@febo.com
Date: 03/27/2012 07:28 PM
Subject:Re: [time-nuts] Distribution amp - Use a video amp unit ?
Sent by:time-nuts-boun...@febo.com
Bruce wrote:
The above reverse isolation [~35 dB] is about 25dB lower than I would
expect.
D'oh! Bruce is right -- I calculated
Bruce wrote:
The above reverse isolation [~35 dB] is about 25dB lower than I would expect.
D'oh! Bruce is right -- I calculated the reverse isolation
incorrectly. I had only been expecting 40 dB, so I didn't question
the result. The breadboard actually measured nearly 63 dB.
Stable
time-nuts@febo.com
Date: 03/27/2012 07:28 PM
Subject:Re: [time-nuts] Distribution amp - Use a video amp unit ?
Sent by:time-nuts-boun...@febo.com
Bruce wrote:
The above reverse isolation [~35 dB] is about 25dB lower than I would
expect.
D'oh! Bruce is right -- I
cfo wrote:
On Mon, 26 Mar 2012 08:11:16 +1300, Bruce Griffiths wrote:
Bruce Griffiths wrote:
A circuit schematic for a current feedback triple with reasonably low
noise and distortion is attached.
Bruce
Thanx Bruce
I'm an analog noob , so i have some questions.
If i
On 3/25/2012 9:54 PM, gary wrote:
MMBD914 !=1n914.
1n914BWTm i.e. using a suffix, is something I haven't seen before, but
technically
1N914BWT != 1n914. That is, in the strict sense, the 1n914 has to be a
diode in that glass package.
As long as we're being pedantic, you're wrong. What you say
Well, *I* care...
(Damn, can't even keep a straight face hidden behind email)
Ok, well at least it's an amusing argument. Well, partially.
So, here's something I've wondered for a while: how are glass cased
diodes made? Wouldn't the temperatures needed to form the glass and
parts - I
guess speed is important.
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Peter Gottlieb
Sent: 26 March 2012 13:50
To: time-nuts@febo.com
Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
how are glass
I was only kidding a bit, since for a lot of the most common JEDEC and
also non-JEDEC conventional (as opposed to SMD) discrete components they
are similar parts with a similar numbering in SMD, and the 1N914 is one
of them - so I found it not the best example :) . However, the same
argument
though
glass (double dummet) diodes will stand 300C easily
Alan
G3NYK
--- On Mon, 26/3/12, David C. Partridge david.partri...@perdrix.co.uk wrote:
From: David C. Partridge david.partri...@perdrix.co.uk
Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
To: 'Discussion
Yes, but
The glass used to make the body of the diode melts at something like 1500C!
-Chuck Harris
ALAN MELIA wrote:
Si juctions are formed at temps of 1000C or more. Thermal failure is more likely
to be due to alloying of metal contact areas. I used to lifetest transistors up
to
360C
On 3/26/2012 10:10 AM, Chuck Harris wrote:
The glass used to make the body of the diode melts at something like 1500C!
I think they're sintered, not melted, and it's more like 700 C -
http://www.us.schott.com/epackaging/english/glass/technical_powder/passivation.html#
Bruce wrote:
A circuit schematic for a current feedback triple with reasonably
low noise and distortion is attached.
Quite a good performer for such a simple circuit. I found, both in
modeling and on the bench, that there is the usual noise bump at
200-300 MHz and non-monotonic behavior
Sintered means that the envelope is formed while the glass is in
a powdered form, and is then melted to fuse it into glass. The
key is they are using a very low temperature glass. For the
Dumet seals on the wires (the pink band) to work, the copper in the
seal has to be thoroughly wetted by the
: p...@petelancashire.com
To: time-nuts@febo.com
Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
Sounds like Paul and I have similar DA's or will soon when a Leitch gets
to the
front porch next week. Its bandwidth is spec'd at 30 MHz.
The only question I have on using DA's
On 3/26/2012 8:15 AM, Charles P. Steinmetz wrote:
Bruce wrote:
A circuit schematic for a current feedback triple with reasonably low
noise and distortion is attached.
Quite a good performer for such a simple circuit. I found, both in
modeling and on the bench, that there is the usual noise
/3/12, Chuck Harris cfhar...@erols.com wrote:
From: Chuck Harris cfhar...@erols.com
Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Date: Monday, 26 March, 2012, 15:10
Yes, but
The glass
Pure quartz glass, which is silicon dioxide, softens (bends) at 1665C, and
melts at something around 2000C.
Softening and melting are not the same thing. At the softening point glass can
be bent without breaking, at the melting point (which is quite wide) it flows
like a liquid. It has to get
Randy wrote:
if one is distributing 10 Mhz, does it really
matter what the circuit does at 300 and 900 Mhz??
That depends on what it is feeding and what noise
and other signals are getting to the DA
input. Some synthesized 10 MHz sources produce energy well above 10 MHz.
I consider
2012 14:27:39
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
Si juctions are formed at temps of 1000C or more
Charles P. Steinmetz wrote:
Bruce wrote:
A circuit schematic for a current feedback triple with reasonably low
noise and distortion is attached.
Quite a good performer for such a simple circuit. I found, both in
modeling and on the bench, that there is the usual noise bump at
200-300 MHz
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen maybe Oscilloscopes etc.
