[time-nuts] Partridge Divider Board

Mon Feb 28 20:21:02 UTC 2011

They're not soldered on yet, guess I'll have a look at them. Trouble is,
sources you think might be OK at higher prices turn out to sell the same
thing you buy straight from the old country at vast markups. Maybe it's
like we used to say about dope in the longago misty past... know your
dealer   :-)
Don

Adrian
> That happened to me with some cheapo SMA / BNC adapters. Also, the
> plastic was not PTFE, just some cheap molded plastic (partially pressed
> inside the female contact), and the contact material is usually cheap
> brass rather than beryllium copper, which means, the contact is not
> reliable an wears out quickly... not to talk of the 'single atom layer'
> gold plating that serves decorative purposes only...
> Good if you've found a reliable source of cheap connectors, otherwise
> they might just be good for display.
>
> Adrian
>
>
> Bob Camp schrieb:
>> 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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>>>
>>>
>>
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>
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-- 
"Neither the voice of authority nor the weight of reason and argument are
as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell

Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
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