LPRO have an high 10Mhz phase noise; if you want a rubidium, FRK is better
than LPRO but I suggest the Trimble or HP GPS freq standard.
Luciano P. S. Paramithiotti
IZ5JHJ
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of J. L.
Hi Luciano,
Thank You for the information, it will help me to decide on what to get.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Paramithiotti, Luciano Paolo S luciano.paramithio...@hp.com
To: Discussion of precise time
On 9/30/2010 12:43 PM, Alan Melia wrote:
Mark to my inexpert eye that doesnt look like a very good overtone
oscillator but I appreciate that it is slimmed down to keep the weight and
size down, I can see why it is touchy. There is nothing to make the
oscillator degenerate at the crystal
This type of circuit is NOT a free running oscillator. It is a type of
blocking oscillator that generates a short, high powered ping every second or
two. It is designed to be able to extract every bit of power out of the
battery. It can run for over a month off of a couple of button cells,
Hi Mark looking at the M15m article where the design seems to stem from
suggests that the oscillator is NOT opertaing on 150 or 200 MHz but in fact
40 to 50 Mhz with a cheap crystal and the LC collector circuit is selecting
the the 3rd or 5th harmonic (not overtone a common mis-apprehension) The
Fellow time-nuts:
I've got a circa 1964 DY-5842 VLF receiver. This is (was) operated in
conjunction with an external time interval counter to make a frequency
comparison. So you would select WWVL for example, and use that as your
primary standard for comparison to your local standard. It's got 5
I am very interested. Do you have any images?
John Franke WA4WDL
Portsmouth, VA 23703
--
From: ziggy9 zig...@pumpkinbrook.com
Sent: Friday, October 01, 2010 6:34 PM
To: time-nuts@febo.com
Subject: [time-nuts] Possibly OT - Any interest in a
You might consider contacting Dr. Ken Kuhn -- kennathak...@gmail.com
check his HP museum at http://www.kennethkuhn.com/hpmuseum/
Brian Kirby KD4FM
On 10/1/2010 5:34 PM, ziggy9 wrote:
Fellow time-nuts:
I've got a circa 1964 DY-5842 VLF receiver. This is (was) operated in
conjunction with
Mark Sims wrote:
This type of circuit is NOT a free running oscillator. It is a type
of blocking oscillator that generates a short, high powered ping
every second or two. It is designed to be able to extract every bit
of power out of the battery. It can run for over a month off of a
couple
Nope, nothing special about the stability requirements. Hopefully the freq
won't drift off channel (receivers are usually fixed freq or channeled at
10-50KHz with a VFO tweaker cap to allow some offset adjustment within the
channel). They are usually highly optimized for sensitivity (
I've received a few expressions of interest. So I've put up a few
pictures at http://www.pumpkinbrook.com/DY-5842/ , just the front,
back, and top views. When I received this, there was no top or back
panel, I didn't remove them for the pictures. In those pictures,
you'll see that there's
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