[time-nuts] Partridge Divider Board
David C. Partridge
david.partridge at perdrix.co.uk
Mon Feb 28 15:28:35 UTC 2011
eBay (in this case) is your friend - lots of suitable SMA and SMB vertical or RA connectors easily found.
I recently bought 60 SMB PCB mount verticals for GBP10 I then used RA SMB connectors to go to an external panel mount BNC.
You should be able to find RA SMA PCB mount sockets (jacks) that will fit and also allow through panel mounting.
A quick ebay search with "sma pcb right angle" turned up these on very short order and there's lots more suitable for bulkhead mount.
If you want TNC (threaded version of BNC) with 5mm (0.2") pinouts - that's more of a problem as they normally are 0.4".
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Gordon Batey
Sent: 28 February 2011 14:01
To: time-nuts at febo.com
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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