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.viewfriendID=85474861bl
ogID=394848267
myspace.com/index.cfm?fuseaction=blog.viewfriendID=85474861blogID=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
_,_._,___
