BREAKING NEWS! Mack has rebooted and W4AX.com is back online. It is a huge blessing and thanks again to Mack and the host of others who serve all of us! YAHOOO>>> Grinches lose! W4AX.COM is online again! Belay my last!
A few years ago, we did not know the term, Software Defined Radio but now it has become one of many new technologies that we hams are learning to adapt to our needs. As an antenna restricted condo dweller, I’ve found it most helpful for being able to listen to the bands at various times through the day.
W4AX.com during IARU CW contest
Yesterday I learned my favorite site, W4AX.com is shut down due to abuse by non-hams and other constraints. A big thanks to Mack, W4AX and others who are the unsung heros that provide services like these and have allowed access to others over the years. The Reverse Beacon Network is another great service and we often forget the time and expense that our fellow hams have put into keeping them going. As a blogger with multiple sites, I understand the challenges and resources it takes all too well.
I’ll miss being able to check the bands 24 x 7 on my favorite site, but perhaps it will prompt me and others to set up our own SDR site and share it with others. I salute those who like Mack paved the way for new technology to provide access to so many hams. Sorry that the burden got too heavy to keep it going, but know your work was appreciated by many. I’ll be sure to let others who are working behind the scenes know that they are appreciated too.
Blessings gang of pioneers and Happy Holidays to you all!
72,
Kelly K4UPG
The weather was too nice to sit inside. In the low 70′s with a very slight breeze so after church and a short nap I headed out to try my hand at giving out points in the QRP ARCI Homebrew Sprint. My startup was delayed by curious folks in the lakeside park wondering what in the world I was doing and how I got that string and wire so high up in the nice tall pine trees!
Next to the Lake in the Sun
I checked 40m first with an inverted L end fed half wave and my trusty Stuner (KI6S Stu’s kit) and decided to change to 20m after not hearing much activity. 20m was decent and there were a few of the big gun qrp contest regulars shooting it out. N4BP, K4BAI, K0ZK and a few other were running stations while the little guys like me were mostly doing Search and Pounce. Hey it is fun even if you cannot run a frequency, right?
Sun went down about 1745 local and the mosquitos were quick to find the hole in my hat and attack. This time I remembered the repellant and after a few bites I took time to spray my hat and hair and the backs of my hands. The temperature dropped fast and my hands got a bit stiff pounding out the morse code on my J-47 straight key. 50 degrees is cold for a Florida evening. The darkness also brought out the raccoon family and it was fun to shine my flashlight on them and watch them stand on their hind legs and stare into the night wondering what the funny guy was doing in the dark.
Sun is almost outta sight
40m came to life after sunset and I finished with a respectable 20 contacts for about 3 hours of operation and was able to give some Christmas contacts to the needy fellow contesters who were chasing another certificate. What a great way to spend the afternoon… by the lake in the sun and outdoors playing radio.
Wow! Great way to bring together a lot of ham radio ops on a Saturday using all sorts of technology! Way to go! QRPSPOTS.COM is normally used by QRP ops to spot each other when we are out operating portable or to alert others of band openings. It was ALIVE with reports and updates from all over the USA and even a few DX ops adding input too! In addition, several QRP reflectors were buzzing with updates and info. What a great community effort this turned out! Congrats to all and thanks to QRP ARCI for helping get the word out.
Iowa High Altitude Balloon Project
One of the 4 States QRP bunch, Terry WA0ITP, provided the 20m beacon again and has some great info on his informative website.
But for me, the coolest thing was listening in on the streaming webcast of VE3EN and his wonderful IC-7700. Sure wish I had thought of recording a bit or doing a screenshot to share here. But what a treat to listen in and hear the beacon’s signal right up until touchdown. Thanks Kevin for a fun way to eavesdrop on this event since the lawn mowing crew took over my condo’s yard and didn’t allow me to put an antenna out today. There is a ton of info and creative website construction on Kevin’s website and it is worth spending some time looking at the solar cycle data.
Congrats to the team for a successful event today and for bringing so many hams together for a good learning experience and something out of the ordinary. Well done W0OTM, well done indeed!
Here’s my dilemma:
I am a rookie homebrewer. My kit experience is good, but I have struggled to build direct from schematics. Part of it is my lack of ability to conceptualize the physical layout and part of my challenge is lack of building experience and mentoring.
What should I use?
Several of my antenna tuner projects seem to have a TON of hand capacitance effect. They are built in plastic cases, some from the Shack and some from the local surplus shops and hamfests. Most commercial tuners are built in metal cases and I wonder if that would eliminate the sensitivity to the tuning hand?
I have a couple metal enclosures I can use and a great ham friend sent me some thin copper with adhesive tape on the back. I am thinking of slapping some copper tape inside the plastic cases and see how it works.
So, I am putting it to the vote:
Which material should I build with?
