Re: [time-nuts] Distribution Amps

2015-04-13 Thread Frank Schneider
o.com] On Behalf Of Perry Sandeen via time-nuts Sent: 13 April 2015 00:05 To: time-nuts@febo.com Subject: [time-nuts] Distribution Amps List,   There has been a large exchangeof ideas for various home-brew or other video box alternatives which all wouldseem to work OK.   For me it was simpl

Re: [time-nuts] Distribution Amps

2015-04-12 Thread Richard (Rick) Karlquist
On 4/12/2015 3:04 PM, Perry Sandeen via time-nuts wrote: List, For me it was simpler to buy asurplus HP 5087A for best offer which turned out to be $300 delivered. The 5087 series is ancient technology that has mediocre performance. I remember looking at the circuit designs in the series

[time-nuts] Distribution Amps

2015-04-12 Thread Perry Sandeen via time-nuts
List,   There has been a large exchangeof ideas for various home-brew or other video box alternatives which all wouldseem to work OK.   For me it was simpler to buy asurplus HP 5087A for best offer which turned out to be $300 delivered.   Besides having 12 outputs, youhave a choice of 3 inp

Re: [time-nuts] Distribution amps and isolation transformers

2014-11-24 Thread Bob Camp
Hi If you decide to optimize the transformers, it’s pretty easy to do: Bought in bulk (like by the pound) ferrite binocular cores (two hole ferrite beads) are quite cheap. The last batches I got were sub 10 cents each. You can get them in a variety of sizes and compositions. Obviously bigger is

[time-nuts] Distribution amps and isolation transformers

2014-11-24 Thread Joseph Gray
Although my current project doesn't have the strict requirements that many of you have, I thought I would mention part of it, due to the recent talk of distribution amps. I am putting one of the FE5680A's that I bought a while back into a permanent home. I have a nice box from a gutted HP microwav

Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?

2013-05-19 Thread Chris Wilson
> On 19/05/13 19:12, Dave M wrote: >> Yes... .Jump on it! >> Seems to be a good price for it. If I needed a DA, I'd buy it in an >> instant. > I just grabbed a pair! (After missing out on the Soekris boxes!) > They should go well with the A2100 Timing Receivers that are currently > sat in cus

Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?

2013-05-19 Thread Iain Young
On 19/05/13 19:12, Dave M wrote: Yes... .Jump on it! Seems to be a good price for it. If I needed a DA, I'd buy it in an instant. I just grabbed a pair! (After missing out on the Soekris boxes!) They should go well with the A2100 Timing Receivers that are currently sat in customs, and the Z3

Re: [time-nuts] Distribution amps for Thunderbolt

2013-05-19 Thread Didier Juges
These are handy little boxes for the money. Unfortunately the outputs are not isolated from each other (galvanically and signal-wise) so be mindful that if you connect/disconnect one port, the adjacent port will be affected. Unless you need to, it is probably best to wire all 3 inputs in parallel (

Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?

2013-05-19 Thread Dave M
From: Chris Wilson To: time-nuts@febo.com Subject: Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box? Hi again, Chris; The HV at the end of the model number indicates that the unit is capable of handling high voltage (up to 5V - TTL level) on the sync channel

Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?

2013-05-19 Thread Chris Wilson
> Hi again, Chris; > The HV at the end of the model number indicates that the unit is capable of > handling high voltage (up to 5V - TTL level) on the sync channel. The > 0.7/1.0 Volt switch is to provide a bit of extra gain for long cable runs. > Aside from the HV difference, the unit appears t

Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?

2013-05-19 Thread Dave M
From: Chris Wilson Subject: Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box? 09/05/2013 11:58 If I get a Extron ADA 3-80 distribution amp, will it be able to run on both the 10MHz T/Bolt output, AND on the outputs of one of David Partridge's nice di

Re: [time-nuts] Distribution amps for Thunderbolt

2013-05-19 Thread Charles P. Steinmetz
Chris wrote: I have been offered one of these: ADA 6 300MX HV HDTV RGBHV 1 x 6 Analog Video Distribution Amplifier I *THINK* it should meet my needs except the HV bit worries me. It seems this means it has not got unity gain, but a gain of 0.7 or 1 volt, switch selectable. Could anyone comment

Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?

