SKCC 5123T----- FISTS 14979----- Flying Pigs 2331----- NAQCC 3610-----QRP ARCI 14176-----Polar Bear 257

Tuesday, January 16, 2018

Anticipating Winter Field Day Jan 27/28

In less than two weeks, it will be Winter Field Day. I have a campsite at Falling Waters State Park near Chipley Florida reserved for Friday and Saturday night. WFD is a 24-hour event starting at 1 PM CST Saturday, January 27th. Our call will be N4Y,  category 2O for two transmitters outside. Our ARRL section is Northern Florida (NFL).

Amateur Radio Field Days have an emergency preparedness angle, but they are lots of fun to plan and do. It is also an opportunity for social activity among hams. This WFD I have partners Bob KK4DIV, Dennis WA6QKN, and Chris VA3ECO among others. Bob KK4DIV has the campsite across the road from mine.

Staging the KX3/PX3
I always wanted to do a QRP Field Day. Well, this is my chance. My primary rig will the Elecraft KX3. The WFD rules define QRP as 5 watts on CW and 10 watts peak for digital and phone. The gear will be powered by LiFePO4 batteries from Bioenno. I have enough battery for a 100 watt Field Day so running QRP should not be an issue. An adjunct to the Elecraft KX3 will be the Elecraft PX3 spectrum scope. In addition to spotting signals, it has a text display and a keyboard interface that helps you do PSK-31 without a computer. It also supports keyboard macros that will apply to CW as well. I will run the N3FJP Winter Field Day Log on a laptop.

A view of the 100-foot loop
The antenna will be a 100-foot loop 30 feet across 20 feet vertical fed at the bottom with an Icom AH4 tuner. This antenna takes up only 30 linear feet, needs no trees. and was designed to fit the campsite. The antenna has carried the day many times since ARRL Field Day last June. I am using an ArtCraft box to control the AH-4 from the KX3.

We will be trying for one satellite contact during WFD for bonus credit. We will see if the sats can be worked among the trees. For shelter, I plan to use a Coleman 8 person tent. I am not expecting brutal cold, but there may be some rain. I have spent the least amount of time on what to eat.

Eight Person Tent

Even if you are warm and snug at your shack, N4Y welcomes your call.  For WFD you would be 1H one transmitter at home. If you are going remote for WFD post your plans on the Amateur Radio Field Day Google Plus Community

Friday, January 5, 2018

ARRL 2018 Grid Chase EL79 New Years Day Activation

The 2018 ARRL Grid Chase is a year-long activity focused on working grid squares. The goal is to work as many unique grid squares as possible. Contacts must be uploaded to Logbook Of The World by both parties to get credit. The scores are available on International Grid Chase web page. Scores are reset monthly, but totals for the year will be kept. It is not necessarily a portable event. However, you can generate some interest in your portable ops by activating grid squares with fewer hams. My home QTH in Panama City is EM70. Our neighboring grid square EL79 is mostly salt water. That makes it a good candidate. 

The van with the loop antenna behind it
Dennis WA6QKN and I decided to activate Grid Square EL79 on New Years Day. We chose to travel to St. George Island State Park about 70 miles from Panama City. The park is KFF-0635. The temperature was in the 30s with some wind. To pull this off, we operated Sonic style (ala the TV commercial) which was Dennis and me in the front seats of the van. We used the Icom 7100 with its own battery. The antenna was the 100 ft loop supported by three poles. EL79 is sought by satellite operators who routinely chase grids. So I brought my portable satellite gear. We had a special request from K6FW for a contact from California.

Dennis and escaped the cold in the van."Sonic" style
We planned to start with a SO-50 Sat Pass. Then we allocated two hours on HF followed by a SO-91 Sat Pass. So here is how it went.
  • 4 contacts on SO-50
  • 23 contacts on 40 meters
  • 60 contacts on 20 meters
  • 7 contacts on AO-91
  • 94 contacts total 44 have been confirmed on LOTW
  • According to the Grid Chase page, we had 30 unique gids.
  • There have been 151 QSO for EL79  in Grid Chase
The satellite setup with a Kenwood TH-D72a HT and an Elk antenna.