Total Voters: 14
And for the record, the vote in the poll for best ham radio QTH in the US was won by West Virgina. Here is the top 5:
Thanks and 72,
The QRP-L reflector has been buzzin’ with the news and chatter (positive and some negative btw) about a new project to design and build a new transceiver for QRP HF use. YAHOO!
K8IQY Style Test Setup
What I love the most about this is that the QRP community is able to contribute ideas, resources and participate much like the Open Source software community operates. This could really be a fun project for our Central Florida QRP group. After all, we are not that far from Diz W8DIZ who is facilitating and coordinating this project.
If you like to build, experiment and try some QRP operation with a new rig… you should tune in and join the fun.
This is the last week to vote in the poll on my blog for the best US QTH for ham radio… Here’s the standings as of Sunday at 2100 EDT:
You can cast your vote by following this link!
Kelly K4UPG PB #173
Spent my birthday participating (casually) in the Straight Key Century Club Weekend Sprint. My Lake Fredrica neighborhood site was where I set up my shelter and 3 antennas. I had a 40m dipole fed with twinlead up 40 ft and running E-W. An End Fed Halfwave for 20m was nearly vertical suspended by a nearby tree. A twinlead 44 ft doublet on my 20 ft Jackite with the ends at 16 feet was setup running N-S to give me a bit of a mini-smorgasbord of antenna choices. Since it was really sunny, I hooked up my ACME GC100 Solar Charger and VW Solar Panel.
Bands were decent with 40m quiet and some DX coming through early from Eu stations. Nice to hear that again. 20m came alive and was pretty much the go to band for the majority of the day. I did check 15m a couple times but did not hear much and no one replied to my CQ’s.
In the middle of a QSO, my Jackite pole decided to collapse but I was able to finish the QSO with one end of the dipole about 4 feet above the ground. hi hi
The highlight of the day was my last QSO with EA3NO, Lluis in Spain. As the special station for the sprint there was a lot of competition but Lluis hung in there with my weak signal and pulled me out of the crowd after a couple attempts. THANK YOU FOR THE BIRTHDAY PRESENT Lluis!
Still wondering what a CPG is? Contest Point Giver! I am a really casual contester. Really the only reason I participate is that contests offer a fairly good opportunity to make some QSO’s. When you are QRP you have to do a lot of listening, plus pounce and search, but serious contesters will dig out weak signals to make the QSO’s so it is fun. I enjoy giving out points and reading the mail on ops that are faster than my cw comfort zone. Good practice, eh?
Here’s some photos from the day. Enjoy!
Kelly K4UPG PB #173 SKCC #5415
Had a great time setting up the C Pole antenna in a tree suspended configuration. My good friend and cohort, Jim Diggs, K4AHO came by with his AIM 4170 Antenna Analyzer and we were ready to tune the antenna and get a feel for it.
LESSON: A good analyzer makes tuning an antenna fast, simple and accurate! The AIM 4170 gave us a TON of info (most of it going over my head) and let us see how the C Pole was doing in several areas. Take a look at this output! (Click on the image for a larger version)
K4UPG C Pole Scan Results
LESSON: I followed Niel’s directions, but did not have a small plastic coffee container so used a Quart Coke bottle instead. So I call it a Coke Choke and it seems to work well. Here’s a photo to show it off!
Coke Choke Ready for Duty
I think this one is a keeper. Goes up easily, hears well and loads nicely too. I made a few brief contacts and called it a day, but look forward to more C Pole action in the days ahead.
p.s. Don’t forget to vote in the Ideal Ham Radio QTH poll on the blog!
Labor Day here in the USA! So a day to play for most of us. Depending on the weather I may get a bit more on air time, but I have a project lined up too.
Some time ago I purchased a Deluxe Tuner kit from Dan’s Small Parts and Kits aka a QRP Mini Tuner by Mark L. Meyer as described in a 73 magazine article. It is a nice little set of parts and a schematic for the price.
QRP Mini Tuner Kit
So I’m thinking this holiday might be the time to build that little T tuner out and see if I can load up the downspout that runs down the side of my back porch. I’ll let you know how it works!
Hope the bands hold up. Tonight’s QRP-L has a message from N4QA about how nice 40m is sounding right now! Sure would be fun to have our bands back from the QRN and low sunspot streak of late!
Here’s an email from my good friend and cohort in the Central Florida QRP Group. Jim wanted to share his latest mods for the Rockmites and some thoughts on the NEScaf filter. I think you will enjoy his notes too …
Kelly,
I thought I would bring you up to date on my latest project. I just finished a Small Wonder 20+ and used it on the Flight of the Bumblebees. I found my earbuds a little weak on audio output and the IF bandwidth of the SW20+ a bit wide for my liking. I read the specifications on the NEScaf filter offered by the New England QRP group and decided that that would be the best solution to my problem and be usable on other radios as well. I ordered, built and installed the NEScaf board in a TenTec TG-24 enclosure. I tried it on the SW20 and it sounded like a viable solution.
