CVARS WA7UHD

CVARS
The Chehalis Valley
Amateur Radio Society
WA7UHD

ARRL special service club




Electronics Workshop - January 25, 2018

Time & Location:

Topics:
  1. Basic: Power Supplies
  2. Stretch: Fourier Transform
  3. New: HF Propagation Beacons
  4. New: Portland Stonehenge Tower
  5. Project: Triplexer/Band Pass Filters

Notes:


Reference:
Power Supplies:
  1. https://heilsound.com/amateur-radio-post/the-pine-board-project/
  2. “The ARRL Handbook for Radio Communications – 2018”
Fouries Transform:
  1. http://www.stem2.org/je/Excel_FFT_Instructions.pdf
  2. http://dougkerr.net/Pumpkin/articles/Excel_Fourier.pdf
HF Propagation Beacons:
  1. http://www.ncdxf.org/beacon/intro.html
Portland Stonehenge Tower:
  1. https://people.well.com/user/dmsml/stonehenge/
Triplexer/Band Pass Filters:
  1. “HF Yagi Triplexer Especially for ARRL Field Day,” Gary Gordon, K6KV, QST June 2010, pp. 37-40
  2. “The NVARC ‘Ugly’ Filter Project,” https://www.n1nc.org/Filters/
  3. “Clean Up Your Signals with Band Pass Filters,” E. Wetherhold, W3NQN, QST May 1998, pp. 44-51 and June 1998 pp. 39-42
  4. K7MEM Air-Core Inductor Design, http://www.k7mem.com/Ind_Coil_Design.html


Bandpass Filter Cases:  3⅜" x 5½" x 5⅞", 0.03" sheet metal thockness

10-Meter Bandpass Filter:  http://www.n1nc.org/Filters/10meter/,
    http://www.n1nc.org/Filters/10meter/Schematic,
    http://www.n1nc.org/Filters/10meter/Chassis.
Coil Form Coil
Coil # Pipe OD Length Wire Turns Coil Length Inductance
L1, L5 ½" Sched 40 PVC 0.840" 2" 36", #14 solid, insulated 1.00" 1.64 μH
L3 ½" Sched 40 PVC 0.840" 2" 36", #14 solid, insulated 9 1.00" 1.41 μH
L2, L4 Thin wall PVC 0.620" 1¼" 12", #14 solid, insulated 0.40" 0.23 μH

C1, C2, C3, C4, C5, C6 – 33 pf, 3 KV, Panasonic P/N ECC-A3F330JGE
  3 – 1¼", 4-40 brass machine screws
10 – ¼, 4-40 brass machine screws
19 – 4-40 brass nuts
  5 – 4-40 brass washers
  2 – ground lugs
  2 – SO-239 UHF jacks & mounting machine screws and nuts

15-Meter Bandpass Filter:  http://www.n1nc.org/Filters/15meter/,
    http://www.n1nc.org/Filters/15meter/Schematic,
    http://www.n1nc.org/Filters/15meter/Chassis,
    http://www.n1nc.org/Filters/Shield.
Coil Form Coil
Coil # Pipe OD Length Wire Turns Coil Length Inductance
L1, L2, L3 ¾" Sched 40 PVC 2" 54", #14 solid, insulated 11½ 1.10" 2.65 μH

C1, C5 – 2 x 12 pf, 3 KV, Panasonic P/N ECC-A3F120JGE in parallel (24 pf each)
C2, C4 – 2 x 100 pf, 1 KV, Panasonic P/N ECC-A3A101JGE and
    1 x 12 pf, 1 KV, Panasonic P/N ECC-A3A120JGE in parallel (212 pf each)
C3 – 1 x 12 pf, 3 KV, Panasonic P/N ECC-A3F120JGE and
    1 x 15 pf, 3 KV, Panasonic P/N ECC-A3F150JGE in parallel (27 pf total)
  3 – 1¼", 4-40 brass machine screws
16 – ¼", 4-40 brass machine screws
22 – 4-40 brass nuts
  5 – 4-40 brass washers
  2 – ground lugs
  2 – SO-239 UHF jacks & mounting machine screws and nuts

20-Meter Bandpass Filter:  http://www.n1nc.org/Filters/20meter/,
    http://www.n1nc.org/Filters/20meter/Schematic,
    http://www.n1nc.org/Filters/20meter/Chassis,
    http://www.n1nc.org/Filters/Shield.
Coil Form Coil
Coil # Pipe OD Length Wire Turns Coil Length Inductance
L1, L2, L3 ¾" Sched 40 PVC 2¼" 60", #14 solid, insulated 14 1.40" 3.17 μH

C1, C5 – 1 x 47 pf, 3 KV, Panasonic P/N ECC-A3F470JGE
C2, C4 – 2 x 150 pf, 1 KV, Panasonic P/N ECC-A3A151JGE and
    1 x 18 pf, 1 KV, Panasonic P/N ECC-A3A180JGE in parallel (318 pf each)
C3 – 1 x 22 pf, 3 KV, Panasonic P/N ECC-A3F220JGE and
    1 x 33 pf, 3 KV, Panasonic P/N ECC-A3F330JGE in parallel (55 pf total)
16 – ¼", 4-40 brass machine screws
22 – 4-40 brass nuts
  5 – 4-40 brass washers
  2 – ground lugs
  2 – SO-239 UHF jacks & mounting machine screws and nuts

Triplexer:  QST, June 2010, pg. 37-40.
Coil Form Coil
Coil # OD ID Length Wire Turns TPI Inductance
L1 (20M) 1" ¾" 2" #20 solid, insulated 19½ 17½ 8.0 μH
L2 (15M) 1" ¾" 2" #18 solid, insulated 13½ 13 5.3 μH
L3 (10M) 1" ¾" 2" #16 solid, insulated 12 11 4.0 μH

C1 – 16 pf, 2+ KV, variable capacitor (20M)
C2 – 11 pf, 2+ KV, variable capacitor (15M)
C3 –   8 pf, 2+ KV, variable capacitor (10M)
Example capacitor: RF Parts P/N 48APL30, 5 to 30 pF, 2 KV

  4 – SO-239 UHF jacks & mounting machine screws and nuts

 Return to the top of the page. 


Updated 07/12/2018.    Email webmaster.      Facebook Link