Posts Tagged ‘amateurradio.com’
It was an NPOTA weekend …..
April 18th, 2016 | 
Author: in more ways than one.
I worked about 5 or 6 new entities between Friday night and Saturday, so I am getting really close to my personal goal of working 100. The bands have been good the past couple of days, after totally stinking during the middle of the week, so that was a good thing.
I have lived relatively near Morristown National Historical Park my entire life. I think I've been there once before NPOTA. Yesterday, I decided to take Marianne and our dog, Harold up there for the afternoon, as dogs are welcome there. It was a beautiful Spring day, Marianne had an extremely rare Saturday off; and I wanted to do something with her. It seemed like a good opportunity to enjoy the gorgeous weather, walk the dog and get some good exercise in for ourselves. It's because of NPOTA that I discovered that dogs are welcome there. If I didn't see that while I was up there, activating the park, I wouldn't have known otherwise.
Much to our surprise, when we got there, we found out that a Revolutionary War re-enactment was taking place:
The highlight of the day was when one of the re-enactors came up to me and tapped me on the shoulder. He pointed to the American flag that is embroidered on the left sleeve of my jacket and he said to me, "Kind sir, a question, please. It appears that you have a United States flag on your coat; and yet there are so many stars? Certainly more than 13!"
I answered, "It's a long and sometimes bloody story, and I don't think we have time to go through it all, but I would like to thank you and your fellow soldiers for giving birth to the finest Nation on Earth."
He chuckled, and I chuckled at our impromptu time travelling scenario. In the end, it was great NPOTA day, even though this one didn't involve Amateur Radio. So hats off to the ARRL for reminding me about some of the really cool places that there are to visit around my QTH.
In the evening, I decided that I would go out early Sunday morning to activate Sandy Hook, which is part of the Gateway National Recreational Area - RC08.
I used the Jackite pole and my homebrew mast holder and the PAR END FEDZ 40/20/10. In a little over an hour, I made over 40 contacts on 40 and 20 Meters. Bext DX was Alberta, Saskatchewan and California. Not bad for 5 Watts, and if at all possible, the PAR will be my preferred antenna for future activations.
I would have stayed longer, but I had somewhere to go with my daughter Cara, so I made due with the time I had. It was a bit brisk while I was there, but it was sunny and clear. If you click on the bottom photo, you just might be able to make out the New York City skyline in the distance, on the horizon.
Sandy Hook was my third activation, and I hope to do at least two more in New Jersey - the Pinelands and the Appalachain Trail in the Northwest part of the state. When we go up to Lake George this Summer, I also hope to spend one day at Saratoga and activate HP42 while I'm in the neighborhood.
72 de Larry W2LJ
QRP - When you care to send the very least!
I worked about 5 or 6 new entities between Friday night and Saturday, so I am getting really close to my personal goal of working 100. The bands have been good the past couple of days, after totally stinking during the middle of the week, so that was a good thing.
I have lived relatively near Morristown National Historical Park my entire life. I think I've been there once before NPOTA. Yesterday, I decided to take Marianne and our dog, Harold up there for the afternoon, as dogs are welcome there. It was a beautiful Spring day, Marianne had an extremely rare Saturday off; and I wanted to do something with her. It seemed like a good opportunity to enjoy the gorgeous weather, walk the dog and get some good exercise in for ourselves. It's because of NPOTA that I discovered that dogs are welcome there. If I didn't see that while I was up there, activating the park, I wouldn't have known otherwise.
Much to our surprise, when we got there, we found out that a Revolutionary War re-enactment was taking place:
The highlight of the day was when one of the re-enactors came up to me and tapped me on the shoulder. He pointed to the American flag that is embroidered on the left sleeve of my jacket and he said to me, "Kind sir, a question, please. It appears that you have a United States flag on your coat; and yet there are so many stars? Certainly more than 13!"
I answered, "It's a long and sometimes bloody story, and I don't think we have time to go through it all, but I would like to thank you and your fellow soldiers for giving birth to the finest Nation on Earth."
