Sunday, February 22, 2015

End of an Era


The videos near the end of this post highlight the end of an era. An era that not a lot of people know about. The AN/FLR-9 or Elephant Cage (called that due to its size) is a HF Rombic Antenna that was used exclusively by the Electronic Security Command (what it was called when I served) in its mission to provide national and tactical level Signals Intelligence or SIGINT. Also, during my time, the antenna was coupled to the R-390 receivers and later the RACALs. Before my time the R-388 was the mainstay receiver and I have one in service in my shack that I use very often. 



The antenna array is composed of three concentric rings of antenna elements. Each ring of elements receives RF signals for an assigned portion of the 1.5 to 30-MHz radio spectrum. The outer ring normally covers the 2 to 6-MHz range (band A), but also provides reduced coverage down to 1.5 MHz. The center ring covers the 6 to 18-MHz range (band B) and the inner ring covers the 18 to 30-MHz range (band C). Band A contains 48 sleeve monopole elements spaced 78.4 feet apart (7.5 degrees). Band B contains 96 sleeve monopole elements spaced 37.5 feet (11.43 m) apart (3.75 degrees). Band C contains 48 antenna elements mounted on wooden structures placed in a circle around the central building. Bands A and B elements are vertically polarized. Band C elements consist of two horizontally polarized dipole antenna subelements electrically tied together, and positioned one above the other."

The array is centered on a ground screen 1,443 feet in diameter. The arrangement permits accurate direction finding of signals from up to 4000 nautical miles away.

FLR-9s were constructed at the following places:

Augsburg, Germany

Chicksands, UK

Clark AB, PI

Elmendorf, Alaska

Karamursel, Turkey

Udon, Thani Province, Thailand

Misawa AB, Japan

San Vito, Italy

The dismantling of the FLR-9 at Misawa is on-going and due to be completed this year (2015). The last AN/FLR-9 in existence is at Elmendorf AFB Alaska. 






Enough distractions, I need to complete a couple of End Fed HF antenna designs for portable use.

72
Frank
K0JQZ

Saturday, February 21, 2015

TI9/3Z9DX in the log

I worked V31AT on 10 meters and a few minutes later I got TI9/3Z9DX on 12 meters. It took me two calls for V31AT and just one for the Cocos Island DX expedition which surprised me due to the mild pileup. I was using 5 watts to a dipole up about 20 feet but I had an unfair advantage over all the other callers. I installed and was using the second receiver in the K3 and it was super easy to find his listening freq. 
Confirming my callsign in the on-line logbook for TI9/3Z9DX




Unrelated video


The United States Air Force Thunderbirds



United States Air Force. Second to None.

Monday, February 16, 2015

Snow on Presidents Day

Lynn and I both had off for Presidents Day but the weather pretty much kept us inside. On Friday I was able to install Lynn's new 2 meter in her car (IC-880) and today I bought a RJ45 female to female connector and 3 feet of ethernet cable to finish that installation. I still need to clean up the wires a bit but it is installed and working.

I also installed the second receiver in the K3 but today was the first time I played with it. I think this was one of the best upgrades I did. I love listening to both receivers t the same time.

With the weather today I wanted to re-package a few projects that I have been working on. First up was the NEScaf which is a Switched Capacitive Audio Filter. I bought this specifically for use with the HW-7 and now the HW-8 in the field. I noticed on the NEScaf link that they are out of this kit. It is really a cool kit and works very well.

I found the tin at REI, I was going to mount the battery on the inside because there is enough room but decided to put a power jack on the outside making it easier to change out when needed.

NEScaf Filter
This repackage went fairly quickly since there was a lot of room to work with. Mister Mann decided he would rather play in the dirt than help me.

Mister Mann checking the underside of the deck
Next up was the Rockmite 30 Meter transceiver. I had this mounted in an Altoids Tin but wanted to do a cleaner job and also wanted to use the unique tin I picked up while on a SOTA activation in Estes Park Colorado.
30 meter Rockmite II
I like the Rockmites because they are simple and can go together in an afternoon. Great kits to learn on or just have fun with. Our baby cat Maura decided it was better to watch "cat TV" or look out the window than help with this one. She did check in on me in between naps.

Maura
The final one was the 200Hz HighPerMite audio filter. I really like this one offered by the 4 State QRP Group. Fun and easy to build and very practical with the Rockmites.


inside
I think the next one will be the 3 band Steve Weber designed MTR. While the case that came with it is compact and strong there is just something about doing you own enclosure. I found a tin that is slightly bigger than a Altoids Tin that will be a perfect fit. I am not sure if I will do this one as I may sell off this radio. I just do not use it at all and actually bought it for someone else that does not want it.


Our older cat is in her 20th year and was wondering where her Dental Mints went to.

Mayv
I do have one of the early Rockmite cases and really like it. It holds my 20 meter Rockmite and is the one I used for the Rockmite Challenge in 2013 on Mount Herman. It really was a lot of fun to run a pileup putting out 200 milliwatts to a simple wire antenna. Here is a picture of the 20 meter Rockmite along with my favorite QRP SOTA radio, the Steve Weber designed MTR dual band (30 and 20 meters).

20 Meter Rockmite on the left and 20/30 Meter MTR on the right
Of note Lynn and I did a drive up SOTA activation on Valentines Day on 10808 near Victor Colorado. We got a cabin where we got married at (near that area) and had an enjoyable time relaxing. It was nice to get out in 4 feet of snow and work the SSB and CW pileups with Lynn's KX3.



