While the page at <http://www.repeater-builder.com/ge/mastrII/m2icoms.html> is oriented towards GE radios and the ICOMs, if you scroll down to the section starting at "Notes on Temperature Compensation" and mentally replace "Icom" with "channel element" it applies.
Mike WA6ILQ At 11:09 AM 05/13/06, you wrote: >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 > > > > 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/