He chuckled, and I chuckled at our impromptu time travelling scenario. In the end, it was great NPOTA day, even though this one didn't involve Amateur Radio. So hats off to the ARRL for reminding me about some of the really cool places that there are to visit around my QTH.
In the evening, I decided that I would go out early Sunday morning to activate Sandy Hook, which is part of the Gateway National Recreational Area - RC08.
I used the Jackite pole and my homebrew mast holder and the PAR END FEDZ 40/20/10. In a little over an hour, I made over 40 contacts on 40 and 20 Meters. Bext DX was Alberta, Saskatchewan and California. Not bad for 5 Watts, and if at all possible, the PAR will be my preferred antenna for future activations.
I would have stayed longer, but I had somewhere to go with my daughter Cara, so I made due with the time I had. It was a bit brisk while I was there, but it was sunny and clear. If you click on the bottom photo, you just might be able to make out the New York City skyline in the distance, on the horizon.
Sandy Hook was my third activation, and I hope to do at least two more in New Jersey - the Pinelands and the Appalachain Trail in the Northwest part of the state. When we go up to Lake George this Summer, I also hope to spend one day at Saratoga and activate HP42 while I'm in the neighborhood.
72 de Larry W2LJ
QRP - When you care to send the very least!
It was an NPOTA weekend …..
in more ways than one.
I worked about 5 or 6 new entities between Friday night and Saturday, so I am getting really close to my personal goal of working 100. The bands have been good the past couple of days, after totally stinking during the middle of the week, so that was a good thing.
I have lived relatively near Morristown National Historical Park my entire life. I think I've been there once before NPOTA. Yesterday, I decided to take Marianne and our dog, Harold up there for the afternoon, as dogs are welcome there. It was a beautiful Spring day, Marianne had an extremely rare Saturday off; and I wanted to do something with her. It seemed like a good opportunity to enjoy the gorgeous weather, walk the dog and get some good exercise in for ourselves. It's because of NPOTA that I discovered that dogs are welcome there. If I didn't see that while I was up there, activating the park, I wouldn't have known otherwise.
Much to our surprise, when we got there, we found out that a Revolutionary War re-enactment was taking place:
The highlight of the day was when one of the re-enactors came up to me and tapped me on the shoulder. He pointed to the American flag that is embroidered on the left sleeve of my jacket and he said to me, "Kind sir, a question, please. It appears that you have a United States flag on your coat; and yet there are so many stars? Certainly more than 13!"
I answered, "It's a long and sometimes bloody story, and I don't think we have time to go through it all, but I would like to thank you and your fellow soldiers for giving birth to the finest Nation on Earth."
He chuckled, and I chuckled at our impromptu time travelling scenario. In the end, it was great NPOTA day, even though this one didn't involve Amateur Radio. So hats off to the ARRL for reminding me about some of the really cool places that there are to visit around my QTH.
In the evening, I decided that I would go out early Sunday morning to activate Sandy Hook, which is part of the Gateway National Recreational Area - RC08.
I used the Jackite pole and my homebrew mast holder and the PAR END FEDZ 40/20/10. In a little over an hour, I made over 40 contacts on 40 and 20 Meters. Bext DX was Alberta, Saskatchewan and California. Not bad for 5 Watts, and if at all possible, the PAR will be my preferred antenna for future activations.
I would have stayed longer, but I had somewhere to go with my daughter Cara, so I made due with the time I had. It was a bit brisk while I was there, but it was sunny and clear. If you click on the bottom photo, you just might be able to make out the New York City skyline in the distance, on the horizon.
Sandy Hook was my third activation, and I hope to do at least two more in New Jersey - the Pinelands and the Appalachain Trail in the Northwest part of the state. When we go up to Lake George this Summer, I also hope to spend one day at Saratoga and activate HP42 while I'm in the neighborhood.
72 de Larry W2LJ
QRP - When you care to send the very least!