It started slowly on both 40 and 20 meters. The spots eventually kicked in. On 20 meters it was a monster pileup. So I am calling it a success. The loop antenna has been a winner every time I have used it. Dennis WA6QKN was a great buddy and a big help with antenna setup and logging. So expect a return sometime this year. I also plan to do some activations of EM61 in Alabama. There are not many hams in that grid.

Here is a video covering my portable satellite gear.

Sunday, December 17, 2017

Building a QRP Field Day Station

My goal is to build a QRP station for Winter Field Day in January and the ARRL Field Day in June. QRP or low power is 5 watts max for all modes during ARRL Field Day. Winter Field Day allows 10 watts peak for phone and digital. I like that. I don't think 5 watts is a problem on CW. However, on phone, it is a challenge. I have never used PSK-31 on Field Day so that will be a learning curve.

It helps to test the station set up in advance. The hub of my station is the Elecraft KX3 transceiver. A new addition is the Elecraft PX3 spectrum scope. Now add a computer and logging software, and you have a few things to integrate. My choice for logging software is N3FJP as they have a specific log program for Winter Field Day.

The Elecraft PX3 is excellent. Amazing how it integrates with the KX3. In my opinion, it gives you more capability than the spectrum scope on the Icom 7300. I like the way the markers work to let you QSY. Of course, there are buttons and features to learn on the PX3. And yes you can hook up a keyboard to the PX3. This enables you to type or use text macros for CW or PSK 31. This leverages on the built-in capability for these modes in the KX3. It is cool that the KX3, PX3 and the computer logging program all talk without any issues.

I also tried using the N3FJP software to generate CW for the first time. I bought a used WinKey box on eBay. The N3FJP software uses it to key the KX3. The WinKey also lets you hook up a paddle or straight key to go manual if you like. We will see how that goes. I am leaning toward using the PX3 keyboard do most of the work. That way I can have someone else assist with the logging on the computer.

I guess you can tell this is overloading my 8-bit brain. It will take some practice in the field to burn it in.. I have some opportunities operating portable for ARRL Grid Chase starting New Years Day 2018. Winter Field day is January 27/28. I have a reservation at a campsite in Falling Waters State Park near Chipley Florida. I have some friends planning to share the experience including Bob KK4DIV who is camping in the same park.

Monday, December 11, 2017

Dreaming of a Winter's Day

Those of us who can't get enough of ARRL Field Day will be out the last full weekend of January operating Winter Field Day. I have an outdoors location reserved at Falling Waters State Park near Chipley, Florida. We usually get a break on the cold weather in Northwest Florida, but there are exceptions.

I operated class 1B 2 operator for ARRL Field Day last June. It was a great experience. I am no seasoned camper but I made it through two nights. I was joined by Rick NZ2I for one night and he also was the camp cook. The antenna I built for the confines of the camp site was a big success. It is a 100 foot loop deployed 30 feet across and 20 feet vertical 10 feet above the ground. I designed it to fit in the camp site that will park a 30 foot RV. I have used it several times since Field Day and it performed well.

I will be at the same camp site and use the same loop antenna as last FD,  but I will go for the QRP category this time. I just noticed that WFD rules allow 5 watts CW and 10 watts peak on phone and digital. I would really like to see ARRL adopt that definition. I have in mind to also go QRP in the June 2018 ARRL FD. So WFD will be a test of my QRP station.

My choice of a WFD QRP rig is my Elecraft KX3. I decided to dress things up and add a Elecraft PX3 spectrum display and a heat sink for the KX3. I took the KX3 and PX3 for a test drive Sunday and I am very impressed with the PX3. I am interested in PSK-31 for Field Days. I have done very little. The KX3 built in support for PSK is enhanced greatly with the PX3 spectrum and waterfall display. Also, the PSK text is decoded in the text area of the display. I can see PX3 much better than my laptop. I brought up FLDigi on the laptop and my eyes don't jive with that tiny text font.

