Hello Time Nuts,
Maybe this should be added to this thread - this page is actually pretty
good:
https://en.wikipedia.org/wiki/WWVB
73's,
John
AJ6BC
On Tue, Oct 13, 2020 at 12:50 PM John C. Westmoreland, P.E. <
j...@westmorelandengineering.com> wrote:
> Hello Time Nuts,
>
> Paul, I haven't gon
One of the problems with the iMX RT series, is that any processor below the
1064 (Teensy 4.0 and 4.1 use 1062) do not have any internal FLASH. It is
all external in a separate FLASH chip sitting out there waiting to be read
by your competitors. So, the iMXRT has a bunch of boot time complexity,
opt
Hi
Oven supply sensitivity and oven temperature sensitivity are two different (and
independent) aspects of the oscillator. One magnitude of one parameter does not
predict the magnitude (or direction) of the other parameter. Indeed changes in
either voltage or temperature will have an impact, th
I don't know what a timepod is in this context.
The only reason you'd need a 17dBm drive mixer if if you'd exceed the RF
or LO port input level of the SRA-1. (Clean) square wave drive for a
diode ring mixer is /preferred/.
Oz (in DFW, Texas)
On 10/17/2020 7:59 AM, Gerhard Hoffmann wrote:
>
>
>
Hi
I’m not quite sure I understand the "2 DIL 80 MHz-oscillators” part.
If you have the power divider, isn’t one oscillator going to do the job?
=
Isolation between the two channels can turn into a bit of a nightmare …..
Bob
> On Oct 17, 2020, at 8:59 AM, Gerhard Hoffmann
> wrote:
>
>
The teensy arrived and was easily installed in the arduino IDE. Worked
right off the bat.
The wiring of the A/D and the TFT display is a bit less clear. I have all
of the details but need to go over them carefully. The teensy 4.0 is
slightly different in the pins used as compared to the various
doc
FWIW, I have done PN measurements at 144 MHz with the TimePod and a
Frankenstein's laboratory lashup of 80 MHz ULN, HP doubler to 160 MHz,
HP mixer, and several amp and filter blocks. As far as I can tell, it
worked pretty well; at least, I could discern the PN difference among
several sources
Hi
The TimePod is a measurement device designed by John Miles. It will accept
an input up to just above 30 MHz. If you want to look at something above
that frequency, you need a downconverter. The TimePod will handle inputs
up into the 15 to 20 dbm range. If one wished to preserve this capability
Hi
I would *think* that the phase noise out of the down converter channel would be
the DUT + LO. If indeed you
have DUT A + LO B and DUT C + LO D, you then have a lot of A + B vs C + D stuff
to sort out ….
Bob
> On Oct 17, 2020, at 2:48 PM, John Ackermann N8UR wrote:
>
> FWIW, I have done PN
Thanks for your response Bob.
In my implementation, the OCXO has two supply inputs -
one for the Oscillator, +18V and one for the Oven , +24V. They are both
linear regulators, but fed from the same +32V DC unreg source.
The EFC voltage consists of two parts, a -7V fixed supply, derived from and
Ana
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of
> Gerhard Hoffmann
> Sent: Saturday, October 17, 2020 5:59 AM
> To: time-nuts@lists.febo.com
> Subject: [time-nuts] Fwd: cheap frequency extension for timepod
> . . .
> I have 2 17 dBm SRA1-WH, but
Hi
(see below)
> On Oct 17, 2020, at 4:22 PM, Joe & Gisela Noci wrote:
>
> Thanks for your response Bob.
> In my implementation, the OCXO has two supply inputs -
> one for the Oscillator, +18V and one for the Oven , +24V. They are both
> linear regulators, but fed from the same +32V DC unreg so
Hi Bob.
I do appreciate you taking the time to read my lengthy stories and helping
enlighten me!
I am very green with respect to this subject and the underlying physics,
but it remains a fascinating challenge.
From your comments I realise that I may in fact be inventing issues because
of my lack o
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