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How To Convert a set of Wacom WP-604, WP-604-A, WP-604-B, WP604-C and WP-604-D Duplexer to work on the 6 meter amateur band 50-55 MHz

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  • How To Convert a set of Wacom WP-604, WP-604-A, WP-604-B, WP604-C and WP-604-D Duplexer to work on the 6 meter amateur band 50-55 MHz

    Here is how I modified my WP-604-C and WP-604-D to work on the Ham / Amateur 6 meter band.
    I have a set of Wacom WP-604-C and a set of WP-604-D-6-SP that I have converted / modified to work on the 6 meter amateur band 50-55 MHz.
    My repeater pair has 1 MHz separation. Here is how I did it.
    These instructions are intended to aid in the conversion of a WP-604-D to a 640-E. They are not intended to be precise. You will need to have some skill at
    soldering copper pipe.

    Conversion of WP-604-D to WP604-E

    1. Remove center conductor assembly from cavity and disassemble. Be careful not to damage the finger-stocks.
    In the picture below the top conductor is modded for 6 meters 50-55 MHz
    the middle conductor is a stock WP-604-D 45-50 MHz
    The bottom conductor id from a WP-604-C 40-45 MHz
    wacom wp-604





    wacom wp-604

    2. Unsolder the bushing and end plug on the F.C.C. (fixed center conductor) and remove.


    3. Remove appropriate amount of the F.C.C. to make the total length of the tube 53 inches long. F.C.C. MUST be shortened from the top, do not cut the end
    that has the finger-stock.

    4. Resolder the bushing in place at 1-3/4 inch from the top end of the F.C.C to the bottom of the bushing threads.
    In the picture below the top is the original and the bottom is a modified conductor. Notice the lower bushing location.


    5. Resolder the end plug in the F.C.C.

    6. Unsolder the Invar rod from from the end plug on the M.C.C (moveable center conductor) and slide out.

    7. Measure from the threaded end of the Invar rod 65.5 inches, cut off to make the Invar rod 65.5 inches long overall.

    8. Resolder the Invar rod onto the end plug of the M.C.C.
    wacom wp-604

    9. Reassemble center conductor assembly being careful not to damage the finger-stock.

    10. Make an index mark on the bottom of the can and side of the can. Remove the bottom of the can by drilling out the three rivets then using a hammer lightly
    knock on one side of the bottom to knock it sideways then remove from bottom of can.

    11. Remove the inner brace by removing the two screws on the side of the can and pull out the brace and save the screws.wacom wp-604

    12. Now if you have the Wacom WP-604-A, WP-604-B or the WP604-C duplexers the cans are 80 inches tall and need to be cut down to 72 inches tall.
    if you prefer not to cut the height of the cans you can move the bottom of the can up inside of the can to make the can internal cavity the same as
    a 72 inch can. Do not install the bottom of the can yet.

    13. Measure down from the top of the can 50 inches and mark and drill two new holes opposite of each other to mount the inner brace.

    14. Reinstall the inner brace at the 50 inch holes with the two screws saved earlier.

    15. Insert the center conductor assembly into the cavity being careful not to damage the inner brace. Torque the bushing to approx. 100 Ft-Lb.

    16. Reinstall the bottom of the can using your index mark and install new rivets or screws to secure it in place. If you had to shorten the can then you will
    need to drill new holes in the bottom of the can to secure it.

    The important interconnect cables for 50-55 MHz:
    37 inches of RG-214 with UHF connectors measured tip to tip.
    This is for the cavity to cavity and cavity to antenna tee.

    Adjust cable lengths on stubs to get more tuning range of the notches.
    Approximate stub cable starting point:
    High Pass side is direct stub attachment or as short as possible.
    Low Pass side is is 4 inches.
    In the picture below you can see the low pass side notch . The right side can is original and the left side is modded.
    wacom wp-604
    In the picture below you can see the notch for the high pass side. On the left you can see the direct connection and on the right you can see the original.
    wacom wp-604

    wacom wp-604
    Attached Files
    IC-9100, IC-7100, AT-180, Yeasu G-5500, GS-232B, JT222M, HRI-200 Wires-X, Astron RM-60M, DR-1X, SCOM 7330, Wouxun KG-UV950P, TYT TH-9000D, Motorola CDM 1250, Stepper IR DB11 Antenna

  • #2
    Here are some pictures.

