Chris So you also must run the gatesgarth website. I was thinking there might be other good tidbits. The EIP manual was nice. Good job on the control signal. I had a chance to reread the theory of operation yesterday (Well parts) and if band 2 is now working by cheating at least, then it would be interesting to look at band 3 and see whats going on. There seems to be 3 variables that control operation. 1 you have experimented with the next is the band 2 or band 3 selection and then the 3rd is how the system searches for a signal in either band. This seems to be a diode detector in the front end and a diode detector in the IF. When a signal is detected at the front and the signal in the IF is larger the system says I have a signal in the correct down conversion band. The operational logic diagrams are far more clear. So the trick in band 3 would be to look at the IF rf diode and see if it ever has a voltage. That would give a hint as to what direction to look in. Sure you could look at the LO with a spectrum analyzer and see if it was correct also. You just might not have one. :-) Regards Paul WB8TSL
On Fri, Dec 7, 2012 at 5:22 AM, Chris Wilson <[email protected]> wrote: > > > > > > <SNIP>______________________________________________________________ > > > This is where I am now, I hope the above makes some sense if > > viewed with the service manual and the schematics. Thanks. > > > > > 07/12/2012 10:17 > > Latest update: > > Removed Q12 from board A109 and put a 1k resistor across vacant > emitter and collector board holes, thus putting 12 volts into the > mixer to switch it externally. Counter now works perfectly on Band 2 > and I followed the signal path from R2 / R3 junction (wrong impedance, > but a reference nonetheless) through to the anode of CR3. > > Hopefully self explanatory with regard to file names, scope patterns > are at http://www.gatesgarth.com/scope/scope.zip > > Pretty stuck as to where to go next now. > > > > -- > Best Regards, > Chris Wilson. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
