Hi Ok, so how does that make a BC-221 a wave meter?
Bob > On Feb 12, 2017, at 7:15 PM, Wes <w...@triconet.org> wrote: > > On 2/12/2017 12:51 PM, Bob Camp wrote: >> Hi >> >> Maybe I’ve been wrong for the last many decades … >> >> To me a wave meter is a tuned circuit device that tells you the frequency by >> a resonance >> peak. They are a very common old school item for microwave frequency >> measurement in >> a teaching setting. >> >> https://www.britannica.com/technology/wavemeter >> >> Bob >> > As I said before, there were cavity wavemeters used in industry. I've > attached a couple of pictures that show some in action. In both photos I > (with the tie) and my partner are working on a prototype IMPATT diode power > amplifier for the AIM-54C Phoenix Missile. This used 16 matched IMPATT > diodes in an X-band cavity. At this point it is actually a free-running, > pulsed oscillator. In the final usage it was injection locked to a three > diode oscillator which in turn was driven by a single diode that was locked > to a GUNN oscillator. These were all connected via a five-port circulator. > The GUNN was phase locked to VCXOs at about 100 MHz, multiplied 96 times to > X-Band. > > Since this was free-running the frequency measurement accuracy of a cavity > wavemeter was adequate. In photo 2 the wavemeter is the grey cylinder with > the black top just in front of the lab notebook. In operation it was tuned > and caused an amplitude notch that was detected with a waveguide-mounted > diode. > > In the other photo there is another wavemeter on the test station behind me > among some waveguide attenuators and phase shifters. Maybe of interest to > frequency nuts is the transmitter-receiver unit from the production AIM-54A > missile. It is just "above" the bend of my elbow. There were seven, pie > shaped VCXO circuit cards in a temperature-controlled chassis. Maintaining > frequency accuracy under launch shock and the vibration from hanging on the > wing of an F14 at Mach 2 was lots of fun. > > Wes > <Wes_Roy_Hughes_2.jpg><Wes_Roy_Hughes_1.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. _______________________________________________ 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.
