You can get started by pulling all the channel elements and put a known good channel element crystaled up somewhere in the range where the RX is tuned up right now into the F1 position.
Then clip lead the back side of the control connector from pin 1 to pin 4. Make sure that the other end of the wire on pin 4 is floating. This clip lead forces F1 on. Then see if you have a good level on meter 6 (local oscillator injection). If you don't have a Micor test set you need one. The low-end test sets made for installation into a Micor base turn up on ebay all the time and go cheap - look at <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3820601619> and at <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3820406618> for an example. Or just use a 40ua meter from the meter 6 test point to ground. Make sure you are on the LO injection test point - trace the schematic and the PCB layout diagram in the manual. It's too easy to get across a power pin by accident and that will smoke a 50ua meter. If you have good injection level make sure the PL decoder is off (i.e. in carrier squelch) and see if it hears your HT. Even if the RX front end isn't exactly peaked on channel it should hear a watt or so into a rat tail antenna 6 inches away. Mike WA6ILQ At 01:59 PM 6/12/04 -0700, you wrote: >Thanks Mark, that would help. I am sure it is something minor. I want to >try and convert one of these to see just how much work is involved. A >project if you will. > >Mathew > >----- Original Message ----- >From: "N9WYS" <[EMAIL PROTECTED]> >To: <[email protected]> >Sent: Saturday, June 12, 2004 1:09 PM >Subject: RE: [Repeater-Builder] Micor 4 Channel Help Needed > > > > Matthew, > > > > I have a manual for the MICOR mobile radio. (I'm assuming this IS a > > mobile?) I'll scan the pages for the wiring pinouts for the control > > heads and send them to you. > > > > Mark - N9WYS > > > > -----Original Message----- > > From: Mathew Quaife [mailto:[EMAIL PROTECTED] > > Sent: Saturday, June 12, 2004 1:27 PM > > To: [email protected] > > Subject: Re: [Repeater-Builder] Micor 4 Channel Help Needed > > > > Well from what I see, that is what I have, the head that has the volume > > and > > squelch also has the 4 channel selector with it, as well as the power > > button. But if I unhook the the scan head, then the volume goes nuts. > > I > > have no way of knowing if this was all that was with it, they were just > > given to me and nothing is know about them. But you are right, without > > the > > pinout locations, I am just working in the dark. Want to see if it > > works > > before I make the attempt to convert it to a repeater. > > > > Mathew > > > > ----- Original Message ----- > > From: "Kevin King" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Saturday, June 12, 2004 10:50 AM > > Subject: RE: [Repeater-Builder] Micor 4 Channel Help Needed > > > > > > > it sounds like you do not have all the assy's for the radio. you would > > need > > > a control group book and a connector tool to rearrange the cables. The > > best > > > bet is to get the rig over to someone close to you that has a working > > test > > > setup to check the rig. Or get a non scanning 4 channel cable and head > > from > > > e-bay. > > > > > > > > > > > > Kevin > > > > > > -----Original Message----- > > > From: Mathew Quaife [mailto:[EMAIL PROTECTED] > > > Sent: Saturday, June 12, 2004 11:58 AM > > > To: [email protected] > > > Subject: Re: [Repeater-Builder] Micor 4 Channel Help Needed > > > or the > > > > > > Let me ask this, I have two control boxes on here, the first is the > > scan > > > head, then there is the actual control head that has the volume > > control on > > > it. The wires you mention are going to the scan head. If I take Pin > > 4 to > > > the connector #11 on the scan head, the volume goes sky high. Pin # > > 11 on > > > the scan box goes to pin 21 on the control cable. Also, what is the > > brown > > > connector used for? That is where the wire comes from pin # 4 is > > going > > to. > > > > > > Mathew > > > > > > ----- Original Message ----- > > > From: "Neil McKie" <[EMAIL PROTECTED]> > > > To: <[email protected]> > > > Sent: Saturday, June 12, 2004 2:14 AM > > > Subject: Re: [Repeater-Builder] Micor 4 Channel Help Needed > > > > > > > > > > > > > > Thank you Mike, > > > > > > > > Neil at 2:14am > > > > > > > > > > > > > > > > Mike WA6ILQ wrote: > > > > > > > > > > Rather than trace everything out, just pop the shell on the > > > > > control