I worked about 5 or 6 new entities between Friday night and Saturday, so I am getting really close to my personal goal of working 100. The bands have been good the past couple of days, after totally stinking during the middle of the week, so that was a good thing.
I have lived relatively near Morristown National Historical Park my entire life. I think I've been there once before NPOTA. Yesterday, I decided to take Marianne and our dog, Harold up there for the afternoon, as dogs are welcome there. It was a beautiful Spring day, Marianne had an extremely rare Saturday off; and I wanted to do something with her. It seemed like a good opportunity to enjoy the gorgeous weather, walk the dog and get some good exercise in for ourselves. It's because of NPOTA that I discovered that dogs are welcome there. If I didn't see that while I was up there, activating the park, I wouldn't have known otherwise.
Much to our surprise, when we got there, we found out that a Revolutionary War re-enactment was taking place:
The highlight of the day was when one of the re-enactors came up to me and tapped me on the shoulder. He pointed to the American flag that is embroidered on the left sleeve of my jacket and he said to me, "Kind sir, a question, please. It appears that you have a United States flag on your coat; and yet there are so many stars? Certainly more than 13!"
I answered, "It's a long and sometimes bloody story, and I don't think we have time to go through it all, but I would like to thank you and your fellow soldiers for giving birth to the finest Nation on Earth."
He chuckled, and I chuckled at our impromptu time travelling scenario. In the end, it was great NPOTA day, even though this one didn't involve Amateur Radio. So hats off to the ARRL for reminding me about some of the really cool places that there are to visit around my QTH.
In the evening, I decided that I would go out early Sunday morning to activate Sandy Hook, which is part of the Gateway National Recreational Area - RC08.
I used the Jackite pole and my homebrew mast holder and the PAR END FEDZ 40/20/10. In a little over an hour, I made over 40 contacts on 40 and 20 Meters. Bext DX was Alberta, Saskatchewan and California. Not bad for 5 Watts, and if at all possible, the PAR will be my preferred antenna for future activations.
I would have stayed longer, but I had somewhere to go with my daughter Cara, so I made due with the time I had. It was a bit brisk while I was there, but it was sunny and clear. If you click on the bottom photo, you just might be able to make out the New York City skyline in the distance, on the horizon.
Sandy Hook was my third activation, and I hope to do at least two more in New Jersey - the Pinelands and the Appalachain Trail in the Northwest part of the state. When we go up to Lake George this Summer, I also hope to spend one day at Saratoga and activate HP42 while I'm in the neighborhood.
72 de Larry W2LJ
QRP - When you care to send the very least!
Bugging Out
Vibroplex Bug QSO
Sometimes I'm in a mood to use my bug. I'm still a relatively new CW operator and using my Vibroplex Original Bug is both novel to me and a challenge compared to my Kent Straight Key or using paddles.
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| The key lineup with the Bug in the center |
I purchased my bug used on a well known auction site for about $65. It dates to sometime in the mid 1970s but it doesn't differ much from bugs made in the past 75 years. I have added some weight to slow it down to around 19 wpm DITs by taping a heavy spacer onto the factory pendulum weight as well as adding a heavy metal spacer to the end of the pendulum. The weight on the end of the pendulum is held on by a simple plastic drywall screw anchor. I can pull the weight off the back quickly if I want to let it go up to about 25wpm DITs. Without the extra weights this bug sends at around 27wpm at it's slowest speed and up to... well I don't know how fast because I can't control it at the fastest speed yet and I certainly can't copy others at that speed so I usually keep it below 20wpm for now.
If you haven't used a bug I encourage you to give it a try. It's a challenging key to get the hang of but the effort to learn it is fun and rewarding. I especially enjoy the tactile feedback from that swinging pendulum and the the click-clacking of the pendulum against the hanging damper.
I was using my Ten-Tec Eagle (model 599) purchased used from a local ham. The Eagle is a super little QRO radio although in this QSO my output is 5w. If you have sharp eyes you may see that the power level is set to 7w but that is actually 5w output according to my external meter. The 100 number under the CW symbol is the bandwidth that I was using. I generally keep the bandwidth at 500 Hz but there was a station operating above us that I wanted to mask.
