Sorry, I failed to note that the circuit board assemble isn't complete at this step in the instructions, so Q5 hasn't been mounted. But your test setup is still the same as Hans used, so you should ge

#ocxo

Per Ron's suggestion, I have adjusted R21 for startup heater current at about 100 mA. It is now running WSPR on 30m .... with its case open on the bench and with a separate metered current limited pow

#ocxo

well, that explains what I have in two ocxo kits that I purchased in July 2018. they both have these extra parts. the search here quickly supplied the answer! Thanks, Hans, for all that you do. 73, Ge

#synth #ocxo #si5351a

Tim, wrote: Do not worry about the exact frequency. The target is a stable frequency around 27MHz. Once the OCXO is setup and stable then you use the GPS (or configuration menu) to set the frequency e

#ocxo

I'm of the understanding that the U3S was the major revision that switched VCO types, but that was before my time here. To be absolutely safe, remove pin 12. The Si5351a has plenty of other grounds.

#pcbversion #u3s #ocxo #building

I have been using G4FON's program to up my game.

#qcx #20m #ocxo

hello Ken, thanks, I managed to fix the external screen of the ocxo well and now it is fine. I send you a picture . good evening and good week and. now I try it in tx wspr in 6 mt.

#ocxo

Good evening everyone, I'm Giuseppe iu8eun from Calabria. I would like to ask you for help regarding the external shield as shown in the OCXO photo. I can't put it because it hits the IC1 below. I'd l

#ocxo

Even I agree 100%. And I designed the thing :-/ 73 Hans G0UPL http://qrp-labs.com

#ocxo

Hi Paul and Geoff, All understood and thanks for the clarification. I have learnt quite a bit from our exchanges today. Thank you ! 73 Brian G3ZOH

#ocxo #mods

The solution to the problem I had of drift with the OCXO was much simpler than I had thought: To my embarrassment connecting the heater to + 5 Volts made all the difference! It turned out that I had d

#ocxo #u3s

My thoughts are its scope hookup has issues and is adding in extraneous noise that the DSO is trying to sync on. Since the signal is both amplitude and phase I'd suspect outside sources getting into t

#si5351a #problem #ocxo

Hi Dear Team, I have homemade heterodyne (OCXO/Si5351A + Arduino with a control program) and I have a strange situation, frequency of output signal is cycling changes, you can see it on the video in a

#ocxo #si5351a #problem

I really like this method, and I'm going to try it with some of my 10MHz clock references! But won't it also show nulls if the Clock Under Test wanders up and down in phase/frequency but maintains an

#ocxo #vfo