If you have another channel element that has a crystal, I would use it to determine if the problem is in the radio or the element. I suspect that the bad capacitor is in the element.
What is the part number of the channel element? 73 Glenn WB4UIV At 10:03 PM 8/9/2010, you wrote: >Glenn, >Is it safe to say look in the channel element for the bad cap ? >Tempeture is not a issue with this unit it was in a heated and A/C >garage kept about 65-80 degrees with dehumdifer. I am glad the new >site is climate controlled also. > >Ryan n3ssl > >--- In Repeater-Builder@yahoogroups.com, Glenn Little WB4UIV ><glennmaill...@...> wrote: > > > > We had this problem in Johnson radios. > > What it turned out to be was a plate of a silver mica capacitor > > coming disconnected internally in the capacitor. > > This caused the capacitor to shift to a lower capacitance by the > > amount that the plate contributed to the capacitor. > > The lower capacitance caused the radio frequency to shift high and > > outside the tuning range of the netting device. > > I cannot tell you what capacitor has failed. > > Check the silver mica capacitors in the tuning circuit and replace > > the one that is low in value. > > > > I also have not been in a Micor element in many years. > > > > Hope this helps. > > This appears to be a somewhat common failure for silver mica > > capacitor due to the way the capacitor is physically constructed. > > > > 73 > > Glenn > > WB4UIV > > > > > > At 09:09 PM 8/8/2010, you wrote: > > >Glenn, OZ and group > > > > > >Its a step jump 5 khz up and get - 200 hz of crystal movment. What > > >silver mica Cap is it? I have not looked inside a channel element in > > >years usally send them out and trust the mfg. > > > > > >I also gave the crystal movement a thought but was is a temp > > >controlled enviroment. > > > > > >Ryan > > > > > >--- In Repeater-Builder@yahoogroups.com, Glenn Little WB4UIV > > ><glennmaillist@> wrote: > > > > > > > > Was the shift a drift or a step jump? > > > > > > > > If a step jump, you probably have a bad silver mica capacitor. > > > > > > > > 73 > > > > Glenn > > > > WB4UIV > > > > > > > > At 04:23 PM 8/8/2010, you wrote: > > > > >Hi Group, > > > > > > > > > >I have a Micor mobile set up as repeater. Worked great and was on > > > > >frequency for over 8 years no problems.(lost rpt site May 2010) and > > > > >have a new site to get on.The problem i am having is the TX drifted > > > > >5 khz up on TX from 145.310 to 145.315. I get plenty of deviation > > > > >and audio drive and 9.6 v to crystal element. I am not having any > > > > >luck messing with Netting adjustment i get -200 hz max. I also have > > > > >a UHF Rx unit for control installed and it is 10khz low on frequency. > > > > > > > > > > > > > > >The 144.710 RX crystal is right on the money for specs. Very odd > > > > >situation. anyone have ideas where to check or a fluke the crystals > > > > >are both bad. > > > > > > > > > >Ryan n3ssl > > > > > > > > > > > > > > > > > > > >------------------------------------ > > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >------------------------------------ > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > >------------------------------------ > > > >Yahoo! Groups Links > > >
