We will be closed on Dec 21 and resume shipping on Dec 28Universal Dual HF Band Pass Filter Kit
Kits and Parts dot Com
Supplying Toroids, Electronic Parts and Kits to Engineers, Schools and Hobbyists

Home
Trimmer Capacitors
NPO Disc Capacitors
Polystyrene Capacitors
Silvered Mica Capacitors
PA3AKE Filters
W3NQN Filters
WA2EBY ToroidKit
Variable Inductors
Magnet Wire
Diodes
Integrated Circuits
Jacks & Plugs
Transistors & Fets
Misc Parts
RFtoolkits
1Watter-10m QRPp Xcvr
1Watter-12m QRPp Xcvr
1Watter-15m QRPp Xcvr
1Watter-17m QRPp Xcvr
1Watter-20m QRPp Xcvr
1Watter-30m QRPp Xcvr
1Watter-40m QRPp Xcvr
1Watter-80m QRPp Xcvr
1Watter-160m QRPp Xcvr
5Watt 2-30mHz ClassC Amp
Toroids
Cable RF Suppression
Retired Kits
Contact
Orders FAQ
* Place Order *
Build this Universal Dual BPF
Available for 10, 12, 15, 17, 20, 30, 40, 80 and 160 meters.
* DISCONTINUED *

Specs: These bandpass filters are medium bandwidth HF Filters.
The 3 dB bandwidth is about 150 KHz @ 7 MHz.
The 6 dB bandwidth is about 200 KHz @ 7 MHz.
This BPF Kit is for two (2) bands..



Instructions for one band:
For 30 meters, the 2.2 pF cap may be replaced with a 3 pF cap
1. Install C3, and C7.
   a. Install trimmer capacitors into their correct places per the above PCB layout.
       Install with flat side of trimmer into square hole pad.
2. Install L1 and L3.
   a. Cut the spool of Copper Colored Magnet wire into 4 pieces per the above table.
       You should end up with 2 long pieces and 2 pieces that are 4 or 6 inches long.
   b. Wind L1 toroid in a clockwise direction - Toroid Winding Details Here
   c. Prepare the toroid wires for soldering - Magnet Wire Soldering Details Here
       This magnet wire uses 3 layers of Epoxy insulation and is NOT heat stripable.
   d. Install and solder toroid inductor L1.
3. Install L3 just like L1.
   a. Review this example of a dual winding toroid for 30 meters.
          Click picture to enlarge
4. Install C1, and C9.
   a. Install capacitors into their correct places per the above table.
5. Install C5 into the correct place per the above table.
6. Connect the BPF via J1 and J3.
7. Repeat for band # 2.

Toroids, Ferrites