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Author Topic: Wacon Duplexer jumper ?  (Read 2105 times)

PY2HR

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Wacon Duplexer jumper ?
« on: June 11, 2019, 04:08:49 PM »

Hi, does anyone know the standard length of jumper connection between the cans that comes with the new BPBR wacon duplexer for VHF 600khz?
« Last Edit: June 11, 2019, 04:13:04 PM by PY2HR »
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K4JJL

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RE: Wacon Duplexer jumper ?
« Reply #1 on: June 12, 2019, 09:49:42 AM »

Cable length is critical for optimum performance in duplexers. Use good double shielded cable and make the cables at ½ wavelength in electrical length, EI,  5600/Freq in MHz times velocity factor. This will repeat the cable impedance ever ½ wavelength.  This is necessary to keep the cavities from interacting and effecting the Q of each bandpass during tuning. Velocity for Foam is about .82-.84 and the velocity for Plastic is about .66.
Tune each cavity as a single unit and then combine them for the final tune. You will need to assemble cables for the high pass side as well as the low pass side. The interconnection cables must be about at ½ wavelength in electrical length or you will never obtain maximum isolation.

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PY2HR

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RE: Wacon Duplexer jumper ?
« Reply #2 on: June 12, 2019, 01:30:21 PM »

Cable length is critical for optimum performance in duplexers. Use good double shielded cable and make the cables at ½ wavelength in electrical length, EI,  5600/Freq in MHz times velocity factor. This will repeat the cable impedance ever ½ wavelength.  This is necessary to keep the cavities from interacting and effecting the Q of each bandpass during tuning. Velocity for Foam is about .82-.84 and the velocity for Plastic is about .66.
Tune each cavity as a single unit and then combine them for the final tune. You will need to assemble cables for the high pass side as well as the low pass side. The interconnection cables must be about at ½ wavelength in electrical length or you will never obtain maximum isolation.



thanks for the answer, I know how to calculate these measurements, I actually want to know the original length of the jumper that the manufacturer sends along with the BpBr duplexer for 600khz. if someone had this curiosity to measure and can share with me thank you very much. 73 "
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W9IQ

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RE: Wacon Duplexer jumper ?
« Reply #3 on: June 12, 2019, 05:45:35 PM »

.This will repeat the cable impedance ever ½ wavelength.  This is necessary to keep the cavities from interacting and effecting the Q of each bandpass during tuning.

The 0.5 wavelength does not repeat the cable impedance. It will simply ensure that the input impedance of the coax is largely the same as the duplexer to which it is connected. It isn't exact due to SWR losses in the coax if the duplexer impedance isn't exactly equal to the coax characteristic impedance (in which case the length is largely inconsequential).

None of my 2 meter duplexers use 0.5 electrical wavelength interconnects. They are all substantially shorter.

- Glenn W9IQ
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- Glenn W9IQ

God runs electromagnetics on Monday, Wednesday and Friday by the wave theory and the devil runs it on Tuesday, Thursday and Saturday by the Quantum theory.

W9IQ

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RE: Wacon Duplexer jumper ?
« Reply #4 on: June 12, 2019, 06:20:10 PM »

The common electrical cable length between duplexers is slightly less than 0.25 wavelengths (or an odd multiple thereof). How much less depends upon the internal construction of the particular duplexer.

- Glenn W9IQ
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- Glenn W9IQ

God runs electromagnetics on Monday, Wednesday and Friday by the wave theory and the devil runs it on Tuesday, Thursday and Saturday by the Quantum theory.

KB8VUL

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RE: Wacon Duplexer jumper ?
« Reply #5 on: June 24, 2019, 09:42:24 PM »

The split doesn't have as much to do with the cable length as the frequency that the duplexer was tuned for. 
And a BpBr Wacomm wasn't overly critical on cable length to begin with. 

