have performed as required.... 73s Steve G0XAR

Morning folks Decided to get my head around setting up a grabber on 30M Early days but getting there. Homebrew simple DC receiver into an 80 meter dipole converted to a doublet tuned to 30 by a homebrew Zmatch. Using Argo and Argo upload but does anybody know where to get the version of Argo which shows a larger frequency range? Had it once but can't find it now... Anyhoo, a basic start and it should be on most of today for testing... http://www.qsl.net/g4jvf/ Regards Philip G4JVF

I am unable to download the argo program from sdrham.com. Get a 404 message when I connect. Does anyone know of an alternative? Thanks Geo, W4GFA

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the QRPLabs group. File : /wide_argo/argo1.zip Uploaded by : g6avk <colinjt@...> Description : A wide Bandwidth (~200HZ) version of Argo You can access this file at the URL: http://groups.yahoo.com/group/QRPLabs/files/wide_argo/argo1.zip To learn more about file sharing for your group, please visit: http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards, g6avk <colinjt@...>

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the QRPLabs group. File : /Original Argo/argopak1_134.exe.zip Uploaded by : g6avk <colinjt@...> Description : The original Argo V1 build 134 package You can access this file at the URL: http://groups.yahoo.com/group/QRPLabs/files/Original%20Argo/argopak1_134.exe.zip To learn more about file sharing for your group, please visit: http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards, g6avk <colinjt@...>

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the QRPLabs group. File : /wide_argo/argo1.zip Uploaded by : g6avk <colinjt@...> Description : A wide Bandwidth (~200HZ) version of Argo + Readme You can access this file at the URL: http://groups.yahoo.com/group/QRPLabs/files/wide_argo/argo1.zip To learn more about file sharing for your group, please visit: http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards, g6avk <colinjt@...>

god day to all free download the radio amateur handbook by F6BCU 580 MO 2100 pages 225 articles schématic, QRP, antenna, color photo 10GHz to 160m http://communaute.onlineradio.fr/files/file/162-handbook-de-la-ligne-bleue/ 73 F6BCU

Hi, Some of you may have noticed I placed a file in the files section about the ceramic capacitors used in the Hans Summers Tx. Note that NP0/ C0G capacitors may also have a black top as their marking The info is also available at http://knightsqrss.blogspot.com/ Kevin ZL1UJG

After a year and a half I am finally starting construction of my 30 meter QRSS beacon. Right away I came up with a question. I installed the Atmel microcontroller and C12, attached a set of headphones, and powered the unit up. I hear my call sign one time and then a very slow series of tones separated by long periods of silence. My call sign is never repeated. If I disconnect and reconnect power, the same sequence starts all over again. This is not what I expected. I thought that during the test my call sign would be repeated continuously, which is what I thought QRSS is all about. My question: When the circuit is complete and the speed is set to 3 second dots, or slower, does the microcontroller have enough "smarts" to recognize that it should send my call sign repeatedly? I don't want to continue with the construction until I'm sure that the microcontroller is working properly. Thanks for any replies, Richard AA4RH

Hi, Does anyone know what the crystal specification ( and manufacturer) is for the higher frequency crystals. (such as 14 and 28 MHz) I am interested in the info for research purposes only. Thanks Kevin ZL1UJG

Hi QRPlabs, I put my station on the air today as part of the New Years blitz planned by Dave Hassall WA5DJJ. We have 15 participants in the Las Cruces, New Mexico group. We have an active builders group that I facilitate. I'm glad to finally have my station on the air and have been very solid into K4HBK grabber all afternoon and into the evening. I'm running a Hans Summers kit with modified filter values, otherwise unmodified except for using a PIC 12F629 with software provided by N0QBH and programmed by WA5DJJ. The antenna is an inverted-V at about 30feet on my tower with about 50feet of transmission line. I'm currently at approximately 10139955Hz and running approximately 220mW (5V supply only). I look forward to continued experimentation in the new year. Cash Olsen KD5SSJ ARRL Technical Specialist

QRPLabs Group, I have written a short article and published it on my website: www.kd5ssj.com also this from the ARRL Rocky Mountain Division newsletter published today: It’s a new year, we’d like to add a new feature of our monthly Division-wide communication: to spotlight hams who are participating in or promoting the seemingly endless fun and magic of ham radio.? Does this describe you or your group?? If so, please touch base (n5zgt@...) and we’ll feature someone or some group in a future Division-wide email for all to enjoy. ? Kicking off this feature, let's glance at a group in southern New Mexico and other parts of the country, spearheaded by David Hassall WA5DJJ, that’s involved in QRSS.? QRSS is extremely slow speed CW, to the tune of single dots lasting tens of seconds, sent and received with the aid of free software to communicate great distances using very low power.? Why such slow speed?? Think of a dark scene that you’d like to take a photograph of (without a flash).? Setting the camera for a short exposure period would result in a dark or black photo.? However, setting the camera for a long exposure period allows seemingly indiscernible light in the scene to be added, or integrated, and captured to produce a brilliant photo despite the dark scene.? Similarly with QRSS, the lengthy CW dits and dahs allow the receiving station to pull the low power signal out of the noise for a successful contact. ? What does “low power” mean in the realm of QRSS?? David has communicated to New Zealand on 30 meters with less than 250 milliwatts (mW). Pushing the envelope further, he recently communicated from Las Cruces, New Mexico to Pensacola, Florida with a mere 9 microwatts (uW).? That’s how much power it takes to run a digital wristwatch or, put another way, more than 11 MILLION times less power output than a typical 100 watt HF transceiver. ? Over New Year's weekend a group of 15 hams, led by Dave, each put a very low power (QRPp) 30-meter transmitter on the air beginning at 0000UTC December 31, 2011 and kept them operational for 48 hours to see how many signals each could receive.? A participating ham in New Zealand successfully received the following low power stations: KE5OFK*, WB5UEW*, P29ZL*, KC7VHS*, W1AW, ZL1EE, K5DLA*, NM7J*, WE4DX, N5BL*, G0PKT, WB5FKC*, KD5SSJ*, KC5VR*, N5CWW*, K7TP, WA5DJJ* (* indicates associated to the Las Cruces group). ? The typical QRSS transmitter is simply composed of three transistors, a crystal controlled oscillator, buffer, power amplifier and microprocessor programmed with the station’s call sign. They are powered with a 5 or 12 volt source and measure approximately 2 x 2.5 inches. The typical antenna is a resonant dipole. ? If QRSS sounds like a new area of ham radio you’d like to experiment with, please contact Dave Hassall WA5DJJ (dhassall@...) or Cash Olsen KD5SSJ (qrss.kd5ssj@...) for more information.

