Re: [Repeater-Builder] Re: Mystery Micor problem
If it wasnt Friday the 13th and I wasnt a bonehead and left my shop keys at home - I would check our stash for you. Can you wait til MOnday and I will? John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn - Original Message - From: n3ssl To: Repeater-Builder@yahoogroups.com Sent: Friday, August 13, 2010 8:08 AM Subject: [Repeater-Builder] Re: Mystery Micor problem Glenn and Group, You were right on the channel elment being the issue ( placed a kxn 1024 for uhf and right on Rx.) Now i am looking for a KXN 1019 VHF not finding any in boxes or ebay. anyone have one they can spare? Ryan n3ssl --- In Repeater-Builder@yahoogroups.com, Glenn Little WB4UIV glennmaill...@... wrote: 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 glennmaillist@ 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
Re: [Repeater-Builder] Re: Mystery Micor problem
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
Re: [Repeater-Builder] Re: Mystery Micor problem
On 08/08/2010 08:09 PM, n3ssl 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 mailto:Repeater-Builder%40yahoogroups.com, Glenn Little WB4UIV glennmaill...@... 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 Glenn's spot on.
Re: [Repeater-Builder] Re: Mystery Micor problem
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 glennmaill...@... 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
