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USA Made GPS Disciplined Oscillator

dlwtrunked

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We have a Spectracom GPSDO and distribution amp at our club site. All our repeaters, except D-Star, 1.25m and 6m are disciplined.
I also have GPSDO distribution amps. I think I have two brands. The one I have in my hand now (a x4 multii-coupler) d
For those who do not know, the distribution amp is a multi-coupler for the 10 MHz clock output. These usually output sine wave regardless of whether square or sine input. Generally this will not make a noticeable difference.
 

AM909

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Is a distribution amp necessary for just two or three devices, like a monitor and a freq counter? Are the reference inputs normally 50 ohms or some high impedance? If concerned about over-loading, can I just resistively match a +13 dBm 50-ohm GPSDO output with 25 ohms in series to get 2x +7 dBm or 33 ohms to get 3x +3.5 dBm, etc.?
 

tlemke940

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normally what i have been seeing is just using T connectors for that few devices it more than anything comes down to how many devices and do you want to be in the PPM or PPB depending on the unit. for most cases a T connector will work fine.if you are doing more than a few devices you may need a distribution amp.
 

dlwtrunked

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Is a distribution amp necessary for just two or three devices, like a monitor and a freq counter? Are the reference inputs normally 50 ohms or some high impedance? If concerned about over-loading, can I just resistively match a +13 dBm 50-ohm GPSDO output with 25 ohms in series to get 2x +7 dBm or 33 ohms to get 3x +3.5 dBm, etc.
Good questions. I generally have separate GPSDO for each use as they are spread out and I move them around. Most setups are 50 ohm I believe and square of sine wave are usually OK except I think I have seen some interface circuits for early SDRplay models. I would use a multi-coupler rather than messing with resistors.
Bodnar is 50 ohm
 

kayn1n32008

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Is a distribution amp necessary for just two or three devices, like a monitor and a freq counter? Are the reference inputs normally 50 ohms or some high impedance? If concerned about over-loading, can I just resistively match a +13 dBm 50-ohm GPSDO output with 25 ohms in series to get 2x +7 dBm or 33 ohms to get 3x +3.5 dBm, etc.?
At our site, we have 3 digital repeaters, 2 analogue repeaters, ECCC Weather radio and a couple service monitors as well.

The DA gives a clean, known amplitude, for all 12 ports.
 
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