The good receivers do seem to use I+Q. Usually the signal is I and in the 8170 I believe is used to generate the time code. Its not specifically a Freq rcvr, though I think you can get to everything you need to pull a reference out for comparison. The Q is generally used for the AGC. So I might guess the trick would be generate a local 60 KC sig jam it in and see if it tracks the sig. By being local you could make it large enough to allow easy troubleshooting with a scope without wwvb typical propagation variables. That would let you insure that the AGC is working correctly. I had downloaded the 8170 manual also as potentially I will have one sometime soon. Regards Paul WB8TSL
On Sat, May 28, 2011 at 4:58 PM, Paul A. Cianciolo <[email protected]> wrote: > Hello Paul, > > Yes.... I forgot to mention that I have a ferrite resonant antenna with > very good SNR. > The receiver also displays code in the left digit of the display like the > manual says but with about 20% errors which is the digit 4 > I don't think the antenna is the problem, I have built nearly 100 of these > over the years and they are in use on many different receivers. > > I don't a lot about these I&Q detectors and I believe the problem may be in > one of those. > > > Paul A. Cianciolo > W1VLF > http://www.rescueelectronics.com/ > Our business computer network is powered exclusively by solar and wind > power. > Converting Photons to Electrons for over 20 years > > > > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of paul swed > Sent: Saturday, May 28, 2011 4:17 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Spectracom 8170 Receiver Trouble Requesting help > please > > Paul > I do not own one of these but perhaps soon. > Many of the vlf receivers required a pre amplified antenna. Typically a > loop. Not saying that yours does. But if it were missing that could make > things difficult. > Paul WB8TSL near Boston > > On Sat, May 28, 2011 at 2:38 PM, Paul A. Cianciolo <[email protected]> wrote: > > > Hello Folks, > > > > > > > > This is my first post to the list and I appreciate being able to do so. > > > > > > > > I recently acquired a Spectracom 8170 WWVB receiver. > > > > The manual is available at the Spec. site and I have downloaded it, > > and been reading through it. > > > > > > > > One of the problems is the lock light comes on almost immediately when > > the RX is powered up with no antenna connected. > > > > Also there is a purple wire on the A2 board, pin 6 of J5 that has been > > fitted so it can be removed and reconnected from J5 easily. > > > > This appears to be the synchronous AGC line back to the preamp board. > > > > > > > > In addition R30 on the A2 board has been adjusted. I think this is > > carrier null. > > > > Power supplies are all within .1 volts of 12vdc -12vdc and 5 VDC. > > > > > > > > Looking for some direction from owners of this RX. > > > > > > > > Thank you > > > > > > > > Paul A. Cianciolo > > > > W1VLF > > > > http://www.rescueelectronics.com/ > > > > Our business computer network is powered exclusively by solar and > > wind power. > > > > Converting Photons to Electrons for over 20 years > > > > > > > > _______________________________________________ > > 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. > > > > _______________________________________________ > 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.