If you were talking about those weird hybrid ring duplexers that Sinclair build, that's a whole different thing.
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K7LZR

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RE: Wacon Duplexer jumper ?
« Reply #6 on: June 28, 2019, 10:44:02 AM »

I have a Wacom WP-639 VHF duplexer here, I will measure a jumper for you :)
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K7LZR

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RE: Wacon Duplexer jumper ?
« Reply #7 on: June 28, 2019, 10:51:07 AM »

That cable is 12.25 inches(31.1cm) in length as measured from tip to tip of the connectors. Hope this helps!
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PY2HR

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RE: Wacon Duplexer jumper ?
« Reply #8 on: July 01, 2019, 06:44:08 PM »

That cable is 12.25 inches(31.1cm) in length as measured from tip to tip of the connectors. Hope this helps!

Dear K7LZR, 31.1 cm in length, measured from the tip to the tip of the connectors, can you please measure the length of the duplexer jumper for the RX and Tx radios?
TKS .. 73 '' to everyone.
Moisés
PY2HR
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PY2HR

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RE: Wacon Duplexer jumper ?
« Reply #9 on: July 01, 2019, 06:47:44 PM »

That cable is 12.25 inches(31.1cm) in length as measured from tip to tip of the connectors. Hope this helps!

Dear K7LZR, please know what feature (example: RG214 / RG400 Et ...) of the cable jumper that accompanies the Wacon?
TKS ..
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W1BR

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RE: Wacon Duplexer jumper ?
« Reply #10 on: July 07, 2019, 06:29:43 AM »

I thought the cables were 1/4 y for a Br/Bp duplexer. Is the Wacom this style of duplexer:

http://www.repeater-builder.com/antenna/quarter-wave-cables.html
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PY2HR

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RE: Wacon Duplexer jumper ?
« Reply #11 on: July 10, 2019, 01:53:36 PM »

I thought the cables were 1/4 y for a Br/Bp duplexer. Is the Wacom this style of duplexer:

http://www.repeater-builder.com/antenna/quarter-wave-cables.html


Very useful your information, TKS.
73 "PY2HR
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KA5IPF

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RE: Wacon Duplexer jumper ?
« Reply #12 on: August 05, 2019, 07:29:39 PM »

I am looking at a set of Wacom WP-639 Cavities. If I'm reading the first of the SN correctly made in 27th week, 1996. They were ordered by our club for the club frequency of 146.90/146.30 MHZ. They have Crimp-on Amphenol connectors with solder tip model # 182311. The 5 T-Connectors are Amphenol 49199 M-358. The cables are Coleman Cable 8421F M17/75-RG-214 Mil C-17. The cables are all the same length. Tip to tip 13.225 +/- .01. They work fine and were cut for our frequency and not converted to the ham bands. I can take some pictures if anyone is interested. I will not take them apart.
« Last Edit: August 05, 2019, 07:48:33 PM by KA5IPF »
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WA8NVW

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RE: Wacon Duplexer jumper ?
« Reply #13 on: August 12, 2019, 05:01:08 PM »

That cable is 12.25 inches(31.1cm) in length as measured from tip to tip of the connectors. Hope this helps!

Dear K7LZR, 31.1 cm in length, measured from the tip to the tip of the connectors, can you please measure the length of the duplexer jumper for the RX and Tx radios?
TKS .. 73 '' to everyone.
Moisés
PY2HR

The cables running from the T and R ports on the duplexer cans to the transmitter and receiver are not critical length, nor is the cable going to the antenna.  They are simple 50 ohm cable, solid shield (Heliax or Superflex, or equivalents from other manufacturers) MUCH preferred over any sort of braided shield.  Use silver plated brass N type connectors made for that specific cable, do NOT use nickel plated and DEFINITELY DO NOT USE PL259 with adaptors!!

Also remember when you are performing the fine tuning adjustments, any open port (Tx, Rx, Ant) MUST be terminated with a 50+j0 resistive load.
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