Posts Tagged ‘Elecraft’

Cooler KX plus heat-sink

The Cooler KX plus heat sink installed 
From my previous posts my readers know I am now in the process of delving back into the digi modes with my Elecraft KX3. With the digi mods there are long duty cycles and thus the PA's in rigs sure do get a "hot" workout. In the KX3 if the heat goes to a certain point the power is rolled back to not damage the PA's in the rig. There are other events that can cause the rig to roll back power but operating in the digi modes is sure high on the list. Not wanting to operate on reduced power and not to say bringing the rig to this point really can't be good for it I have a choice operate a lower power or find some way to keep the finals cool. The heat sink on the KX3 is good but not great and therefore a
Cooler KX plus compared to stock
product called Cooler KX comes into the picture. This is a very easy upgrade to the KX3 and has been designed to not take away from the KX3's styling. The company is Canadian and Fred VE7FMN has done a very professional job on adding extra cooling ability to the Elecraft KX3. There are 2 heat sinks that are offered and they are the Cooler KX lite and Cooler KX plus. I ordered the Cooler KX plus and am very happy with my purchase. Once I placed my order Fred was in contact with me via email asking very important and clarifying questions to make sure my installation went without a hitch. The heat sink arrived very well packaged and with all the hardware needed for a trouble free instal. The instructions that came via email from Fred were very well layer out and easy to understand. I am never excited when ever I have to take apart either my Elecraft K3 or KX3 as this is the time things can get damaged. The heat sink upgrade is fairly straight forward and easy to do compared to let say the sub-receiver addition to the K3 now that to me was a nail biter. The heat sink instal involved removing two nut and bolt configuration to release the
Two PA's fastened to heat sink 
two PA's from the heat sink and then 2 more screws that secure the heat sink to the radio. It was basically the reverse to instal the new heavy duty heat sink from Fred. If you own an Elecraft KX3 I would recommend this upgrade as no matter what mode you are operating in your PA finals will be cooler and thus a longer life for the KX3.

Giving PSK31 a go

Last weekend I was able to setup my Elecraft KX3, Toshiba netbook and Signalink for digital operations. The first mode I chose to try out was PSK31 as I had used this mode in the past and was somewhat familiar with it. The software I chose to go with was Digipan and again it was software I had used in the past. The sound card set up as I remember can be very frustrating but Signalink has provided a very good step by step setup for windows 7. Once I was finally setup and had the software and rig co-operating I only had time to receive some signals from the waterfall. Seems the setup is working just fine on receive (20m at the time) as I was able to decode France, Germany, U.S and Italy. I did try to answer some CQ's and was not heard but as I said time was running out for radio time and I had to pack it in. Some if the kinks that still have to be worked out are….
1.  Getting the macros set up the way I want them.
2.  Fine tuning the settings on the KX3 for digi operations.
3.  For some reason the output on the rig is set to 5 watts but the Isoloop control box only shows 1 watt              output but I also have my LP100 meter hook in (which for some reason started working fine again) as well and it shows about 4.87 watts.  Im going with the LP100 meter.
4. Digipan does not have CAT control Im told you have to use another program for that. CAT control is nice for band changes compared to dialling band changes.

Field Day 2014 – Wow!

That’s all I can say – wow!  A magnificent time was had at the first Field Day for the South Plainfield Radio Club.  I posted the following to QRP-L, and I’ll insert some other thoughts at the end.

The South Plainfield Amateur Radio Club operated Field Day in Spring Lake Park in South Plainfield, NJ. We used Club call NJ2SP, and ran as 2A (Battery). The “2A” were two Elecraft KX3s. The CW station ran to a EARCHI antenna (53 foot radiator, 9:1 UNUN, 25 foot length of coax). The elevated end of the EARCHI was about 30-35 foot up in a tree. The SSB station used a G5RV, about the same height between two trees.

Our operating position behind our club banner. 
And if you look closely (click on the picture for a bigger image) you can see the EARCHI antenna sloping upward and away towards the tree it was anchored in.

The EARCHI antenna was a resounding success. The KX3’s internal tuner handled it exceedingly well on all bands. We made just a tad over 270 CW QSOs, with our best DX being Hawaii, Puerto Rico, the US Virgin Islands and the Cayman Islands.

Dave W2OIL and Marv K2VHW working on deploying G5RV feedline.