So my next step will be hooking a keyboard to the PX3. It will do the text macros and such for PSK as well as CW. I will also install the heat sink and do the temperature compensation. I will have a few outings before WFD to get comfortable with the KX3 and PSK. The computer solutions for PSK are great but I think the Elecraft approach will be fine for adding some digital contacts on WFD.

My friend Bob KK4DIV will have a camp site across the park road for WFD. Dennis WA6QKN and Chris VA3ECO have plans to come and play. It will be fun! I enjoy planning phase for these events. .

Monday, December 4, 2017

My WSPR Beacon Rocket is Launched into Near Space

I launched a WSPRLite beacon on my hobby rocket at the Dec 2nd rocket launch in Samson, Alabama. Weak Signal Propagation Reporter, WSPR, is a tool to study radio propagation. WSPRlite is a stand-alone WSPR transmitter or beacon. There is a network of WSPR receivers worldwide that post spots of beacons to I dreamed up an experiment to compare the reports of a beacon at altitude with a reference beacon on the ground. I chose the 20 meter HF band for this experiment.

Question: What is the effect on the propagation of 20 meter radio waves using a half wave vertical at a significant altitude over ground level.

Discussion: A rocket can be used to put a beacon at altitude for a short time. The rocket will ascend to an altitude of at least 1000 feet quickly and slowly descend to ground level under parachute. If I am lucky the chosen rocket will be elevated for the 2-minute transmission cycle of a WSPR beacon. The choice of rocket/rocket motors will affect the hang time.

I have a rocket with a payload bay.I will load the payload bay with:
USB Powerpack
WSPRite Module setup for 20 meters
LNR Trail Friendly End Fed matchbox with a half wave (32 ft) wire exiting from the bay.

Phase 1 Ground Calibration

Setup a Bravo 7K vertical as a reference antenna with a WSPRLite
Setup the rocket payload WSPRLite with the half wave wire extended vertically to a support pole.

Start the WSPR Beacons simultaneously on even minute at 20% duty cycle
Run the beacons for at least an hour.
The WSPR system of receivers will establish the relative SNR delta between the two antennas. 

Phase 2 Launch

Setup the WSPRlite beacons for full duty cycle
Start both beacons at an even minute.
Setup the rocket on the launch pad with the antenna draped loosely on the ground
Launch the rocket about 10 seconds prior to an even minute.
The WSPR system of receivers will establish the relative SNR delta between the two antennas.

Post Launch

Capture the data from the WSPR database. See if the SNR delta between the two beacons is greater at altitude than during the ground calibration.

I checked out of the gear at my home the day before the launch. Here is a video

At the launch, I ran a comparison of the rocket's beacon callsign N4KGL to a Bravo 7K vertical callsign W4RYZ on the field. The comparison report is at this link. Then, I prepared the PML Arial Rocket with an Aerotech I140 motor. The WSPRLite, a USB power supply, and a LNR Trail Friendly End Fed matchbox were in the payload. A 32-foot wire attached to the matchbox extended through a hole in the side of the payload bay.

The PML Arial Rocket on the pad ready to launch

Notice the antenna wire extending out of the payload bay.
The WSPR beacons transmit on a two-minute cycle starting on even minutes. I usually set the beacons for a duty cycle of 20 percent. If you start two beacons at the same time they will be synchronized. I thought I could set the duty cycle to 100 percent. That was not the case. 50 percent is the max.

With a 50 percent duty cycle, I could not predict exactly when a transmit cycle would start. There seems to be some randomness at play. That made pushing the launch button at the right time a bit difficult. So we waited until an even minute came to hear the beacon tone start on my KX2. John Hansel, the Launch Control Office pressed the button with perfect timing.  The rocket assent and decent under parachute were, fortunately, only slightly short of two minutes. The rocket landed safely on the field. The comparison report for the flight is at this link.