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| Ten-Tec Eagle 599 |
The Eagle is a great CW rig. This model has 3 front end crystal filters 2400Hz, 600Hz and 300Hz giving it nice selectivity for any mode.
I was working Ed, KG4W in VA who is an SKCC member. If you want to work other manual key stations 3550 kHz is a calling frequency for the SKCC. Ed told me during the QSO he was using a VIZ vertical bug which is a unique and interesting bug design.
He reported my signal as 599 and he was 599 as well. I was running 5w output power to my 80m OCF Dipole. He was using an Yaesu at 100w to a fan dipole. 5w was sufficient for this QSO but if he had reported me as 559 or weaker I would have raised my power to 20w to make copy for him easier. I enjoy using QRP but when I rag chew I don't want to make it difficult for QRO stations to copy me if I can help it so having the Eagle allows me to raise my power if necessary for the communication.
The QSO
So here's the qso between two bug operators. I hope you enjoy it...
That's all for now
So lower your power and raise your expectations
72/73
Richard, AA4OO
Never heard Heard
I saw on Facebook this morning, that many were thanking the VK0EK expedition for the ATNO and were thanking them, in general, for a wonderful DXpedition. I would suspect they have gone QRT.
And I would guess I'm in the minority as I'm not in any of their logs. In fact, I never even heard them decently well enough to work them. There were a couple of times that I could tell they were on a given frequency, but they never loud enough that I would be able to hear my own call come back to me, on the off-chance that they would have heard me. It didn't seem right to just add to the QRM.
Am I disappointed? You're darn tootin' I am! Working VK0EK would have been an ATNO for me and I sure as heck would love to have them in my DXCC tally. But I'm not depressed about it.
It all goes back to that post a few weeks ago about balance. Yes, I do not have Heard Island as an entity worked. However, the sun is still shining, the birds are still chirping, our solar system is still plowing its way throughout the galaxy. I still have to go to work tomorrow and earn a living.
And while I didn't work them, and life goes on, I still applaud their effort. It's not easy to go to a remote island near Antarctica, and brave the elements and hardships to provide the rest of us Amateur Radio ops with a bunch of excitement and fun.
Thank you Team VK0EK - even though I'm not in your log - thank you for a job very well done, indeed!
72 de Larry W2LJ
QRP - When you care to send the very least!
And I would guess I'm in the minority as I'm not in any of their logs. In fact, I never even heard them decently well enough to work them. There were a couple of times that I could tell they were on a given frequency, but they never loud enough that I would be able to hear my own call come back to me, on the off-chance that they would have heard me. It didn't seem right to just add to the QRM.
Am I disappointed? You're darn tootin' I am! Working VK0EK would have been an ATNO for me and I sure as heck would love to have them in my DXCC tally. But I'm not depressed about it.
It all goes back to that post a few weeks ago about balance. Yes, I do not have Heard Island as an entity worked. However, the sun is still shining, the birds are still chirping, our solar system is still plowing its way throughout the galaxy. I still have to go to work tomorrow and earn a living.
And while I didn't work them, and life goes on, I still applaud their effort. It's not easy to go to a remote island near Antarctica, and brave the elements and hardships to provide the rest of us Amateur Radio ops with a bunch of excitement and fun.
Thank you Team VK0EK - even though I'm not in your log - thank you for a job very well done, indeed!
72 de Larry W2LJ
QRP - When you care to send the very least!
Never heard Heard
I saw on Facebook this morning, that many were thanking the VK0EK expedition for the ATNO and were thanking them, in general, for a wonderful DXpedition. I would suspect they have gone QRT.
And I would guess I'm in the minority as I'm not in any of their logs. In fact, I never even heard them decently well enough to work them. There were a couple of times that I could tell they were on a given frequency, but they never loud enough that I would be able to hear my own call come back to me, on the off-chance that they would have heard me. It didn't seem right to just add to the QRM.