The G5RV worked exceeding well, also. The KX3 again tuned without a hiccup. The SSB team completed just over 100 SSB QSOs – these guys are all QRO ops and they were skeptical about completing even a single QRP SSB QSO. They ended up surprising themselves, and they ended up being quite amazed at what they were able to accomplish. Yes, it was not as easy as using 100W rigs, but even in keeping with the ARRL’s 5 Watt limit for the battery category, they were quite pleased.

 Power source for the laptops

Power source for the CW station

We operated on solar charged batteries all weekend without a hitch. The energy hogs for the weekend were the two laptops that we used for logging. The Field Day rules state that since we were not using the laptops for rig control, we could have powered them from mains (which we did not have) or a generator (which we had, but didn’t use). In keeping with our self imposed “severe emergency capability” theme in order to make this a drill as much as possible, we also powered them off a deep cycle battery using an inverter. We needed to switch the laptops over to a fresh battery somewhere in the mid morning hours, Sunday.

SPARC’s first Field day was an outstanding and unqualified success, and I think we ‘busted’ the myth that Field Day has to be QRO to be fun.

~~~~~~~~~

The EARCHI worked great and way better than I dared hope for. With less exceptions than I can count on one hand, I was able to work everyone that I tried to.  Being on an energy budget because of the batteries and wanting them to last all weekend if possible, I didn’t try calling CQ or running a frequency (it was S&P all weekend).  I will reserve that for FOBB and the Skeeter Hunt, which are only four hour events. I can afford to be a little “battery foolish” during those, and I expect the EARCHI to work just as well during those two events.

Our publicity table.

The other Godsend of the weekend? That Joplin ARC antenna launcher kit that I purchased and built up. We were able to place antenna lines pretty much exactly where we wanted with hardly any effort at all.  That thing is one of the greatest things since sliced bread! One or two of the guys were skeptical about being able to place an antenna line so easily and accurately with such little effort. The old saying is “That seeing is believing”. They’re believers now!

The VHF/UHF antennas for our GOTA station.

Protection from South Plainfield’s Finest!

We had wonderful support from our Mayor, Town Council, Office of Emergency Management and our Police Department.  They even parked a car by our site for the overnight, to act as a deterrent against any potential mischief makers!
Tim AB2ZK making SSB QSOs in the dead of night.

Marv K2VHW taking a late night turn at the CW station.

Dawn breaking over South Plainfield on Sunday morning.

Field Day aftermath. 
After being awake for 24+ hours, I fell asleep while waiting for the Mayor to show up late Sunday morning. I woke up in time for his visit, though!

Being in the park, we had a lot of curious people come by.  We answered any and all questions and we handed out quite a bit of ARRL printed material about Amateur Radio. An encouraging sign was that several parents came by and wanted more information for their tech minded offspring.

Squeezing out some last minute QSOs as Field Day draws to a close. Tim AB2ZK on phone, W2LJ on CW.
The moral of the story is that Field Day is fun!  It doesn’t have to be elaborate to be a success. With two wire antennas and two QRP rigs anchored at 5 Watts, we had a blast.  Oh, and we made the local paper, too!  http://tinyurl.com/ls56z6u  Some of the details were not exactly reported accurately, but it was good exposure for Amateur Radio nonetheless!

In closing, I’ll answer a question that was posed to me by a member of the visiting public, the way I wanted to answer it. A woman asked me if it was a bit extreme staying awake throughout the 24 hours of Field Day. Of course, I gave her the answer of “In the event of an emergency or a natural disaster, sleep may very well be a luxury, …….” Yadda, yadda, yadda.

What I wanted to say was any of the following:

1) It’s Field Day! Sleep is overrated!
2) Heck no Lady! Field Day is fun!

Or I could’ve gotten all Clint Eastwood and said:
3) Ma’am? I’ll sleep when I’m dead!

One final, last added mention.  Last year, Marv K2VHW introduced me to Deep Woods Off moist towelettes.  They are a must for the Field Day Go Package. They worked extremely well, and I was not bothered by a single “Skeeter” (pesky little fellows, I should have had them pound brass!) all night long.

72 de Larry W2LJ
QRP – When you care to send the very least!

One step closer to going digital!

The digi setup
For some time now I have been thinking of getting back into the digi modes, I do have a setup that offers QRP power levels and a narrow bandwidth antenna which can be perfect for digi modes such as JT65 just for starters. In the past I had the Signalink USB interface but ended up selling it when my mode of choice seemed to be CW. I came across a used Signalink USB unit for a great price so I scooped it up. I am planning on setting up my Elecraft KX3 for digi operations and leaving the Elecraft K3 setup for CW. Last I wanted to make use of a Toshiba net book I have had collecting dust for some time now. The net book runs Windows 7 home addition and after loading a fresh instal of
