Re: [time-nuts] Thunderbolt distribution amplifier needed.
Hello, You can try the solution listed here : http://naelcom.fr/app/download/5788490907/Data+sheet+NGA-DIS+Preliminary+V1. 1.pdf Luc ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt distribution amplifier needed
Remember * * * these DAs are designed be unity gain and to handle approximately 1 volt p-p so be carefull of clipping if you drive much more than that level or alternatively, pad down the input to a 1 volt level. Also, video DAs are designed to drive 75 ohms (the video world's standard distribution impedance), so you will get additional attenuation at the output if you are driving 50 ohms, and you may get current clipping. That said, some video DAs work quite well at 10 MHz/50 ohms/+13 dBm (= 1 V rms = 2.8 V p-p) if you modify the internal input and output impedances. In some cases, you can reduce the added phase noise by reducing the LF gain. Best regards, Charles ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Thunderbolt distribution amplifier needed
I currently use a Grass Valley Group 8802 video distribution amp (DA). Yes they start to roll-off the frequency at 6 MHz but the roll-off is gradual and it will certianly pass 10 MHz with no problem. Remember you are not passing multple frequencies or multi-burst, just 10 MHz. Also, these DAs are designed be unity gain and to handle approximately 1 volt p-p so be carefull of clipping if you drive much more than that level or alternatively, pad down the input to a 1 volt level. From: "time-nuts-requ...@febo.com" To: time-nuts@febo.com Sent: Tuesday, August 21, 2012 1:00 PM Subject: time-nuts Digest, Vol 97, Issue 63 Send time-nuts mailing list submissions to time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to time-nuts-requ...@febo.com You can reach the person managing the list at time-nuts-ow...@febo.com When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics: 1. Re: Thunderbolt distribution amplifier needed (Chris Albertson) 2. Re: Thunderbolt distribution amplifier needed (Pete Lancashire) 3. Re: Thunderbolt distribution amplifier needed (paul swed) 4. Re: : L1 GPS timing signal(s) into local time oncomputer(s) (Bill Hawkins) 5. Maker Faire Sept 29 & 30 NY Hall of Science (MITCHELL JANOFF) 6. Re: : L1 GPS timing signal(s) into local time on computer(s) (Hal Murray) -- Message: 1 Date: Tue, 21 Aug 2012 09:54:14 -0700 From: Chris Albertson To: "BD Systems Inc." , Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Thunderbolt distribution amplifier needed Message-ID: Content-Type: text/plain; charset=ISO-8859-1 I bought a eBay video distribution amp. The bandwidth was not as good as I liked but for some reason the opamps were run off +/- 12 volts. Raising the power to +/- 18V greatly improved the performance of the amp. Many video amp assume the signal to 6MHz bandwidth might not be ideal. But on the other hand some old studio equipment is grossly over engineered and might be very good for 10Mhz distribution. The good news is the today analog video amps are cheap as dirt as no one wants analog video. On Tue, Aug 21, 2012 at 7:17 AM, BD Systems Inc. wrote: > Use an analog video distribution amplifier (Grass Valley Group, Leitch, > Ross Video etc). These have between 6 to 8 outputs and will provide a > reference to various test equipment. > > > From: "time-nuts-requ...@febo.com" > To: time-nuts@febo.com > Sent: Tuesday, August 21, 2012 6:00 AM > Subject: time-nuts Digest, Vol 97, Issue 60 > > Send time-nuts mailing list submissions to > time-nuts@febo.com > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > or, via email, send a message with subject or body 'help' to > time-nuts-requ...@febo.com > > You can reach the person managing the list at > time-nuts-ow...@febo.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of time-nuts digest..." > > > Today's Topics: > > 1. Thunderbolt distribution amplifier needed. (Chris Wilson) > > > ------------------ > > Message: 1 > Date: Tue, 21 Aug 2012 11:44:17 +0100 > From: Chris Wilson > To: "time-nuts@febo.com" > Subject: [time-nuts] Thunderbolt distribution amplifier needed. > Message-ID: <5746920.20120821114...@chriswilson.tv> > Content-Type: text/plain; charset=windows-1252 > > > > 21/08/2012 11:40 > > Can anyone please link specifically to a suitable distribution amp for > my TB please, either here if it's allowed, or by e-mail to me at > ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay > purchase would be painless. I feel it would be really easy for someone > as daft as me to buy something totally unsuitable. I want to run David > Partridge's divider board and have enough 10MHz signalleft to run other > stuff as well, David recommended I run the amp between the TB and his > divider. Cheers. > > -- > Best Regards, > Chris Wilson. > mailto: ch...@chriswilson.tv > > > > > -- > > ___ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 97, Issue 60 > **
Re: [time-nuts] Thunderbolt distribution amplifier needed.
