Re: [time-nuts] Anyone looking for HP 5060A parts/modules?

[Bob Camp]

Hi

My guess is that a “complete except for the tube” 5060A is a pretty common 
item. 
The tubes are basically an un-obtainable item (in good working order). 

Bob

> On Oct 12, 2016, at 11:04 AM, Don Lewis  wrote:
> 
> Skip...
> 
> Would there be enough parts to make one whole unit???
> 
> Even if it had problems, ..it could be the basis of a future working unit for 
> me.  ??
> 
> I'll pay shipping for all the parts, if that is a reasonable request/ offer.
> 
> Thank you
> 
> -Don
> 
> Don Lewis
> N5CID
> 
> 
> 
> 
> -Original Message- From: Skip Withrow
> Sent: Tuesday, October 11, 2016 2:51 PM
> To: time-nuts
> Subject: [time-nuts] Anyone looking for HP 5060A parts/modules?
> 
> Hello time-nuts,
> 
> I have acquired three boxes of modules and parts to Hewlett-Packard 5060A
> cesium standards.  As I don't have one of these units they are excess to my
> needs.  Don't know if anyone still has one of these units ticking as they
> are quite old and cesium tubes have probably long expired.  However, if you
> do have a need let me know and I will see if I can help.
> 
> Please contact me off lest.
> 
> Regards,
> Skip Withrow
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Re: [time-nuts] For those that insist on using switching power supplies

[Bob Stewart]

I've actually got 10 or 12 of those sitting in a box.  I got them because of 
the "grounded" power header.  The units I got used the 3-pin header but only 
had a 2-wire plug.  So, something seemed wrong and I opened it up.  I noticed 
the same thing: that the non-soldered ground pin went nowhere.  But, I demanded 
my money back due to the power cord not being as pictured, and went back to my 
previous supplier of a different power unit.  Since it was from China, it 
wasn't economic to ship them back.  It may be that ebay actually paid for the 
refund, I don't remember.  The build quality was pretty poor, and that figures 
since it had a screw-together clamshell.


Bob

  From: Bryan _ 
 To: Discussion of precise time and frequency measurement  
 Sent: Wednesday, October 12, 2016 3:42 PM
 Subject: Re: [time-nuts] For those that insist on using switching power 
supplies
   
And this one to show how safe and well designed they are.


https://youtu.be/g-NQSNoWlZ4



-=Bryan=-



From: time-nuts  on behalf of Pete Lancashire 

Sent: October 12, 2016 10:58 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] For those that insist on using switching power supplies

Although this link

http://www.righto.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.html
A dozen USB chargers in the lab: Apple is very good, but not quite the 
best
www.righto.com
When you buy a USB charger, how do you know if you're getting a safe, 
high-quality charger for your money? You can't tell from the outside...




is about the little Line to 5V USB adapters one sees everywhere now days,
it does show how crappy the output looks when one gets a 'bargin'

-pete
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Re: [time-nuts] For those that insist on using switching power supplies

[Bryan _]

And this one to show how safe and well designed they are.


https://youtu.be/g-NQSNoWlZ4



-=Bryan=-



From: time-nuts  on behalf of Pete Lancashire 

Sent: October 12, 2016 10:58 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] For those that insist on using switching power supplies

Although this link

http://www.righto.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.html
A dozen USB chargers in the lab: Apple is very good, but not quite the 
best
www.righto.com
When you buy a USB charger, how do you know if you're getting a safe, 
high-quality charger for your money? You can't tell from the outside...




is about the little Line to 5V USB adapters one sees everywhere now days,
it does show how crappy the output looks when one gets a 'bargin'

-pete
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www.febo.com
time-nuts is a low volume, high SNR list for the discussion of precise time and 
frequency measurement and related topics. To see the collection of prior 
postings to ...



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[time-nuts] For those that insist on using switching power supplies

[Pete Lancashire]

Although this link

http://www.righto.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.html

is about the little Line to 5V USB adapters one sees everywhere now days,
it does show how crappy the output looks when one gets a 'bargin'

-pete
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Re: [time-nuts] Anyone looking for HP 5060A parts/modules?

[Don Lewis]

Skip...

Would there be enough parts to make one whole unit???

Even if it had problems, ..it could be the basis of a future working unit 
for me.  ??


I'll pay shipping for all the parts, if that is a reasonable request/ offer.

