*** Club Meeting - Saturday March 2, 7:30 AM, Perkins, Olathe ***
This Months News
Jeff Darby - KE0CAZ
Well we are well on our way into 2019. Before you know it spring will be upon us. Now is a good time to clean up the shack and get rid of the old toys and projects you no longer use. It's a great way to make room for new toys.
Take some time this year and explore a new part of the hobby. Maybe you want to try a new mode or learn CW. Visiting some of the local Hamfests can give you a cheap jump start to any new equipment you might need as well as a venue to get rid of some of the stuff you no longer use.
After you have learned that new mode and have become a master, share you experience with the club. It's a good time to write an article for the newsletter or the Tech blog on the website. Remember these are two great tools available to everyone in the club. The more they are used the better they serve the club and the hobby.
The General class session is going well. The class is more that 1/2 way through the material for General class test. The end of the session will conclude with a testing session. All classes of testing will be available during the testing session. After the testing session hopefully we will have another handful of Hams that can enjoy the access to all the HF frequencies that come with a General class license
If you haven't yet, please look at paying your 2019 club dues. Payment can be made to Marty Peters. We are also asking you to log into the club website and validate your contact info
Marty Peters - KE0PEZ
MEETING TO ORDER:
The President, Jeff Darby KE0CAZ, called the meeting to order at 7:30 AM.
The Sec-Treasurer Report was given by Marty Peters KE0PEZ. He reported the checking account balance. The amounts of club revenue and disbursements since the January meeting were $880.00 and $538.27, respectively.
If you haven’t paid your dues for 2019, please do so immediately. Payment can be given to Marty at breakfast, during our club meeting, or sent to our post office box (SFTARC, P.O. Box 3144, Olathe, KS. 66063).
2019 Ham Classes [Larry Hall]
The ham class to prepare students for the General license continues to be an enthusiastic class. Weather has affected two classes, but the progress remains good.
Club Newsletter [G Wolfe – KI0KK]
Newsletter inputs are due by 7PM Wednesday, February 6th.
New Shirt Order [J Darby]
An order form was passed around for golf collared shirts T-shirts.
Club 501c7 process
Marty gave some details about the ongoing process of applying for reinstatement of the club tax-exempt status as a non-profit organization.
Del’s Edgerton Location
The 160m antenna drooped due to the ice storm, but it is back up and working well.
KS Day – Del
The special event was conducted on Saturday, January 26th, 2019, from 9AM-3PM. Four operators made 18 contacts. The club thanked Del for hosting the event.
Jim Andera reported on some things related to the trailer.
The solar panels have been mounted on top of the equipment trailer and produce about 170 mA under sunny conditions; an output of 500 mA is anticipated under the summer sun.
One of the two batteries stored in the trailer was dead, probably due to a bleeder resistor not being disconnected. Club members suggested several solutions to reduce or eliminate the current drain.
Joe Krout gave details of the Icom 7300 that is offered for sale at Associated Radio for $1099 and comes with a mail-in rebate offer of $100. The 7300 is direct conversion, same size as the 7200, and includes a built-in antenna tuner. Joe recommends purchasing a case to store the radio, such as a Pelican Case available at Harbour Freight. Members of the club discussed the radio and asked a number of questions about it.
There was a motion and a second to buy an Icom 7300 at Associated Radio and a Pelican case. President Jeff called a vote, and the motion passed unanimously.
Jim Andera asked if any club members were interested in participating in a Tallgrass Prairie operating event in mid-April. While overnight camping is prohibited, Jim suggested the possibility of operating throughout the night for those who just can't stop calling CQ. The event would enhance the public presence of our club.
After a motion, a second, and a unanimous vote, the meeting was adjourned.
George McCarville - WB0CNK
This article provides details on building a 6 Meter J-Pole antenna using PVC pipe for an enclosure.
Sketch 1 below, shows the basic electrical layout, which uses flat 450 ohm Window Line
for the tuning stub.
Sketch 2 below, shows the overall construction of the J-Pole antenna.
I used window line for the tuning stub, and a 3 wire cage portion above it to help broaden the frequency range. (I used spreaders made out of stiff wire to spread the 3 wires into a crude cage format).
For an enclosure, I used 1 Inch PVC pipe on the bottom (around the tuning stub portion), and ¾ Inch PVC pipe for the top (around the narrower cage portion). This helps reduce the wind profile and weight of the overall antenna. When joining the sections with PVC cement, I followed up with a hose clamp at the overlap joint to add strength. (My initial try without the clamp failed at the joint during a high wind (it split and folded the PVC over at the joint).
Many J-pole articles have you move or adjust the coax attachment point on the tuning stub for obtaining a low SWR. I instead soldered the coax in place, and then used the adjustable shorting bar method. Tuning by sliding a shorting bar(wire) to obtain a low SWR, then soldering it I think is a much easier method of tuning.
A Coax Choke is needed for this type of antenna to work properly.
I wound 9 turns of coax on a small ½ In mandrel, and held it together with tape, so that it would fit inside the bottom PVC. The coiled choke resides an inch or so below the feed point of the window line. (The tuning stub runs along side and below the choke.)
After assembling the window line tuning stub and the wire cage portions,I performed initial "ball-park" tuning before placing it in the PVC. Both the wire cage length, and location of the shorting bar are adjusted at this point. Remove a 2 Inch section of insulation from the window line starting approximately ½ inch below the feed point. Wrap the shorting bar wire around the tuning stub where the insulation was removed (a turn or two around each wire while maintaining the window line width), but don't it solder yet. Temporarily attach a SO-239 connector to the coax from the choke, and solder the other end of the choke to the tuning stub.
For tuning, first slide the tuning bar up and down 1/8 Inch at a time to obtain a low SWR anywhere on or near the band. To adjust to the desired frequency, fold back successive small 1 inch lengths of the top wire (or cage), leaving a loop each time for the fish line to connect to. (The excess wire will be trimmed later). Check and make additional adjustments to the shorting bar wire, as needed, to get a lowest SWR. When satisfied with the initial tuning, cut off the excess top wire(cage), and attach fish line to the cage top. With the the fish line threaded from the bottom of the PVC and out the top, pull the antenna in from the bottom of the PVC, leaving just the tuning bar wire exposed out side the bottom of the PVC.
At this point perform the final tuning. Small adjustments to the tuning bar wire, and top wire(cage) may be needed to compensate for the antenna being placed inside the PVC (mostly the wire cage length).
Once finally tuned, solder the location of the tuning bar wire, remove the previously attached SO-239, and pull the antenna entirely into the PVC, while guiding the loose end of the coax (where the SO-239 was temporarily attached) out the hole in the PVC.
(Pulling the choke and coax up from the bottom of the PVC, and then getting the coax connections out the hole in the PVC for the SO-239 connector, can be a bit of a challenge.)
Permanently solder the SO-239.
The feed point (about 2 Feet up from the bottom of the PVC), is where the SO-239 is mounted from the outside with several screws.
After connecting the PL-259 and feed line coax, I sealed everything, including the square base of the SO-239 (where it is attached to the PVC), as well as the PL-259 and feed line with Coax Seal.
I mounted the antenna using several U-shaped 1 inch EMT Conduit hangers, attached to the open 2 Ft of PVC pipe bottom.
Club Contact Information
Direct articles and comments to Newsletter Editor Greg Wolfe at:
Contact information is on our web site:
(view it on-line)
Calendar of EventsCalendar of event is on our web site:
(view it on-line)