Hi friends, Happy new year to all. Here a short article on how I reprogrammed the ATTiny13 micro-controler inside Hans and Steve MEPT kit. Nothing revolutionary but could be of some interest for a few people like me. The article is in french but automatic translation should make you understand what I am talking about... http://xv4y.radioclub.asia/2012/01/05/programmer-un-micro-controleur-atmel-attiny-avec-un-arduino/ My MEPT will be back on the air tonight around 10.140.040 broadcasting XV4Y calsign. I am doing some verifications right now and checking frequency stability... 73 es GDX, Yan. PS: If automatic translation does not show up, please go to the main page (http://xv4y.radioclub.asia/). --- Yannick DEVOS - XV4Y http://xv4y.radioclub.asia/ http://varc.radioclub.asia/ http://www.qslwatch.com/

Stan, I put my QRPlabs kit in a sandwich of 1' styrofoam. I first cut three pieces 4" x 5" Then I cut a 2" x 2.5" rectangular hole for one sheet. I used aluminum duct tape on the edges and turned the radiant barrier film to the outside. I made a little grove for the antenna lead to exit and then one of the other pieces on each side and taped the thing together. See picture at www.kd5ssj.com My suggestion is don't make it to complicated. A secondary value of the method that I used is that it is very light tight. Incident light on the LED will change your frequency, perhaps as much as small temperature changes. I power the transmitter from only 5 volts and have had excellent frequency stability. It very quickly came to temperature of equilibrium. My power out is 220mA and I'm operating at 10139955Hz, from DM62pj New Mexico. Cash Olsen KD5SSJ ARRL Technical Specialist

Clayton, I'm just getting on the air and joining the group but I have a great interest in your suggestions. I would encourage you to right the article for CC (I've been a subscriber for a decade or more) and if you'd like to have some read it before submission I'd be interested. Watch for my signal, I have been into ZK / ZL territory every day since commissioning the transmitter on New Years Eve. I do not have a receiving station at the present time but there is likely a reciprocal path at the same time from your QTH. There are so many local transmitters in my area (15 QRSS 30m) that I'm told that there is a lot of QRM and a local grabber may be a big challenge. Charlie Welch, N5CWW, and I had a conversation very much along these lines just the other night. Cash Olsen KD5SSJ ARRL Technical Specialist

Knights: If anyone would be interested in the c source code for a simple keyer written for the TI Launch Pad, I'd be willing to share it with you. If you needed just the hex code with your call sign programmed in I could also provide that. Right now it is very basic. The red LED blinks out what ever you put in the string variable. I currently have it testing with 3 second dit but that is simply a constant change, the rest of the timing follows according to Morse code convention. Also for testing I have it set to repeat every 5 minutes, but that too can be changed with a single constant. I have some future plans for added features and modes. The reason I'm playing with the TI Launch Pad is that it is just so darn cheap, USD $4.30 that's not just the chip but the entire development system on a board almost exactly the same size as the QRP Labs QRSS Transmitter. Just three wire interface to the transmitter. I'll publish details at www.kd5ssj.com later today. Cash KD5SSJ

Just wanted to introduce myself to the group. I just built a small QRSS transmitter, which I'm trying out for the first time right now on 30 meters (just about spot on 10140.5). I hope I pop up on some grabbers somewhere! I may leave it on overnight as well. I look forward to learning from everyone here. Thanks and 73! Steve KC2SIZ

GD All, I have finished my kit, I know it is working but at what freq. is unknown, I do know that I can find out by using another receiver. I will do this as soon as I can make a sched with a close elmer to me. Is there a to tweak the power out without a scope? I was also wondering if I could use a 7.2v 1100mah Nimh rechargeable battery from an old RC model? Last question in this post is; has any one developed or know of a switch that I can get so that I can change the CW speed without solder/de-solder the jumper. I plan on using my beacon as a stationary balloon, where I plan to vary the height to see how many from this group and various amateurs can report my beacon. Harold/KD8DVY

Over the course of the last couple of days, I've had my transmitter on the air for a combined total of about 18 hours. Yet I haven't been "grabbed" yet, so far as I know. Is this typical? I know a big part of this is patience and I want to manage my expectations. Steve

GD all, My last post was about power and alignment well I have that covered now it's time to set the keyer speed. I was able to find a 11 position rotatory switch that I will like to experiment with. I am kinda confused about which pins to connect for what speeds. I do have the manual however it is not very clear for one of my knowledge. Is there a better chart of pin configuration that I can view? Thank you, Harold/KD8DVY