2013-05-18 Thread Chris Wilson
>> Subject: Distribution amps for Thub=nderbolt and David >> partridges divider box? >> >> 09/05/2013 11:58 >> >> If I get a Extron ADA 3-80 distribution amp, will it be able to run on >> both the 10MHz T/Bolt output, AND on the outputs of one of David >> Partridge's nice divider boxes I have. I

Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?

2013-05-09 Thread Chris Wilson
> Chris, if I understand your question correctly, the answer is "Yes". The > ADA-3-80 has four separate channels (R, G, B, Sync), and multiple outputs > for each channel. So, you can input up to four separate frequencies and get > up to four outputs for each channel. Quite a versatile little

Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?

2013-05-09 Thread Dave M
Subject: Distribution amps for Thub=nderbolt and David partridges divider box? 09/05/2013 11:58 If I get a Extron ADA 3-80 distribution amp, will it be able to run on both the 10MHz T/Bolt output, AND on the outputs of one of David Partridge's nice divider boxes I have. It It divides from the 1

[time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?

2013-05-09 Thread Chris Wilson
09/05/2013 11:58 If I get a Extron ADA 3-80 distribution amp, will it be able to run on both the 10MHz T/Bolt output, AND on the outputs of one of David Partridge's nice divider boxes I have. It It divides from the 10 MHz input. There are separate outputs for 10 MHz, 5 MHz, 1 MHz, and one that

Re: [time-nuts] Distribution amps and slew rate

2012-11-04 Thread Bob Camp
Hi If you slew rate limit the square wave (which is reality) you get a sin(x)/x frequency response. It doesn't go to infinity, but the lobes keep going for quite a while. Things like cables and connectors have upper frequency limits as well. A square wave will only be happy with a linear phas

Re: [time-nuts] Distribution amps and slew rate

2012-11-03 Thread Magnus Danielson
On 11/04/2012 01:13 AM, Peter Gottlieb wrote: Of course you can't have a perfect square wave! That would imply zero transition time ... oh, THAT would be useful! :D No trigger point jitter! ... and it would be a hell to contain within the cables and connectors we have, as they leak a lot as y

Re: [time-nuts] Distribution amps and slew rate

2012-11-03 Thread Peter Gottlieb
Of course you can't have a perfect square wave! That would imply zero transition time and since frequency is inverse to time that implies infinitely high frequency bandwidth is required to achieve that perfect square wave. Getting a "square" wave with a "fast enough" slew rate between high and

Re: [time-nuts] Distribution amps and slew rate

2012-11-03 Thread Chris Albertson
The below is correct but a simpler way to say it is this: "A square wave contains the fundamental frequency plus every odd harmonic up to infinity. A sine wave contains only the fundamental frequency." It is the "up to infinity" part that causes all the trouble. And yes it really does go to inf

Re: [time-nuts] Distribution amps and slew rate

2012-11-03 Thread Charles P. Steinmetz
david wrote: Given that slew rate is so critical, why do we distribute sine waves and perform the zero-crossing detection at every target instrument? Magnus made some good points in response to your question. To elaborate a bit: it is much easier to provide a friendly transmission environmen

Re: [time-nuts] Distribution amps and slew rate

2012-11-03 Thread Bob Camp
Hi If you have a sine wave, it gets into everything. You can identify it and take it out of your data. If you have a broad band uber-fast high level pules, it gets into everything. Identifying it's impact and taking it out of the data - not so easy. That may sound a bit crazy. I've actually wo

Re: [time-nuts] Distribution amps and slew rate

2012-11-03 Thread Magnus Danielson
David, On 11/03/2012 10:44 PM, David Hooke wrote: Folks, Given that slew rate is so critical, why do we distribute sine waves and perform the zero-crossing detection at every target instrument? ... or rather, why do we design our input stages so they are so slew-rate sensitive? Sine isn't

[time-nuts] Distribution amps and slew rate

2012-11-03 Thread David Hooke
Folks, Given that slew rate is so critical, why do we distribute sine waves and perform the zero-crossing detection at every target instrument? david Trigger jitter is the noise at the trigger point. it's a combination of thermal noise and the slew-rate at the trigger points. It is often