HF/VHF Portable Mini Tuner

By Guy, de ON6MU

Schematic fig1

Parts list

• alu box of 70mm X 40mm X 33mm

• 2 female PL 259 chassis

• C1 = variable capacitor of 300 or better 500 pF

• S1 = 10 or more posistion rotary switch

• L1 = 0,7mm insulated copper wire, 6 turns par connection closely together, 9mm outside diameter (8mm inside)
  taps every 6 turns and the last two sections (L1' and L1'') 4 turns spaced at 1mm and 3turns spaced by 2 mm

The coil

• Wind 6 turns x - 2 connections on your switch (in this project a 10-posistion rotary switch is used, being 8 times 6 = 48 + 4 + 3 = 55 turns) over a 7mm screwdriver (or simular obkject hi) and make a tap every connection. Solder each tap.

• Solder each tap to each connection of your switch and stretch L1' (being 4 turns) at 1mm spacing and L1''(being only 3 turns) at 2 mm spacing. You can replace L1'' by 3 turns of silver wire to allow better Q on higher frequencies (VHF).

• Minituner insides...

Specifications

• 2 set manual operation

• frequency range: 160m...6m (2m band if L1'' is silver, High Q switch, coil and close connections are used)

• 10 Watt +-

• direct feed

• compact design ideal for low power transceivers, like the Yaesu FT-817...

Homemade aluminum box

Don't forget to check these out:
.ON6MU Homebrew projects
.Radioamateur related projects

.ON6MU Ham mods
.Modifications of transceivers


73"

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