On Sun, Nov 12, 2017 at 6:38 PM, John Miles <john@miles.io> wrote: > > Most of the 100 and 200 MHz bricks I've seen work with either 5 or 10 MHz > . I don't know if I've seen any 80 MHz units that do. All of the ones > I've bought on eBay have been from the customer-proprietary 500- series > with unusual input frequencies. > > I swept the input from 1 to 100 MHz. They lock at 38.4 MHz in. Yes they are 4-5 kHz off when free running. Locked they are right on frequency. They don't spec the phase noise when locked. I hope it is decent. The phase noise when unlocked is pretty good. I can only measure the phase noise indirectly by driving my Perseus clock with this and comparing phase noise measurements when using the internal clock. I may wind up using the internal clock when measuring phase noise and this when measuring Allan Deviation. Thanks for the suggestions. Mark

On Sun, Nov 12, 2017 at 7:02 PM, Mark Goldberg <marklgoldberg@gmail.com> wrote: > > On Sun, Nov 12, 2017 at 6:38 PM, John Miles <john@miles.io> wrote: > >> >> Most of the 100 and 200 MHz bricks I've seen work with either 5 or 10 MHz >> . I don't know if I've seen any 80 MHz units that do. All of the ones >> I've bought on eBay have been from the customer-proprietary 500- series >> with unusual input frequencies. >> >> > I swept the input from 1 to 100 MHz. They lock at 38.4 MHz in. Yes they > are 4-5 kHz off when free running. Locked they are right on frequency. > > Mark > > I have one more question. Does anyone know if when unlocked it is possible to apply a tuning voltage to the Phase Lock Voltage monitor pin? What good is it to have an OCXO that needs to lock to a external frequency and is 4 kHz off when unlocked? When locked, it comes up on frequency from first power on, so why would an oven be needed at all? If interested, take a look at my qrz.com page for links as to why I am doing this. I have fallen down the rabbit hole of more accurate frequency! Thanks, Mark W7MLG

Hi If the device pulls > 50 ppm at 80 MHz, it’s a wide range VCXO with a heater on it :) That is way more than you can pull a proper (low ADEV) OCXO. Bob > On Nov 13, 2017, at 5:04 AM, Mark Goldberg <marklgoldberg@gmail.com> wrote: > > On Sun, Nov 12, 2017 at 7:02 PM, Mark Goldberg <marklgoldberg@gmail.com> > wrote: > >> >> On Sun, Nov 12, 2017 at 6:38 PM, John Miles <john@miles.io> wrote: >> >>> >>> Most of the 100 and 200 MHz bricks I've seen work with either 5 or 10 MHz >>> . I don't know if I've seen any 80 MHz units that do. All of the ones >>> I've bought on eBay have been from the customer-proprietary 500- series >>> with unusual input frequencies. >>> >>> >> I swept the input from 1 to 100 MHz. They lock at 38.4 MHz in. Yes they >> are 4-5 kHz off when free running. Locked they are right on frequency. >> >> Mark >> >> > I have one more question. Does anyone know if when unlocked it is possible > to apply a tuning voltage to the Phase Lock Voltage monitor pin? What good > is it to have an OCXO that needs to lock to a external frequency and is 4 > kHz off when unlocked? When locked, it comes up on frequency from first > power on, so why would an oven be needed at all? > > If interested, take a look at my qrz.com page for links as to why I am > doing this. I have fallen down the rabbit hole of more accurate frequency! > > Thanks, > > Mark > W7MLG > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

With help from an number of people who responded, I have gotten the Wenzel oscillators to work and provide a frequency locked external clock to a Perseus SDR radio. I had to add an external clock input to the Perseus and describe it at: https://sites.google.com/site/perseusmods/ Mark W7MLG