cable. > > > > > > > > > > Trace pin 1 and pin 4 up to the head. Pin 1 is ground and is > > > > > hooked to the shield of one or more of the coax conductors in > > > > > the control cable and ends up on pin 21 of the head. Pin 4 is > > > > > frequency 1 and ends up on pin 11 of the head. It is supposed > > > > > to be grounded when the frequency switch is in the #1 position. > > > > > If you have the wrong head for the cable then the frequency > > > > > switch common might not be hooked to pin 1. This is common > > > > > in situations where the installation had a channel scan head and > > > > > the used equipment vendor gives you a standard head. When > > > > > the channel scan board is added the control head frequency > > > > > switch common is rewired and connects through the channel > > > > > scan board and without the board in place the switch common > > > > > isn't grounded. > > > > > > > > > > So just ohm out the F1 wiring and make sure it's hooked up. > > > > > Then make sure that you have good elements in the F1 position. > > > > > Depending on the history of the radio you very easily could have > > > > > the wrong elements for where the radio is tuned. > > > > > > > > > > I once picked up a high-range (42-50mhz) low band Micor that > > > > > had been a Red Cross radio - tuned to 47mhz. The radio had > > > > > mid-range (36-42mhz) elements in it on some fire dept frequency. > > > > > The vendor had grabbed a radio, a random head from a bin, a > > > > > random cable, a random speaker, a random microphone. As > > > > > long as they plugged together he assumed they were compatible. > > > > > They weren't. > > > > > As it turned out, I had a cable that had been pinned for a head > > > > > configuration that had a 8 freq clamshell on the bottom with a > > > > > systems 90 box above it. The box had a multiple PL encoder > > > > > board and a channel-scan board in it. The radio came with a > > > > > 12freq clamshell, the fancy cable, a Mitrek speaker and a bad > > > > > microphone. > > > > > > > > > > It took a while with the Micor mobile book to figure things out. > > > > > > > > > > By the way, > > > > > P901 is the control connector - the front of the radio. > > > > > P902 is the connector between the center of the radio with > > > > > the exciter. > > > > > P903 is the connector between the center of the radio with > > > > > the audio-squelch board. > > > > > P904 is the connector between the center of the radio with > > > > > the receiver. > > > > > > > > > > Mike WA6ILQ > > > > > > > > > > At 11:38 PM 6/11/04 -0700, you wrote: > > > > > > > > > > >Ok, I think I'm getting the picture, it the P-902 the power > > connector > > > in the > > > > > >fron of the radio. On one of them there is a wire that comes > > from > > the > > > board > > > > > >by the transmit xtals that goes to the front of the radio, and is > > > connected > > > > > >to ground. > > > > > > > > > > > >Mathew > > > > > > > > > > > >----- Original Message ----- > > > > > >From: "Neil McKie" <[EMAIL PROTECTED]> > > > > > >To: <[email protected]> > > > > > >Sent: Friday, June 11, 2004 9:17 PM > > > > > >Subject: Re: [Repeater-Builder] Micor 4 Channel Help Needed > > > > > > > > > > > > > > > > > > > > > > > > > > Nope, nope, nope ... > > > > > > > > > > > > > > Exciter: frequency 1 select wire from the Channel Element on > > the > > > > > > > circuit board goes to P-902, pin 15. > > > > > > > > > > > > > > Receiver: frequency 1 select wire from the Channel Element > > on > > the > > > > > > > circuit board goes to P-904, pin 2. > > > > > > > > > > > > > > Those specific pin numbers must be grounded for the receiver > > or > > > > > > > exciter to operate properly. The usual policy was to ground > > the > > > > > > > frequency 1 select on the center board (Control Board) at the > > > > > > > factory on all one frequency radios prior to shipment. > > > > > > > > > > > > > > Neil > > > > > > > > > > > > > > > > > > > > > Mathew Quaife wrote: > > > > > > > > > > > > > > > > If I understand what you are asking, pin one of each board > > is > > > ground on > > > > > > > > here. There is a ground wire on the power connector that is > > > connected > > > > > >to > > > > > > > > ground. Is this what you are referring to. > > > > > > > > > > > > > > > > Mathew > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > > > > From: "Neil McKie" <[EMAIL PROTECTED]> > > > > > > > > To: <[email protected]> > > > > > > > > Sent: Friday, June 11, 2004 