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WACOM WP-641 vs. Sinclair Q2330E

 

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I have both of these duplexers available to replace an existing system.? The site itself is a water tower with an existing DB224 that has been made available to me.? It is mounted at the very top-center of the tank.? There is a backup fire department repeater at the site on UHF.? I don’t even think it’s plugged in.

The tower also has 5G panels mounted all the way around the perimeter.

Given that space is not a consideration and all things being equal, which of the subject duplexers would you choose to put behind an MSR-2000 running 50 – 60 watts out of the PA?? I have experience with the WP-641, but not the Sinclair.

73,

Mike

WM4B
 

Kind of a tossup, similar specs for isolation @500KHz but the Sinclair advertises .1dB less insertion loss per leg. The Sinclair seems to be a current product where the Wacom would be getting quite old.?
 

I still love my WACOM WP 641 that I bought new back in 1983.. It's been retuned a couple of times to new frequencies and it floated in tropical storm Harvey water for almost 3 weeks as the site was underwater totally. Still working just fine according to my analyzer... Kit made some good products at reasonable prices... I've dealt with Sinclair as well and they're all right. I don't think a 0.1 DB is going to make any difference on the air


On Thu, Mar 27, 2025, 7:06 PM Mike via <prcradio=[email protected]> wrote:
Kind of a tossup, similar specs for isolation @500KHz but the Sinclair advertises .1dB less insertion loss per leg. The Sinclair seems to be a current product where the Wacom would be getting quite old.?
 

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The WACOM WP-641 provides 93 dB of rejection at 1.5dB of insertion loss at 600 kHz - if it's a UHF connector version.? If it's an N connector version the rejection is 91 dB or so (yes it's less).? It's easy to tune with simple equipment.? If the cavity interconnect cables say "Modified RG214" you should consider replacing that cable with real RG214/U.? While the cable supplied is double shielded - it's not silver plated.

The Sinclair Q2330e provides nearly 100dB of rejection at 1.5dB of insertion loss at 600 kHz.? This duplexer is considerably more difficult to tune, requiring a VNA (or RLB) to set the pass frequencies.

You don't state what your receive sensitivity is, or whether or not you're going to use a preamp.? If not - either duplexer is sufficient for the MSR-2000.? If you want more reserve isolation - use the Sinclair.

Kevin W3KKC

On 3/27/2025 6:27 PM, Mike Besemer - WM4B via groups.io wrote:

I have both of these duplexers available to replace an existing system.? The site itself is a water tower with an existing DB224 that has been made available to me.? It is mounted at the very top-center of the tank.? There is a backup fire department repeater at the site on UHF.? I don’t even think it’s plugged in.

The tower also has 5G panels mounted all the way around the perimeter.

Given that space is not a consideration and all things being equal, which of the subject duplexers would you choose to put behind an MSR-2000 running 50 – 60 watts out of the PA?? I have experience with the WP-641, but not the Sinclair.

73,

Mike

WM4B
 

At 3/27/2025 03:27 PM, you wrote:

I have both of these duplexers available to replace an existing system.? The site itself is a water tower with an existing DB224 that has been made available to me.? It is mounted at the very top-center of the tank.? There is a backup fire department repeater at the site on UHF.? I don’t even think it’s plugged in.

The tower also has 5G panels mounted all the way around the perimeter.

Given that space is not a consideration and all things being equal, which of the subject duplexers would you choose to put behind an MSR-2000 running 50 – 60 watts out of the PA?? I have experience with the WP-641, but not the Sinclair.

I recommend the WP-641.

Bob NO6B

 

And the reason why the Ns have less notch?

Kit Parsons himself told me when I ordered my 220 652s in 1984. He sent a handwritten note with the invoice to my PO box...I had ordered with type Ns..he wrote "Chris, call me collect if you need to...they are better with UHF connectors!"?

So I called him in my dime lol ..he explained the notch in the BpBr depends on the height of the T above the cavity..Ns are taller than UHFs...he said if they could make the cable connection right on top of the can, they could see 110 to 120db notch vs 90 to 95 on the WP641s for example...he didn't like using BNCs which are shorter because of the loose fit of the bayonet.. TNC probably would have done it..but hey he was the engineer and owner. I wasn't going to argue ?

I sure miss Kit and WACOM...great customer service and I helped sell a lot of his products in SE TX..offered to represent WACOM at Dayton one time but Kit got back to me and said the lawyers said no... Ugh..and the LMR Expo was at the same time then..oh well?

Now you know the reeeeest of the story
(as one of my ex coworkers used to say)

Chris?


On Thu, Mar 27, 2025, 8:41 PM Kevin Custer via <kuggie=[email protected]> wrote:
The WACOM WP-641 provides 93 dB of rejection at 1.5dB of insertion loss at 600 kHz - if it's a UHF connector version.? If it's an N connector version the rejection is 91 dB or so (yes it's less).? It's easy to tune with simple equipment.? If the cavity interconnect cables say "Modified RG214" you should consider replacing that cable with real RG214/U.? While the cable supplied is double shielded - it's not silver plated.

The Sinclair Q2330e provides nearly 100dB of rejection at 1.5dB of insertion loss at 600 kHz.? This duplexer is considerably more difficult to tune, requiring a VNA (or RLB) to set the pass frequencies.

You don't state what your receive sensitivity is, or whether or not you're going to use a preamp.? If not - either duplexer is sufficient for the MSR-2000.? If you want more reserve isolation - use the Sinclair.

Kevin W3KKC

On 3/27/2025 6:27 PM, Mike Besemer - WM4B via wrote:

I have both of these duplexers available to replace an existing system.? The site itself is a water tower with an existing DB224 that has been made available to me.? It is mounted at the very top-center of the tank.? There is a backup fire department repeater at the site on UHF.? I don’t even think it’s plugged in.

The tower also has 5G panels mounted all the way around the perimeter.

Given that space is not a consideration and all things being equal, which of the subject duplexers would you choose to put behind an MSR-2000 running 50 – 60 watts out of the PA?? I have experience with the WP-641, but not the Sinclair.

73,

Mike

WM4B

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