    Here is the inner brace.
    Click image for larger version  Name:	IMG_7165 (Small).JPG Views:	1 Size:	176.8 KB ID:	458



    Here you can see the new hole that i drilled to relocate the inner brace.
    wp604



    Here you can see where I soilder the M.C.C (moveable center conductor) back on the Invar rod.
    Click image for larger version  Name:	IMG_7172 (Small).JPG Views:	1 Size:	112.0 KB ID:	460



    In this picture the top F.C.C. (fixed center conductor) has been modified for the 6 meter 50-55 MHz band.
    The second or middle F.C.C. is the original one from a Wacom WP-604-D and 4" longer than what we need.
    The bottom F.C.C. is from a Wacom WP-604-C it is about 10" longer than what we need.
    Click image for larger version  Name:	IMG_7174 (Small).JPG Views:	2 Size:	203.9 KB ID:	462



    Here the top is a original unmodified F.C.C.
    The bottom is the modified F.C.C. and you can see that the bushing is mounted lower than the original. 1-3/4 inch from the top to the bottom of the threads.
    Attached Files
    IC-9100, IC-7100, AT-180, Yeasu G-5500, GS-232B, JT222M, HRI-200 Wires-X, Astron RM-60M, DR-1X, SCOM 7330, Wouxun KG-UV950P, TYT TH-9000D, Motorola CDM 1250, Stepper IR DB11 Antenna

    Comment


    • #3
      Here is the bushing.
      Click image for larger version  Name:	IMG_7184 (Small).JPG Views:	1 Size:	145.1 KB ID:	464



      Here is the end cap.
      Click image for larger version  Name:	IMG_7186 (Small).JPG Views:	1 Size:	173.1 KB ID:	465



      Here on the top you can see the original center conductor and
      on the bottom you can see the modified center conductor which has the bushing solder lower an 1-3/4 from the top to the bottom of the threads.
      Click image for larger version

Name:	IMG_7189 (Small).JPG
Views:	1
Size:	168.4 KB
ID:	468



      Here on the ow pass side you can see the can on the left is the original notch adjustment and
      on the right the shorter coax will make a one MHz separation possible.
      Click image for larger version  Name:	IMG_7192 (Small).JPG Views:	1 Size:	135.1 KB ID:	466



      Here on the right you can see the original high side pass notch filter and
      on the left you can see the modified direct connect connection for the notch.
      Click image for larger version  Name:	IMG_7194 (Small).JPG Views:	1 Size:	117.7 KB ID:	467

      IC-9100, IC-7100, AT-180, Yeasu G-5500, GS-232B, JT222M, HRI-200 Wires-X, Astron RM-60M, DR-1X, SCOM 7330, Wouxun KG-UV950P, TYT TH-9000D, Motorola CDM 1250, Stepper IR DB11 Antenna

      Comment


      • #4
        Here I have attached a copy of patr of a letter dated 11-20-1994 from Alan White at Wacom on instructions on how to a conversion of a WP-604D to WP-604E.

        Attached Files
        IC-9100, IC-7100, AT-180, Yeasu G-5500, GS-232B, JT222M, HRI-200 Wires-X, Astron RM-60M, DR-1X, SCOM 7330, Wouxun KG-UV950P, TYT TH-9000D, Motorola CDM 1250, Stepper IR DB11 Antenna

        Comment


        • #5
          I cannot see pictures in upper part of this document.
          please advise.
          Harold K5WHB

          Comment


          • #6
            Hi Harold K5WHB,
            I have restored the pictures in the first post. Let me know if you need any more help.
            Thanks for joing the form and add some post of your own if you would.
            IC-9100, IC-7100, AT-180, Yeasu G-5500, GS-232B, JT222M, HRI-200 Wires-X, Astron RM-60M, DR-1X, SCOM 7330, Wouxun KG-UV950P, TYT TH-9000D, Motorola CDM 1250, Stepper IR DB11 Antenna

            Comment

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