My 2 cents. I just repurposed an RGB video distribution amp for use with a rubidium. The board has three EL2070 (200 MHz BW) amps, each one feeds several BNC jacks for RGB output. I only need three separate, isolated outputs, so I am feeding the rubidium into all three EL2070's and only taking one output from each chip, via an isolation transformer.
This seems to be working just fine for my intended purpose. I still need to add the DDS and a few other items to the box to complete the project. Joe Gray W5JG On Sat, Jan 3, 2015 at 8:37 PM, paul swed <[email protected]> wrote: > Dave > I am sure there will be many answers. But yes indeed it will work fine. All > of the outputs should have the same delay also and that may be useful. > > There really are the two approaches. The big power amp thats a 1/2 Watt you > are talking and the many small amps as in the distributed mode. > > Whats interesting is the telcos always do the big amp splitter and the test > equipment manufactures use precision distributed distribution amps. I guess > its a pick your poison. Or maybe the test equipment manufacturers needed > more isolation port to port. Or heavens maybe they could just sell them for > more money. Would they do that? > Humor aside each has a very good reason for doing the distribution and its > driven by the requirements. > > I have several of those spitters and picked them up for $ 0 at hamfests. > Seems no one had a use for them when all of the 900 Mhz gear came out of > the sites. Mostly gone at this point. A 1/2 watt 10 Mhz amp is not that > hard to build look at the many Ham sites we have a band close to 10 Mhz/ 30 > Meter. > Regards > Paul > WB8TSL > > On Sat, Jan 3, 2015 at 6:09 PM, Dr. David Kirkby (Kirkby Microwave Ltd) < > [email protected]> wrote: > >> I was looking to make a 10 MHz distribution amp to feed test equipment with >> the output of a GPSDO. >> >> I see this >> >> http://m.ebay.com/itm/201244302355 >> >> 16-way Minicircuits splitter on eBay which I got for $40. I guess the loss >> is around 12 dB. >> >> I actually bought another for $35 which was similar but one of them, the >> isolation data made no sense, so given their low cost I just bought both. >> >> I suspect internally these 16 way units might have a pair of 8 way dividers >> as there are two isolation figures, depending on what ports one is >> measuring between >> >> Is there any reason not to just drive that with 22 dBm or so of power to >> get 10 dBm at each of 16 ports? >> >> Is 10 dBm an optimal value? >> >> I see several distribution amp designs witb one amplifier on each output, >> but is it just a lot less hassle to split a higher power amp. >> >> I have a range of Minicircuits amps in my junk box in little enclosures, >> which means a distribution amp can be built from just 3 main components >> >> * PSU >> * Power amplifier >> * 16 way splitter. >> >> That seems a *lot* simpler than many designs I see. >> >> I was looking to feed it with an HP 58503A or similar device. >> >> I do have an amplifier in my junk box which will produce 27 dBm. If I >> combined that with 16 x 5 dB attenuators I could improve the isolation by >> 10 dB, but I am unlikely to find the attenuators cheaply, and buying new >> would add at least $200-$300 to the price, for what I suspect is no >> significant benefit. >> >> Dave >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
