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: [email protected] [mailto:[email protected]] On
Behalf Of Don Latham
Sent: Monday, February 28, 2011 1:15 PM
To: [email protected]; 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"<[email protected]>
To:<[email protected]>
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
[email protected]
====================================================================
Date: Sun, 27 Feb 2011 20:35:33 EST
From: [email protected]
Subject: [time-nuts] Partridge Divider Board and 10 MHz Distribution
Amplifier Enclosure -- an Idea
To: [email protected]
Message-ID:<[email protected]>
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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