On Tue, 21 Aug 2012 11:44:17 +0100, Chris Wilson wrote: > Can anyone please link specifically to a suitable distribution amp for > my TB please, Cost is a factor, and I > am in the UK. An Ebay purchase would be painless. I feel it would be > really easy for someone as daft as me to buy something totally > unsuitable. I use a 350MHz 6-chan RGBHV Dist. Amp. i got cheap off eB..-UK for £30. I think i was lucky there ... It's a A Procon : 4516-01 , same as Solecis: AVB-DA-RGBHV-0106 , and also the same as this one. http://www.amx.com/products/AVB-DA-RGBHV-0106.asp There is what i would think .. a similar unit eB# 200798058748 , but at the listed price, you might want to go for one of the Extrons from US CFO Denmark ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt distribution amplifier needed
Exactly right on many of the accounts. The oldest DAs may be 6 Mhz but I am not sure you will even find them any longer. The more modern preHDTVs were all easily in the 10-30 Mhz region. Most have eq adjustments so that you could peak for the higher frequency like 10 Mhz. Boy the amps and chassis are cheap these days. Stay clear of more complicated DAs like delay if possible. Just lots of stuff to add noise and lots of little jumpers to change. Picked up 2 trays of GVG 8500 class DAs for $30 each. They are junk actually these days. So most are headed to the dumpsters. Regards Paul On Tue, Aug 21, 2012 at 12:54 PM, Chris Albertson wrote: > I bought a eBay video distribution amp. The bandwidth was not as good as > I liked but for some reason the opamps were run off +/- 12 volts. Raising > the power to +/- 18V greatly improved the performance of the amp. Many > video amp assume the signal to 6MHz bandwidth might not be ideal. But on > the other hand some old studio equipment is grossly over engineered and > might be very good for 10Mhz distribution. The good news is the today > analog video amps are cheap as dirt as no one wants analog video. > > > > > On Tue, Aug 21, 2012 at 7:17 AM, BD Systems Inc. > wrote: > > > Use an analog video distribution amplifier (Grass Valley Group, Leitch, > > Ross Video etc). These have between 6 to 8 outputs and will provide a > > reference to various test equipment. > > > > > > From: "time-nuts-requ...@febo.com" > > To: time-nuts@febo.com > > Sent: Tuesday, August 21, 2012 6:00 AM > > Subject: time-nuts Digest, Vol 97, Issue 60 > > > > Send time-nuts mailing list submissions to > > time-nuts@febo.com > > > > To subscribe or unsubscribe via the World Wide Web, visit > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > or, via email, send a message with subject or body 'help' to > > time-nuts-requ...@febo.com > > > > You can reach the person managing the list at > > time-nuts-ow...@febo.com > > > > When replying, please edit your Subject line so it is more specific > > than "Re: Contents of time-nuts digest..." > > > > > > Today's Topics: > > > > 1. Thunderbolt distribution amplifier needed. (Chris Wilson) > > > > > > -- > > > > Message: 1 > > Date: Tue, 21 Aug 2012 11:44:17 +0100 > > From: Chris Wilson > > To: "time-nuts@febo.com" > > Subject: [time-nuts] Thunderbolt distribution amplifier needed. > > Message-ID: <5746920.20120821114...@chriswilson.tv> > > Content-Type: text/plain; charset=windows-1252 > > > > > > > > 21/08/2012 11:40 > > > > Can anyone please link specifically to a suitable distribution amp for > > my TB please, either here if it's allowed, or by e-mail to me at > > ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay > > purchase would be painless. I feel it would be really easy for someone > > as daft as me to buy something totally unsuitable. I want to run David > > Partridge's divider board and have enough 10MHz signalleft to run other > > stuff as well, David recommended I run the amp between the TB and his > > divider. Cheers. > > > > -- > > Best Regards, > > Chris Wilson. > > mailto: ch...@chriswilson.tv > > > > > > > > > > -- > > > > ___ > > time-nuts mailing list > > time-nuts@febo.com > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > End of time-nuts Digest, Vol 97, Issue 60 > > * > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > > -- > > Chris Albertson > Redondo Beach, California > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt distribution amplifier needed
