Re: WACOM WP-641 vs. Sinclair Q2330E
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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?
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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Chris Boone WB5ITT