Going on recollection. Now I’ll have to go look again.
> On Oct 23, 2017, at 17:06, Jeremy Elson wrote:
>
>> On Mon, Oct 23, 2017 at 1:49 PM, Bob Bownes wrote:
>>
>> Will it work? Probably. Up to a point.
>>
>> Is is best practice? Not even close.
>>
>> Each device will (should?) generally
On Mon, Oct 23, 2017 at 1:49 PM, Bob Bownes wrote:
> Will it work? Probably. Up to a point.
>
> Is is best practice? Not even close.
>
> Each device will (should?) generally present a 50Ω termination. In the case
> of instruments that provide their own ref output which is then looped back
> in, t
Is there an easy way to measure the per-device load, or do you typically
just go by whatever the datasheet says?
I suppose I could just hook everything up and then check the amplitude of
the signal at the far end.
On Mon, Oct 23, 2017 at 1:43 PM, John Ackermann N8UR wrote:
> To some extent, it
Hi
The only other thing to consider is switching stuff on and off. A distribution
amplifier or a
tap system gives you some isolation between devices. One can go short circuit
or back
feed a noise burst and the others will not be impacted.
Does this matter? In a lot of cases the answer is no.
On 10/23/2017 04:52 PM, Hal Murray wrote:
But if any of the EXT REF are low-z inputs, that won't work so well.
Unless there is only one. Then you can use it as the last one and you don't
need the explicit terminator.
Good point.
___
time-nuts maili
Will it work? Probably. Up to a point.
Is is best practice? Not even close.
Each device will (should?) generally present a 50Ω termination. In the case
of instruments that provide their own ref output which is then looped back
in, they may be different, but I don't recall seeing any that said any
> But if any of the EXT REF are low-z inputs, that won't work so well.
Unless there is only one. Then you can use it as the last one and you don't
need the explicit terminator.
--
These are my opinions. I hate spam.
___
time-nuts mailing list --
To some extent, it depends on the load presented by each device. The
"EXT REF" input on many pieces of test equipment is fairly high
impedance (maybe 10k?) and you can drive several of those with a single
output, putting a 50 ohm load at the end of the line to provide a
reasonable termination.
I was about to ask a related question of the list: when do you need a
distribution amplifier, and when is it sufficient to just have a single
(linear) run of coax?
I have a GPSDO (Nick Sayer's device) that I want to use to feed a few other
pieces of equipment in my lab (an HP5335A, John Ackermann'
Hi
The correct answer to any real question like this is “that depends”.
For anything that I normally run as test gear, noise outside a very narrow
bandwidth really
does not matter much. The test gear *assumes* (by design) that the reference
signal going
into the “ref in” jack is not very cle
List -- Don is having email trouble, but here's his posting:
--
From: donaldbcol...@gmail.com
Date: Tue, Oct 24, 2017 at 1:38 AM
Subject: Distribution divider/amplifier for 10MHz GPSDO
Hello group. I`m intending to distribute, via 50 Ohm coax, frequency
reference signals to my test equ
11 matches
Mail list logo
