Hi Steve, Please tell me more about the frequency "jumpiness" of your PTO...
I had the very same thing happen to the frequency of my T4X transmitter, thought I had it cured, & then discovered yesterday, to my complete chagrin, that it has returned with a vengeance. BTW, the zener diode in the T4X is INSIDE the PTO can---sounds like the previous owner did some "...after-the-fact" work on that unit...but then how did he remove the original one inside the can on the other side of the board...? And why didn't he just place the new one where the original was...? ~73~ de Eddy VE3CUI - VE3XXZ ***************************************************************************************************** On 2011-07-04, at 3:33 PM, Steve Wedge wrote: > I finally pulled my R-4A out of its place on my operating desk and got the > covers off. As I was undoing the nuts in preparation for PTO removal, I > noticed that there was a 10V zener on the small board that the wires from the > PTO connect. I also noticed that one end was broken but still touching its > connection. > > A couple of things come to mind. First, the schematic and comments I've > heard from others on this list strongly suggest that the zener should be > inside the enclosure. Second, if that's true, then a previous owner tried to > correct my "frequency-jumping" problem by installing the zener externally to > the enclosure to avoid the extra work. Could it be possible that the zener > inside the enclosure is still behaving erratically and intermittently > conducting at some voltage below that of the external zener? I haven't > pulled the receiver back off the desk (arggggh...) yet and wanted to get a > general opinion. > > Am I right in assuming that this zener - which was installed on the back-side > of the little board - was added on? > > Steve Wedge, W1ES/4 > > "I can't complain, but sometimes I still do." > - Joe Walsh > > If the above message appears, it came from Steve's Son of Laptop! > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist
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