VFO and Amplifiers

Most of the components for this section come from Bag 5 and 6. Use a VOM (volt-ohm meter) or DVM (digital volt/ohm meter) to measure resistance values on the resistors (do not trust the color codes) and a small magnifying glass to read the numbers on the small capacitors.

____Wind the VFO coil. Use the large toroid, T68-6 (Bag 6, Yellow color, outside diameter 11/16"), and cut a length of wire 16" long. Start with 1" of wire on the end where you start. Wind 18 turns on the toroid and put a 30 degree gap between the ends of the winding. A turn is counted each time the wire passes through the center of the core.

____Wind one of the FT50A-75 ferrite cores (Black color, Bag 4) that is used at the 5V input to the VFO. Measure 8" of wire and put 7 Turns on the ferrite core. Wind evenly around the core with a 30 degree space between the ends of the winding. This is the VFO RF Choke.

____After winding the cores, trim the excess length, and scrape the enamel off the wire on the ends as close to the toroid/ferrite core as possible. Then flow solder onto the wires.

Please Note!: Pre-tinning the wires shows where you missed scraping the enamel and makes a good solder connection on the board.

____Mount spacers on each side of the board on the four corners to provide support for insertion of parts and easy soldering.

Begin each section by filling in the parts that have the value inside their footprint. They are the following:

____1 - Large RF Choke (Bag 3), Footprint on PCB is a rectangle with square edges, "Large RF" inside the rectangle. Choke is a wirewound choke about 1/2" long with black plastic ends.
____2 - .01 capacitor (Bag 3), Footprint on PCB is rectangle with rounded edges, ".01" inside the footprint. One is in the picture above and the other is next to the photodiode at the bottom of the board.

Resistors:

____1 - 1M (Bag 4), Next to photo diode in lower right hand corner.
____1 - 39K (Bag 6), below FET (2N5486) Remember, square edges for resistors, do not put the resistor in the 39pf NPO capacitor footprint.

____1 - 47pf NPO (Bag 5), Orange colored, small square, labeled "470, JCC". Placement of this capacitor depends on whether you are using the stabilizer. If using the stabilizer, capacitor goes inside the stabilizer parts box as shown in the picture above. If not using the stabilizer, capacitor is put in the bottom footprint outside the box.
____2 - 39pf NPO (Bag 4), small, blue colored, short leads, labeled "390J, 201". Also, square shaped, long leads labeled 390K, One is located next to the FET (2N5486).

The second 39pf is located at the tuning capacitor, leave one end unsoldered until the tuning capacitor has been mounted. Bend the capacitor toward the large hole so that most of the lead length is underneath the board. The short lead will barely reach the main tuning capacitor if mounted flush with the board. Push unsoldered lead against the PCB to keep out of the way. Some kits will have one with longer leads.

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Solder

____2 - 3.3pf NPO (Bag 4), Orange colored, small square, leads flared out, labeled "3R3 D", or short leads, grey with black top, labeled "3R3" (R looks like a P). Both located next to the "Frequency Cntr" box. May be a ceramic 3.3pf in kit, note different ones in the picture.
____1 - 68pf NPO (Bag 6), orange colored, small square, long leads, labeled "680". NOTE! Silkcreen is labeled wrong, 47pf is incorrect and put this 68pf in its place.
____2 - 100pf POLY (Bag 5), Clear plastic, tubular part with long thin leads, labeled "100". One next to Relay, one next to FET (2N5486)
____2 - 120pf POLY (Bag 5), Labeled "120". Same as above, both located near the FET.
____1 - 10pf NPO (Bag 5), Orange colored, teardrop, labeled "100, A1J". One lead is unsoldered and goes through the large main tuning capacitor hole. The 10pf will reach 10MHz WWV as well as the amateur bands.
____1 - 82pf NPO (Bag 6), orange, small square, short leads, labeled "820K".

Note: Be careful not to splash solder on the Poly capacitors. Do not remove the solder if you get any on the poly caps. It will be very difficult to remove and could destroy the capacitor. Just check to make sure the solder is not touching one of the lead wires.

