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Base Can you measure your I- Max 2000

Discussion in 'CB Antennas' started by AudioShockwav, Jan 6, 2020.

  1. AudioShockwav

    AudioShockwav Extraterrestrial Admin
    Staff Member

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    Anyone that has a I Max 2000 base antenna, can you take some measurements and post them here?
    This is part of a thread reporting that the I-Max 2000 has been shortened for shipping reasons.
    Thank you for you help.



    73
    Jeff
     
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  2. KD2GOE

    KD2GOE W9WDX Amateur Radio Club Member

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    Top: 95.25"
    Mid: 94"
    But: 82" to the black ring adjust.
     
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  3. Recon

    Recon NY 881

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    Purchased on 12 June 2019
    I measured and verified the total assembled length to be 24 feet prior to attaching it to the 40 ft. telescopic mast.
     
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  4. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    Very old Imax 2000

    Top = 95.125" including lock washer
    Middle = 94.125" including lock washer
    Bottom - base of mount = 95.5"
    -----------------------------------
    284.75" = 23.73'
     
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  5. M0GVZ

    M0GVZ Sr. Member

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    Probably as equally old, certainly enough to give me fibreglass splinters, can confirm that my UK/European Imax 2000 is the same as Marconi's.
     
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  6. Cam Tetzlaff

    Cam Tetzlaff 006 Wisconsin

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    Purchased this Max2000 on 1/2/20 from Copper. I have a fully assembled length of 23' 4 5/8". That is taken as the antenna was lying flat on my basement floor and straight inline with my tape measure (used to be a carpenter). The top section is 94 5/8". That is the longest section in the box. The bottom section is 94 1/2". The tuning rings were loose when unpackaged.
     

    Attached Files:

  7. Recon

    Recon NY 881

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    What the heck? Those are some weird dimensions! Maybe you have a "mix and match" antenna. Just another question for the manufacturer. 7-3/8" shy of 24' and 1' 4-5/8" longer than 22' starts a new ball game and more questions. With the tuning rings loose, maybe you received a returned antenna. Please keep us posted of the VSWR readings.
     
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  8. ENC Pirate

    ENC Pirate Ocean One Cape Hatteras

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    Solarcon IMax2000 ,24 feet on the button. Purchased Amazon Services Nov 19 2019
     
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  9. Recon

    Recon NY 881

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    Problem solved!
    1st shift made the bottom section.
    2nd shift made the mid section.
    3rd shift made the top section.
     
  10. Recon

    Recon NY 881

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    Problem solved!
    1st shift made the bottom section.
    2nd shift made the mid section.
    3rd shift made the top section.
     
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  11. Recon

    Recon NY 881

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    What this boils down to is, the manufacturing tolerance for the total length is 22' - 24'.
    Obviously they are not using a calibrated production jig to manufacture the sections. Who knows, maybe one section may not have a wire in the center.
     
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  12. Recon

    Recon NY 881

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    That equates to 271.25" = 22ft. +.605" (almost 5/8") What is the measurement from the ring adjust to the coax connection?
    What area (top, bottom, middle?) of the black ring threaded area did you measure from?
     
  13. Recon

    Recon NY 881

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    Is everyone measuring from the coax connector to the top of the top section with all sections assembled with the lockwashers?
     
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  14. 2315 Robert

    2315 Robert Grateful

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    Glad you posted that. My box said MAX 2000 purchased 2019. Will be awhile before I can get it down to measure. SWR is higher than the 30yo IMAX.
     
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  15. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    Recon, good point Recon.

    In my efforts to measure my old Imax I measured and recorded the individual element lengths for all individual parts from top to bottom.

    I was only interested in the radiator length to use with my Eznec model of the Imax. I took my measurements with the antenna fully assembled, but I found it difficult to measure the overall length accurately with a tape measure.

    So, I recently used my element length measurements and added them up. I could have made a mistake in adding or leaving a small measurement out. I no longer have my Imax. A Ham buddy I sold it too is recovering from a stroke...so he is not able to help me with measurements.

    I also used the information in the images and text of the document below. Note here that Tech 833, the author, shows different dimensions that I recorded on my Imax. It is true we find different measurements from different folks. IMO, this is not quite the same as the recent questions raised about the Imax being noticeably shorter than in the past.

    Click below for link to article "Imax 2000 Exposed":

    http://www.copperelectronics.com/discus4/messages/7750/10782.html?1011570399


    Take good note of the images to get the parts in mind. Also check the Schematic #1 closely as well. I see the bottom end of the Imax radiator wire near the middle of the brass capacitor and from there down it is 16" inches to the coax connector.

    I also have the matching section including the wire inside the base section from the connector to the tip of the wire. I find the length of the area from the connector to the center of the capacitor is about 16" inches. So, if one wants the length of the Old Imax radiating element, just take the overall length of 288" - 16" = 272" inches as measured from the bottom of the mounting bracket at the coax connector to center of the capacitor where the Imax radiator starts. The Imax radiator seems to be just floating above ground. Inside the capacitor the two PVC insulators are end to end with the wire plugs in the plastic. This places the radiator wire and the matching section wire close together with a small gap. This is my opinion.

    My 27.205 MHz model I posted earlier uses the overall length dimension of 284.75" - 16" = 268.75" inches for the Imax radiator length. Here the model shows resonance with the value of (R) resistance = 38.02 ohms and the value of (X) reactance = +J 1.501 ohms at 27.205 MHz, and SWR = 1.318. I tweaked the length to get the reactance as low as possible while maintaining the maximum gain possible. This is how I come to an overall length of 284.75" inches.
     
    #15 Marconi, Jan 15, 2020
    Last edited: Jan 15, 2020
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