KARC Field Day Tuner Project
For the 2010 Field Day, KARC decided to add 10 and 15 meter antennas to the half-wave verticals we had for 20 and 40 meters. The FD
site layout was designed to have antennas for CW and Phone operation on the same band. The antennas were separated so simutaneous
operation on the same band was possible, with no interferece bewtween CW and Phone stations. FD 2010 plans call for two sets of
antennas for 10, 15, 20 and 40 - a total of 8 antennas. Members had enough high impedance tuners to support four antennas,
but we needed a total of eight. Thus was born the 2010 FD Tuner project.
Martin, KH6MB, agreed to handle procurement and asembly of the tuners. A BOM was generated, procurement started and completed
by mid-April and assmembly is in process. Below is a collection of information about the onging project. We'll report
on status and results right thru Field Day. (To display a section of interest, click on the + sign to display the information.)
Bill Of Materials
The rotor shaft of the capacitor should attach to the 50 Ohm side. This keeps the high voltage away from
your hand while tuning. Keep about 2 inches spacing between the inductor and the capacitor. The red wire and
the brown wire from the inductor to the ground connection on the coax connector are #12 or #10 gage wire.
This is where all the current is. The blue wire is #16 gaga. One goes to the antenna the other to the ground mat.
These are low current lines. Note the orientation of the inductor; wider spacing wire turns towards back of unit.
|P/N||Description||Qty||Cost per Kit||Vendor||Contact||Manufacturer||Notes|
|NBA-10142||Box, Enclosure||1||$47.43||$1.90||Newark||1.800.463.9275||Bud Industries||Cost for qty 4+|
|RI-20||Inductor 0.1 - 20.0 µH||1||$75.00 ||$11.00||Palstarfirstname.lastname@example.org||Palstar||Quote via email|
|C440||Capacitor 5.5 - 83 pF||1||$45.00 ||Palstaremail@example.com||Palstar||Quote via email|
|Acrylic sheets||Plastic base plate 6″ × 10″ × 3/16″||1||$7.70 || - ||Min Plastic & Supply||1-808-847-1511||Min Plastic & Supply|| |
|Plastic Rod||Insulating Rod ¼″ diameter × 2″||2||$0.68 || |
|(KNB) 27 ||Dial, ¼″ diameter bore||1||$5.00||$0.78 ||Surplus Sales||1-402-346-4750||Surplus Sales|| |
|(KNB) 44 ||Dial, ¼″ diameter bore||1||$5.25||$0.78 ||Surplus Sales||1-402-346-4750||Surplus Sales|| |
|ARF1005-ND||SO-239/U UHF Female Connector||1||$5.38||$0.98||Digikey||1-800-344-4539||Amphenol||Cost for qty 10+|
|H724-ND||Nuts 4-40||4||$0.54||B&F Fastener Supply||Stainless Steel|
|H735-ND||Split Lock Washers 6-32||4||$0.41|
|H782-ND||Pan head Screws 4-40 × 3/8″||4||$0.59||Lead free|
|H713-ND||Pan head Screws 6-32 × 3/4″||10||$0.71|
|H730-ND||Split Lock Washers 6-32||10||$0.26|
| ||Wing Nut 6-32||2||$0.55||$0.86||Local Hardware Store|| || ||Stainless Steel|
| ||Solder Spade Lugs ||6||$0.67|| || ||$6.00 Package|
| ||Hook up Wire||AR||$0.34|| || ||$3.00 roll|
|Total Costs (qty extended) >> ||$196.27||$16.30|| Total is $212.57 vs. budget of $225.00 ea.|
|KARC Club||Club Treasurer||$900.00||Check #413||03/13/2010||$900.00|| |
|KH6MD||Al Mariani||$225.00||Cash||03/13/2010||$1125,00|| |
|KH6QJ||Ken Taylor||$450.00||Check 563||03/13/2010||$1575.00|| |
|AH6PT||Al Kaopuiki||$225.00||Check 4432||03/13/2010||$1800.00|| |
|KH6MB||Martin Barr||($100.00)||Cash||03/13/2010||$1700.00||Cash to Martin to purchase hardware|
|N4EO ||Jerry Brown||$225.00||Check 6189||03/16/2010||$1925.00|| |
|AH6S ||Tiff Lawyer||$60.00||6189 ||03/15/2010||$1985.00||Only Palstar tuning capacitor 5.5 - 83 pf|
|Surplus Sales||($31.00)||Visa Charge ||03/18/2010||$1954.00||Shipped 03/18/2010|
|Newark||($443.97)||Visa Charge ||03/18/2010||$1454.06||Shipped 03/19/2010|
|MinPlastics||($75.42)||Visa Charge ||03/19/2010||$1378.81||Purchased 03/19/2010|
|Surplus Sales||($75.25)||Visa Charge ||03/25/2010||$1378.81||Shipped 03/25/2010|
|Palstar||($1223.98)||Visa Charge ||04/01/2010||$1378.81||Shipped 03/25/2010|
|Balance > ||135.37|| Martin has not been reimbursed for parts that exceeded his $100 advannce.|
Parts for all nine kits, including assembly hardware, have been inspected and stored together in their boxes at KH6MB's QTH.
The purchase of a drill bit for the assembly processing is pending. Final accounting will be presented at the May 2010 club meeting.
Unused funds we be will returned to the KARC Treasury.