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VHF Quantar Duplexer 600KHz?

This forum is for discussions regarding System Infrastructure and Related Equipment. This includes but is not limited to repeaters, base stations, consoles, voters, Voice over IP, system design and implementation, and other related topics.

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escomm
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VHF Quantar Duplexer 600KHz?

Postby escomm » Wed Nov 29, 2017 4:21 pm

Manual says something like 200KHz of bandwidth at 1.5MHz separation and 600KHz of bandwidth at 2.5MHz separation. Has anyone used them on a 600KHz split and how was the insertion loss and other performance?

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chartofmaryland
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Re: VHF Quantar Duplexer 600KHz?

Postby chartofmaryland » Fri Dec 01, 2017 9:13 am

Afternoon Escomm,

When you are speaking of the bandwidth, are you asking about the bandpass bandwidth of the high and low side of the duplexer?

The minimum seperation between transmit and receive frequencies will always stay at 1.5 Mhz Tx to Rx or 2.5 Mhz Tx to Rx.

The flat pack duplexer from Fingu is lacking the Q to perform at 600 Khz Tx to Rx frequency spacing.

We have tuned a few to try and the best we could run with around 2 dbm desense was 3 watts on transmit while still getting -119 dbm on receive.

CoM
If the lights are out when you leave the station and then come on the second you key up, you know you have enough power.

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escomm
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Re: VHF Quantar Duplexer 600KHz?

Postby escomm » Sat Dec 02, 2017 8:18 am

Sorry I was talking about the rack mount one. I think the current part number is 9175300H02

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Astro Spectra
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Re: VHF Quantar Duplexer 600kHz?

Postby Astro Spectra » Sat Dec 02, 2017 9:54 am

Hi escomm, that set of cans has a minimum t to r split of about 1.2 MHz. It's a bandpass-bandpass design. At the narrowest spacing the pass band is about 100 kHz aside , meaning the width of the high and low pass bands.

It's not big enough really for the ham split, you need something with 'more can' i.e. larger cavities. My favourite is the Sinclair Q2220. My other favourite is Nobu at Ceasers :)

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escomm
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Re: VHF Quantar Duplexer 600KHz?

Postby escomm » Mon Dec 04, 2017 11:58 am

Holy crap, that thing is not BP/BR???

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Astro Spectra
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Re: VHF Quantar Duplexer 600KHz?

Postby Astro Spectra » Mon Dec 04, 2017 12:16 pm

There is a notch set by the a small tuning cap but from memory it's shallow at only 30 to 40 dB at the narrow splits, deeper at the wide splits. Because the main elements are electrically shortened the notch performance is not great.


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