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Author Topic: Combiner quality  (Read 4462 times)

Andrew Broughton

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Re: Combiner quality
« Reply #20 on: April 16, 2018, 03:21:04 am »

Chris of RF Venue via email (I was asking questions) said their inputs are 100mw capable.
Not really sure what that means.
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Nathan Riddle

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Re: Combiner quality
« Reply #21 on: April 16, 2018, 08:18:04 am »

Not really sure what that means.

It's not a listed spec on their spec sheet, so I figure when comparing the units with spec sheets that is a worthy addition.
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Andrew Broughton

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Re: Combiner quality
« Reply #22 on: April 16, 2018, 02:47:48 pm »

It's not a listed spec on their spec sheet, so I figure when comparing the units with spec sheets that is a worthy addition.
Gotcha, thanks!
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-Andy

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Don Boomer

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Re: Combiner quality
« Reply #23 on: April 16, 2018, 08:52:13 pm »

It's not a listed spec on their spec sheet, so I figure when comparing the units with spec sheets that is a worthy addition.

Check again, itís on the spec sheet😁
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Don Boomer
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Andrew Broughton

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Re: Combiner quality
« Reply #24 on: April 17, 2018, 03:00:21 pm »

Other than the RF venue being 4ch and the others 8ch, it's MUCH less expensive (like 1/8th the price). I would love to know what specifically is different. No doubt an 8ch unit is more difficult to build than 4ch, but still?
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-Andy

"Well, my days of not taking you seriously are certainly coming to a middle..."

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Nathan Riddle

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Re: Combiner quality
« Reply #25 on: April 17, 2018, 03:17:54 pm »

Check again, itís on the spec sheet😁

Apologies  :-[ I could have sworn it wasn't  :o I should have double checked my memory with facts ;)
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frank kayser

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Re: Combiner quality
« Reply #26 on: April 18, 2018, 12:36:22 pm »

So all this discussion begs the question:
What specifically is (are) the problem(s) using a generic splitter/combiner if it covers the frequency range (350-1000mhz) and as a combiner, can handle the power input from the transmitters.
For example:
https://www.instockwireless.com/rf_power_divider_combiner_splitter/pd2581-datasheet.pdf


Other non-pro sound sites claim anything covering the TV range work - reliably enough for "A" level? No.  OK for bargain basement lounge use?  I know: risk vs reward.  Buy once, cry once.


frank
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Scott Holtzman

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Re: Combiner quality
« Reply #27 on: April 18, 2018, 01:44:20 pm »

So all this discussion begs the question:
What specifically is (are) the problem(s) using a generic splitter/combiner if it covers the frequency range (350-1000mhz) and as a combiner, can handle the power input from the transmitters.
For example:
https://www.instockwireless.com/rf_power_divider_combiner_splitter/pd2581-datasheet.pdf


Other non-pro sound sites claim anything covering the TV range work - reliably enough for "A" level? No.  OK for bargain basement lounge use?  I know: risk vs reward.  Buy once, cry once.


frank

The wide bandwidth does not provide for filtration.  You could add bandpass filters on the outputs but that would increase the cost.  The problem is that is after the internal amplifier.  You could also build a custom network of preselectors with the same caveat.

Lack of filtration on a wideband amplifier is just asking for intermod products. 

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Jason Glass

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Re: Combiner quality
« Reply #28 on: April 18, 2018, 01:52:10 pm »

The wide bandwidth does not provide for filtration.  You could add bandpass filters on the outputs but that would increase the cost.  The problem is that is after the internal amplifier.  You could also build a custom network of preselectors with the same caveat.

Lack of filtration on a wideband amplifier is just asking for intermod products.
They also lack sufficient isolation between ports. Good wide band passives typically spec around 25dB.

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Andrew Broughton

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Re: Combiner quality
« Reply #29 on: April 18, 2018, 02:21:07 pm »

Again, I still don't understand how the 8ch devices are over $5k each and the 4-channel devices that are sub-$1k? The Sennheiser AC-3 and RF Venue Combine-4 are 6-8 times cheaper.
What are the "real-world" differences that justify the huge increase in cost?
If you're only using 4 channels, do they perform the same? If you use 2 of the 4-channel units for 8 channels with antennas spaced apart, does that work as well as a single 8ch?
« Last Edit: April 18, 2018, 02:24:14 pm by Andrew Broughton »
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