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A preselector is simply a band pass filter. A splitter is….. a splitter.

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Matt

AL0R

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From: [email protected] <[email protected]> On Behalf Of Jason Weisberger via groups.io
Sent: Thursday, April 3, 2025 18:21
To: [email protected]
Subject: Re: [repeater-builder] UHF Repeater Input Frequency Issues

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On Thu, Apr 3, 2025 at 01:04 PM, Charles Adams wrote:

Jason
Just curious, why do you have an eight way splitter in line to the receiver. The preamp is there to offset the loss in the splitter. Try eliminating both, but not the preselector.
Charles Adams
Industrial Communications Co.
Mobile 610-360-0050?
Office 610-253-1214?
cadams@...
From: [email protected] <[email protected]> on behalf of Jason Weisberger via groups.io <jason@...>
Sent: Thursday, April 3, 2025 3:30:12 PM
To: [email protected] <[email protected]>
Subject: Re: [repeater-builder] UHF Repeater Input Frequency Issues
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On Thu, Apr 3, 2025 at 12:17 PM, Mike wrote:
I'm curious what the 8-way divider was feeding in addition to the DR-2X??
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That 8-way split was integrated into the Sinclair Preamp.? See attached pic.
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Can you please elaborate on preselector vs splitter?? I assume you're calling a splitter what I've been calling a preamp sure to the split output.? Is a preselector then a receive amp without the integrated split?

#214291

On Thu, Apr 3, 2025 at 06:49 PM, Matt wrote:

A preselector is simply a band pass filter. A splitter is….. a splitter.

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Matt

AL0R

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From: [email protected] <[email protected]> On Behalf Of Jason Weisberger via groups.io
Sent: Thursday, April 3, 2025 18:21
To: [email protected]
Subject: Re: [repeater-builder] UHF Repeater Input Frequency Issues

?

On Thu, Apr 3, 2025 at 01:04 PM, Charles Adams wrote:

Jason

Just curious, why do you have an eight way splitter in line to the receiver. The preamp is there to offset the loss in the splitter. Try eliminating both, but not the preselector.

Charles Adams

Industrial Communications Co.

Mobile 610-360-0050?

Office 610-253-1214?

cadams@...

From: [email protected] <[email protected]> on behalf of Jason Weisberger via groups.io <jason@...>
Sent: Thursday, April 3, 2025 3:30:12 PM
To: [email protected] <[email protected]>
Subject: Re: [repeater-builder] UHF Repeater Input Frequency Issues

?

On Thu, Apr 3, 2025 at 12:17 PM, Mike wrote:

I'm curious what the 8-way divider was feeding in addition to the DR-2X??

?

?

That 8-way split was integrated into the Sinclair Preamp.? See attached pic.

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Can you please elaborate on preselector vs splitter?? I assume you're calling a splitter what I've been calling a preamp sure to the split output.? Is a preselector then a receive amp without the integrated split?

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Thanks.? I come from the CATV world prior to ham radio.? The splitter terminology is very familiar, but every little corner of the RF world uses just slightly different language at times.? Was just checking.?

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I wouldn't have guessed that a preselector was a bandpass instead of an active device.?

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Thanks for all the great info folks.? We're on the right track now.

#214293

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Unlike the CATV world, where splitters are common and a splitter can have a variety of different drop/tap levels, splitters are not as frequently used, and when they are, the are usually referred to as power dividers. The goal being, equal division of power to two or more antennas. Additionally, “splitting” requires attention to impedance.

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If you find what appears to be a “4 port splitter” at a ham fest, it probably isn’t. Generally these are a hybrid, used to combine amplifiers or perform a 90 degree phase shift (for circular polarization.) Similarly, at a recent fest I found a single load isolator (3 port) with no labeling that was tagged “splitter” by the seller. So be cautious if you don’t know exactly what a device is – many do not.

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