yes over the years I had the same to say about Bomar in both the Mitrek and the Micor repeaters we used them in. no problems after the first day of operation.
----- Original Message ----- From: "skipp025" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Saturday, May 13, 2006 1:42 PM Subject: [Repeater-Builder] Re: Mitrek Channel Elements Wanted >I really don't care to argue in favor of one method vs > another, but I will say I've redone easily over 200 > Mitrek Channel elements with rocks from Bomar and ICM. > > I've never had a problem with any of the rocks from > both mfgrs. > > Typical for a self - re-rocked channel element... the > crystal will drift a small amount when first put into > service (excited). In the relative world it settles > down after an hour, two or three. I always reset F_center > a few hours later when time and the site location permit. > If I have the luxury of time or site access, I'll reset > the channel element after a day or two of continued > operation (excitation). > > Frequency checks after a few weeks of operation might > show the Fc to have settled in/at a location withing a > few hundred hertz of the original F_set. > > After two or three months, frequency drift is very > minimal. Thermal drift after the initial operation > time is also very minimal. > > In the early days, I had ICM do the full number for us. > The performance results are similar, it's my opinion ICM or > Bomar simply take the initial operation drift as described > above and remove it from the customers view during their > age or initial excitation process. The mentioned in > addition to some temp tracking and circuit changes to the > channel element where required. > > All said and done, I've not had a problem with temp drift > in re-rocked channel elements after the practical settle > time. Once set F_center pretty must stays put over the > normal expected operating range. > > Cheers, > skipp > > ps: such was not the case with Jan, Crystek or Cal-Crystals > as experienced by myself and other friends using said... > > pss: The frequency drift described by/in the initial post > is not normal, something is/was done wrong. > >> "Eric Lemmon" <[EMAIL PROTECTED]> wrote: >> Rich, >> >> I wonder if someone simply re-crystaled your channel elements, >> and did not have them compensated to match the crystals. A >> properly compensated channel element will normally drift no >> more than a few hundred Hertz after it has been in service >> for a while. Try sending one set of channel elements to ICM >> for re-crystaling and full compensation, before assuming that >> you have "bad" channel elements. >> >> Sometimes, just changing the crystal will work- but it is >> always a gamble that the compensation already in the channel >> element will not be a lot different from what the new crystal >> requires. It's not worth taking the chance, IMO. >> 73, Eric Lemmon WB6FLY >> >> -----Original Message----- >> From: Repeater-Builder@yahoogroups.com >> [mailto:[EMAIL PROTECTED] On Behalf Of Richard Sauer >> Sent: Friday, May 12, 2006 2:11 PM >> To: Repeater-Builder@yahoogroups.com >> Subject: [Repeater-Builder] Mitrek Channel Elements Wanted >> >> I'm looking for some "high stability" Mitrek channel elements >> to use in several link and repeater transmitters we have. The >> part number is KXN-1095. >> >> I can use about 15 of these channel elements. >> >> The standard elements we are currently using are not very stable and >> allow the transmitter to drift +/- 5 kHz as the transmitter heats up. >> >> Any help in locating these would be much appreciated. Feel free to >> contact me off-list. Thanks. >> >> Rich, N6CIZ >> >> >> >> >> >> >> >> >> >> >> >> >> >> Yahoo! Groups Links >> > > > > > > > > > > Yahoo! Groups Links > > > > > > > > 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/