Thank you

-Don

Don Lewis
N5CID




-Original Message- 
From: Skip Withrow

Sent: Tuesday, October 11, 2016 2:51 PM
To: time-nuts
Subject: [time-nuts] Anyone looking for HP 5060A parts/modules?

Hello time-nuts,

I have acquired three boxes of modules and parts to Hewlett-Packard 5060A
cesium standards.  As I don't have one of these units they are excess to my
needs.  Don't know if anyone still has one of these units ticking as they
are quite old and cesium tubes have probably long expired.  However, if you
do have a need let me know and I will see if I can help.

Please contact me off lest.

Regards,
Skip Withrow
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Re: [time-nuts] TNS-BUF High Isolation, Low Noise Buffer Amp Available

[John Ackermann N8UR]

Hi Chris --

The input and output are straight SMAs mounted on the back of the PCB. 
The idea is that you can mount it in the cover of a small die-cast box 
secured by the SMA hardware (I used a Hammond BB1590N1).  All you have 
to do is drill a couple of 3/16 holes, plus another hole for a power 
feedthrough.


This is a buffer amp, not a distribution amp, so it's a single channel 
circuit, and high isolation was one of the key design criteria.


John


On 10/12/2016 09:08 AM, Chris Caudle wrote:

On Wed, October 5, 2016 9:15 am, John Ackermann N8UR wrote:

I've previously mentioned a high performance buffer amplifier called the
"TNS-BUF" that I built based on a design by Dr. Bruce Griffiths with
further input from John Miles.


None of the pictures have shown the connector side of the assembled PCB.
Does the layout accommodate mounting in an enclosure?

And is this layout just a single channel of the buffer design?  In other
words only for buffering an oscillator to a single other device for
preventing crosstalk or injection locking, not for distribution.


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Re: [time-nuts] TNS-BUF High Isolation, Low Noise Buffer Amp Available

[Chris Caudle]

On Wed, October 5, 2016 9:15 am, John Ackermann N8UR wrote:
> I've previously mentioned a high performance buffer amplifier called the
> "TNS-BUF" that I built based on a design by Dr. Bruce Griffiths with
> further input from John Miles.

None of the pictures have shown the connector side of the assembled PCB. 
Does the layout accommodate mounting in an enclosure?

And is this layout just a single channel of the buffer design?  In other
words only for buffering an oscillator to a single other device for
preventing crosstalk or injection locking, not for distribution.

-- 
Chris Caudle


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[time-nuts] Fwd: TNS-BUF High Isolation, Low Noise Buffer Amp Available

[John Ackermann N8UR]

Just a reminder that the deadline to order TNS-BUF isolation amps is 
next week -- October 20.


John

 Forwarded Message 
Subject: [time-nuts] TNS-BUF High Isolation, Low Noise Buffer Amp Available
Date: Wed, 5 Oct 2016 10:15:46 -0400
From: John Ackermann N8UR 
Reply-To: Discussion of precise time and frequency measurement 

To: Discussion of precise time and frequency measurement 



I've previously mentioned a high performance buffer amplifier called the
"TNS-BUF" that I built based on a design by Dr. Bruce Griffiths with
further input from John Miles. Key numbers are:

*  Phase noise -140dBc/Hz at 1 Hertz offset, noise floor -175dBc/Hz.
(PN plot attached)
*  Reverse isolation greater than 100dB; low enough that I can't make a
trustworthy measurement.
*  Gain from -10 to +7 dB from 1 to 30 MHz; maximum output >18dBm.
*  Nominal 18VDC operation, but works down to 12V with lowered
maximum output level.

There's information, including performance data and schematic, at
http://www.febo.com/pages/TNS-BUF

There seems to be some interest in an amplifier like this, so TAPR has
decided to do a limited production run.  The amp is built with surface
mount parts, so we thought an assembled and tested board was better than
a kit.  The price will be $119 each.  But we have no idea how much
interest there is, and we need to build a minimum of 25 units to make
production feasible.

So, here's the deal:  you can order your TNS-BUF at

http://tapr.org/kits_tns-buf

through *October 20*.  If we receive orders for at least 25 boards by
then, we will charge credit cards and place the production order with
our contract manufacturer.  If we don't get 25 orders, we'll cancel the
project and credit cards will not be charged.  There's no guarantee that
boards will be available for later order.

We expect about 60 days between placing the manufacturing order and
receipt of the boards at TAPR.  We'll ship to customers ASAP after
receipt.  So that means you can expect to receive your order shortly
after January 1.

So, go to http://tapr.org/kits_tns-buf now to place your order before
the deadline!

John




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