8:16 PM > > > > > > > > Subject: Re: [Repeater-Builder] Micor 4 Channel Help Needed > > > > > > > > > > > > > > > > > > > > > > > > > > You may want to determine if the Channel Element > > frequency > > > select > > > > > > > > > wire (one of the pins on the bottom) is properly > > grounded. > > > > > > > > > > > > > > > > > > Look at the bottom of the circuit board immediately > > below > > the > > > > > > > > > Channel Element and locate the one connection that goes > > to > > the > > > edge > > > > > > > > > connector P-902 on the Exciter and P-904 on the Receiver. > > > > > > > > > > > > > > > > > > See that the one wire is grounded. > > > > > > > > > > > > > > > > > > Neil > > > > > > > > > > > > > > > > > > Mathew Quaife wrote: > > > > > > > > > > > > > > > > > > > > Xtal cases seem to be intact, was told they xtals were > > still > > > in > > > > > > > > > > there. Even so, I get no power output, and it does not > > even > > > > > > > > > > register a frequency on my freq counter. So no output, > > and > > no > > > > > > > > > > input. There is one extra plug at the control head, and > > a > > > purple > > > > > > > > > > wire with a connector on it. > > > > > > > > > > > > > > > > > > > > Mathew > > > > > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > > > > > > From: "N9WYS" <[EMAIL PROTECTED]> > > > > > > > > > > To: <[email protected]> > > > > > > > > > > Sent: Friday, June 11, 2004 5:02 PM > > > > > > > > > > Subject: RE: [Repeater-Builder] Micor 4 Channel Help > > Needed > > > > > > > > > > > > > > > > > > > > > I have seen where elements are sent out for > > re-crystalling > > > > > >(different > > > > > > > > > > > freq) and come back with a stick-on label showing the > > new > > > freq. > > > > > >Maybe > > > > > > > > > > > the labels came off, revealing a freq that is no > > longer in > > > the > > > > > > > > element? > > > > > > > > > > > (I've actually had this happen to me before.) > > > > > > > > > > > > > > > > > > > > > > Mark - N9WYS > > > > > > > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > > > > > > From: Neil McKie [mailto:[EMAIL PROTECTED] > > > > > > > > > > > Sent: Friday, June 11, 2004 2:30 PM > > > > > > > > > > > To: [email protected] > > > > > > > > > > > Subject: Re: [Repeater-Builder] Micor 4 Channel Help > > Needed > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Perhaps ... > > > > > > > > > > > > > > > > > > > > > > 1) the Channel Elements are on a frequency that the > > radio > > > is not > > > > > > > > > > > tuned to or ... > > > > > > > > > > > > > > > > > > > > > > 2) there are no crystals in those Channel Elements > > ... > > > > > > > > > > > > > > > > > > > > > > 3) the ground return for the Channel Elements > > selector > > > switch in > > > > > > > > > > > the control head is not connected to ground - > > anywhere. > > > > > > > > > > > > > > > > > > > > > > Neil > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Mathew Quaife wrote: > > > > > > > > > > > > > > > > > > > > > > > > Yes, they are in the 163 Mhz range. When I press > > the > > mic > > > button > > > > > > > > > > > > the radio keys up, just no power output. > > > > > > > > > > > > > > > > > > > > > > > > Mathew > > > > > > > > > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > > > > > > > > From: "Neil McKie" <[EMAIL PROTECTED]> > > > > > > > > > > > > To: <[email protected]> > > > > > > > > > > > > Sent: Friday, June 11, 2004 10:44 AM > > > > > > > > > > > > Subject: Re: [Repeater-Builder] Micor 4 Channel Help > > > Needed > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Are there any Channel Elements in it? > > > > > > > > > > > > > > > > > > > > > > > > > > Neil > > > > > > > > > > > > > > > > > > > > > > > > > > w9mwq wrote: > > > > > > > > > > > > > > > > > > > > > > > > > > > > I just got a 4 channel micor radio, T73RTN3180B > > radio, > > > > > >actually > > > > > > > > > > > two > > > > > > > > > > > > > > radio's and one set on control heads. The radio > > comes > > > on, > > > > > >has > > > > > > > > > > > good > > > > > > > > > > > > > > volume, and squelch works, but there is no > > receiver > > > > > >sensitivity, > > > > > > > > > > > nor > > > > > > > > > > > > > > power ouput. Both radios do the exact same > > thing. > > > I'm > > > > > >thinking > > > > > > > > > > > > > > control head, but everything seems to be hooked > > up. > > > > > > > > > > > > > > > > > > > > > > > > > > > > Mathew 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/
