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 > > > > 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/
