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Duplexer Specs... Are these considered acceptable/Good?


smokey222
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Good Morning on this Memorial Day.  Came across a duplexer brand called "Intermod" model Model: D440N-4, made in Canada, for what seems to be a great price (about 268.00 USD).  I am seeking input from someone knowledgeable about what is considered decent parameters as I just don't know.  Below is what is listed...

 

Electrical Specifications       Frequency Range MHz 406 to 470 Return Loss(min) dB 18 Insertion Loss(nominal) dB 0.6 Isolation(nominal) dB 80 Impedance Ω 50 Tx-Rx Separation (*) MHz 5 Average Power Input (max) W 100

 

 

Thanks in advance, 

Scott

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The specs look pretty decent. I have not seen that brand before, but it appears that he's got pretty good reviews on Ebay from his buyers - with a 100% feedback rating. The only negative comments seem to regard the shipping from Canada taking too long.

 

80dB of isolation is more than acceptable from a 4 can duplexer. Rule of thumb is 30dB per can (per side), but I can see that there are what appears to be some trimmer capacitors - which will sharpen the notches & help isolation. Generally, those are a good thing, but the quality with which the trimmers are built will ultimately decide the useful lifespan of the duplexer. See: http://www.duplexerrepair.com/2016/12/26/trimmer-capacitor-failures-in-decibel-products-duplexers/

 

It appears from the pictures & pricing that they're trying to strike a reasonable balance between quality and price, and they're shooting for the ham and hobby market - and at that price, they should have pretty good response if the quality holds up.

 

Assuming you're going to use it as a lower power repeater duplexer, it looks like it should perform well.

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The specs look pretty decent. I have not seen that brand before, but it appears that he's got pretty good reviews on Ebay from his buyers - with a 100% feedback rating. The only negative comments seem to regard the shipping from Canada taking too long.

 

80dB of isolation is more than acceptable from a 4 can duplexer. Rule of thumb is 30dB per can (per side), but I can see that there are what appears to be some trimmer capacitors - which will sharpen the notches & help isolation. Generally, those are a good thing, but the quality with which the trimmers are built will ultimately decide the useful lifespan of the duplexer. See: http://www.duplexerrepair.com/2016/12/26/trimmer-capacitor-failures-in-decibel-products-duplexers/

 

It appears from the pictures & pricing that they're trying to strike a reasonable balance between quality and price, and they're shooting for the ham and hobby market - and at that price, they should have pretty good response if the quality holds up.

 

Assuming you're going to use it as a lower power repeater duplexer, it looks like it should perform well.

 

 

Thanks for taking a look!  This would be for a GMRS system with 50 watts max.  Thanks again!

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I just purchased the same one.

Pretty good so far.

50watts in 43watts out.

80db of isolation is just as good as my 4 big cans decibel vhf band pass/band reject duplexer. Very impressive.

I like the use of silver plating. Nickle makes a mess out of tx'n uhf.

Great construction and size.

I am glad you posted... I haven't pulled the pin yet and am happy to hear from someone that actually put their hands on it!  Thanks! 

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