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Knights:

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

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

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

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...


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 ().
---
Yannick DEVOS - XV4Y

QRPLabs Group,

I have written a short article and published it on my website:

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 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

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

Thanks guys! That answers my question. I should have figured that out on my own.

I ordered new NP0 capacitors from Digi-Key and when they arrive I'll be able to finish up. In the meantime I'll be winding the inductors and further populating the board. Actual on-air testing may take a while since I live in an apartment for now. A balcony antenna may be a possibilty.

Regards,

Richard
AA4RH

Richard,

--
RIP Dennis Richie, I'm sure you will still be cutting code somewhere out there in the universe. You gave the world "C" and taught me a lot.

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,
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


Kevin
ZL1UJG

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



73

F6BCU

Hi all
In this argo-wide you see in the upper right border "your call here". If you have a hex-editor you can look for the hex equivalent of these words and place your call and locator there
NB the resulting number off signs in the file must be the same as before. If necessary you put spaces in it. I used XVI32 (www.chmaas.handshake.de )
'73 Johan- PA0TAB


----- Oorspronkelijk bericht -----
Van: Colin
Aan: QRPLabs@...
Verzonden: maandag 10 oktober 2011 18:36
Onderwerp: [QRPLabs] Re: New file uploaded to QRPLabs





Hi All,

In my rush uploading the "wide argo" version I forgot to put a Read-me in the archive. You need the *original* Argo installed for its DLL files. I have now updated the zip file which includes the Read-me.

Just unzip argo1.zip in your Argo Folder and create a new shortcut to the new argo1.exe file on your Desktop.
Notice it is called argo1, this is so the original does not get over written.

I have also included the URL to the Argo site in the Read-me

73 Colin - G6AVK

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:


To learn more about file sharing for your group, please visit:

Regards,

g6avk <colinjt@...>

Hi All,

In my rush uploading the "wide argo" version I forgot to put a Read-me in the archive. You need the *original* Argo installed for its DLL files. I have now updated the zip file which includes the Read-me.

Just unzip argo1.zip in your Argo Folder and create a new shortcut to the new argo1.exe file on your Desktop.
Notice it is called argo1, this is so the original does not get over written.

I have also included the URL to the Argo site in the Read-me

73 Colin - G6AVK

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:


To learn more about file sharing for your group, please visit:

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

You can access this file at the URL:


To learn more about file sharing for your group, please visit:

Regards,

g6avk <colinjt@...>

Hi George,



73
Aldo

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