Magnus Danielson wrote:
> From: "Robert Lutwak" <[EMAIL PROTECTED]>
> Subject: Re: [time-nuts] More on paralleling output gates
> Date: Sun, 9 Apr 2006 16:04:49 -0400
> Message-ID: <[EMAIL PROTECTED]>
>
>> I suspect you're just measuring the bandwidth of your 400 MHz oscilloscope.
>
> He is close
> I am sitting here and thinking "Hey, isn't those 3 x 50 Ohm sources in
> parallel a impedance missmatch?". If you have a sufficiently long
> system (> 1/12 of the risetime in cable-length which in this case
> would mean maybe 50 cm or so) we must consider it as an impedance
> system and thus we
From: "Robert Lutwak" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] More on paralleling output gates
Date: Sun, 9 Apr 2006 16:04:49 -0400
Message-ID: <[EMAIL PROTECTED]>
> I suspect you're just measuring the bandwidth of your 400 MHz oscilloscope.
He is close... tau of 1.1 ns should be expected fr
> I didn't convert the PECL signals, but instead went inside the unit
> andtapped off the 1pps and 10MHz signals. I have details at
> http://www.febo.com/time-freq/gps/z3801a/mods/index.html
You don't need to install the jumpers. If you look around, there are unused
0R slots near the ones you
I didn't convert the PECL signals, but instead went inside the unit and
tapped off the 1pps and 10MHz signals. I have details at
http://www.febo.com/time-freq/gps/z3801a/mods/index.html
John
Don Mimlitch said the following on 04/09/2006 08:41 PM:
> I have a HP Z3801A which outputs the 1 PPS
I have a HP Z3801A which outputs the 1 PPS and 10MHz as Differential Pseudo
ECL. What is this?
How do I access these signals? How do I convert them to TTL or CMOS Levels.
Are there any IC's (DIP Package) to do the conversion? For short cable runs (2
or 3 Ft.) is there a simple circuit fo
Robert Lutwak wrote:
>I suspect you're just measuring the bandwidth of your 400 MHz oscilloscope.
>
>
>
Usually the expected rise time for a 400MHz oscilloscope would be
0.35/bandwidth = 0.875ns, so although the scope bandwidth is limiting
the measuremens, seems that the 74ACT04 is a bit slowe
On Sat, 8 Apr 2006 13:53:40 -0700, "Tom Van Baak" <[EMAIL PROTECTED]>
wrote:
>PHK,
>
>So sorry to hear about your legal adventure.
>
>Have a close look at "NTP" from the 1930's -- at just
>5 cents a day [about $0.70 in today's dollar]:
>
>http://www.leapsecond.com/history/usno.htm
And I bet there
Poul-Henning Kamp said the following on 04/09/2006 04:07 PM:
> In message <[EMAIL PROTECTED]>, John Ackermann N8UR writes:
>
>
>>For what it's worth, the risetime of the MAX232 output is about 2.5us,
>>in a very smooth ramp -- it's spec'd at 4 v/us. I have heard that the
>>risetime is deliberate
Robert Lutwak said the following on 04/09/2006 04:04 PM:
> I suspect you're just measuring the bandwidth of your 400 MHz oscilloscope.
>
>
> -RL
That could well be, though since 74AC is supposed to have a slew rate of
2v/ns, I'm measuring not too far from what you'd expect -- and the main
goal w
In message <[EMAIL PROTECTED]>, John Ackermann N8UR writes:
>For what it's worth, the risetime of the MAX232 output is about 2.5us,
>in a very smooth ramp -- it's spec'd at 4 v/us. I have heard that the
>risetime is deliberately slow to match the RS-232 spec; I don't know
>whether that's true. T
I suspect you're just measuring the bandwidth of your 400 MHz oscilloscope.
-RL
Please note that I am now automatically deleting all Email originating from
"comcast.net"
due to the large amount of spam originating from their servers. Please
register your
complaints with ComCast, since they ha
I screwed up the measurements in the message I just sent. With the room
(and the trace) dimmed for photography, I messed up getting the trace
properly aligned for risetime measurements. I didn't notice until too
late. There won't be a major difference in the results, but I'll
remeasure (and reph
Poul-Henning Kamp said the following on 04/09/2006 02:07 AM:
> No, I don't think so. But I've since found out that the abuse
> pretty much all stratum 1 servers, including several .edu, .gov
> and .mil servers.
>
> Now they probably regret they didn't just pay off my claim from the
> start.
I'm
Hi Christopher,
I have a copy of Op & Sev manual PN 19179D Jun.1975 that includes
schematics, unfotunately I don't have PDF format.
Best regards,
M. Tsuchiya
JA2GXU
- Original Message -
From: "Christopher Hoover" <[EMAIL PROTECTED]>
To:
Sent: Saturday, April 08, 2006 5:47 AM
Subjec
Hi Allan,
I have a original Op & Sev manual PN 14164D Sep.1976 and have
PDF 29.5Mb but unfortunately I don't use ADSL depend on EMI
problem.
M. Tsuchiya
JA2GXU
- Original Message -
From: "Allan W. Bart, Jr." <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measureme
16 matches
Mail list logo