72, Frank, K0JQZ

Monday, February 9, 2015

K1N is in the Log!

Finally, after a week of trying to get K1N and jumping into the madness I was finally able to get them. I was listening off and on all day and I could hear K1N on 40 meters fairly well in the evening and tried for at least an hour straight to get them. Even with the P3 I could never really locate their listening freq.  This was frustrating and the pileup was tremendous, the worse I have ever heard.

There were a lot of people calling on his transmit freq but I bet most people did not realize they where not split. I am guilty of this as well from time to time when I had a Ten Tec Omni 6 and it was very embarrassing when it happened. With the K3 and P3 those guessing days are gone and I now actually prefer to work DX split. It gives my 5 watts an advantage.

I noticed a spot that had K1N on 20 meters and I went there and the pileup was just starting. I easily found their listening freq, put out my call and they came back after my first call. I looked over at Mister Mann and he did not seem very impressed. I was ecstatic!

Mister Mann was not impressed and wanted more cat nip

K0JQZ is in the K1N Log!
I was using 5 watts to a Dipole no more than 20 feet high. This was an example of luck over skill but I will take it.

72
Frank
K0JQZ


Sunday, February 8, 2015

Freeze Your Buns Off (FYBO) or not

This years FYBO Operating event is history and it was epic. Steve, WG0AT, and I operated from Signal Hill (non-SOTA summit) on Steve's property.

I did not know about the team rule that had to be mailed in prior and it is not important as this was a non competitive event for Steve and I. We tried many different radios all in the name of fun.

Our first order of business was to move a picnic table from Steve's deck over to the hill and setup the antenna. The antenna played well on all bands we used. The first radio was the KX3 and PX3 powered by a GoalZero Sherpa 50 charged by a solar panel. The Sherpa 50 does not provide enough power to run the KX3 at the full 10 or 12 watts but it did run it at 5 watts most of the day. This coupled with the RF hash the solar system produces makes it something I cannot recommend.

KX3 and PX3
Solar Panel

Sherpa 50 providing power

We also used a Steve Weber, KD1JV, designed ATS4 and finally another Steve Weber radio called the MTR or Mountain Topping Radio.


Steve Weber (KD1JV Designed ATS4b) (80, 40, 30, 20 and 15 Meters)


The two band MTR

Close up of the MTR

WG0AT Goat Paddles

After a while my XYL Lynn, KC0YQF, showed up with lunch and after we visited with Peanut and Boo and walked around Steve's property scouting locations for Field Day.

This was a different thing for us by not being on a mountain top and having full access to cables, tools, drink etc. I liked it.

Here is a break down of my entry:

K0JQZ
Team: None
Field: Yes
Category: Single Op
Alternative Power: Yes, Solar
Lowest Temperature: 55 Degrees (Feb in Colorado, you have to love it)
QRPp: No - 5 Watts
SCORE: 2496

BAND   QSOs   SPCs   NQ7RP
15             2          2           0
20             9          8           0
30             2          2           0

TOTAL:  13       12        0

Score = (13 X 12) (X2 Temp Factor) (X4 Field Factor) (X2 Alt Pwr) = 2496


Mount Herman looms to the West of us
K0JQZ looking for QSOs (photo by wG0AT)
This is a fun event and I think everyone we talked too had a lower temperature than we did. Amazing!

72
Frank
K0JQZ

Sunday, February 1, 2015

End Fed Tuner

I finished this a while ago but have not had a chance to see if it works until now. It is based off of the design on the SOTABeams Web Site. In fact I purchased one of the SOTA Beams tuners as a gift for someone and took the opportunity to take a look see and it is very well constructed. The only thing I would do different is to attach the coax and make the container smaller but the SOTA Beams case is very functional and designed that way for a reason, outlined on their website. So if you do not want to build one you can always buy one from SOTA Beams.

Here is the schematic:



For the case I used a plastic mint case. You can make one much smaller but I liked having the extra room. I ran the RG-174 into the case and tied it into a knot so it could not come out or put stress on the components. Unfortunately I did not take a picture of the inside of the finished product before I sealed it up.

The wire lengths are as follows:
40 Meter is 66.6 feet
30 Meter is 46.6
20 Meter is 33.2
17 Meter is 25.9

I had to adjust the coil turns to get it on 17 meters but it works fine. I am using about 6 feet for a counterpoise but was able to tune it fine without the counterpoise save 17 meters. The antenna wire is number 26 teflon coated slippery stuff linked together with connectors I picked up from Hobby King a long time ago. Any type of an electrical connector will work fine.

Tuner and Counterpoise
40 through 17 Meters (this is so I will remember when on a summit)
Complete antenna/tuner/coax weighing in at 5.6 oz
For my first use I used my ATS4b transceiver on Mount Herman (a SOTA summit).

ATS4b

tuner connected to the antenna and counterpoise

antenna going into a tree
You cannot see the antenna but the Old Snag center frame is where the other end is connected

My friend wG0AT operating, you can see the tuner to the right, hanging down
This was a fun little project and the tuner is functional and practical. Plus if you do not want to build one it is offered from SOTA Beams complete and in a neat container weighing almost nothing.  Unfortunatley my ATS4b has 15 meters vice 17 meters so it is not a good match for that radio.

Video: