WØUI HAM RADIO
ANTENNA ARRAYS IN USE AT WØUI
MOSLEY PRO-67-C-3 ANTENNA
Yagi for 40, 30, 20, 17, 15, 12, 10 meter ham bands
It is mounted on the 51-foot Tri-Ex WT-51 crank up tower and served by a Ham-IV rotator.
PENDING ANTENNA ACTIVITIES:
After three decades spanning two Log Periodics, now retired from US Army (DoD) MARS and
looking at the threats of a declining Solar Cycle 24 and predictions of a meager Solar Cycle 25,
To prepare for Solar Cycle 24's bottom and a possible poor performance by the next Solar Peak 25,
the primary goal was to add 40 and 30 meters onto the tower and not lose what the Log Periodic already provided (20, 17, 15, 12, and 10 meters).
Everyone has opinions and emotions on antenna issues.
During the analysis process, Woody attempted to consider factors
such as performance, construction and in-service support.
Other primary antennas considered included:
Optibeam OB15-7 15-element yagi/22-ft boom/25sqft load,
Steppir DB18E 3-element/19-ft boom/12.1sqft load,
M2 7&10-30LP8 8-element/30-ft boom/13sqft load
For various reasons these possibilities were eventually set aside.
The M2 7&10-30LP8 was a close second but, after reviewing available performance data, the Mosley won.
Some base their purchase decisions on appearances (they marry their spouses for the same reason).
For me, I looked at performance factors from which was my final purchase decision.
If you look at the Pro67c3 what you see is a three-element yagi for 40-meters plus smaller elements for the other bands.
Focus on the three-element yagi part and the other components begin to just blend in.
Some don't like traps.
That said, this antenna outperforms the Log and the traps will outlive me.
To all their own opinions. For me, no regrets.
The Mosley Pro67c-3 arrived by
Three of the four boxes showed signs of damage during shipment so we opened the damaged areas before signing acceptance of the antenna.
The truck driver worked with me to open and examine box contents for damage.
The antenna components were well packed within the boxes, however, and no signs of damage were observed.
TRI-EX WT-51 TOWER STATISTICS:
When fully extended to the highest 51-foot (15.5m) height, the tower was rated for:
9-sqft (.84m2) of antenna area at 50 mph (80kph)
5-sqft of antenna area at 70 mph
3-sqft of antenna area at 80 mph
Figure add-or-loss of 2-sqft per 10-mph
Dead Load rated at 150 pounds (68kg) max
The tower nests down to a 21-foot (6.4m) height and contains 417-pounds of steel
Additional information about the 51-foot Tri-Ex WT-51 crank-up tower.
During the transition from
the Log Periodic over to the Mosley Pro67c-3
I worked with the Tri-Ex tower manufacturer to update the aging steel crank-up cable as well as the thrust bearing.
My interface with the manufacturer owner was very pleasant.
I can highly recommend them as competent and caring professionals.
Tashjian Towers Corporation
2765 S. Temperance Ave., Fowler, Ca. 93625
Ham IV Rotator
A new Ham-IV rotator was purchased from Norm's Rotor Service and installed in 2012 to replace the former rotor.
Cutting of the rotor place was required.
GAP VOYAGER DX-4
Vertical for 160, 80, 40, 20 meter ham bands
Above: The GAP Voyager DX-4 45-foot (13.7 meter) tall vertical provides coverage on 160, 80, 40 and 20 meters.
for the 80 and 60 meter ham bands
Other Bazooka antennas for 160, 40 and 30 meters have been retired and sold.
Above: Planning for the new wire-antenna environment was obviously the first step.
The above photo was taken by Lorelei from the Cessna.
Below: The series of end supports for six wire-based antennas mounted to the Tri-Ex crank up tower.
Pullies on all three supports allow raising and lower (for maintenance, enhancements, adjustments, etc) from the ground.
Five "Double-Bazooka" antennas are in the lineup with one spare for experimentation or growth.
WIRE ANTENNA SUPPORT STRUCTURES
Woody set up this old 28-foot (nests down to 14-feet) crank-up tower for the dipole installation.
