___
> From: time-nuts [time-nuts-boun...@lists.febo.com] on behalf of Perry Sandeen
> via time-nuts [time-nuts@lists.febo.com]
> Sent: Wednesday, March 20, 2019 23:50
> To: time-nuts@lists.febo.com
> Cc: Perry Sandeen
> Subject: Re: [time-nuts] Distribution amplifier
ebo.com
Cc: Perry Sandeen
Subject: Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps
Yo Bubba Dudes!
Wrote:
Gosh. This topic comes up at least once every 6 months. Adiligent search of the
time-nuts database would turn up amazing things. . .
Yep, it does and it always will for at least t
Yo Bubba Dudes!
Wrote:
Gosh. This topic comes up at least once every 6 months. Adiligent search of the
time-nuts database would turn up amazing things. . .
Yep, it does and it always will for at least two reasons.
One, we have new people joining the list. Which is great. They're at the
beginnin
2019 20:00:57 +0200
>From: Anders Wallin
>To: Discussion of precise time and frequency measurement <
time-nuts@lists.febo.com>
>Subject: Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps
>Message-ID:<
capnvnrwzqjwhlhhrcntlab-kpbm6jon8aiowq9g5--aut_9...@mail.gmail.c
Hi
CMOS is what you want rather than TTL in this day and age. Propagation delay
and jitter are
both much better than any of the TTL families.
NC7SZ125:
Prop delay 2.6 ns
Output high 50 ma max 32 ma rated
Output low 50 ma max 32 ma rated
(rated = ~0.5V off rail at 4.5V supply)
74S140
Prop d
The 74S140 (dual 4-input NAND) is the classic TI TTL 50-ohm driver.
They're still available in DIP & SOIC.
I'm currently waiting on some boards to arrive so I can try SN74LVC1G17
as a more modern replacement that's much cheaper and smaller.
Once I've proven it I'll do a separate thread to the lis
Hi
CMOS is good. The faster the better. Go to your favorite vendor and find
whatever is “king” this month
and that’s what you go with. HC has been around a *long* time and is about as
slow as it gets in terms
of 5V CMOS ( yes, 4000 series is slower still …). Faster means less delay in
the gat
Hi
Yup, pretty much the same questions each time. I’ve given up recommending
specific IC’s since the DIY approach does not seem to be what people are after.
That’s not a problem, I do a *lot* of stuff on a “what’s on eBay?” basis.
Bob
> On Mar 17, 2019, at 4:56 PM, djl wrote:
>
> Gosh. this t
I'm very curious, too. Especially when I *just* built one using 74HC04N.
---
(Mr.) Taka Kamiya
I'm stuck in a wormhole Hello, worms!
On Sunday, March 17, 2019, 4:01:26 PM EDT, Hal Murray
wrote:
> For 1PPs the main goal is jitter and the se
Gosh. this topic comes up at least once every 6 months. A diligent
search of the time-nuts database would turn up amazing things. . .
On 2019-03-17 13:24, Hal Murray wrote:
For 1PPs the main goal is jitter and the selection of the ICs is very
tricky
Could you please say more? Do you mean lo
Yes :-) another one of mine:
< http://www.hoffmann-hochfrequenz.de/downloads/iso_amp.pdf >
It is based on a NIST design and made from discrete transistors.
Unfortunately it also needs RF PNP transistors that are slowly going the
way of the Dodo.
Luckily, I still have a reel of BFG31.
> For 1PPs the main goal is jitter and the selection of the ICs is very tricky
Could you please say more? Do you mean logic family selection, or chip
selection within a family?
Most modern digital chips are CMOS with an input threshold of VCC/2. I'd
expect power supply noise to be importan
I've tried to collect links to frequency/pulse distributor designs over
here:
https://www.ohwr.org/project/pda-8ch-fda-8ch/wikis/Similar-Projects
if something good is missing let me know!
AW
>
> > But how do I do this
> on 10MHz side? I'd like to have minimal distortion
> (sine wave) and hi
the selection of the ICs is very tricky
On Sun, 3/17/19, Joakim Langlet wrote:
Subject: Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps
To: "Taka Kamiya via time-nuts"
Date: Sunday, March 17, 2019, 7:55 AM
Hi,
I used a mono
I modified a analog video distribution amp. Worked well. Changed the impedance
by changing resistors at the outputs. I put my True Position GPSDO in the case,
along with a power supply and microcontroller, and LCD display. I used the
R-G-B outputs for 10MHz, and the digital audio for the 1PPS
: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps
On Sat, 16 Mar 2019 18:01:36 + (UTC)
Taka Kamiya via time-nuts wrote:
> But how do I do this on 10MHz side? I'd like to have minimal distortion
> (sine wav
On Sat, 16 Mar 2019 18:01:36 + (UTC)
Taka Kamiya via time-nuts wrote:
> But how do I do this on 10MHz side? I'd like to have minimal distortion
> (sine wave) and high isolation. I acquired a few signal splitter and
> monolithic amplifiers. Split first and amplify? Amplify first and spli
Hi
If you dig into the archives there are a lot of approaches to this. A few
options:
1) Use an eBay video distribution amplifier
2) Use an amp (possibly MiniCircuits) and drive a power splitter
3) Use one of the (again eBay) boxes specifically designed to do this
4) Wire up a DIY board with
In the TV station we used video distribution amplifiers.
These were one amplifier that fed 8 75 Ohm resistors.
These were one in eight out amplifiers.
The other end of the resistor went to a BNC connector.
Each unused port we terminated with a 75 Ohm load.
I think I can provide schematics if you
Hello
I am thinking about distribution amplifier of a sort. Not a kind with 8 or
more output but just 2 or 3.
As you know, most timing equipment comes with just one output of a kind. Say
one 10MHz and 1 PPS. This is rather inconvenient. If I want to scope it
without disturbing the setu
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