The Rocket Beacon N4KGL was -1.76 dB relative to the reference Bravo 7K vertical W4RYZ on the pre-flight ground comparison. The Rocket Beacon, N4KGL, was +1.8 dB relative to the reference Bravo 7K vertical, W4RYZ, during the flight. Therefore the flight beacon was +3.56 dB on average in the air than on the ground. Standard deviations are noted in the report. It is worth reviewing all the details in the reports for the complete picture. I can at least say the trend of the data shows there is an advantage in elevating the beacon/antenna. I believe the rocket altitude was at least 1500 feet or up to 2000 feet. There was no altimeter was on board.

I have had experience doing antenna comparisons during my study of the saltwater effect for vertically polarized antennas. I export the spots data from the SotaBeams website.  Then, I import it into a Microsoft Access database.  I developed the Spots Database to do the calculations and generate reports. The output is very similar and agrees with the results Dxplorer,net provides. However, those results eventually slip out of the time windows that the website uses. I can filter specific time periods for comparisons.

I enjoy getting empirical data in these experiments to examine what I understand about antennas and propagation. This experiment was mostly for the fun of it. I may try kites or balloons to elevate a WSPR beacon in the future. WSPRlite is exceptionally easy to use. It is reliable even in near space. All this is a good exercise for my interest in rockets, radios and relational databases. Thanks for reading!

Suzy had a great time greeting the fliers and spectators at the launch.

Monday, November 27, 2017

Success with the New AO-91 FM Satellite

AO-91 is a new FM s amateur satellite. It was known as Fox-1B before launch. It motivated myself and several Club members including Jim K4LIX and Bob KK4DIV to give it a try. It had been a while since I had the gear together to do an FM satellite. I started with the Kenwood TH-D72A and programmed the AO-91 frequencies in the rig memories. It had been long enough that I had to rediscover that the programming cable for the D72A is just a USB cable.

Greg N4KGL's photo by Phil N4STC
My first attempt was Saturday at the field behind the Panama City ARC Clubhouse. My antenna was the Elk log periodic. The bird was very crowded. I came up with nothing. I did hear Matt NJ4Y very well. Immediately after AO-91, AO-85 came over, and I got a couple including Bob KE4AL my friend in Dothan, Alabama. So my gear was working. I later emailed Matt, NJ4Y. He said that he was using a bit more than HT power and he recommended that for the busy day passes. He also suggested trying one of those middle of the night passes. I did an AO-91 pass at 2 AM Sunday morning with the Kenwood TH-D72A. It was very different due to fewer hams trying to use the bird. It sounded crystal clear just like a local repeater. I got three contacts.

I planned to met Bob KK4DIV at Kinsaul Park in Lynn Haven, Florida for a Sunday A0-91 day pass. In preparation, I gathered my Yaesu FT 8900 and programmed it. That would give me more power than an HT. I joined Bob and Phil N4STC at the park. The weather was excellent. The A0-91 pass yielded two contacts including Matt NJ4Y at EL98.

Another one of Bob KK4DIV's cool videos. Notice Suzy in the background at the park.

So I have now been checked out on the FM birds again. There will be more opportunities with another bird in the sky thanks to AMSAT. Bob and Phil and I discussed setting up a base satellite station as a club project. None of us have a home station or experience with a satellite tracking antenna. I expect that Chris VA3ECO, another one of my satellite Elmers, can help. He is expected to arrive in Panama City early January. He has a satellite station up in Ontario.

Note the Kenwood TH-D72A and the Yaesu FT 8900 are capable of full duplex on satellites. Bob is using the Yaesu FT 7900. When you hear yourself on the downlink you know you go through. Phil N4STC was using an HT to copy us. The downlink is on two meters so you do not have to worry about Doppler.

Friday, November 24, 2017

Portable Activation Guide: Join Us or Chase Us

I got inspired to create an online Portable Activation Guide for sites nearby Panama City Florida. Click on this link or the image.

This Portable Activation Guide is an aid to local and visiting hams in the Panama City, Florida area. Use it to choose a site and an activation program for your outing. We are blessed with many beautiful sites nearby. Some are on the saltwater gulf or bay which can enhance radio propagation. Our weather allows activations year round.