Archive for the ‘qrp’ Category

My Elecraft KX3 has a ping??

This afternoon I was planning on setting up the Alexloop into the living room and try some operating with the KX3. I was wanting to see how the loop worked in the living room. I was going to bring it on the deck but there was the threat of rain. Out of the blue when I was on 15m  in CW mode whenever I keyed a letter and then released the key I would hear a very loud "ping" in the headphones. This only happened on 17m, 10m and 15m. I tried changing the headphones, using a dummy load and reducing the power to 0 but there was always a ping noise heard in my ear? I am not sure if I inadvertently changed a menu option that is causing this. This brought the living room KX3 operations to an abrupt end and off to the internet to see what was going on with the rig. I have posted the question on the Elecraft reflector as well as here on the blog.
Problem has just been solved seems if I have the rig on dual RX and VFO A and B are very close to each other I am picking up "me" on VFO B. Which makes sense and when in dual mod the head phones are split with VFO A in one ear and VFO B in the other. This would explain why the ping was only heard in one ear!

Have you ever been listening to something that may not be there???

Thought it was time this evening to power up the K3 and see what was on the bands. The software  I use is DXLab and it comes with a spot collector as it's called. I noticed a spot for AX7GN on 20m so I double clicked on the spot and the K3 magically was there! So here I am listening for AX7GN and yes there is a station there calling what sounded like CQ....or did I want it to be a station calling CQ? Well I hoped it was not little voices in my head talking to me. I heard nothing so I just put my call out there....and listened just maybe a little to intently. I did hear what sounded like VE? VE? By this time the APF was on the RF gain was being adjusted and the filtering narrowed.  I gave the call again at a deafening 5 watts!! Between the static and the ringing sound from the APF  I thought AX7GN was giving out what  "KINDA" sounded like my call.....or was it those voices again!! I passed along a 559 but did not hear much in return. To be honest I am not sure what the heck happened.....did I want to hear my call so bad that the static kinda sounded like VE3WDM?? For a short time I listened to the band and low and behold AX7GN was there and answering some U.S calls! I'm not going to put this one in the books as I am just not 100 percent it was just not the DX voices playing games with me. Has this ever happen to you??

Multi-Band 4 Foot Magnetic Loop with Gamma Match

 

4 Foot Diameter Magnetic Loop In Operation

 

4 Foot Diameter Magnetic Loop In Operation

As my mag loop projects progress, I’m learning a lot about building them and using them. This antenna works on 17, 20, and 30 meters, with the best bandwidth on 20 meters. The bandwidth on 17 and 30 is quite small but usable. There is a 20 KHz bandwidth on 20 meters. I used a vacuum capacitor to build this particular loop for 100 watt operation. The air capacitors are good for QRP but will arc over using much power over QRP levels.

4 Foot Magnetic Loop Antenna with Gamma Match

4 Foot Magnetic Loop Antenna with Gamma Match

This photo was taken before I trimmed the Gamma Match.

I didn’t know how long the Gamma Match should be, so I made it long enough to allow for trimming after the match to 50 Ohms was made.

This is the first mag loop that I made with a Gamma match. I like this match better than the usual Faraday feed loop that is featured in my previous mag loop antennas. Matching is easy and building the Gamma match is not difficult. I’m planning to build other smaller loops that will also feature the Gamma match. The smaller loops will target 10, 12, and 15 meters. Loop size determines which band its best suited too. Although it is possible to get more bands on one loop, the bandwidth is small and the tuning ‘dip’ is very sharp. I found it better to limit the number of bands in favor of wider bandwidth and antenna efficiency.

Please look up my previous posts for more details on parts and plans.

 

 

 

Clamp Connects Gamma Match To Main Loop

Here is a good close up of the clamp.

(Before Trimming)

 

Gamma Match After Trimming

Gamma Match After Trimming. This enables a 50 Ohm Match for all three bands.

 

 

 

 

Gamma Match Clamp, PL 259 Coax Connctor, and PVC 'Tuning Aid Pipe

 

Gamma Match on the left, PL 259 in the center and, Tuning Aid Stick (PVC) pipe , on the right.

