A couple of basic things come to mind:
1. Do you have the PL encoder plugged into the exciter? If not, did you
install the jumper in the exciter board?
2. Did the station originally have the F1-PL card? It provides one (or
more) keying voltages, but I'm not in the office and I don't remember which
for sure, but it may be oscillator ground or one of the "keyed" voltages.
The fact that you see PA power start to come up but then it dies shortly
thereafter almost makes it sound like it's NOT a control logic problem, but
then later you said that you're missing keyed A- so that contradicts that
notion. As a test, "pull up" the PA power control line to A+ through a
low-resistance (say, 4.7 ohms), key the station, and then while it's still
keyed, disconnect the pull-up. Does it continue to make power, or does it
drop out?
The power control board will shut down the PA by killing control voltage if
it doesn't see power output come up fast enough; I'm wondering if that's
what you're experiencing. You could have a bad diode or other problem in
the antenna network which results in the power control board thinking there
is a PA problem so it shuts it down. Put a voltmeter on the sense voltage
lines going to the power control board to verify they're good (you'll have
to "pull up" the control voltage to get the PA to make power to take those
measurements).
By the way, are you using the stock supply or something else? And which PA
(power level) do you have?
If you can't get it to fly, drop me a private email and I'll get out the
"orange book" to refresh my memory on the keying logic next time I'm in the
office.
--- Jeff WN3A
> -----Original Message-----
> From: [email protected]
> [mailto:[EMAIL PROTECTED] On Behalf Of
> [EMAIL PROTECTED]
> Sent: Sunday, December 30, 2007 5:53 PM
> To: [email protected]
> Subject: Re: [Repeater-Builder] Re: Micor Repeater (i hope)
>
> Hi All
> Building a Micor Repeater from Scratch
>
> Facts.
> Mother Board (unified Chassis ) origin unknown. Had to add a
> jumper for +12Volt to RX.
>
> Rx with audio works fine. Not using pl board ( control system does PL)
> Have great local speaker vol and squelch.
>
> Exciter, Tripler, PA and circulator all are in working order
>
> Have the following modules in the following slots counting
> from the right front.
>
> Audio Line Driver Slot 1
> Station Control in Slot 2
> Squelch gate in Slot 7
>
> I can Key the transmit on the station control module
> The exciter and tripler key up and make power
> PA power comes up about 2 watts and drops off
> Power Control module check out in a known good complete Micor
> repeater.
> Control Transistor is good and plugged in correctly. Checked voltages
> Missing (- A Key ) minus A Key on the control module.
> Station Control Module (-A key ) does NOT come up.
> Station Control Module works in a known good micor repeater.
>
> I can add +12 volt to PA control terminal on the PA and PA
> makes lots of Power on the correct frequency but that
> bypasses the Circulator SWR protect etc
>
> The intent of the whole mess is to use the minimum of the
> Motorala modules since the
> Sierra Radio Control system has provisions for Squelch, PTT,
> RX and TX pl etc
>
> any Ideas??
>
> Ralph, W7HSG
>
>
>
>
>
>
> Internal Virus Database is out-of-date.
> Checked by AVG Free Edition.
> Version: 7.5.503 / Virus Database: 269.17.5/1190 - Release
> Date: 12/19/2007 7:37 PM
>
>
>
