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

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    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?





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    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...

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    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.
    Last edited by Mars; 01-10-2018 at 11:49 PM.

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

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    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.

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    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?