I've been reading a bit on YIG oscillators, very interesting devices! http://www.vhfcomm.co.uk/pdf/A%20Simple%20Approach%20tyo%20YIG%20Oscil.pdf The above suggests that some W-J Oscillators require a -14.2v negative supp= ly rather than the usual -5v. Could this be causing your reduced frequency= range? I presume that since your device has a 9 way D type connector it has a buil= t in driver, much like the WJ device pictured in the above PDF? Have you h= ad a look inside the case? The author suggest the operating voltages are u= sually printed on the actual oscillator. Regards Mike > -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf > Of Sean Breheny > Sent: 03 October 2009 19:22 > To: Microcontroller discussion list - Public. > Subject: Re: [EE] Watkins-Johnson YIG Oscillator > = > Thanks for your reply, Mike. > = > I looked at those sites but didn't find this model listed. I got some > help from a guy named John Miles who has a web site about microwave > experimentation. With his input, plus some reverse-engineering, I > finally got the device to work. Here is the pinout I was able to > determine: > = > 1 - V tune + > 2 - V tune - > 3 - FM coil (polarity not yet determined - about 1 ohm resistance) > 4 - FM coil > 5 - +15V > 6 - -5V > 7 - Heater (using 22V just fine - drawing only about 20mA after warmup > of a few seconds) > 8 - Heater > 9 - Gnd > = > It seems that V tune + and V tune - are OK if isolated from ground, > and connecting V tune - to ground still works but alters the input > impedance of V tune + a bit. > = > I am getting oscillation when V tune is between 2.5V and 10V. Seems > like around 50 to 100K from V tune+ to V tune -. > = > The amplitude is fairly constant between about 7dBm and 10.5dBm. > Interestingly, the higher frequency end is higher amplitude, slightly. > = > I am puzzled, though, and a bit disappointed that I am only getting > output from 2.17 to 7 GHz (linear between 2.5V and 10V input). The > rating is 2 to 8 GHz on the top of the device. If anyone has any ideas > on what may be going on here, that would be great. > = > Sean > = > = > = > On Fri, Oct 2, 2009 at 10:40 AM, Michael Rigby-Jones > wrote: > > > > > >> -----Original Message----- > >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On > > Behalf > >> Of Sean Breheny > >> Sent: 02 October 2009 01:54 > >> To: Microcontroller discussion list - Public. > >> Subject: [EE] Watkins-Johnson YIG Oscillator > >> > >> Hi all, > >> > >> I recently bought a surplus microwave YIG oscillator made by > >> Watkins-Johnson. Model WJ6708-7DF. Date code 8521. 2-8GHz. > >> Unfortunately, I have no additional data on it. It uses a DB9 male > >> connector for all signals/power except for the SMA RF output. The > >> company I bought it from said that they do not have a datasheet. Does > >> anyone know where I might find at least a pinout? > >> > >> Thanks, > >> > >> Sean > > > > The Triquint website has a large number of technical documents from > > Watkins-Johnson, though they are mostly very dark scans. =A0Lots of stu= ff > > on YIG tuned oscillators, so you might strike lucky. > > > > http://www.triquint.com/prodserv/tech_info/WJ_tech_publications.cfm > > > > > > A search through http://watkins-johnson.terryo.org/ may also yield > > something. > > > > Cheers > > > > Mike > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > This e-mail is intended for the person it is addressed to only. The > > information contained in it may be confidential and/or protected by > > law. 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