[time-nuts] Partridge Divider Board

[Bob Camp]

Hi

Some of the connectors you get from odd places have threads that aren't
quite right. They are the right "polarity" they just aren't cut deep enough.
I would not order a ton of parts until I saw a sample. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Don Latham
Sent: Monday, February 28, 2011 1:15 PM
To: GPBATEY at compuserve.com; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] Partridge Divider Board

I found right angle sma's with long threaded shanks that will mount to a 
panel for about $1.00 apiece on epray. These are made in the Old Country and

are shipped from Hong Kong. I don't know if there are BNC's that will 
directly solder to the board.
Don

----- Original Message ----- 
From: "Gordon Batey" <gpbatey at wildblue.net>
To: <time-nuts at febo.com>
Sent: Monday, February 28, 2011 7:01 AM
Subject: Re: [time-nuts] Partridge Divider Board


> Greetings to the TimeKeepers,
>
> I appreciate the comments on the Partridge Divider board.  I am also 
> seeking
> an enclosure and your comments have some interest for me.
>
> I would also be interested in any comments regarding a source of input and
> output connectors for this project.  The board is designed for SMA 
> vertical
> connectors which I have found at about $10 each.  Pretty steep for me.  I
> would prefer right angle, threaded BNC connectors similar to those used in
> the TAPR distribution box but I have not found any of these that appear to
> be suitable.  Any suggestions are appreciated.
>
> 73 Gordon WA4FJC
> GPBATEY at wildblue.net
>
> ====================================================================
>
>
> Date: Sun, 27 Feb 2011 20:35:33 EST
> From: Brucekareen at aol.com
> Subject: [time-nuts] Partridge Divider Board and 10 MHz Distribution
> Amplifier Enclosure -- an Idea
> To: time-nuts at febo.com
> Message-ID: <173ea2.5175575.3a9c55e5 at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> While admiring my newly received divider board from David Partridge and
> thinking about a suitable enclosure for its use on my bench, I happened to
> look  at an Extron ADA3 80 video distribution amplifier that I acquired
> after
> suggestions from KO4BB.  These enclosures are mechanically sturdy and 
> quite
>
> empty on the inside.  There is plenty of room to mount the divider board
> if existing (unused) threaded standoffs are relocated to match the 
> divider
> board mounting holes.  As the distribution amplifier's circuit  board and
> connections are all on the back panel, the front panel is completely  free
> and
> clear for mounting the division ratio switch and output  connectors.
>
> The analog performance of the distribution amplifier seems very good;
> however, the BNC output connectors are grounded to the case and there is
> only
> one active output device for each of the R, G, & B outputs.  The  three
> output connectors provided for each are simply isolated through resistors,
> thus
> isolation is limited.  Nevertheless, for a single bench setup  like mine,
> the distribution amplifier will probably serve adequately well to
> distribute
> 10 MHz from a T-bolt to the counters, divider board, and a  signal 
> generator
>
> -- all on the same bench.  As the R, G, & B DA  inputs can be looped, the
> ADA3 80 can provide up to nine 10 MHz outputs   via BNC connectors.
>
> The ADA3 80 is powered from an external 9-volt, 500 ma wall wart.
> According to KO4BB:  _http://www.ko4bb.com/Timing/Distribution_Amp/_
> (http://www.ko4bb.com/Timing/Distribution_Amp/) ,  the DA has an onboard
> switching
> converter and + and -5 volt regulators to power  the distribution
> amplifiers.  It
> is possible there is sufficient +5 volt  current capacity to power the
> divider board too.  I have not investigated  this yet as I am not certain
> about
> the maximum current requirement for the  divider board.  Assuming it can 
> be
> powered from the existing supply, one  could wind up with a very nice and
> compact bench frequency reference and  distribution system.
>
> Extron rates the power consumption of the ADA3 80 at 2-watts.   However, 
> it
> appears Extron uses the same PC board and power unit for the ADA3  180 for
> which the power consumption is 3-watts.
> Thus there may be adequate capacity to safely power the divider  board.
>
> If power supply noise is a problem, there is plenty of room in the case 
> for
> additional filtering.
>
> Bruce Hunter, KG6OJI
>
>
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