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ELECRAFT KX3-2M, Installation And Operating Instruction Manual

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ELECRAFT KX3-2M Installation And Operating Instruction Manual Download Page 23

 

 

 

23

Prepare the KX3 for the KX3-2M or 4M Module 

The KX3-2M or 4M PC board mounts on top of the KXAT3 Antenna Tuner board. If you do not have the 
KXAT3 option installed, your kit will include an adapter board to install in place of the KXAT3.  

 If you do not have the KXAT3 Antenna Tuner installed, disconnect the HF antenna cable from the 

main RF board as shown in Figure 15.  

 

Figure 15. Disconnecting the Antenna Cable from the Main RF Board. 

 Route the antenna coax cable across the RF board, between the toroidal inductors and alongside the 

standoff exactly as shown in Figure 16. 

 

Figure 16. Routing the Antenna Coax. 

 Locate the TO-220 Retainer and the two black 4-40 1/4" (6.4 mm) black flat head screws. Note that 

one screw has a slotted head and the other has a Phillips head. The slotted head screw is nylon while the 
Phillips head screw is steel. Set the Phillips head screw aside for now. It will be installed later.  

Summary of Contents for KX3-2M

Page 1: ...er Input Frequency 9 Sleep Mode 10 Troubleshooting 10 Circuit Description 11 Installing the KX3 2M or 4M Module 12 Preparing for Installation 12 Preventing Electrostatic Discharge Damage 12 Choosing a...

Page 2: ...Damage on page 12 before opening the package containing the KX3 2M or KX3 4M module or working inside your KX3 Specifications General Transmit Frequency Range KX3 2M 144 MHz 148 MHz KX3 4M 69 9 MHz 7...

Page 3: ...fly in the VFO B display area A small padlock symbol in the upper right corner of the display will disappear when VFO is unlocked Turn the VFO knob to XVn ON n is the number of the transverter band yo...

Page 4: ...VHF range than it does on the HF bands Vertical polarization is normally used for FM communications to match the polarization of mobile whips and rubber duck antennas on hand held radios Horizontal po...

Page 5: ...int and 0 to 3 kHz digits followed by tapping Note that the 7 8 and 9 number switches are activated by tapping the AF RF SQL PBT I II and KEYER MIC encoder knobs The following sections describe how to...

Page 6: ...ed values of FM frequency deviation 3 5 kHz for voice and 0 36 kHz for PL tone used by repeaters If different values are used in your area hold MENU and use the VFO knob to locate FM DEV on the LCD Th...

Page 7: ...or details Description You can enter up 23 characters to identify the use of the frequency This data is not displayed at the KX3 QSY Clicking the radio button while the KX3 is connected to the compute...

Page 8: ...r offset will appear below FM on the LCD Be sure you select the correct sign or that corresponds to the direction of the repeater offset If you selected the wrong sign you can change it by holding REV...

Page 9: ...memory locations must be successively numbered locations with no gaps and all of the frequencies must be within the same band You can include frequencies within the band that use different modes such...

Page 10: ...module You can monitor the temperature change while transmitting Tap DISPLAY and turn the VFO knob to display PA 2 in the VFO B area of the LCD The temperature is shown in Celsius VFO Tuning Noise Hea...

Page 11: ...the 23 MHz range J1 connects the I F signals to the KX3 The IF signal passes through a low pass filter to a CMOS SPDT switch When transmitting the CMOS switch passes the I F signal through an attenua...

Page 12: ...to discharge yourself do it only when you are not touching live circuits with any part of your body Use a grounded anti static mat on your work bench see below If you pick up a PC board that was not p...

Page 13: ...re you have the following components in your kit If anything is missing contact Elecraft customer support page 18 KX3 2M or 4M Transverter Assembly Bag E850580 ILLUSTRATION DESCRIPTION QTY ELECRAFT PA...

Page 14: ...ew Pan Head Stainless Steel 4 40 5 32 4 0 mm 2 E700302 Screw Steel Black Flat Head 4 40 1 4 6 4 mm 1 E700253 Screw Nylon Black Flat Head 4 40 1 4 6 4mm 1 E700092 TO 220 Retainer 1 E100615 Coaxial Cabl...

Page 15: ...Figure 3 KX3 2M or 4M Module Installed in the KX3 Separate the Case Halves Disconnect all cables attached to the KX3 and remove the KXPD3 paddles if installed Open the KX3 just as you would to instal...

Page 16: ...he Internal Coaxial Cables Two miniature coaxial cables are used to carry RF signals One cable carries a local oscillator signal from the KX3 main RF board to the KX3 2M or 4M module The second cable...

Page 17: ...g the connector for the cable leading to the BNC connector as shown in Figure 6 You can use long nose pliers to grip the connector as shown in Figure 7 If using the pliers take care not to damage the...

Page 18: ...wn in Figure 8 This is important to provide a good ground for the antenna connector and good contact for the KX3 2M or 4M module power transistor heat sink In the unlikely event you need to clean the...

Page 19: ...n the next step align the flat side of the connector with the flat side of the D shaped hole in the end panel Thread the coaxial cable through the hole in the end panel that was occupied by the plug y...

Page 20: ...ptional KXFL3 Filter option remove the KXFL3 board as shown in Figure 12 Set it aside in an ESD safe place CAUTION Do not press on the large rectangular gray capacitors Doing so may detune the filter...

Page 21: ...onnector and press down on the connector It will require significant force to mate the connectors especially when they are new Press on the connector directly over J4 using a plastic tool such as a pe...

Page 22: ...22 Figure 14 Orienting the Cable at J4 If you removed the KXFL3 filter board see Figure 12 on page 20 replace it now Replace the retaining screw and ensure it passes into the hole in the KXFL3 board...

Page 23: ...own in Figure 15 Figure 15 Disconnecting the Antenna Cable from the Main RF Board Route the antenna coax cable across the RF board between the toroidal inductors and alongside the standoff exactly as...

Page 24: ...on the inside surface of the end panel between the antenna connectors as shown below Be sure the retainer is oriented correctly as shown Figure 17 Secure it with the nylon slotted head screw through...

Page 25: ...F board below as shown in the figure Reconnect the HF antenna cable The two pins are tied together electrically so the connector may be inserted with the pins oriented either way Secure the KXAT3 or a...

Page 26: ...e coaxial connectors on the KX3 2M or 4M board are shown in Figure 21 Note that the KX3 2M or 4M board has no components directly behind the coaxial connectors That allows you to place a solid object...

Page 27: ...he board from behind while you press the connector in place with a tool such as a plastic pen just as you did before at L O connector J4 Figure 22 shows a common pencil used to support the board but a...

Page 28: ...M board in the KX3 as follows Loosen the slotted head screw holding the TO 220 Retainer so the retainer has about a 0 1 3 mm gap between the retainer and the end panel as shown below The heat sink on...

Page 29: ...e black flat head Phillips head screw you set aside earlier through the end panel as shown This screw will clamp the tab of the transistor between the retainer and the end panel for efficient heat tra...

Page 30: ...gure 26 Be sure the coaxial cable does not pass over either of the nearby toroidal inductors Figure 26 Routing the Antenna Coax Between the KXAT3 Inductors Locate the notch on one side of the shield s...

Page 31: ...ield The bumps latch the shield in place Do not operate your KX3 2M or 4M with the shield removed It is required to provide essential isolation between circuits Figure 28 Installing the Shield Reassem...

Page 32: ...rs the original owner of the Elecraft product as disclosed to Elecraft at the time of order Elecraft products transferred by the purchaser to a third party either by sale gift or other method who is n...

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