I had Planned to eventually convert the 5 Mhz output I added from J8 on the Lucent RFTG-u REF1 (that I described previously) to 10 Mhz. Since I made that 5Mhz modification 4 years ago I have been using the 5 Mhz sinewave output for some of the equipment I have around the bench that can use it directly plus I have a modified Spectracom 8140 distribution amp that take a 5Mhz input and will output a clean 10Mhz sine wave.
The 5-10Mhz doubler circuit described by John Roos seems like a good way to accomplish what I wanted to do. I started looking around for parts I might already have that I could use to construct the circuit and I found a lot of what I needed. Having dismantled about 200 of the wireless locator units that held the Thunderbolts that I sold on Ebay, I had a large pile of the machined R.F. subassemblies left over and they had a large number of MCL (Micro-Circuits) and other really neat R.F. stuff. I found a MCL RMS-2 (5-1000 Mhz) mixer that would work well for the mixer and then found a 10Mhz 2-stage amp with filters on one of the circuit boards that should give me the clean 10Mhz sine wave that I want. I have tried the amp and it seems to work well. When fed with either a sine or a square wave the output is a clean sinewave that can drive 50 ohms. The power required is +/-7VDC at low current and that voltage goes to 2 on-board regulators to provide +/-5VDC that supply the 2 amps. Feeding the +/-15VDC from the REF 1 power supply through two 200 ohm resistors provides the +_7VDC for the amps' on-board regulators. The inductors I need for John Roos's 90 degree phase shifter circuit should be here in a couple of days and then I can permanently mount the amp board right behind the front panel connectors near the middle of the REF 1. On the outside chance that the unit actually needs the 15MHZ signal for some purpose this added board will not affect that signal in any way. At least for me this is a good solution. Here is a link to a photo of 2 different revisions of the board, one with a discrete lowpass filter and one with the MCL SCLF-10.7 package. After stripping off the other stuff I don't need there is plenty of room for the rest of the parts from John Roos's circuit. -Arthur http://i906.photobucket.com/albums/ac262/rjb1998/Amps2_zpsf115c599.jpg _______________________________________________ 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.
