| Sean Breheny Fri, 02 Oct 09 03:53:36 +0300 | 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 |
| 2 replies folowing | |
| Michael Rigby-Jones Fri, 02 Oct 09 17:40:02 +0300 | > -----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. Lots of stuff 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 ======================================================================= 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. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= |
| Sean Breheny Sat, 03 Oct 09 21:21:57 +0300 | 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 > > >> -----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. �Lots of stuff > 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 > > ======================================================================= > 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. If you are not the intended recipient of this message, you must > not make any use of this information, or copy or show it to any > person. Please contact us immediately to tell us that you have > received this e-mail, and return the original to us. Any use, > forwarding, printing or copying of this message is strictly prohibited. > No part of this message can be considered a request for goods or > services. > ======================================================================= > > -- > > > > |