Discovery soldered jumpers
Windows 7 on the net book it's ready to go. The used Signalink did provide a surprise once I opened it up. Inside the unit you will find some jumper wires that have to be moved around depending on the rig you are using with the interface unit. The unit I purchased was not being used with the Elecraft KX3 so some jumper swapping  was in order. To my surprise the jumper wires were soldered in place! Signalink had designed the jumper positioning as a non solder setup using a 16 pin IC socket, this way you could remove the jumpers and reconfigure just in case you changed out your rig. My plan was to see if I could remove the wires and see the damage to the IC socket. After the wires had been removed, solder sucked out and some melted plastic on the socket removed I decided to just add some fresh jumper wires. It's now time to set up the net book and get it communicating with the Elecraft KX3.
IC socket cleaned up, wires removed
 
New wires in and ready to go

A Friday evening nets some DX contacts.

On Friday evening I was able to pull some radio time out of my hat and it was time to try my MFJ 1788 loop antenna on 17m. I was very happy with the results it was very easy to tune (SWR of 1.2.1) and the band width was decent so retuning was not needed most of the time. I operate QRP at 5 watts so having the antenna on the balcony, it also being a small loop antenna plus QRP it's a bonus when I contact some DX.  I first heard S59AA calling CQ at 18.078 and my first attempt was not heard and another station jumped in and made his contact. I threw my call in again and I was heard and given a 559 signal report.  Franc was located in Slovenia and was operating an Elecraft K3 he was also booming in. The time was 5pm local time and 17m seemed to be wide open to Europe so I decided to spin the dial and see what else the ham god's brought my way. I then made contact with HB9CVQ in Switzerland, again another bonus for my ham setup. I was given another 559 RST but again I am just fine with that. I emailed both S59AA and HB9CVQ to give them a  little more details of my station but most of all to thank them for sticking with me and passing along a 559 signal report. I did hear back from Andy HB9CVQ who passed along some info about his station as well and it too included an Elecraft K3 radio . I try to avoid using the spotting clusters as for this tiny station hopping over to a busy spot just does not end well. I did spin the dial for a final time and I came across KH2L in Guam! In the past I had tried to make contact with Edward as he booms into here and I was not able too. Friday was no different I dropped my call but it was not heard by KH2L.....oh well. It's now Saturday afternoon and the bands are in so so condition I ended up spending time writing this post with the radio cans on.

SWR up’s and down’s

LP-100 reading
I was on the air the other day using the MFJ loop and as I was trying to tune to the lowest SWR reading I noticed an odd thing happening! Available to me at the station are 3 separate points to view the SWR. I have the SWR reading on the K3, the LP-100 and the MFJ remote control for the loop antenna. While tuning the loop antenna I was able to get an SWR of 1.5.1 on 20m with the K3's meter this is a very decent reading. I had the same reading on the MFJ remote unit but the LP-100 was showing 2.08 SWR??? The way the meters read the SWR are as follows.....the K3 right at the radio, then the LP-100 and then the MFJ remote unit. Oh and in case you are wondering if I am SWR meter crazy, I have the LP-100 in the game plan as it also reads very accurate output power and when operating QRPp it comes in very handy. . as for the MFJ remote that just comes with the antenna package and is really used to adjust the antenna and I really don't rely on it's SWR meter. I have heard and read in the past that the remote MFJ meter should not be relied on to much. ANYWAY.............I am getting this odd reading on the LP-100 and it is on all bands that I get a differing reading from the other SWR meters. First thing that came to mind was faulty coax or faulty
K3 meter
LP-100. I bypassed the LP-100 ( I removed the LP-100 and attached the two PL-259 using a SO-259 coupling) using all the same coax that fed the LP-100 and there was no problem. I then setup the LP-100 on it's own, meaning out the K3 through the LP-100 into a dummy load and there was a perfect match. Then I simply removed the SO-259 coupling and added the LP-100 again....there was the funny SWR again. Not sure what is going on here. In my trouble shooting I tried the LP-100 on it's own into a dummy load and it worked fine. I then used all the same coax cables and bypassing the LP- 100 and all was fine. Therefore LP-100 is fine and cables are good??? Not sure what is going on here.

Some more PX3 photos

Courtesy of Facebook postings:

72 de Larry W2LJ
QRP – When you care to send the very least!


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