It's for better than ocxo/hobby use , and not Tnut (ps
I think people have used video amps. I got one recently for nearly
zero cost and it works as spec'd but video signals are typically 1
volt peak to peak and the amp is spec'd for 10MHz, 1dB which means
I'm right at the limit and I'm a 1 dB down, just as the spec says.
Is 1V P-P enough for your
Chris, that's got to be a really old video distribution amplifier. I was
just given a thin rack-mount video distribution amplifier with ten
outputs and the specification says 300 MHz bandwidth at 3 dB. I have not
measured its output level. It is made by Kramer and has BNC and S-video
in/out
cfo wrote:
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen maybe Oscilloscopes etc.
It's for better than ocxo/hobby use , and not Tnut
Well the easy answer.
The older 1984 video amps would roll off above 6 MC or so.
However as the IC technology took over they easily could do 30 Mhz.
I have used Grass valley 8500 series for at least 10-15 years and the work
very well.
I also have sets of Leitch DAs that are fine.
Picked up the
Sounds like Paul and I have similar DA's or will soon when a Leitch gets to the
front porch next week. Its bandwidth is spec'd at 30 MHz.
The only question I have on using DA's is the effect of them being designed to
work in a 75 ohm environment.
One thing to watch out for is what cards they
-0700
From: p...@petelancashire.com
To: time-nuts@febo.com
Subject: Re: [time-nuts] Distribution amp - Use a video amp unit ?
Sounds like Paul and I have similar DA's or will soon when a Leitch gets to
the
front porch next week. Its bandwidth is spec'd at 30 MHz.
The only question I have
On Sun, Mar 25, 2012 at 12:28 PM, Pete Lancashire
p...@petelancashire.com wrote:
The only question I have on using DA's is the effect of them being designed to
work in a 75 ohm environment.
Swap out a few resistors and you can fix the above problem.unless
they used those 75 ohm BNCs but
: Re: [time-nuts] Distribution amp - Use a video amp unit ?
Sounds like Paul and I have similar DA's or will soon when a Leitch gets to the
front porch next week. Its bandwidth is spec'd at 30 MHz.
The only question I have on using DA's is the effect of them being designed to
work in a 75 ohm
Bruce wrote:
A circuit schematic for a current feedback triple with reasonably
low noise and distortion is attached.
One caution regarding the 100 uH inductor (L3) -- many inductors of
this value exhibit self-resonance below 10 MHz, so some care may be
necessary in selection.
Best
I'm 99% sure that is all it is .. one thing nice about using something
designed 20 yrs
ago is it wont be a hybrid with the termination on the ceramic. :-)
On Sun, Mar 25, 2012 at 12:51 PM, Chris Albertson
albertson.ch...@gmail.com wrote:
On Sun, Mar 25, 2012 at 12:28 PM, Pete Lancashire
I need a distribution amp for my Tbolt , with 6..8+ outputs
The TAPR-1 is NA , and the successor status is ???.
I need it for distributing 10Mhz ref-clock to Counters
(HP,Racal,Phillips), a Rigol Sig-gen maybe Oscilloscopes etc.
It's for better than ocxo/hobby use , and not Tnut (ps
On Mon, 26 Mar 2012 08:11:16 +1300, Bruce Griffiths wrote:
Bruce Griffiths wrote:
A circuit schematic for a current feedback triple with reasonably low
noise and distortion is attached.
Bruce
Thanx Bruce
I'm an analog noob , so i have some questions.
If i multiply that schematic by 8 ,
Thats the RGB amps I have used the Extrons. Its in the basement and worked
very well.
Could not remember the name.
On Sun, Mar 25, 2012 at 4:02 PM, cfo xne...@luna.dyndns.dk wrote:
On Mon, 26 Mar 2012 08:11:16 +1300, Bruce Griffiths wrote:
Bruce Griffiths wrote:
A circuit schematic for a
I'm not so sure about the circuit. The base drive on Q3 is more of less
AC given that the resistor can only pull current out of the base. That
is, I don't see a DC bias on Q3.
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Gotcha. LEDs are hetero junction, yielding more than a diode drop.
On 3/25/2012 5:05 PM, David wrote:
On Sun, 25 Mar 2012 16:39:57 -0700, garyli...@lazygranch.com wrote:
I'm not so sure about the circuit. The base drive on Q3 is more of less
AC given that the resistor can only pull current
I forgot to mention that those old jedec part numbers specify a package
and electrical limit under one part number. That is, you can't find say
a 1n914 in SMD, but you can find direct equivalents with other numbers.
You will find supply houses listing SMD versions of jedec parts, but
El 26/03/2012 02:35, gary escribió:
I forgot to mention that those old jedec part numbers specify a
package and electrical limit under one part number. That is, you can't
find say a 1n914 in SMD, but you can find direct equivalents with
other numbers. You will find supply houses listing SMD
MMBD914 !=1n914.
1n914BWTm i.e. using a suffix, is something I haven't seen before, but
technically
1N914BWT != 1n914. That is, in the strict sense, the 1n914 has to be a
diode in that glass package.
On 3/25/2012 5:48 PM, Javier Herrero wrote:
El 26/03/2012 02:35, gary escribió:
I forgot
Charles P. Steinmetz wrote:
Bruce wrote:
A circuit schematic for a current feedback triple with reasonably low
noise and distortion is attached.
One caution regarding the 100 uH inductor (L3) -- many inductors of
this value exhibit self-resonance below 10 MHz, so some care may be
necessary
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