[time-nuts] Thunderbolt distribution amplifier needed

paul swed paulswedb at gmail.com
Tue Aug 21 17:20:05 UTC 2012


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 <albertson.chris at gmail.com
> 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. <bdsysco at yahoo.com>
> 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-request at febo.com" <time-nuts-request at febo.com>
> > To: time-nuts at febo.com
> > Sent: Tuesday, August 21, 2012 6:00 AM
> > Subject: time-nuts Digest, Vol 97, Issue 60
> >
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> >   1. Thunderbolt distribution amplifier needed. (Chris Wilson)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Tue, 21 Aug 2012 11:44:17 +0100
> > From: Chris Wilson <chris at chriswilson.tv>
> > To: "time-nuts at febo.com" <time-nuts at febo.com>
> > Subject: [time-nuts] Thunderbolt distribution amplifier needed.
> > Message-ID: <5746920.20120821114417 at 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
> > chris at 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: chris at chriswilson.tv
> >
> >
> >
> >
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>
> --
>
> Chris Albertson
> Redondo Beach, California
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