Hi Yuri, I don't know about thr transformers you have, but a useful source of a very usable triple 1:1 50R transformer is an old 10base2 Ethernet card (the type with a BNC) these cards have a standard design that calls for isolation. They also yield a 5 (or 12) volt to 9V isolated DC-DC converter. Robert G8RPI.
--- On Tue, 16/12/08, Yuri Ostry <y...@ostry.ru> wrote: From: Yuri Ostry <y...@ostry.ru> Subject: [time-nuts] RF transformers for distribution amplifier To: time-nuts@febo.com Date: Tuesday, 16 December, 2008, 11:27 AM Hello, Just digged in my junkbox(es) in hope to find something to quickly build distribution amp for Rb module that I just received from fluke.l. Figured out that I'm pretty short in fast opamps, but found considerable quantity of Mini-Circuits TC1-6-75-1 SMT wideband transformers (same as sold now by someone on eBay for US $17.49 for lot of 200 as item #110259000213). Here is some more detailed specs that good people from Mini-Circuits provided a year or so ago.... > The P/N TC1-6-75-1 is a Mini-Circuits custom design for one of our > cust's. However, this model was made available for other customers > as well. > > The specs are as follow: > Frequency: 5 - 50 MHz > Impedance ratio: 1:1 > Impedance: 75 ohms nominal > Insertion Loss: 0.5 dB maximum > Input Return Loss: 14 dB typical > Maximum RF Input Power: 15 mW > Operating temperature: 0 to 70 degrees C > > All electrical specs measured with 0 mA DC current > > Case style: AT224 > Pinout: (same as TC1-1) > Primary dot = pin 6 > Primary = pin 4 > Secondary dot = pin 1 > Secondary = pin 3 > Not used = pin 2 I'm in doubt... I'd like to get about 1 volt p-p on a 50 ohm load from amplifier outputs, and it looks like that this transformer may be "overdriven" a little bit. Can it cause any serious problems? -- Sincerely, Yuri mailto:y...@ostry.ru _______________________________________________ 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.