xaos wrote:

George

Look at schematic for 10544A:

http://www.leapsecond.com/museum/10544/10544-3.gif

As long as the varicap is reverse biased only the dc load on the EFC
input is diode leakage.

Bruce

While it is difficult to read the resistor values on that schematic (and as
Bruce points out not really relevant as the diodes are reverse biased), it
appears that since the varicap is referenced to ground, the 10544A's EFC is
always positive. The 10811A goes from -5 to + 5 as the cathode end of the
diode is referenced to +6.4 volts. All this time I had thought they were
fairly interchangeable. - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960

-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Bruce Griffiths
Sent: Sunday, October 28, 2007 9:53 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] EFC Input pin impedance for the HP 10544A
and10811-6011

); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com@febo.com RETRY

xaos wrote:

George

Look at schematic for 10544A:

http://www.leapsecond.com/museum/10544/10544-3.gif

As long as the varicap is reverse biased only the dc load on the EFC
input is diode leakage.

Bruce

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Mike Feher wrote:

Mike

Get yourself a better GIF viewer and magnify the image (all component
values can then be read), you will find there is an option to connect
the varicap cathode to +6.4V just like the 1081.
The problem only arises if one has the other option.

Bruce

Bruce Griffiths wrote:

The 1972, 1976 and 1975 datasheets specify an EFC range of -5V to +5V so
connecting the EFC varicap cathode to +6.2V would appear to be the standard.
Other specs like the power supply current specs change dramatically in
the 1976 datasheets.

There are also 10544A and 10544C variants which have dc oven controllers
rather than the switching oven controller of the 10544A.
The phase noise floor of these is about 20db lower than for the 10544A.

Bruce

I scanned that as a 3200x1600 high-resolution GIF file. If you
use modern versions of IE, you have to click on the image to
put it back to original scale (IE shrinks large images without
asking you first). Someone that knows html well can tell me how
to present oversized image files that IE won't take liberties with.

R5 and R6 on either side of the varicap are 20k each.

/tvb

Tom Van Baak wrote:

Tom

The opposite effect is sometimes desirable to force a browser to display
an image (usually a JPEG) to display on whatever resolution screen is in
use.
Any suggestions?

Bruce

Thanks Tom - I never realized that clicking on the image will magnify it.
Now I can see it just fine. - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960

-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Tom Van Baak
Sent: Sunday, October 28, 2007 10:56 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] EFC Input pin impedance for the HP
10544Aand10811-6011

); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com@febo.com RETRY

I scanned that as a 3200x1600 high-resolution GIF file. If you
use modern versions of IE, you have to click on the image to
put it back to original scale (IE shrinks large images without
asking you first). Someone that knows html well can tell me how
to present oversized image files that IE won't take liberties with.

R5 and R6 on either side of the varicap are 20k each.

/tvb

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To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Firefox does a pretty reasonable job at that.  When I click on Tom's
10544A's .gif link, it defaults to 1:1 resolution with horizontal and
vertical scroll bars.  If I click on the image it downscales to fill the
browser window.

IE7 seems to give me the same functionality if I select Tools->Internet
options->Advanced->Multimedia->Enable automatic image resizing.  That is
new, I believe; I'd always left that option disabled in previous versions
because it didn't make it so easy to view an image at 1:1.

-- john, KE5FX

Tom Van Baak wrote:

Tom

On my Linux machine:
Epithany defaults to full size and clicking on the image shrinks it to
fit the screen.
Opera defaults to full size and one has to use the menu system to shrink it.
Konqueror defaults to fitting the image to the window, the menus system
allows it to be displayed full size.
Seamonkey defaults to full size with navigation bars, clicking on the
image shrinks it to fit the window.
Firefox defaults to fitting the image to the window and clicking on it
dispalys it full size with navigation bars.

Bruce

On Mon, 29 Oct 2007 16:08:11 +1300, Bruce Griffiths bruce.griffiths@xtra.co.nz
wrote:

In Firefox, one can install the Image Zoom extension and then just roll the mouse
wheel to enlarge or shrink images.

My more general solution for viewing and printing high res images is to right click
on the image, "copy image" to the clipboard and then past it into Irfanview,
http://www.irfanview.com/, the best darn image/multimedia viewing and minor editing
software available.  Especially for printing, IrfanView does a remarkable job.

A copied image can, of course, be pasted into Corel, PhotoShop, etc., and manipulated
but Irfanview is fast and complete.

John

John De Armond
See my website for my current email address
http://www.neon-john.com
http://www.johndearmond.com <-- best little blog on the net!
Tellico Plains, Occupied TN
I didn't claw my way to the top of the food chain to eat vegetables!

Neon John wrote:

John

I have the opposite problem, whilst I can almost always view images
satisfactorily with any of the browsers I have, its just when someone
from who knows where views images on the website when one has no idea
what browser they are using.
How does one ensure that they will see the entire image when their
window and/or screen may have relatively low resolution?
I would like to avoid placing a tutorial on how to make best use of
whatever browser they may be using on the website if that is at all
possible.

Bruce

On the Macintosh platform, GraphicConverter provides that
functionality.  It is shareware, but very cheap, and has been under
constant development for, oooh, over a decade.  The author, Thorsten
Lemke, readily provides support. </end-advert> :-)

Hi Bruce,

You could force the browser to display the image at a small 

preview size by giving explicit width and height dimensions, and
include the image within a link to itself so that it can be viewed
full-size or downloaded.  For example:

<a href="large_image.gif"><img src="large_image.gif" width="320" height="240" alt="Big image - click to view full-size or download"></a>

(That should be one long line - I hope the system doesn't apply
confusing line-wrapping.  But of course extra line-splits are treated
just as any other white-space by HTML viewers, so it makes no
difference if the line is split.)

Regards,

	Peter