ELECRAFT KRX3 Betriebsanleitung

ELECRAFT K3 HIGH-PERFORMANCE 160 – 6 METER TRANSCEIVER KRX3 HIGH-PERFORMANCE SUBRECEIVER INSTALLATION AND OPERATION Rev. E, July 6, 2010 C

10E850249 I.F. Crystal Filter Bag (or Box) NOTE: If the optional 8-pole 2.8K filter is purchased instead (see next item) this filter is not supplie

11Installation Procedure K3 KIT BUILDERS: If you were directed here to install the KRX3 Subreceiver as part of the initial K3 assembly, remove the

12If your K3 has the K144XV 2-meter option installed, remove the three 6-32 black flat head screws holding it to the left side panel (see Figure 4)

13Remove the screw shown in Figure 6. It is located directly behind the front panel microphone connector. There may be a lock washer under the scre

14 CAUTION: Before continuing on with the next step, be sure you have removed the three top Front Panel Assembly screws shown in Figure 7. You may

15With the three screws removed, the main DSP board is held on to the front panel board by two multi-pin connectors. Slip your finger tips between

16Mount the three standoffs on the component side of the main DSP board as shown in Figure 14. Be sure that: The standoffs are on the component si

17 Locate resistor R3 on the front panel board (the board still mounted on the front panel assembly). If R3 is positioned above the board on its le

18Plug the aux DSP board into the main DSP board by mating P52 and P53 on the aux DSP board (at the narrow end) with J52 and J53 on the main DSP bo

19panel boards (see Figure 19). If necessary, unplug the DSP board assembly and adjust the position of R3 to ensure the leads are clear of other so

2 Contents See Appendix A to install or change crystal filters in a previously assembled KRX3 Introduction ...

20Hold the front panel in place against the chassis assembly and turn the unit over to look at the two multi-pin connectors on the top of the RF bo

21Checking and Modifying Resistor R91 and DAC Input Circuits The value of resistor R91 must be 22 ohms. Perform the following procedure to check th

22Installing the KRX3 Module Supports Install two standoffs on the K3 RF board (the large board filling the bottom of the K3) as shown in Figure 24

23Installing the Auxiliary KSYN3 Synthesizer The KSYN3 is supplied with a stiff metal plate covering the front of the pc board. This plate keeps th

24Install the Auxiliary KSYN3 board on the back of the front panel shield between the KREF3 board and the side panel. Use the hardware exactly as s

25Locate the four coaxial TMP cables supplied and sort them by length. There are two 6” (15 cm) one 10” (25 cm) and one 12” (30 cm) cables. These a

26Only one of these options can be installed at a time. You can use the front panel menu controls to select either the antenna shared with the main

27Installing the Auxiliary KRX3 Antenna Input Via the Rear Panel BNC Connector With this option the KRX3 Auxiliary Antenna input is routed to a BNC

28 Figure 32. Removing Side Panel Hardware, Part 2. Remove the dummy plug from the AUX RF connector hole in the back panel directly below the SO-23

29If you have the KAT3 option installed, there will be an SO-239 connector in the ANT2 location. If so, remove the lower screw, lock washer and nut

3Introduction If your KRX3 is already installed in your K3, turn to Using the Sub Receiver on page 44 for operating instructions. The KRX3 subrec

30 Figure 35. Routing TMP Cable to Rear Panel AUX RF Connector with KPA3 Installed. Replace the right side panel on the K3, installing the 4-40 3/1

31Install four standoffs on the KRX3 main circuit board as shown in Figure 37. Be careful to use the correct length standoff and the exact combinat

32Table 1. Installing Crystal Filters. Install the filters on the KRX3 board as shown in Figure 38. Use the screw and lock washer s

33 Figure 39, Main KRX3 Board Ready for Installation. Place the KRX3 main circuit board in the bottom shield so that the 1-1/2” screws extend thro

34 Figure 41. Mounting the KPBF3 Board. Locate the subreceiver RF module top cover. It has a label with places to record the bandwidth (BW), and fr

35 Installing the KRX3 Subreceiver Module If you haven’t removed it already, remove the chassis stiffener bar. The stiffener is shown in Figure 7.

36Remove jumper W4 from connector J64A on the K3 RF board. J64A is near the KIO3 board as shown in Figure 45. On some older RF boards, W4 is a jump

37Plug the SUBOUT interface board in J64B on the K3 RF board as shown in Figure 47. J64B is between the K3 roofing filters and the front panel. Be

38 Connect a 6” (15 cm) TMP cable to J5 on the KREF3 board (see Figure 49). Connect a 6” (15 cm) TMP cable between J1 on the KREF3 board and J83

39If installed, attach the antenna cable connected to either the KAT3 or to the AUX RF BNC jack on the rear panel to J92 at the end of the KRX3 as

4Customer Service and Support Technical Assistance You can send e-mail to [email protected] and we will respond quickly - typically the same d

40Secure the KRX3 module to the two standoffs using 1-1/2” (38 mm) 4-40 pan head screws as shown in Figure 51. The screws will pass through the int

41 Final Assembly Remove the covering over the self-adhesive side of the foam pad and press the adhesive side against the speaker magnetic shield (

42Position the top cover on the K3. Note that the tab on the back center goes under the rear lip of the K3 rear panel. Secure the top cover with th

43Operation Preparing for Operation If you installed the KRX3 subreceiver yourself, you must complete the following before you can operate the subr

44Using the Sub Receiver The KRX3 option adds an independent, high-performance sub receiver to the K3. It allows you to monitor a second frequency

45receiver signal loss in this case, use the sub receiver’s AUX input. When the main and sub receivers are used on separate bands, some additiona

A-1 Appendix A: Installing Crystal Filters in the KRX3 Subreceiver The crystal (roofing) filters in the KRX3 subreceiver are contained in the L-shap

A-2 Observe ESD precautions when working inside your K3. Wear an ESD wrist strap or frequently touch an unpainted metal ground while working. Remove

A-3 Remove the KRX3 RF module as follows. The circled numbers refer to Figure A-4 below. Remove the two long screws that attach the KRX3 enclosur

A-4 Remove the RF board from the lower half of the enclosure as follows (see Figure A-5): Remove the two sleeves from the long screws. If the KBPF3

5Preventing Electrostatic Discharge Damage There is no climate or work location where the components of your K3 are safe from Electrostatic Dischar

A-5 Important: The information recorded in the next step is required to enable your filters after reassembling your K3. Record the data in the table

A-6 CAUTION 1) Do not use screws longer than 1/4” (6.4 mm) to mount the filters. Longer screws may extend into the optional 8-pole filter and dest

A-7 If you removed the KBPF3 board, replace it. Be sure the three connectors are aligned so all the pins engage. The connectors are visible from the

6We strongly recommend you take the following anti-static precautions (listed in order of importance) to avoid trouble:  Leave ESD-sensitive part

7Parts 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

8ILLUSTRATION DESCRIPTION QTY. ELECRAFT PART NO. KNB3 SUBIN Board ESD Sensitive. 1 E850331 KNB3 SUBOUT Board 1 E850332 KRX3 Enclosure, Top

9ILLUSTRATION DESCRIPTION QTY. ELECRAFT PART NO. Standoff, Hex Male/Female, 7/16” (11mm) 3 E700017 Unthreaded Sleeve Spacer, 7/8” (22 mm) 2 E