Alright Ray we can gang up on you with two of us. By the way with respect to a BPSK modulator as mentioned I did just did that and without any special driver chip. I used a ttl 7474 to synchronize the 60 KHz reference to the incoming data. Data in to D and 60 KHz to C, Q and QNot to 180 ohm R to drive the diodes. Most likely this could go to 90 ohms and perhaps allow 0 dbm in or higher. But did not need that level as I needed to drop to at least -50 db for the KD2BD receiver I am working on. The reason to use the driver chip in the d-psk-r is with the higher voltage I can get more driver port isolation. Regards Paul.
On Wed, Aug 19, 2020 at 11:40 AM Rodger via time-nuts < [email protected]> wrote: > Ray, > > I'll answer your question as I've done this. The d-psk-r's intended use is > to remove the bpsk from the WWVB carrier for the purpose of allowing older > WWVB receivers to recover phase info from the carrier and it works very > well > for that purpose. But, it can also be used, as you are trying to do, to > generate "something similar" to the WWVB BPSK signal by feeding it 60 khz > and letting the mixer do the phase modulation. I've done it, and it works. > But there would certainly be some differences between that signal and the > "real" WWVB BPSK. For one, the real WWVB signal has phase coherence > between > the 60 khz and the timing of the phase flips. You won't get that with the > d-psk-r as it's not necessary for it's intended purpose. Obviously WWVB > also has the AM component too so that would be missing if using the d-psk-r > to modulate a carrier. > > But depending on your intended use, I see no reason that using the d-psk-r > as a "re-psk-r" shouldn't work just fine. > > If you're putting a sine wave in to the mixer on pin 8, you should be > seeing > a sine wave out on pin 1. It's as simple as that. And that sine wave > should shift 180 degrees (invert polarity) if you flip the polarity of the > bias on pins 10 and 15. If you don't have any DC bias on pins 10/15 I'm > not > sure how much signal would pass through the transformers though I don't > think it would be much as neither pair of diodes would be conducting. > > Good luck, > > Rodger > > -----Original Message----- > From: time-nuts <[email protected]> On Behalf Of > [email protected] > Sent: Wednesday, August 19, 2020 2:20 AM > To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] WWVB PM Time Questions > > Paul, > > Yes, I built the d-psk-r per the schematic. However, I think I did not > understand how it actually worked. I was expecting it to be able to > duplicate the WWVB sine wave signal with the phase reversal present when > the > PM data bit changed from a 0 to 1 or 1 to 0. I have a 60 kHz sine wave > going > into pin 8 of the mixer transformer. I expected to see a sine wave out of > pin 1. > > However, I looked at the code again and it appears the "LO" port of the > mixer is only driven one per second. There is no steady drive to the "LO" > port so there cannot be a sine wave out of the "IF" port. Is that correct? > > Or should there actually be a 60 kHz sine wave coming out of pin 1 on the > mixer? If so, something is wrong with my d-psk-r. I am not trying to use it > with any kind of receiver. I just want to see the sine wave on my scope. > > Ray, > AB7HE > > -------- Original Message -------- > Subject: Re: [time-nuts] WWVB PM Time Questions > From: paul swed <[email protected]> > Date: Tue, August 18, 2020 12:19 pm > To: Discussion of precise time and frequency measurement > <[email protected]> > > Ray I would tend to agree but I actually am unclear on the context. > Did you actually build a d-psk-r? > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
