Hi, I picked up a custom Wenzel OCXO 2nd hand (image attached). The label indicates 100 MHz, but the J2 port actually produces 10 MHz at +5 dBm, which surprised me. Does that surprise anyone else? I realize that it's hard to know what you're going to get with a custom unit, but I would have expected the signal to match the labelled frequency. This made me worry that the voltage label might also be wrong, but the current draw seems pretty normal (400 mA at startup, down to less than 150 at temp). One thing that's worth noting is that I'm not getting any output from J1, and it could be an input for all I know (e.g., for EFC). In case anyone is wondering, I measured the phase noise and it's nothing to write home about. 1 Hz: -107 dBc 10 Hz: -120 dBc 100 Hz: -152 dBc 1 kHz: -159 dBc (which is the floor) Thanks, Matt

I have a Wenzel 501-19459E 100 MHz OCXO which is erroneously marked as 10 MHz... 73, John K9WT On 3/26/2025 9:46 PM, Matt Huszagh via time-nuts wrote: > Hi, > > I picked up a custom Wenzel OCXO 2nd hand (image attached). The label > indicates 100 MHz, but the J2 port actually produces 10 MHz at +5 dBm, > which surprised me. Does that surprise anyone else? I realize that it's > hard to know what you're going to get with a custom unit, but I would have > expected the signal to match the labelled frequency. This made me worry > that the voltage label might also be wrong, but the current draw seems > pretty normal (400 mA at startup, down to less than 150 at temp). > > One thing that's worth noting is that I'm not getting any output from J1, > and it could be an input for all I know (e.g., for EFC). > > In case anyone is wondering, I measured the phase noise and it's nothing to > write home about. > > 1 Hz: -107 dBc > 10 Hz: -120 dBc > 100 Hz: -152 dBc > 1 kHz: -159 dBc (which is the floor) > > Thanks, > Matt > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

  is it actually an OCXO? I've got modules from Wenzel that look like that which are "clean up loops" or "multipliers" for various frequencies. Yes, there's an ocxo inside, but the idea is you feed in 10 MHz and you get 100 MHz out, or 10 MHz in and greatly filtered 10 MHz out. On Wed, 26 Mar 2025 18:46:58 -0700, Matt Huszagh via time-nuts <time-nuts@lists.febo.com> wrote: Hi, I picked up a custom Wenzel OCXO 2nd hand (image attached). The label indicates 100 MHz, but the J2 port actually produces 10 MHz at +5 dBm, which surprised me. Does that surprise anyone else? I realize that it's hard to know what you're going to get with a custom unit, but I would have expected the signal to match the labelled frequency. This made me worry that the voltage label might also be wrong, but the current draw seems pretty normal (400 mA at startup, down to less than 150 at temp). One thing that's worth noting is that I'm not getting any output from J1, and it could be an input for all I know (e.g., for EFC). In case anyone is wondering, I measured the phase noise and it's nothing to write home about. 1 Hz: -107 dBc 10 Hz: -120 dBc 100 Hz: -152 dBc 1 kHz: -159 dBc (which is the floor) Thanks, Matt _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com

Hi You might pop it open (it looks like somebody already has done that once) and see what’s inside. There have been cases of folks selling OCXO’s that have been “helped out” by re-doing the internals. Who knows what you might find in there …. Could be a $4 Chinese OCXO. Bob > On Mar 26, 2025, at 9:46 PM, Matt Huszagh via time-nuts <time-nuts@lists.febo.com> wrote: > > Hi, > > I picked up a custom Wenzel OCXO 2nd hand (image attached). The label > indicates 100 MHz, but the J2 port actually produces 10 MHz at +5 dBm, > which surprised me. Does that surprise anyone else? I realize that it's > hard to know what you're going to get with a custom unit, but I would have > expected the signal to match the labelled frequency. This made me worry > that the voltage label might also be wrong, but the current draw seems > pretty normal (400 mA at startup, down to less than 150 at temp). > > One thing that's worth noting is that I'm not getting any output from J1, > and it could be an input for all I know (e.g., for EFC). > > In case anyone is wondering, I measured the phase noise and it's nothing to > write home about. > > 1 Hz: -107 dBc > 10 Hz: -120 dBc > 100 Hz: -152 dBc > 1 kHz: -159 dBc (which is the floor) > > Thanks, > Matt > <wenzel.jpg>_______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

Thanks for the responses. To address to a few questions/thoughts: The output is a nice clean sine wave at 10 MHz. I tried opening the unit, but though I'm able to remove the screws, the lid isn't coming off. I think the lids may have been glued shut and I didn't try too hard to pry them off for fear of damaging the unit. It's true I don't know that it's an OCXO. It could be some other sort of unit as several people have suggested. Matt On Thu, Mar 27, 2025 at 5:55 PM Bob Camp via time-nuts < time-nuts@lists.febo.com> wrote: > Hi > > You might pop it open (it looks like somebody already has done that once) > and see what’s inside. > There have been cases of folks selling OCXO’s that have been “helped out” > by re-doing the internals. > Who knows what you might find in there …. Could be a $4 Chinese OCXO. > > Bob > > > On Mar 26, 2025, at 9:46 PM, Matt Huszagh via time-nuts < > time-nuts@lists.febo.com> wrote: > > > > Hi, > > > > I picked up a custom Wenzel OCXO 2nd hand (image attached). The label > > indicates 100 MHz, but the J2 port actually produces 10 MHz at +5 dBm, > > which surprised me. Does that surprise anyone else? I realize that it's > > hard to know what you're going to get with a custom unit, but I would > have > > expected the signal to match the labelled frequency. This made me worry > > that the voltage label might also be wrong, but the current draw seems > > pretty normal (400 mA at startup, down to less than 150 at temp). > > > > One thing that's worth noting is that I'm not getting any output from J1, > > and it could be an input for all I know (e.g., for EFC). > > > > In case anyone is wondering, I measured the phase noise and it's nothing > to > > write home about. > > > > 1 Hz: -107 dBc > > 10 Hz: -120 dBc > > 100 Hz: -152 dBc > > 1 kHz: -159 dBc (which is the floor) > > > > Thanks, > > Matt > > <wenzel.jpg>_______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe send an email to time-nuts-leave@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