It all depends on the brand and if 'commercial' or not. A Grass Valley (dont remember the model) tested is 3db down starting around 25 MHz. I have also seen others that have a LP filter option installed on the input module. -pete On Tue, Aug 21, 2012 at 9:54 AM, Chris Albertson wrote: > I bought a eBay video distribution amp. The bandwidth was not as good as > I liked but for some reason the opamps were run off +/- 12 volts. Raising > the power to +/- 18V greatly improved the performance of the amp. Many > video amp assume the signal to 6MHz bandwidth might not be ideal. But on > the other hand some old studio equipment is grossly over engineered and > might be very good for 10Mhz distribution. The good news is the today > analog video amps are cheap as dirt as no one wants analog video. > > > > > On Tue, Aug 21, 2012 at 7:17 AM, BD Systems Inc. wrote: > >> Use an analog video distribution amplifier (Grass Valley Group, Leitch, >> Ross Video etc). These have between 6 to 8 outputs and will provide a >> reference to various test equipment. >> >> >> From: "time-nuts-requ...@febo.com" >> To: time-nuts@febo.com >> Sent: Tuesday, August 21, 2012 6:00 AM >> Subject: time-nuts Digest, Vol 97, Issue 60 >> >> Send time-nuts mailing list submissions to >> time-nuts@febo.com >> >> To subscribe or unsubscribe via the World Wide Web, visit >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> or, via email, send a message with subject or body 'help' to >> time-nuts-requ...@febo.com >> >> You can reach the person managing the list at >> time-nuts-ow...@febo.com >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of time-nuts digest..." >> >> >> Today's Topics: >> >> 1. Thunderbolt distribution amplifier needed. (Chris Wilson) >> >> >> -- >> >> Message: 1 >> Date: Tue, 21 Aug 2012 11:44:17 +0100 >> From: Chris Wilson >> To: "time-nuts@febo.com" >> Subject: [time-nuts] Thunderbolt distribution amplifier needed. >> Message-ID: <5746920.20120821114...@chriswilson.tv> >> Content-Type: text/plain; charset=windows-1252 >> >> >> >> 21/08/2012 11:40 >> >> Can anyone please link specifically to a suitable distribution amp for >> my TB please, either here if it's allowed, or by e-mail to me at >> ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay >> purchase would be painless. I feel it would be really easy for someone >> as daft as me to buy something totally unsuitable. I want to run David >> Partridge's divider board and have enough 10MHz signalleft to run other >> stuff as well, David recommended I run the amp between the TB and his >> divider. Cheers. >> >> -- >> Best Regards, >> Chris Wilson. >> mailto: ch...@chriswilson.tv >> >> >> >> >> -- >> >> ___ >> time-nuts mailing list >> time-nuts@febo.com >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> >> End of time-nuts Digest, Vol 97, Issue 60 >> * >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > > -- > > Chris Albertson > Redondo Beach, California > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt distribution amplifier needed
I bought a eBay video distribution amp. The bandwidth was not as good as I liked but for some reason the opamps were run off +/- 12 volts. Raising the power to +/- 18V greatly improved the performance of the amp. Many video amp assume the signal to 6MHz bandwidth might not be ideal. But on the other hand some old studio equipment is grossly over engineered and might be very good for 10Mhz distribution. The good news is the today analog video amps are cheap as dirt as no one wants analog video. On Tue, Aug 21, 2012 at 7:17 AM, BD Systems Inc. wrote: > Use an analog video distribution amplifier (Grass Valley Group, Leitch, > Ross Video etc). These have between 6 to 8 outputs and will provide a > reference to various test equipment. > > > From: "time-nuts-requ...@febo.com" > To: time-nuts@febo.com > Sent: Tuesday, August 21, 2012 6:00 AM > Subject: time-nuts Digest, Vol 97, Issue 60 > > Send time-nuts mailing list submissions to > time-nuts@febo.com > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > or, via email, send a message with subject or body 'help' to > time-nuts-requ...@febo.com > > You can reach the person managing the list at > time-nuts-ow...@febo.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of time-nuts digest..." > > > Today's Topics: > > 1. Thunderbolt distribution amplifier needed. (Chris Wilson) > > > -- > > Message: 1 > Date: Tue, 21 Aug 2012 11:44:17 +0100 > From: Chris Wilson > To: "time-nuts@febo.com" > Subject: [time-nuts] Thunderbolt distribution amplifier needed. > Message-ID: <5746920.20120821114...@chriswilson.tv> > Content-Type: text/plain; charset=windows-1252 > > > > 21/08/2012 11:40 > > Can anyone please link specifically to a suitable distribution amp for > my TB please, either here if it's allowed, or by e-mail to me at > ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay > purchase would be painless. I feel it would be really easy for someone > as daft as me to buy something totally unsuitable. I want to run David > Partridge's divider board and have enough 10MHz signalleft to run other > stuff as well, David recommended I run the amp between the TB and his > divider. Cheers. > > -- > Best Regards, > Chris Wilson. > mailto: ch...@chriswilson.tv > > > > > -- > > ___ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 97, Issue 60 > * > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Thunderbolt Distribution Amplifier Needed
