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 have in them. -pete On Sun, Mar 25, 2012 at 11:39 AM, paul swed <paulsw...@gmail.com> wrote: > 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 whole tray for some silly amount of $ 20 I think. > I prefer the simple 8601 DAs but have 8604 delay days and they can all be > made into simple DAs with a few jumpers that are on the boards. > I have also used a rgb da 6 output for each channel. No issue at all. > One comment you would want to insure the amps are ac coupled and clamping > turned off since there is no sync signal to establish the clamp level. > Regards > Paul > WB8TSL > > On Sun, Mar 25, 2012 at 2:14 PM, Bruce Griffiths <bruce.griffi...@xtra.co.nz >> wrote: > >> 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 (ps accuracy). >>> >>> I have seen suggestions for using a video distributiution unit. >>> But in my part of the world (EU) , there isn't a lot on "eby". >>> I have seen some RGB amps , and was wondering if i could use those ? >>> >>> Could i use a 1:6 RGB unit for : Tbolt on R , FEI-5680A on G - and ?? on >>> B ? >>> >>> I'm not experienced (yet) in the analog domain. >>> >>> If i go (simple diy) Would this one work (also wo. the trafo's) ? >>> http://www.oz9fw.dk/PDF%**20files/rubidium.pdf<http://www.oz9fw.dk/PDF%20files/rubidium.pdf> >>> >>> I do have some trafo's on an old 10Mhz 8-chan Hub , that i might be able >>> to salvage if needed. >>> >>> Thanx for any input/hints >>> >>> CFo - T-Nut beginner Denmark. >>> >>> >>> >>> ______________________________**_________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/** >>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >>> and follow the instructions there. >>> >>> >>> >> Winding your own transformers isnt particularly difficult if you have >> suitable (binocular) cores. >> The discrete amplifier shown has a class AB output stage, lower distortion >> is possible if a class A output stage is used (requires an extra resistor >> between the output stage emitters and an additional diode in series with >> the LED). >> With a Class A output stage the 39 ohm resistors should be replaced by a a >> pair of 100 ohm resistors to match the load. >> Significantly lower distortion is possible if feedback from the output to >> the input stage is used. >> If the feedback gain is unity (or less) at dc higher AC gains won't >> significantly degrade the close in phase noise. >> A different amplifier topology using the same number of transistors will >> allow a higher reverse isolation to be achieved. >> >> One problem with video distribution units (aside from the relatively high >> phase noise floor) is the limited output drive available. For some purposes >> 16-20dBm outputs are desirable. >> >> Bruce >> >> >> ______________________________**_________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/** >> mailman/listinfo/time-nuts<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. _______________________________________________ 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.