Hello ...
Kevin Berlen wrote:
... snip ...
> The receiver in your machine is basically a Mitrek. One thing to
> look for that can cause intermittent problems are the ground
> connections on the coils in the front end casting. The joints can
> fracture and cause very intermittent RX sensitivity problems. Don't
> over look the two injection filter resonators that are part of this
> assembly. Get a friend and a couple LARGE soldering guns and
> resolder all of these connections. It will take a large amount of
> heat, but make sure that the solder flows properly and that the
> entire joint is fluid before you remove the heat. Following this
> repair, be prepared to touch up the aligmnment on the front end.
This is a serious issue - about 30 years ago, the Motorola UHF
Motrac receiver front end castings had a similar problem.
The fix I used was to carefully remove the casting from the
receiver, take the top plate with the adjustment screws off and set
it aside. A trip outside and a propane torch reheating the entire
front end assembly, tightening the helical resonator screws and
flowing fresh solder on all the connections fixed the problem.
Neil - WA6KLA
>
> I hope this is useful information for you. Good luck, and 73,
>
> Kevin, K9HX
>
> At 09:00 AM 9/7/2004 -0500, you wrote:
> >I have an MSR2000 on 444.550 for the local ham club / county EMA.
> >The PA (a 110W model) is out again. We just had this repaired by
> >the local Motorola shop, with whom we've had very good results
> >from in the past. We're running the PA at about 80W, so I'm
> >thinking we didn't "burn it up", but I can't help but wonder if
> >there is anything inherently wrong with the MSR2000 PA for UHF.
> >This is the third time the PA has failed in this particular
> >machine in about a 2-year time frame. (This was a repeater
> >originally tuned for 460 MHZ, and brought down to the ham band.)
> >This particular machine has been a pain in the @$% - RX
> >sensitivity isn't what it should be, PA keeps going out, etc.
> >Seems like we're up at the site every couple of months do make
> >some sort of repair on it.
> >I'm wondering if we should just cut our losses and get another
> >machine, or should I keep plugging away at this repeater? If we
> >do decide to chuck it, how much can I expect to spend to get a
> >comparable replacement - we use this machine during severe weather
> >season for forwarding reports to the NWS, and it's open other
> >times. We want to add remote RX sites (you've probably seen my
> >inquiries about those in the past) but I don't want to start
> >adding remote RX sites until I get the main repeater working
> >reliably.
> >I'm open to suggestions...
> >Thans,
> >Mark - N9WYS
> >
>
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