The vacuum capacitor is ‘tuned’ by twisting the PVC pipe that is attacked to it with a cotter pin.

Tuning the cap to the ‘loudest noise’ on the air will put you in the ball park for operating.

You can also use an antenna analyzer if you want to know the exact SWR, and RR of the antenna.

Tuning with a radio attached is fast and easy.

 

Making a Gamma Match 2

Making the clamp for the Gamma Match

 

Making a Gamma Match

Soldering The Back Plate and PL 259

 

 

Removing Oxidation

Removing The Oxidation Before Soldering

The main loop is 5/8 inch, soft copper tubing.

 

 

 

Soldering The Gamma Match to the PL 259 Connector

Close Up of PL 259 to Gamma Match Joint

The center of the PL 259 had a #10 solid copper wire inserted and soldered in place.

The Gamma match is 3/8 inch soft copper tubing.

This part of the job was done with a soldering iron, the rest was done with a plumbers torch.

 

 

Third Hand, Helper Clamp

 

Handy ‘third hand’. A clamp to hold the Gamma match in place while I soldered it.

My town was going to hire a ‘Mad Scientist’ but it couldn’t afford one, so they settled for a ham radio operator instead. Me!

73 de AA1IK

Ernest Gregoire

The Alexloop vs my attic dipole

The new Alexloop antenna
Just over 2 weeks ago I placed an order for the Alexloop,  For some time I have been debating what antenna to use when I was out and about with my KX3. I looked at the Miracle whip, Par end fedz antennas and the Alexloop. For my needs it boiled down to the Alexloop. I did have a miracle whip in the past and it is a great antenna but just not worth the money for the performance you get. The Alexloop was ordered and arrived within a week and a half!! I was very impressed with the reviews online and the testimonials at Eham. . The antenna comes in a very well made carry case that can be taken into the field with all parts contained for your setup......well almost all parts...a tripod is one of the recommend ways to setup the antenna for field work. There are other ways it can be deployed including holding it by hand (not as young as I used to be so this method my not work for me). You can clamp it to a pic-nick table or attach it to a chair....just for starters.  The unit cost's 299.00 and I will say this is not cheap but it's very well made and portable as well. The case that holds the unit is about 1.5 by 1 foot in total. I also want to add that the case is very well made with a shoulder strap and carry handle.

A quality case

So lets get to the nuts and bolts.....how does it work....sure anyone can say anything about their antenna but the proof is in the radio waves!!
Antenna location..cat standing guard

I wanted to do a comparison between my attic dipole which is the Alpha Delta DX-EE up about 30 feet in the attic and the Alexloop set up in my XYL's office just opposite my radio room. Let me state that this is not a comparison to see which antenna preforms better as that is not a fair comparison....but I wanted to see how well the loop did compared to my attic dipole. The Alexloop was mounted on a tripod....well ty-wrapped to it as the the Alexloop would not fit over the tripod center pole section. This is something I will have to work out later. Each of these antennas have their disadvantages....the dipole is in the attic, this means a wooden roof above, rafters all over and insulation below. The Alexloop is in a second floor room, it's a small loop antenna and very close to the ceiling. So really both antenna are far from ideal when it comes to location.
Temp tripod mount
For the rig I used my Elecraft KX3 (as this is the rig I will be using when in the parks, backyard and where ever else I decide to go!) The power output was set to 5 watts and the bands I chose were 20m and 40m. The plan was to run coax from the Alexloop to a 2 position antenna switch and switch between the two antennas. The Alexloop did not seem to take a liking to the added coax. I was not able to get the SWR down below 2. Once I used the length of coax that came with the loop (about 10 feet) all was well. This just meant I was going to have to connect and disconnect the KX3 from one antenna to the other for the comparison. I was calling  CQ on 14.060 and 7.020 on the attic dipole and call CQ on 14.050 and 7.032 on the Alexloop and check out the Reverse beacon network to see who was picking up the CQ call. Not sure if the conditions were not all that great but both on 20m and 40m the attic dipole just got hits in the U.S as did the Alexloop. There was one big surprise when the Alexloop had a hit with OL5Q (along with the attic dipole) I was very impressed that a loop antenna in a bedroom was able to get a report from OL5Q!!
My overall impressions of the Alexloop are as follows:
1. Shipping was fantastic, this antenna got here from South America faster than products I have ordered from the U.S.
2. The support is great, I had a question about the loop when it arrived and it was answered within 30 minutes!!!!
3. This unit is quality quality quality from the carry case to antenna!!
4. The tuning was a cinch, turn for peak noise and then transmit and tune for lowest SWR....takes about 20 seconds!
14.060, 7.032 Alexloop
5. Assembly is done in 4 minutes for a first timer and I imagine with practice I can cut that time in half.
6. Antenna foot print is very low profile and can be used vertical or horizontal.
7. The SWR on 20m and 40m (only bands used so far) was 1.4 at 14.060 and 1.7 at 7.032.
The bottom line is I am very very impressed with this antenna and I will be taking it to the field and updating the blog on how it does.  Up to this point would I recommend this antenna.......dam right I would it's support is excellent, quality of the product is way above par and so far the results have been very impressive.
 