The John Deere 750 tractor made tower installation significantly easier.
It is the center support for Woody's 160, 80, 60, 40, and 30-meter Double Bazooka wire antennas
This is an Antenna Products (of Mineral Wells, Texas) MM-715 32-foot Telescopic Mast
This 26-pound mast unit nests down to about 6-feet and telescopes up to just over 32-feet.
Not overly strong, so far it has successfully withstood the high winds common to this 7000-foot (2133 meter) installation.
It supports the ends of the wire antennas.
When fully extended and properly guyed it is roughly rated as follows:
Installation is on a poured concrete pad with four concrete-embedded eyelets for
the guy wires.
The John Deere Gator aided in the installation effort.
AN MFJ-2013 60-and-30-meter OFF CENTER FED dipole
This antenna is available as a custom-order from MFJ.
It was installed without incident and seems to work pretty well on the two bands it was designed for.
AN MFJ-17758 80-and-40-meter TRAP
This dual band antenna works pretty well for the bands to which it was designed.
It will likely be retired to field day or Go-Kit status during the summer of 2015.
ANTENNAS IN THE ATTIC
AN MFJ-17758 80-and-40-meter TRAP DIPOLE IN THE ATTIC
As the residence is on a 7000-foot (2133-meter) ridge, high winds and lightning are not uncommon.
Outside arrays are disconnected and grounded when there is the slightest possibility of lightning.
To this end Woody installed an MFJ-17758 80-40 meter trap dipole in the attic.
That way, hamming can be done if outside antenna arrays are grounded due to any prediction of lightning storms.
While in-attic antennas are not as ideal as outside antennas, they do serve a purpose and certainly can perform fairly well.
There are no regrets for the installation of this array.
In the attic it does not hear very well compared to an ourdoor antenna but will have to do.
Above: The antenna laid out before installation.
Woody used black electrical tape on the "negative" side of center (above left)
and red electrical tape on the "hot" side of center (above right)
Above: From the local hardware store, an us$8.00 bag of nail-on electric fence standoffs made a great way to install the dipole.
The nails, made for a robust fencepost, were not driven all the way into the rafters due to the possibility of splitting the wood.
Support was provided for every on other stud
The antenna is installed on the side of the attic without the light power wires.
In the center is seen a 9-volt-battery powered smoke detector.
At this point, the ham antenna has not had any adverse affect on it (no false alarms).
Some 18-years ago I had lights installed in the attic.
This was a smart and recommended expense for general home maintenance.
Otherwise, you're going to be doing all of this with either flashlights or drop lights and extension cords (ugh).
Above: The dipole center was secured to a nail with some left over exterior antenna guy rope
Above: A hammer for the nails, a tape measure and a 5/16-inch nut-driver made the work pretty straightforward.
The instructions say to NOT actually cut any wires and
to tune the 40-meter (center to trap) section first.
Loosen the nut and shorten the overall length to raise the frequency.
USE OF AN ANTENNA ANALYZER IS A MUST
Since getting in and out of the attic to test tuning is a real pain,
an antenna analyzer the you can use in the attic at the center insulator is HIGHLY recommended.
IF you do not own one, check with your local ham radio club to see if you could borrow one.
CLICK TO SEE more on the MFJ-259 analyzer
WARNING WARNING WARNING
Watch your head when up there... shingle nails poking through the wood can draw some significant blood and be highly painful.
On the subject of pain, keep your head down as the wood hurts when you hit your head on the studs.
Always Always Always step only on the studs... DO NOT STEP BETWEEN THEM (onto the ceiling sheetrock).
Sheetrock is not made to support your weight.
You WILL fall right through into the room below, injuring yourself (or worse) and destroying the ceiling of that room.
Above: The dipole strung up high but offset from center a bit.
The two (now abandoned) television antennas did not have any impact on antenna performance.
85-FOOT DIPOLE INTO A 68-FOOT LONG ATTIC
Above: The dipole is 85-feet long but the ranch style house was only 70-feet long.