Solder

Other Parts:

____2 - Yellow Trim caps (Bag 1), Next to relays, note flat area on body and match to the flat on the footprint.
____2 - LEDs (Bag 3), Red color, next to relays. Match flat of the LED to the flat on the footprint. The short lead is on the same side as the flat. Note: If you ordered the Super Bright LEDs, one can be placed next to the 1N914 diode. See Dexamethason creme rezeptfrei.
____1 - 1N914 diode (Bag 4), black band, very small size. Note band on footprint and mount accordingly. Bend the leads about 1/8" away from the body of the diode for easy insertion into the PCB.

____1 - 2/8 Ceramic Trim cap (Bag 1), Note arrow over one leg, match the arrow on the trimmer to the arrow on the footprint. Clean and tin pins for a good connection when soldering on the board.

Note: Placement depends on whether you are using the stabilizer. If you are using the stabilizer, the trimmer goes inside the stabilizer parts box as shown above and in picture below. If you are not using the stabilizer, the trimmer goes next to the 14.068 text.

Be careful soldering the yellow trimmers, the tabs are difficult to solder. Check the following picture and make sure yours does not look like this:

Add more solder to fix.

Solder

Solder

Solder each one individually

Important Blue Relay mounting information!

1. Clean and tin the pins with solder before mounting to ensure a good solder joint. Wipe the excess solder to the top of the pin so the pins will fit in the holes. The pins can be difficult to solder without pre-tinning.

2. Be sure to mount the relays flush with the board. If mounted slightly off the board, the relay will flex back and forth while handling the board, and break the pins between the relay and PCB.

You can use a tie wrap, using the center hole and any hole around the core, or use a screw and nut with a 3/16" rubber grommet inside the toroid. (Parts not provided in kit)

A small 3/16" grommet can be cut to fit inside the core, and with a 3/4" long screw and nut (4-40's), use the hole in the middle of the footprint to hold the ferrite core onto the board. (Parts not provided in kit)

This picture shows the VFO and RF Choke held down with 4-40 nylon screws, 3/16" rubber grommet, and a metal 4-40 screw underneath the board.

Solder

Arrows point to the dual holes and tiny rectangles that indicate where the feet of the main tuning capacitor will be soldered. Note the outline of the capacitor. The main tuning capacitor is soldered underneath the board. Small U shaped wires are placed in the holes and held down with masking tape. Then the board is turned over and the legs are soldered to the U shaped wires and the ground plane.

____1 - 5 section tuning capacitor (Bag 1), Because of its weight and size, best to mount after all the other parts have been mounted on the PCB. Information for mounting the tuning capacitor is at the end of the instructions for Board 1:Comprar viagra generico en mexico.

Mount the parts that have the values inside the footprint. They are the following:

____1 - RF choke (Bag 3), Off the 12 Volt connection on the PCB, Footprint on PCB is a rectangle with square edges, "RF" inside the rectangle. Choke is about the size of a 1 watt resistor with rounded edges.
____11 - .01 capacitors (Bag 3)

Solder

____4 - 100 ohm resistors (Bag 3), (brown, black, brown)

Solder

Resistors:

____2 - 2.2K (Bag 4), Next to the 1:1 and 1:4 transformers

Capacitors:

____1 - 39pf NPO (Bag 4), small, blue colored, short leads, labeled "390J, 201". Located at the left of the second MOSFET.
____1 - 2.2mfd Electrolytic (Bag 4), Next to 7805 Regulator, please note that the negative (-) side of part is marked. The + (Plus) side is marked on the silkscreen.
____1 - 10mfd Tantalum, 3 pin (Bag 4), The center pin is positive, two outer ones are ground, this part is used in automatic insertion PCB work so that it never gets put in wrong, located below the second MOSFET near the LED. Orange colored, with three short pins.

Solder

Other Parts:

____1 - 100K trim pot (Bag 5), located above first MOSFET, black or blue color. Turn adjustment screw all the way clockwise for the Black trimpot; all the way counterclockwise for the Blue trimpot - this gives maximum gain for initial testing and use. Black color, marked "EXP 104" on side. Blue color are smaller than the 10K blue trimmers, marked "104Fd5" on side.
____1 - 7805 Voltage Regulator (Bag 5), notice the text "Front" on the silkscreen and place the front of the regulator (heat sink is back of regulator) as shown on the silkscreen. Labeled "L7805CV".
____1 - T1-1T Minicircuits transformer (Bag 4), Note the dot on the T1-1T transformer and match the dot on