On the 16th of December 2017 John Frederick, N8GOU, will conduct a 4-hour hands on training session on the Basics of Using EZNEC Software. The session will be broken into these topic areas; general navigation, modeling a simple dipole, modeling a loop, modifications of an existing EZNEC file, creating SWR plots, and finally creating far field plots. After attending you should be able to use the software and begin to explore the more complicated uses of it.
Here’s a collection of all the notes I’ve gathered about the project, along with updated schematics:
The capacitors are all marked, but the text is 0.5mm high, so visors or magnifiers are needed to read them. LED lighting washes out so use incandescent when sorting. Visors are available around town, like Harbor Freight.
The little blue capacitors are all measured in picoFarads, and marked with 3 digits. The first two are significant digits and the third the number of zeros. For example: 271 = 270pF while 103 = 10000pF.
Resistor values can be verified by any ohmmeter (also available at Harbor Freight).
Varactor diodes D101 and D102 are reversed from what is shown on the board. I installed only one of them and it covered the entire 40m band with the potentiometer provided. I fully expect that the tuning will extend across the entire 40m band but resistors associated with tuning may need to be tweaked into the band.
If you have not applied the Q-dope to the toroid coils you can either stop by here (Jim’s shop) after they are wound, or make your own.
The blue resistors are 1% parts and are needed for the audio filter. Unlike the 5% (tan) resistors, they have an additional digit in the identification band. For example: 39.2 kOhm – Orange, White, Red, Red, Brown – 3 9 2 (00) 1% (the 2nd red = two zeros).
I recommend that you assemble the board in layers, starting with the lowest parts first.
Boards are through-hole plated, so you only need to solder on the back side.
Wire jumpers are placed across pins 1-2 on P6 P7 and P8.
See the PDF regarding the orientation of L102. The TAPPED winding terminal is near C105.
When the toroids are mounted and soldered, they need to be cemented down to eliminate vibration.
The orientation of SBL-1 MIXER is important. Pin 1 is denoted by a different color sealant (blue).
The ICs, U1 and U2 are marked by a dot or notch at the end where pin 1 resides. On the layout U1 and U2 show a notch.
The blue capacitor marked 4R7 is 4.7 pF and is a coupling capacitor in the oscillator circuit.
The rust colored capacitors are for bypassing and are marked 473 (0.047uF) and 104 (0.1uF).
When you are preparing to install your toroids, the copper wire is insulated. “Magnet wire” is copper wire with a thin coating of varnish on it for insulation. This is done so that you can maximize the number of turns in a small space (for magnetic coupling). The varnish gives the wire a darker color, some were even green. The coating must be removed before you can solder to the copper wire.
Simply heat up your iron (hotter) and apply solder to the tip and the wire. Slide the iron along the wire while applying some solder. Heat will darken and eventually cause the varnish to come off. You can also lightly scrape the wire to remove the varnish. In any case, be sure to tin the wire before inserting into the board for soldering. Having the solder on the wire makes it much easier.
Here is an update from Matt regarding WFD operations:
The meeting location for the rest of the year has been confirmed. Starting with the January program meeting on the 24th, all JARC meetings will take place in the Conference Room 2 at Mercy Hospital, 100 Mercy Way, Joplin, MO 64804.
Use the Northeast entrance:
Do not use the Emergency, Clinic, or Cancer Center entrances. The meeting room is on the 2nd floor. After entering the Hospital, take the elevator or stairs to Floor 2. Turn left toward the Gift Shop, and walk past it. On the right side just past the Gift Shop you will see the conference rooms. Here is a link to an interactive floor map of the facility: map.
Winter Field Day in 2017 will be January 28/29 from 1900 UTC to 1900 UTC. This year, we are planning on setting up an outdoor operation at the high school in Sarcoxie, MO (101 S 17th St, Sarcoxie, MO 64862). We will likely be at the football field or baseball diamond, look for the yellow sign, popup canopies, and long dipole strung up somewhere.
We invite all hams to come out and make a few contacts, hope to see you there!
So far, our meeting location for the January 2017 meetings will remain at the Red Cross building. There was a mention at the Holiday Dinner of possibly meeting at a conference room at Mercy Hospital, however we haven’t been able to solidify that reservation at this time.
Our recent project has been a direct conversion design and build, presented by John Frederick and Jim Scott. See below for the details on the project:
Joplin ARC will be setting up in the usual spot again this year – Dover Hill off North Main in Joplin. We will be running a couple HF stations, VHF, and a GOTA station so come out and Get On The Air!
We’ll be setting up Friday evening and Saturday morning, then running the entire duration of the event, overnight to Sunday. Dinner, Breakfast, and Lunch will be provided for operators, we have a tent to operate out of and you are welcome to bring a tent if you want to stay overnight also.
If you have an antenna or radio you want to bring out and try, let John Frederick know so we can coordinate it and put you in the schedule. We need to make sure we don’t have more than a certain number of stations on the air for our class at any given time.
If you have a certain time you definitely want to operate, also let John know so he can put you on the schedule.
BRING YOUR OWN CHAIR!
See below for the Field Day Schedule (times CDT):
- 24 June – Friday
- 1900 – 2100 – Antenna setup @ site
- 25 June – Saturday
- 0700 – Setup activity starts
- 1200 – Field Day operation “A” shift starts
- 1500 – FD OPR “B” shift starts
- 1800 – FD OPR “C” shift starts
- 1800 (approx) – Dinner for Field Day operators
- 2100 – FD OPR “D” shift starts
- 26 June – Sunday
- 0000 – FD OPR “E” shift starts
- 0300 – FD OPR “F” shift starts
- 0600 – FD OPR “G” shift starts
- 0730 – Breakfast for FD operators
- 0900 – FD OPR “H” shift starts
- 1130 – Lunch for FD operators
- 1200 – FD OPR “I” shift starts
- 1500 – FD Operations end, site tear down begins
- 1900 – Site tear down complete
Are you interested in taking a class to help you study for the Technician Class License Exam? Let us know by filing out the form on this page: Technician Class Survey
If there is enough interest, a class may be scheduled. Check this site for updates!