Matt, Try a hot air gun to heat the screws. If there is Loctite or other crud, this might help loosen it. Bob -----Original Message----- From: Matt Huszagh via time-nuts <time-nuts@lists.febo.com> Sent: Friday, March 28, 2025 6:12 PM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Cc: Matt Huszagh <huszaghmatt@gmail.com> Subject: [time-nuts] Re: Custom Wenzel OCXO - frequency differs from label Importance: High Thanks for the responses. To address to a few questions/thoughts: The output is a nice clean sine wave at 10 MHz. I tried opening the unit, but though I'm able to remove the screws, the lid isn't coming off. I think the lids may have been glued shut and I didn't try too hard to pry them off for fear of damaging the unit. It's true I don't know that it's an OCXO. It could be some other sort of unit as several people have suggested. Matt On Thu, Mar 27, 2025 at 5:55 PM Bob Camp via time-nuts < time-nuts@lists.febo.com> wrote: > Hi > > You might pop it open (it looks like somebody already has done that > once) and see what’s inside. > There have been cases of folks selling OCXO’s that have been “helped out” > by re-doing the internals. > Who knows what you might find in there …. Could be a $4 Chinese OCXO. > > Bob > > > On Mar 26, 2025, at 9:46 PM, Matt Huszagh via time-nuts < > time-nuts@lists.febo.com> wrote: > > > > Hi, > > > > I picked up a custom Wenzel OCXO 2nd hand (image attached). The > > label indicates 100 MHz, but the J2 port actually produces 10 MHz at > > +5 dBm, which surprised me. Does that surprise anyone else? I > > realize that it's hard to know what you're going to get with a > > custom unit, but I would > have > > expected the signal to match the labelled frequency. This made me > > worry that the voltage label might also be wrong, but the current > > draw seems pretty normal (400 mA at startup, down to less than 150 at temp). > > > > One thing that's worth noting is that I'm not getting any output > > from J1, and it could be an input for all I know (e.g., for EFC). > > > > In case anyone is wondering, I measured the phase noise and it's > > nothing > to > > write home about. > > > > 1 Hz: -107 dBc > > 10 Hz: -120 dBc > > 100 Hz: -152 dBc > > 1 kHz: -159 dBc (which is the floor) > > > > Thanks, > > Matt > > <wenzel.jpg>_______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe > > send an email to time-nuts-leave@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send > an email to time-nuts-leave@lists.febo.com _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com

Hi, probably some screws are hidden under the labels Il Mar 15 Apr 2025, 02:06 rbenward--- via time-nuts < time-nuts@lists.febo.com> ha scritto: > Matt, > Try a hot air gun to heat the screws. If there is Loctite or other crud, > this might help loosen it. > > Bob > > -----Original Message----- > From: Matt Huszagh via time-nuts <time-nuts@lists.febo.com> > Sent: Friday, March 28, 2025 6:12 PM > To: Discussion of precise time and frequency measurement < > time-nuts@lists.febo.com> > Cc: Matt Huszagh <huszaghmatt@gmail.com> > Subject: [time-nuts] Re: Custom Wenzel OCXO - frequency differs from label > Importance: High > > Thanks for the responses. To address to a few questions/thoughts: > > The output is a nice clean sine wave at 10 MHz. > > I tried opening the unit, but though I'm able to remove the screws, the > lid isn't coming off. I think the lids may have been glued shut and I > didn't try too hard to pry them off for fear of damaging the unit. > > It's true I don't know that it's an OCXO. It could be some other sort of > unit as several people have suggested. > > Matt > > On Thu, Mar 27, 2025 at 5:55 PM Bob Camp via time-nuts < > time-nuts@lists.febo.com> wrote: > > > Hi > > > > You might pop it open (it looks like somebody already has done that > > once) and see what’s inside. > > There have been cases of folks selling OCXO’s that have been “helped out” > > by re-doing the internals. > > Who knows what you might find in there …. Could be a $4 Chinese OCXO. > > > > Bob > > > > > On Mar 26, 2025, at 9:46 PM, Matt Huszagh via time-nuts < > > time-nuts@lists.febo.com> wrote: > > > > > > Hi, > > > > > > I picked up a custom Wenzel OCXO 2nd hand (image attached). The > > > label indicates 100 MHz, but the J2 port actually produces 10 MHz at > > > +5 dBm, which surprised me. Does that surprise anyone else? I > > > realize that it's hard to know what you're going to get with a > > > custom unit, but I would > > have > > > expected the signal to match the labelled frequency. This made me > > > worry that the voltage label might also be wrong, but the current > > > draw seems pretty normal (400 mA at startup, down to less than 150 at > temp). > > > > > > One thing that's worth noting is that I'm not getting any output > > > from J1, and it could be an input for all I know (e.g., for EFC). > > > > > > In case anyone is wondering, I measured the phase noise and it's > > > nothing > > to > > > write home about. > > > > > > 1 Hz: -107 dBc > > > 10 Hz: -120 dBc > > > 100 Hz: -152 dBc > > > 1 kHz: -159 dBc (which is the floor) > > > > > > Thanks, > > > Matt > > > <wenzel.jpg>_______________________________________________ > > > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe > > > send an email to time-nuts-leave@lists.febo.com > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send > > an email to time-nuts-leave@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an > email to time-nuts-leave@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com