ELECRAFT® K3 HIGH-PERFORMANCE 160 – 6 METER TRANSCEIVER KBPF3 GENERAL COVERAGE RECEIVE OPTION INSTALLATION INSTRUCTIONS Rev C, December 22, 2007 Copyright © 2007, Elecraft, Inc.
Contents Introduction............................................................................................................................................... 3 Customer Service and Support............................................................................................................................ 3 Technical Assistance ....................................................................................................................................... 3 Repair / Alignment Service ....
Introduction This manual covers the installation of the KBPF3 General Coverage Receive option in your K3 transceiver. The KBPF3 provides the proper input filters to optimize receiver sensitivity outside of the Ham bands over the tuning range of 500 KHz to 30 MHz and from 48 MHz through 54 MHz. The KBPF3 consists of a single circuit board the plugs into the K3 RF board the covers the bottom of the K3 chassis enclosure, and is supported by two threaded standoffs that mount on the RF board.
Elecraft 1-Year Limited Warranty This warranty is effective as of the date of first consumer purchase. It covers both our kits and fully assembled products. For kits, before requesting warranty service, you should fully complete the assembly, carefully following all instructions in the manual. What is covered: During the first year after date of purchase (or if shipped from factory, date product is shipped to customer), Elecraft will replace defective or missing parts free of charge (post-paid).
Inexpensive static dissipating work mats are readily-available that will steadily and safely drain off any charges built up on parts or circuit boards placed on them. They are supplied with a lead that connects the mat to the common workbench ground. Also, metal cabinets on test equipment used on the bench should be tied together and connected to the common ground. Most importantly, you must have a way of continuously draining off any static charges that occur on your body.
Parts Included The following parts should be included in your kit. Check to ensure you have them all. If any parts are damaged or missing, contact Elecraft for replacements (see Customer Service and Support, page 3). QTY. ELECRAFT PART NO. ESD Sensitive. Follow ESD safe handling procedures. Keep in ESD-safe bag until installed. 1 E850269 Standoff, 4-40, 1/2” (13 mm) 2 E700061 Screw, 4-40, 1/4” (6.
Installation Procedure As you install components and reassemble your K3, be sure all the screws are in place and secure, but do not over tighten them. Failure to tighten all screws may result in poor shielding of sensitive components, resulting in possible noise or birdies in the receiver as well as other difficult-to-trace problems. Removing the Top Cover Disconnect power and all cables from your K3. Remove the nine screws to free the top cover as shown in Figure 1.
Installing the Standoffs Check the RF board that covers the bottom of the chassis area to see if the standoffs shown in Figure 2 are installed. (Note that the stiffening bar across the top of the K3 chassis has been removed to show the standoffs more clearly.) Do the following steps only if the standoffs are not already installed as shown. If the standoffs are already in place, go directly to Installing the KBPF3 Board on page 10. FRONT OF K3 KBPF 3 STANDOFFS Figure 2. KBPF3 Standoff Locations.
Install two standoffs on the RF board as shown Figure 4. Be sure you place a split lock washer under the head of the screw and between the standoff and the board as shown. ESD SENSITIVE! WEAR A GROUNDED WRIST STRAP OR TOUCH AN UNPAINTED METAL GROUND BEFORE HANDLING THE RF BOARD. TOP OF RF BOARD 4-40 1/2" (13 mm) STANDOFF 4-40 SPLIT LOCK WASHER 4-40 SPLIT LOCK WASHER 4-40 1/4" (6.4mm) ZINC PAN HEAD SCREW Figure 4. Installing KBFP3 Standoffs.
Installing the KBPF3 Board There are three connectors on the bottom of the KBPF3 board that must be properly mated to P44A, P44C and P44E on the RF board (see Figure 5). Even though the connectors may be hard to see as they are mated, especially if the KPA3 shield is installed, they can be aligned as follows: Set the KBPF3 board in place over the standoffs, aligning it so the holes in the KBPF3 board are aligned with the screw holes in the tops of the standoffs. This will align the connectors.
Replacing the Top Cover REPLACE ALL THE SCREWS! The K3's chassis has excellent rigidity despite its light weight. The screws that hold the top cover in place are an important part of the structural design. Be sure to replace all the screws and verify they are tight whenever you replace the cover or other panels Turn the K3 right side up to replace the top cover.
