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Author Topic: Decibel Duplexers ???? 220 Mhz.  (Read 631 times)
WB2NGX
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Posts: 76




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« on: September 18, 2017, 09:32:49 PM »

I'm guessing that the company that makes these is long gone.
I have model DB4100BPR-D 220 Mhz. duplexers. I'm trying to find documentation on them.

Joe WB2NGX
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W1VT
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Posts: 2364




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« Reply #1 on: September 19, 2017, 07:19:13 AM »

http://www.repeater-builder.com/antenna/ant-sys-index.html
This site has an amazing amount of repeater hardware documentation.

Zack W1VT
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K4JJL
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Posts: 778




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« Reply #2 on: September 19, 2017, 07:51:18 AM »

Decibel got bought out in the early 90s by Allen Telecom, which was then bought out by Andrew, which was then bought out by CommScope.

On most sets of Decibel duplexers, the plunger adjusts the bandpass and the small screw adjusts the notch.  Sometimes there's a way to adjust the insertion loss, usually by twisting the RF connectors.  Other than that, I'd need to see a pic of them.
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WB2NGX
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Posts: 76




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« Reply #3 on: September 19, 2017, 09:01:42 PM »

Thanks for all the info guys. I don't know how to post a picture to this forum.
These duplexers have 2 large cans for the TX and 6 smaller ones for the RX. I tried to find a picture of them by searching the model number but had no luck.

Joe WB2NGX
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WB2NGX
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Posts: 76




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« Reply #4 on: September 19, 2017, 09:03:27 PM »

Decibel got bought out in the early 90s by Allen Telecom, which was then bought out by Andrew, which was then bought out by CommScope.

On most sets of Decibel duplexers, the plunger adjusts the bandpass and the small screw adjusts the notch.  Sometimes there's a way to adjust the insertion loss, usually by twisting the RF connectors.  Other than that, I'd need to see a pic of them.
If you give me an email I'll send you a picture of them.

TNX........
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WW7KE
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Posts: 552




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« Reply #5 on: September 19, 2017, 09:31:55 PM »

Decibel got bought out in the early 90s by Allen Telecom, which was then bought out by Andrew, which was then bought out by CommScope.

Andrew/Decibel is now owned by WISCO International of Miami.  I have no idea when the Decibel office in the DFW area closed.  I worked in their Chicago-area plant in the early '90s, but that location was closed by Allen Telecom in 1992, a few months after I left the company.

http://www.wiscointl.com/decibel/
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He speaks fluent PSK31...  One QSO with him earns you 5BDXCC...  His Wouff Hong has two Wouffs... Hiram Percy Maxim called HIM "The Old Man..."  He is... The Most Interesting Ham In The World!
K0UA
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Posts: 885




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« Reply #6 on: Yesterday at 07:14:55 AM »

And I can help a bit with the picture posting.  Pictures must be hosted offsite and linked to here.  One very easy place is to use postimages:   Here is the site:  https://postimages.org/

Drag and drop an image onto their page.  Then choose the 5th choice down  which is thumbnails for forums. and highlight that URL and do a right mouse click, copy and then right click over here in the reply box and do a paste to get the image in your text.



That is all there is to it, and it seems to work well.
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WB2NGX
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Posts: 76




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« Reply #7 on: Yesterday at 08:01:06 PM »

Like this...........??

Here they are..........



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W9IQ
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Posts: 1534




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« Reply #8 on: Yesterday at 11:57:54 PM »

It appears to me that these duplexers were set up for split band operation. Do the smaller cans contain a model number?

- Glenn W9IQ

 
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- Glenn W9IQ

I never make a mistake. I thought I did once but I was wrong.
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