Hi I suspect you will have to hand wind the magnetics.
The 5109 was still in production last time I shopped for them. Bob On Aug 21, 2010, at 1:52 PM, "Mark J. Blair" <[email protected]> wrote: > > On Aug 20, 2010, at 11:17 AM, Rick Karlquist wrote: >> The AMC-123 can also be homebrewed by reading the >> patent, which is listed on the data sheet. > > I found it here: > > http://www.freepatentsonline.com/3624536.pdf > > Having read the patent, I find I'm still weak enough in the area of discrete > amplifier design that I'd have low confidence of creating an amplifier with > the required phase noise, gain, isolation and compression specifications. > Assuming the simple amplifier in Figure 1, I think I'm make or break the > design (more likely the latter) by selecting a suitable in-production > replacement for the 2N5109, figuring out the required turns ratio of > autotransformer L1, biasing the transistor amplifier correctly, etc. > > I'd have no problem building it; if I identified off-the-shelf magnetics then > I could even build a whole bunch of them, as I design PCBs for a living > (mostly GPS stuff; I can lay out the microwave stuff as long as a smart RF > guy comes up with the necessary LNA circuit topology), and I even have a bit > of experience designing mechanical stuff (i.e., in case it wanted to be in a > nice machined aluminum shield/heat-sink box, though my CNC mill is presently > in pieces so I'd need to farm out mechanical fabrication). I'm just weak in > the analog/RF design area so far. > > Since the "Q: Which amplifier? A: AMC-123!" thing appears to be a FAQ, and > that patent may be old enough to have expired, I wonder if the world wants a > nice plug-and-play TIME-NUTS-123 amplifier based on the Norton patent, > designed with currently-available off-the-shelf components (aside from the > custom PCB and possibly enclosure), which could be made in smallish batches, > characterized by somebody with the right equipment, and sold at a reasonable > price to help folks cobble together their home-brewed phase noise measurement > and frequency reference distribution systems. > > -- > Mark J. Blair, NF6X <[email protected]> > Web page: http://www.nf6x.net/ > GnuPG public key available from my web page. > > > > > > _______________________________________________ > 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.