Time to do some kit building

Oliver is keeping an eye on things
I was on the radio this afternoon and not much was on the WARC bands   (CW contesting on the other bands) it was time to spin my chair 180 degrees to the project desk. I am in the process of building another Elecraft K2 that when done will be put up for sale. This was supposed to be a winter project but the bands were busy and I was on the radio and not the soldering iron. Now the K2 build has become a spring project. A few years ago if I was asked about kit building I would not ever considered it....BUT...I have been bitten by the bug!! Along with my QRP and QRPp operating I also find kit building to be a very relaxing way to spend time. There are some kits which I have sold such as my Elecraft KX1 and
Control board completed
Some tricky lead forming
LP-Pan. Funny thing is after building something you attach a personal ownership to it that over the counter commercial equipment does not have. I have sold many items purchased but not built and thought nothing of it (other than it was money to get another kit with...maybe time for kit builders anonymous). As for the kits when it came time to say goodbye to make some coin it took some thought before they were put up for sale.
As was said I am in the process of building another Elecraft K2 and I have another blog that deals with the build. I wanted to blog the progress but also highlight other areas such as toroid winding, what was needed to be a kit builder and so on. There are specific posts about the K2 build it self making mention of tricky sections of the build and how it was handled. It's now time to see if the bands have come alive!!

A very nice but short evenng on the radio

No time to do lots
There was many things to get done this evening (far from being done) and not much time to do them. I had emails to answer, two reviews to write for Eham, get some radio time in and post on the blog! So I was shocked this evening to find 20m alive and well. The wind has died down out this way and that means the 230kv lines outside the house had stopped moving about. They sure were giving me loads of interference right across the band. That is for another days blogging complete with YouTube action as well. This evening I first ran across 9A2N from Croatia  and his signal ranged from S4 to S7. I gave him a go with 1 watt, then 2 watts but I was able to make the contact with 3 watts.

 I  then found LZ833MBB...how is that for a call!!! This call is a special event station call and is in honour of Bulgarian Saint Martyr Knyaz Boyan Bylgarski.. I was able to work this Bulgarian club with just 1 watt.

Finally I moved on to 9A7R who is from Croatia as well and again got my contact in with just 1 watt. This evening the high flux and sunspot numbers sure are starting to pay off. I am going to have to get in on the action again tomorrow but for now it's off to other items on the check list.

Adding my two cents worth…………

So here we are....it's the weekend and time to get some radio time in as during the week I find it very hard to get into the shack once all the household chores are done. I have been trying to get a good score for the Marathon challenge this weekend. It is a QRP type challenge that involves you contacting stations via the lowest possible QRP power. I have come to learn that if the station you contact is also QRP you get more bang for the buck when it comes to scoring in this challenge. This leads me to my post today......I have been hanging out at the QRP calling frequencies and on 10m, 15m and 20m there has been lots of action. Now the action I speak of is not a QRP station calling CQ BUT  stations who is in a QRP contest calling CQ contest on QRP calling frequencies!! Maybe I am way off base here but.....a little bird in my head is telling me that this is not right. What's your feedback...if you are QRP is it good to call CQ as well as CQ contest on QRP calling frequencies??

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  • Matt W1MST, Managing Editor