Yes, I have two 1900's at the moment and had to replace the final output MMIC in both of them. The original is an SHF-0186 made by Sirenza. As it's no longer manufactured and Aeroflex wants almost $90 for this $3 part, I replaced them with a Mini-Circuits ERA-6+. Since the ERA-6+ is a 5 volt unit as opposed to the 8 volt original, I had to change a couple of dropping resistors also.
After this along with a couple of other repairs and a complete calibration they both work well and pass all of their self tests. I just know that sooner or later I'll experience a failure on the one I keep that will require a schematic to diagnose. Maybe by then Aeroflex will be less possessive of the schematics. Thanks, Eric _____ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of DCFluX Sent: Tuesday, July 08, 2008 4:29 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] IFR 1900 Schematics I couldn't find any. The block diagram for the COM-120C is kinda close. If you transmitted into the Aux port, and the step attenuator was at a fairly high level of output, you will need to replace the MMICs in the generator module. http://blog. <http://blog.myspace.com/index.cfm?fuseaction=blog.view&friendID=85474861&bl ogID=394848267> myspace.com/index.cfm?fuseaction=blog.view&friendID=85474861&blogID=39484826 7 On 7/8/08, w2zt <[EMAIL PROTECTED] <mailto:w2zt%40comcast.net> net> wrote: > Does anyone know of a source for the IFR-1900 schematics? I have each > of the Service, Calibration & Operating manuals, however, schematics > are not within them. > > I assume this is because Aeroflex still supports the units for a > lucrative fee and doesn't want competition. > > Thanks, Eric >_,_._,___