Am I disappointed? You're darn tootin' I am! Working VK0EK would have been an ATNO for me and I sure as heck would love to have them in my DXCC tally. But I'm not depressed about it.
It all goes back to that post a few weeks ago about balance. Yes, I do not have Heard Island as an entity worked. However, the sun is still shining, the birds are still chirping, our solar system is still plowing its way throughout the galaxy. I still have to go to work tomorrow and earn a living.
And while I didn't work them, and life goes on, I still applaud their effort. It's not easy to go to a remote island near Antarctica, and brave the elements and hardships to provide the rest of us Amateur Radio ops with a bunch of excitement and fun.
Thank you Team VK0EK - even though I'm not in your log - thank you for a job very well done, indeed!
72 de Larry W2LJ
QRP - When you care to send the very least!
And I would guess I'm in the minority as I'm not in any of their logs. In fact, I never even heard them decently well enough to work them. There were a couple of times that I could tell they were on a given frequency, but they never loud enough that I would be able to hear my own call come back to me, on the off-chance that they would have heard me. It didn't seem right to just add to the QRM.
Am I disappointed? You're darn tootin' I am! Working VK0EK would have been an ATNO for me and I sure as heck would love to have them in my DXCC tally. But I'm not depressed about it.
It all goes back to that post a few weeks ago about balance. Yes, I do not have Heard Island as an entity worked. However, the sun is still shining, the birds are still chirping, our solar system is still plowing its way throughout the galaxy. I still have to go to work tomorrow and earn a living.
And while I didn't work them, and life goes on, I still applaud their effort. It's not easy to go to a remote island near Antarctica, and brave the elements and hardships to provide the rest of us Amateur Radio ops with a bunch of excitement and fun.
Thank you Team VK0EK - even though I'm not in your log - thank you for a job very well done, indeed!
72 de Larry W2LJ
QRP - When you care to send the very least!
Get your news the old fashioned way
Morse News
I'm always looking for ways to improve my CW copy skills. When I'm away from the radio and have some spare time I use a program called Morse News.
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| Morse News interface displaying a "Top 100 words" feed scrolling at the bottom |
It's an application that pulls RSS feeds and translates them to Morse. It has useful configuration options and even allows different "sounders" to be used.
For instance: you can listen to Morse the way railroad and Civil War telegraphers heard it via the clacking Telegraph sounder, or the early 20th century spark gap transmitters.
For instance: you can listen to Morse the way railroad and Civil War telegraphers heard it via the clacking Telegraph sounder, or the early 20th century spark gap transmitters.
The application is free but only runs on Windows computers. I'd love to see something like this for my phone.
Here's the link: http://sourceforge.net/projects/morse-rss-news/files/Morse%20Code%20Tools%203.2/MorseTools32Setup.exe/download
As with all software downloads from an untrusted source use your own best judgement whether to install this software and protect yourself from malware. I haven't detected any malware from my install but that doesn't mean it's not there.
Here's the link: http://sourceforge.net/projects/morse-rss-news/files/Morse%20Code%20Tools%203.2/MorseTools32Setup.exe/download
That's all for now
So lower your power and raise your expectations
72/73
Richard, AA4OO
It’s ALIVE !
The 1Watter 40m #551 -- Lives
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| The 1Watter 40m on it's inaugural QSO |
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| Inside the enclosure |
The 1Watter is a kit from kits and parts dot com
The Universal 1Watter (also called the 1H2O) is a full featured little superhet radio transceiver that you can build for about $50. It doesn't come with an enclosure, a tuning pot, speed pot or an on/off switch so that will cost extra unless you already have some in the junk bin.
