[time-nuts] FW: Re: Low-Cost 6+ GHz Prescaler board for

Thu Mar 25 23:52:39 UTC 2010

A few notes about the connector.

First, I hate BNC connectors.

But the BNC is useable to 11 GHz (No vswr spec.), and has a VSWR spec. of 1.3:1
up to 4 GHz.  (See link below, about half way down the page.)
http://www.amphenolrf.com/products/bnc.asp?N=0&sid=4BAAA780568BE17F&

The application is not a precision one except for frequency - Power transfer
inaccuracy due to return loss is not a big deal here, we are not using it in a
VNA or power meter etc.  

PS: Would anybody be interested in testing an SMA to BNC-F and BNC-M to SMA pair
on a VNA?

Further, some BNC adapters (to SMA) are specified. to 8 GHz. With 1.25:1 VSWR
Also - here is a BNC to SMA bulkhead with 10 GHz VSWR max of 1.4:1
http://www.fairviewmicrowave.com/adaptersbncsma.htm (Bottom middle).

Now if only we could find a SMA to SMA bulkhead that fit in a BNC mounting
hole...

John Allen K1AE

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf
Of Samuel DEMEULEMEESTER
Sent: Thursday, March 25, 2010 7:01 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] FW: Re: Low-Cost 6+ GHz Prescaler board for

Too expensive. A solution might be to use a TNC adapter with a
TNC(M)-to-SMA(F) adapter (see http://cpc.cx/OF). Cost only a few bucks.

-----Message d'origine-----
De : time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] De la
part de David C. Partridge
Envoyé : jeudi 25 mars 2010 23:45
À : 'Discussion of precise time and frequency measurement'
Objet : Re: [time-nuts] FW: Re: Low-Cost 6+ GHz Prescaler board for

3.5mm 

Dave
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Samuel DEMEULEMEESTER
Sent: 25 March 2010 21:02
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] FW: Re: Low-Cost 6+ GHz Prescaler board for

BNC is definitely not an option. My "standard" connector for this project is
a TNC connector. It's rated to 8 GHz and
many adapter are available for cheap. The N connector might be an option (I
can propose the PCB with a
Type-N) but as you said, it will require another front panel. Keep in mind
that Agilent is selling this front panel for
$199 ! I think this doesn't worth that price.

-----Message d'origine-----
De : time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] De la
part de Rich Stolte Envoyé : jeudi 25 mars
2010 21:12 À : time-nuts at febo.com Objet : [time-nuts] FW: Re: Low-Cost 6+
GHz Prescaler board for

N connector would be preferable if space would accomidate the cutout being
drilled to a larger size.  If not, the front
panel from the 5 GHZ /12 GHz counter is available from Agilent.  They did
not use a BNC connector past 3
GHz and I don't think you want to either.   As far as the specification
tradeoffs, I think you should try to mirror Agilent's specs as closely as
possible for their 5 GHz opton
<http://www.home.agilent.com/agilent/product.jspx?cc=US&lc=eng&nid=-53690243
8.536907575&pageMode=OV>
http://www.home.agilent.com/agilent/product.jspx?cc=US&lc=eng&nid=-536902438
.536907575&pageMode=OV  Anything that does not meet Agilent's spec will
cause calibration problems for anyone who wants
to send it off to a commercial calibration lab unless they are given very
specific instructions which might be hard to
do years in the future when the specs to your board have been forgotten and
mislaid.

Pricing would depend on a few factors, not the least of which would be your
fixed cost, and how much work / cost are
involved in making the front panel connector work.  I would say a range from
$250 each to $1000 each wouldn't be
unreasonable.  If you hit the low end of that range, I would be interested
in talking about buying a quantity of them
from you to resell.
At the high end of that range, you can probably find a few buyers if you
work hard at marketing, but definitely count me out.   

Right now, it is also hard to find option 010 oven timebase for these
counters.  I wonder if you or someone else on this
list has any insight about the possibility of retrofitting one of the older
ubiquitous oven oscillators, or possibly
even an lpro?  

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

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

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