Results 1 to 6 of 6

Thread: Celwave 633-6A type duplexer tuning and factory freq range

  1. #1
    Join Date
    Mar 08, 2014
    Location
    Florida
    Posts
    416
    Thanks
    162
    Thanked 267 Times in 157 Posts

    Default Celwave 633-6A type duplexer tuning and factory freq range

    I see tons of these and similar mobile notch duplexers for sale. Often they are tuned down in the 406 govt band or 470 to 512 t band. Plus the Chinese are selling knock offs on e-bay, without any discussion other than the seller offering to tune to your frequencies.

    Is there any physical or electrical difference in a 406 to 420 MHz band or 450 to 470 MHz band Cellwave 633-6A type duplexer other than where the tuning rods end up after tuning?





    Sent from my SM-T350 using Tapatalk


  2. #2
    com501's Avatar
    com501 is offline T S - Moderator
    CS Forums $upporter
    Join Date
    Jan 18, 2013
    Location
    In Your Network
    Posts
    2,332
    Thanks
    1,492
    Thanked 1,321 Times in 676 Posts
    Country: United States

    Default

    Logic stands to reason (and theory) that a 450 can and a 403 can should be slightly different sizes. I have never been able to get a 438-470 duplexer much below that, and the inter-can coupling lines aren't the issue. The VHF and UHF versions are clearly different dimensions. The Chinese clones on eBay are the same cans that are sold to Motorola. They come (or did a few months ago) from Fingu.
    Retarded Mongoloid on PCP...

  3. The Following 2 Users Say Thank You to com501 For This Useful Post:

    AD0JA (Feb 24, 2018),Magnus (Jan 11, 2018)

  4. #3
    Join Date
    Dec 21, 2011
    Posts
    4,114
    Thanks
    2,688
    Thanked 4,768 Times in 1,437 Posts
    Country: Canada

    Default

    The Chinese clones are absolute garbage. Had one fail after being in service for only a day, with 50 W (rated) going through it. It melted internally. I will post a small video shortly.



    Ignore the God bless you/we love you crap at the end; I was trolling another tech.

  5. The Following 4 Users Say Thank You to Mars For This Useful Post:

    AD0JA (Feb 24, 2018),bsdam (Jan 14, 2018),jry (Jan 11, 2018),mmckenna (Jan 11, 2018)

  6. #4
    Join Date
    Dec 12, 2011
    Location
    Avalon
    Posts
    1,194
    Thanks
    261
    Thanked 310 Times in 150 Posts
    Country: United States

    Default

    From personal experience you won't get the small units to far outside their rated frequency, definitely stay away from the Fingu products.

  7. #5
    Join Date
    Feb 04, 2012
    Posts
    1,645
    Thanks
    72
    Thanked 327 Times in 175 Posts

    Default

    Agreed 100%. The Fingu are junk. I got one for a standalone VRS application.The mobile vibration caused it to drift after a day of operation. The third time that happened in as many days I placed the Fingu in the circular storage container and replaced it with a cellwave duplexer. No issues since then.

  8. The Following 3 Users Say Thank You to Notarola For This Useful Post:

    AD0JA (Feb 24, 2018),Mars (Jan 11, 2018),Viper1-6 (Jan 11, 2018)

  9. #6
    Join Date
    Mar 08, 2014
    Location
    Florida
    Posts
    416
    Thanks
    162
    Thanked 267 Times in 157 Posts

    Default

    OK well this has drifted a bit. Assuming a Celwave 633-6A type duplexer factory tuned in the 406 to 420 MHz band . Could one shorten the housing and tuning rod to raise the frequency band? Does anyone have the factory dimensions of an actual 440-470 band 633-6A duplexer?