Chris, I was able to mount my David Partridge divider board inside an Extron ADA 6 300MX television distribution amplifier along with a 1 MHz sine wave filter and a 10 MHz to 100 MHz multiplier. On the front panel is a selector switch for selecting the division ratio, BNC jacks for this and the other board outputs, plus 1 MHz, 10 MHz, and 100 MHz sine wave output connectors. These distribution amplifiers have a very nice case with a blank front panel and are mostly empty inside. Everything inside is powered from the internal Extron power supply, although I had to add a 12/5-V switching convertor and Murata filter to obtain the 320 ma 5-V current needed for the divider board. The internal power supply generates 12 VDC at about 25 VA. a 7508 5V regulator provides +5 VDC to the DA board. An LT1054CT switching convertor develops -12 V that is passed through a 7905 regulator to provide -5 V to the DA. The power supply has vacant 12 V connection points that can be used for powering other devices. This Extron product is intended to provide six 75-ohm outputs each of RGB and sync. I used the sync DA for 1 MHz square wave and the RGB DAs for 1, 10, and 100 MHz sine wave outputs. As I recall, the internal DAs frequency response extends to about 300 MHz. I converted the 75-ohm outputs to 50-ohms by changing the buildout resistors from 75 to 50 ohms. These distribution amplifiers are available rather inexpensively on eBay as a result of the demise of NTSC. I think I paid about US$20. Bruce, KG6OJI ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Thunderbolt distribution amplifier needed
Use an analog video distribution amplifier (Grass Valley Group, Leitch, Ross Video etc). These have between 6 to 8 outputs and will provide a reference to various test equipment. From: "time-nuts-requ...@febo.com" To: time-nuts@febo.com Sent: Tuesday, August 21, 2012 6:00 AM Subject: time-nuts Digest, Vol 97, Issue 60 Send time-nuts mailing list submissions to time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to time-nuts-requ...@febo.com You can reach the person managing the list at time-nuts-ow...@febo.com When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics: 1. Thunderbolt distribution amplifier needed. (Chris Wilson) -- Message: 1 Date: Tue, 21 Aug 2012 11:44:17 +0100 From: Chris Wilson To: "time-nuts@febo.com" Subject: [time-nuts] Thunderbolt distribution amplifier needed. Message-ID: <5746920.20120821114...@chriswilson.tv> Content-Type: text/plain; charset=windows-1252 21/08/2012 11:40 Can anyone please link specifically to a suitable distribution amp for my TB please, either here if it's allowed, or by e-mail to me at ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay purchase would be painless. I feel it would be really easy for someone as daft as me to buy something totally unsuitable. I want to run David Partridge's divider board and have enough 10MHz signalleft to run other stuff as well, David recommended I run the amp between the TB and his divider. Cheers. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv -- ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 97, Issue 60 * ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt distribution amplifier needed.
From: Chris Wilson
21/08/2012 11:40
Can anyone please link specifically to a suitable distribution amp for
my TB please, either here if it's allowed, or by e-mail to me at
ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay
purchase would be painless. I feel it would be really easy for someone
as daft as me to buy something totally unsuitable. I want to run David
Partridge's divider board and have enough 10MHz signalleft to run
other stuff as well, David recommended I run the amp between the TB
and his divider. Cheers.
Chris,
I've been using an Extron ADA 3-80 RGB video DA for distributing standard
frequencies to other instruments. It has worked very well for me. They are
frequently available on Ebay quite cheaply.
.There's a good discussion on using the Extron DA for 10MHz frequency
distribution at http://www.ko4bb.com/ham_radio/Extron_3_80/. There's a
couple on Ebay right now (Item 160867891412 and Item 370641502891 {different
model}). They're in the USA, so shipping to the UK might be a bit painful
unless you can get someone to act as a shipping agent.
Other Extron models will probably do as well... chech out the Extron
literature for details. I like the ADA 3-80 because of the number of inputs
and outputs it offers. Bandwidth is great and noise is low. If you need
really low noise distribution, you will have to determine suitability for
your needs.
Cheers,
Dave M
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
[time-nuts] Thunderbolt distribution amplifier needed.
21/08/2012 11:40 Can anyone please link specifically to a suitable distribution amp for my TB please, either here if it's allowed, or by e-mail to me at ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay purchase would be painless. I feel it would be really easy for someone as daft as me to buy something totally unsuitable. I want to run David Partridge's divider board and have enough 10MHz signalleft to run other stuff as well, David recommended I run the amp between the TB and his divider. Cheers. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