Some of the features include;
- 1 mighty watt of output
- Good selectivity from the 3 crystal filters
- A VCXO tuned frequency range for the 40m band from approximately 7,020 kHz through 7,039 kHz
- A built-in full functioned keyer with provision for adding a speed pot and messages
- Included command button accesses the functions of the electronic keyer
- Natural sounding sidetone (nicer than my Ten-Tec Century/21)
The Build
The kit is delivered in a box and inside are a couple of brown paper bags stapled together. Inside one of the bags are a couple of plastic bags with the components. The other bag contained the header kit. The ferrite toroid mix types are separated in different unmarked plastic bags so don't mix them up (the instructions tell you which bag has each mix). If anything is missing the kit supplier (Diz, W8DIZ) is very responsive.
The kit includes both SMT caps and through hole caps. I tried to solder one of the SMTs but I didn't have the right kind of tweezers to hold it in position for soldering so I used the through hole caps.
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| SMT and through hole caps are supplied |
This is the 3rd revision of the Universal 1Watter board and I was the first to build the 40m version.
While the schematic was correct, some of the instructions weren't sorted out properly for the 40m kit. I related issues as I found them to the designer and he promptly updated the online documentation.
I soldered the components and wound toroids as I had time over a few evenings and the initial voltage tests went well.
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| using through hole capacitors rather than the SMTs |
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| some of the bits and bobs |
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| build is progressing |
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| close up |
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| XTAL filters give it good selectivity |
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| Everything except the final transistor |
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| AGC circuit |
Debugging
When the build was completed I connected the rig to an antenna and heard nothing.
The keying circuit and transmitter worked fine and I verified those functions but the receiver was deaf as a stump.
Thus began a number of days of investigation. Diz (the creator of the board) guided me through a number of debugging steps.
The first recommendation was to examine and rewind the binocular toroid balun that transformed the impedance from the xtal filters to the input of the U5 oscillator. He believed that I may had wound it incorrectly. I desoldered it and rewound it but that did not resolve the issue.
He then guided me through determining if one of the filter crystals or filter capacitors was bad. I desoldered a few components as a tests but that did not resolve the issue.
There are 3 identical mixer chips on the board. I swapped them around as there was a suggestion that there were some faulty chips in one of Diz's shipments.
I then took the board to my Elmer Paul Stroud AA4XX. He had a signal generator, Oscilloscope and RF detector. He traced the RF and all looked well but we still were unable to obtain any signal through the U5 mixer. Lastly we tried disconnecting the AGC transistor to see if it was clamping it and that didn't resolve it either.
Diz asked me to return the radio to him so he could take a look. After a couple weeks he emailed me saying he thought the BFO xtal might have a problem. But he later discovered that the oscillator in U5 was not starting up. Apparently the circuit design had a low Q and needed more current to get the oscillator working. He modified the design, adding a 16k resistor to the bottom of the board on U5 to get the oscillator going. After that all was well and he shipped the board back to me.
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| The FIX for all those problems required an extra resistor connected across U5 |
Learning from problems
Being the first person to build a particular version of a kit brings its own set of challenges, especially when you're as new to kit building debugging RF problems as I am. However I'm actually glad the kit didn't work right at the initial build.The process of debugging the board, was a great learning process. I studied the schematics and learned, as best I could, the function of each circuit so that I could better understand how to test it. During the debugging process Diz instructed me that although RF signal generators and scopes are useful you can tell a lot by touching a RF component with an inductive metal object and listening for a buzz or hum from the BFO.
So all-in-all, even though the bug in the board was not due to a error on my part, I'm glad it occurred. I understand more about superhet radio design than I did before and more than if the kit had worked right off the bat.
On the air
After receiving the board back, I hooked up the frequency XCO potentiometer, paddle, command button, audio and output potentiometer and an external speaker. I then connected a 12v battery and heard the 1H2O keyer chip announce itself at power up in Morse "1 W".
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| Frequency control pot on the left |
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| Volume control, output jack, cmd pot and paddle input |
For this first on-air excursion I was using it at the default startup 15wpm keyer speed. You can default the speed higher with a different resistor value.