Since I didn't take it end-to-end (wall-to-wall) I had 68-feet to deal with.
The center insulator was placed near the 34-foot mark leaving 17-feet extra that had to be managed.
With (roughly) nine-feet-per-end left over, the ends were simply crossed over to the opposite side of the attic and brought back away from the end and downward.
The large furnace flue pipe at the end of the house nor the electrical wiring does not seem to have any impact on antenna performance.
A goal is that the wire of the antenna in no place ever directly touches any wood or other attic materials.
Above: Empty boxes and stored materials do not seem to influence antenna performance.
In this installation from the wire-feed-through-hold on the end-insulator to the shortening-clip (the adjustment section for 80-meters) was 21-inches.
As per the instructions, adjust the center-to-trap (40-meter) section for optimal SWR first and then to the 80-meter leg.
As a predominate CW-operator, Woody tweaked the antenna for this portion of the 80 and 40 meter bands.
Using his antenna tuner,
Woody was able to also tune nicely on 20, 17 and 15 meters (didn't try any higher bands)
The antenna is fed from the basement hamshack into the attic via RG-213u coax.
ANTENNAS NOW RETIRED
TENNADYNE T-10 EAGLE HF LOG PERIODIC ANTENNA
Yagi for 30, 20, 17, 15, 12, 10 meter ham bands
Tennadyne T10 Eagle log
periodic antenna array had
10-elements on a 24-foot (7.3 meter) boom and covers 13 to 30 mHz (and 10 mHz).
This antenna has performed well and stood undamaged even with some of the severe weather we get here at 7000-feet.
I actually hated to part with it and would recommend Tennadyne to anyone considering a Log Periodic antenna array.
Except for the interest to add 40 and 30 meters to the tower it would have never been retired.
It was mounted on the 51-foot Tri-Ex WT-51 crank up tower and served by a Ham-IV rotator.
The newer-style Tennadyne Model T10.10-30HD covers from 20-10 meters (13 to 30 mHz plus 10 mHz)
Below Left: Antennas in the summer's late evening gloaming - June 2013
Below Right: Fall arrives at WØUI - October 2013
This Tennadyne T10 Log Periodic was rated:
24-foot boom 46-pounds 10-sqft wind area
BELOW IS A TENNADYNE FLYER RECEIVED IN AUGUST, 1992
This sales literature had specifications in it.
The T5 was bought (see photos below) for use with US Army MARS during the first Gulf War.
Later I bought the T10 which I still have and use to this day.
The T5 was sold when I retired from Army MARS.
CLICK HERE for a PDF of the Tennadyne T10 Eagle log periodic antenna
recommended "Collins Balun."
It is about 3.1mb, please be patient for it to download.
TENNADYNE T-5 HAWK HF LOG PERIODIC ANTENNA
Yagi for 20, 17, 15, 12, 10 meter ham bands
Above: The Tennadyne T5 Hawk log periodic antenna boasted five elements on a 12-foot (3.7 meter) boom and covered 13 to 30 mHz.
I first installed this antenna in the early 1990's for Army MARS use during the original Gulf War.
It was a great antenna for In-The-City installations as five-elements on a 12-foot-boom
Overall it gave good performance on a fairly small lot and was not overly invasive to look at.
Tennadyne had originally replaced it with a six-element model (Tennadyne T-6)
but that one has now been replaced with a
Tennadyne T7 which boasts seven-elements on an 18-foot boom.
CLICK HERE for a PDF of my original
Tennadyne T5 Hawk log periodic antenna installation guide
- It also includes information on the recommended "Collins Balun."
It is about 10mb, please be patient for it to download.
WOODY'S OTHER ANTENNA ACTIVITIES:
Below: Working with the Colorado District 24 ARES organization, we worked to install to install amateur antennas on the Elbert County Sheriff's communications tower in Kiowa, Colorado. (Woody is the lower person on the tower)
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All personal comments, pictures copyright 1996-2015 - R. Linwood (4L RANCH)
Since 22 May, 2010