Circuit Details - Varicap Tuned Bandpass Filters
before building this section.
____4 - Blue Relays (Bag 4), Be very careful with the part as the pins are fragile. Do not bend the pins when mounting/soldering to the PCB. Orientation does not matter, inner pins are the coil, outer pins are the relay. 1. Clean and tin the pins with solder before mounting on board to ensure a good solder joint. 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. |
Solder one pin to the PCB, then hold the relay against the top side of the PCB and remelt the soldered pin to set the relay against the board. Then solder the other pins. |
____5 - 100K resistors (Bag 3) (brown, black, yellow) |
____6 - .01 capacitors (Bag 3) |
____4 - .1 caps (Bag 4) The "Lay flat on board" instruction on the board does not have to be done. Different .1's are used - small square labeled 8752T, J100V, 104K. |
____1 - 1N914 diode (Bag 4), Black band, be sure to match the band on the diode to the band on the footprint. |
____2 - MV2115 Varicap (Bag 5), Be sure to match the flat of the component to the flat on the footprint. Flat of part is colored light blue, marked "MV 2115". ____2 - MVAM115 Varicap (Bag 5), Be sure to match the flat of the component to the flat on the footprint. Marked MVAM 115 ____2 - LEDs (Bag 3), Blue LEDs, at the left side of the relays on the right. Match flat of the LED to the footprint. The short lead is on the same side as the flat. Note: Sometimes it is difficult to push the LED through the plated through hole, it is OK to let the LED sit a little higher on the flattened wider points on the leads. Solder one lead, straighten the LED, then solder the other lead. |
____2 - IREDs (Bag 4), Smoky colored, on a cardboard strip, do not cut the leads off the strip, tear the IREDs off the strip and clean the bottom of the leads. Mount as high as possible, then aim to the appropriate photo receiver. They are located to the right of the output relays on the left. |
____2 - .01 capacitors (Bag 3), ____2 - 1N914 diodes (Bag 4), Match black band to white band on footprint ____1 - SPDT slide switch (Bag 5) for Band Switch footprint. There are two hole patterns. Mount the switch in the holes that fit the switch in Bag 5. |
Install 100K Potentiometer____1 - 100K Panel Mount Potentiometer (Bag 6), The three holes labeled "Filter Tune" should accept the pins of the potentiometer supplied with the kit. |
Look at the following 4 pictures and instructions before installing the 100K pot.____2 - 1K resistors (Bag 3), One on either side of the 100K pot. |
Push Pot through holes. Using a needle nose pliers, run the wires through the holes of the connections. |
1. Bend down the connections of the pot to the bottom of the board. 2. Then bend the resistor wires over the connections to secure pot against the bottom of PCB. 3. The right connection will not go all the way to the board, it will be on top of the wire as it comes out of the board. 4. Lift up board to straighten pot vertically, recheck tightness of wires over the pot connections. |
Solder and clip the leads. |
40/30/20 Meter Bandpass Filter____4 - T50-6 Yellow cores( Bag 4), 35 Turns 5uHy |
Install 40/30/20 Coils and Aim the Photo DevicesThe 35 turn and 6 turn coils in the middle of the 40 to 20 meter Filter will have to be bent over to allow the Shrink Tubing to run between the Photo Devices on the board. Allow extra lead length when soldering so they can be bent over slightly. |
TV & FM Filter and RF AmplifierTo learn about the TV and FM Filters, read the Circuit Details - TV & FM, Broadcast Filters. To learn about the RF Amplifier, read the Circuit Details - High Level RF Amplifier. |
The 4.5 MHz High Pass Filter is optional. The parts for the High Pass Filter are not included in the kit. If you live in a large metropolitan area where several high power AM stations or nearby amateur radio stations are present, you might consider installing the parts. Check out TV & FM, Broadcast Filters for information. |
____6 - .01 capacitors (Bag 3) |
____1 - 100 ohm resistors (brown, black, brown) (Bag 3) |
____2 - 120pf NPO (Bag 5), Next to the 8 turn coils. Orange colored, teardrop, labeled "121". |
____2 - T50-6 yellow cores (Bag 4)and enameled wire (Bag 6) |
____1 - FT50-75 ferrite core (Bag 4) and wire (Bag 6) ____1 - One of the 8 3/4" Black/White wires Notice below the end of the insulation of the wire overlaps the edge of the core about 1/4". This centers the wire so that both ends have the same amount of insulation over the edge of the core. Wind very tight. |
____1 - 2N5109 Transistor and Heatsink (Bag 5), Put the heat sink on the transistor first before soldering to the PCB. Install Bifilar core and Transistor |
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____Place the PCB in front of a bright light. If you see light shining through any of the soldering holes, you missed a solder connection. |
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