I have a resistor shrink wrapped and connected in-line to the blue-white wire coiling above the radio connecting to the speed pot terminal. In essence fixing the speed at 15wpm until I add the speed pot.
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| Ready to transmit |
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| On the air... I was using my paddle out of the photo to the right of the Bug |
First On Air QSO
I tuned around and found a strong station at the end of a QSO near 7030 kHz.
When he sent the final dit-dit I called and WD4AXJ answered my first call. He was in TN near Knoxville, and I received a 559. We chatted for about 10 minutes. Sorry about the blurry video. I thought I'd focused.
After I recorded this video I found an open frequency and sent out my call. Very shortly thereafter KD2FSH answered my call and reported me as 599!
Whoo - hoo. 599 for my little 1Watter 40m.
I was transmitting using my 40m attic antenna. So deed restricted HAMs take note. You can build a one-watt radio and make contacts using your attic antenna. Haha.
You'll hear in the video there is some weirdness going on with the audio derived AGC. It is clamping down sometimes and is worse when I don't have the volume turned up very loud. When I began calling it clamped after every semi-break-in but didn't do it much after that. I'll have to look into that.
The AGC clamping may be a side effect of the increased gain Diz added to the BFO oscillator. I'll ask the forum.
Other than the AGC issue I'm super pleased with the little board. I touched the heat sync a couple of times after transmitting my side of the qso and it was warm but not really hot. It seems as though as long as you have a reasonable match to the antenna the power transistor should be happy.
My next steps are to get it in an enclosure and get it out to the Excalibur antenna site to hook onto that nice 40m doublet we put up a couple weekends ago. I plan to use my efficient little BLT tuner for that purpose. I will do a further review of the feature set on the keyer and record some more qsos for a later review.
Summary
The band was fairly busy and the little 1Watter did a fine job with stations on nearby frequencies. You can hear some getting around the passband but it is not bad at all. I'll do some tests to further define it's selectivity but at first glance it is far better than my old Ten-Tec Century/21.
My calls were answered quickly and I received good signal reports. It didn't sound as though the transmitter was drifting at all during the QSO. That's one advantage of using VCXO in the design. The disadvantage of using a crystal controlled oscillator for the frequency control is limited tuning range. The transmitter only has about a 18 kHz tuning range around 7030 kHz and I don't find many of the SKCC folks around that frequency but it is the QRP watering hole for 40m.
It is possible to shift the frequency with some capacitance changes but I think I'll leave it as is for a time and see how many states I can work.
Just imagine. This little $50 single band kit has good selectivity, a nice built-in keyer with a natural sounding sidetone, and lest we forget... You get a MIGHTY 1 WATT of OUTPUT. What more could a QRP ham need.
That one-watt of output was sufficient for all the QSOs I attempted tonight.
So lower your power and raise your expectations
72/73
Richard, AA4OO
UPDATE: 04/01/2016
I am still having the AGC pumping issue and others on the list have reported similar issues but only on receive. It happens to me when I key unless I turn up the volume very high. I did get it installed in a case but I still need to wire up a real power connector rather than using alligator clips.
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| !Watter installed in a case |
UPDATE: 04/05/2016
After doing quite a bit of reading I learned that the LM386 op-amp used in the 1watter is rather notorious for audio oscillations. There are a number of suggested fixes. I went with a 4.7uf cap connecting Pin 7 on U6 (the LM386) to ground. That hasn't totally resolved the issue but it's much less pronounced now.
I have it in the case with all the proper plugs now (see below) so I'm happy. I've been making QSOs every day with it and it continues to amaze me and the stations that work me. It is stable as a rock with regard to frequency and the large knob with the single turn 10k pot seems to work well for tuning. I have enough control to vary the frequency slightly without having to turn it too much. The tuning range is only about 20kHz so just 3 frequency markers are plenty to let me know what frequency I'm near. The selectivity is just fantastic for such a simple little radio. Diz has created an inexpensive winner.
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| cap fix for LM386 oscillations |
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| 1Watter in enclosure with all the proper connectors for the case |
