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Youkits MT1 QRP Long Wire Antenna Tuner
MT1 is designed for the high-impedance long wire antenna, which can be used in the range of
10m to 40m, with the power handling of about 10W ( power handling peak is about 20W),
consisting of two parts, namely LC matching circuit and the VSWR power detection circuit .
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Table of Contents
Summary of Contents for YouKits MT1 QRP
- Page 1 Youkits MT1 QRP Long Wire Antenna Tuner MT1 is designed for the high-impedance long wire antenna, which can be used in the range of 10m to 40m, with the power handling of about 10W ( power handling peak is about 20W),...
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Page 2: Parts List
Parts List Amount Specification A YKT-02 circuit board 3.3K carbon film resistor Ω carbon film resistor R3、R4 4.7K carbon film resistor D1、D2 1N60 diode 30P tunable capacitor 100P monolithic capacitor C3、C4 104 ceramic capacitor 223P dual capacitor 2*2 toggle switch 1*12 band switch Meter 500uA meter... - Page 3 Production Production of T1 Cut the yellow and the red 28 # enamel insulated wire each for about 20cm long, which are winded on FT37-43 magnet ring for ten loops after being twisted together. Twist both end of the red and the yellow wire together as an intermediate tap. Production of L1 Cut the red 24 #enameled insulated wire about 1m long, and wind on T68-2 magnet ring, then tap for every three loops, totaled12 taps, with 10 tapped ones and the top the end leads.
- Page 4 The 1-12 feet of band switch S2 should be bended outward, in that case magnet ring L1 can be put within .Solder foot A with the 30mm 24 # enameled insulated wire. Put the winded magnet ring L1 on the S2, and connect the top and the end part of the winded wire on foot 1and foot 2 of S2 respectively, then connect other 10 taps with 2-11 feet.
- Page 5 Installing and welding D1-D2。 Installing and welding C1-C4。 Installing and welding The intermediate tap of T1 should be welded in the bonding pad next to R1 Cut the 24 # enameled insulated wire for about 30mm long, with one end through T1 and welded on the pad under C1.
- Page 6 Install the chassis 。 Install the BNC seat and two binding posts in the corresponding position on the cabinet.. Fix the header and PCB with screws.
- Page 7 The other end of wire passing through T1 is installed on the pedestal BNC, and pedestal BNC’s ground wielding piece is soldered on the ground wielding piece of PCB. The positive and negative terminals of the meter are connected to the + and – of PCB respectively. Install S2（L1）and C5 on the chassis.
- Page 8 The band switch S2 counterclockwise in the end, making the mark target exactly to A. Switch dual capacitor C5 counterclockwise in the end, making the mark target to 0, tighten the knob, and the installation is over. More attentions should be spent on these following points: Inductor finishing end of L1 must be welded to the 1 and 2 feet of band switch S2 .
- Page 9 Adjustment: The band switch S2 clockwise in the end (see the neutral place of above Figure, when L1 is through), duel capacitor C5 also clockwise in the end (in this case C5 is in the smallest capacity). Connect a 50 ohm, no less than 5 watts of power dummy load in the Wire and GND terminals, and tuneback S1 to SWR position.
- Page 10 Antenna is about 8 meters. GND us about 4.8 or 9.6 meters long. YouKits...
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