The Rockmite and NEScaf filter in Ten Tec Enclosures
I also have a 40 Meter Rockmite in a TG-24 enclosure and decided I would see how well the RM/NEScaf combination sounded. The Rockmite, of course, uses a DC receiver and the bandwidth is determined by the upper response of your ears… My RM sounds like about 40 khz wide, hears the whole band for me as my response is in the upper tens of kHz. Yes, I know, at my age 69 it shouldn’t be but is. Been tested. At any rate suddenly the Rockmite bandwidth is manageable. I had some audio artifacts, whistles and the RM sidetone would drive the NEScaf into cutoff which only a power cycle would clear. I googled the problem and Charlie KE2SP advised lowering the NEScaf input Z with a 10 to 47 ohm input load. I installed a 27 ohm resistor on the input connector and suddenly all artifacts, whistles and sidetone problems disappeared. WOW, the RM is really sounding great! Except the RX/TX was very low. I measured it at 500 cycles and the NEScaf would not tune down that low…
Closer Look at the Finished Rockmite and NEScaf
After considering several approaches to the problem and considering that the RM crystals don’t oscillate on exactly the QRP frequencies, I settled on completely revamping the RX/TX method used in the RM. Using the RM40 as a test bed, I removed D5, D6, R9 and R10. I purchased 2 Murata trimmers( TZ03 Series) from Skycraft, our local Surplus emporium, and installed them in the holes for D6 and D5, R9 combination of holes. I had to cut a small run on the right side (antenna connector side) to isolate that pad from Vcc and jumper to two trimmers together… I also had to drill out the pads to accept the trimmer leads. The Fet Q2 does a great job in switching to second trimmer in and out for the offset. The alignment was not difficult but I recommend using a freq counter connected thru a times 10 scope probe to the physical top of R5 (base of Q5). Don’t have to key the Tx to see the freq… I set the trimmer in the D6 position for the higher freq (7.030750 Mhz) and the other trimmer for the lower frequency (7.030000 Mhz. The trimmers I use are available at Digikey. I used the Red colored model (4.2 to 20pf, N750) but the Blue colored (2.7 to 10pf, NPO) might have been a better choice. These guys are Digikey p/n 490-1971-ND and are $0.43 each… I also changed the RM40 volume control from an audio control (1 Megohm) to a RF front end attenuator control (1.5 kohm) and there is a noticeable improvement in the overload and broadcaster breakthru problem. I strongly recommend these changes. If you can build the RM you can certainly modify it… If you break it, build another… I plan to make the same modification to my RM80. (CLICK THE THUMBNAILS for larger view)
Rockmite Mode Closeup 1
Rockmite another closeup
The Inner Workings of the NEScaf and Rockmite
How did it work? Well, the RM/Nescaf stack is now a real radio not just a toy. I worked WD8MHT Raul in Waynesville, NC one morning this week and we had a great conversation. He was 569 to me and I was 439 to him. His TS570 was working hard but copied me no problem. The amazing thing for me was that there was a really strong signal at 700 cycles and Raul was about 200 cycles higher. I tuned the Nescaf center freq on Raul and sharpened the bandpass and turned up the volume and he was armchair copy the entire QSO… WOW, not a struggle… I have since used the NEScaf on my SW20+ and yes, it works great…
I have attached a couple of pictures of the stack and the innards of the RM for reference. The switch on the front is for a future expansion.
72
Jim
K4AHO
Now into the third week of my sabbatical, I am surprised how much I want to get out and operate my QRP portable gear. Guess I have deprived myself over the years of being a confirmed workaholic and avoiding time off, vacations, and time for my favorite hobby.
Grrrrr! The Polar Bears Are On The Loose!
This should be a good weekend for QRP portable. The Polar Bear QRP Group will be out for another Polar Bear Summer Picnic Event and Polar Bears from Spain to the West Coast of the US will be out looking for BSO’s. Grrrrr! I am PB #173 and we’re over 200 members now. With the new Twitter and APRS connections to QRPSPOTS.COM which also point to the excellent spotting site of K3UK with a section for FISTS/QRP Ops to spot and sked one another, there are plenty of ways to use technology to help find each other. Add in a few other contests and state QSO parties, and there should be some buzzing going on this weekend. Makes me wonder when the FOBB results will be announced! Buzzzz Buzzzzz
I’ll be out and if all goes well I will be field testing a new C Pole antenna based on the suggestion I received from Neil W0LVZ. I added some switchable capacitance to my BLT+ and have rewound the main toroid to see if I can push the range a bit more with it so will have a delta loop and probably my W3EDP in the air too. I love playing with antennas and am still amazed when the ones I build actually make contacts!
Give a listen for me on the QRP watering holes on 40m, 30m and 20m Saturday morning. I’ll be self spotting on QRPSPOTS and the K3UK sites to make it easier for you to find me. Let me know how my newest antenna is workin’.
PB #173
