I played with crystal filters a while back, and found that the low profile? HC-49s crystals aren't suited for wider bandwidths (SSB), but are OK for CW filters.? I was experimenting at 4.9 MHz, at 9 MHz it will be different.? Just something to be aware of.? The full height HC-49 crystals I had checked out OK for SSB filters.

Am 20.02.2022 um 23:41 schrieb Ion Petroianu:

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Ion
VA3NOI

another source: 20 Stücke 9M 9,000MHz 9.000MHz HC-49S Quarze Oszillatoren | eBay <> from china seller185115


185115
185115 <>

181

ebay item

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Ion
VA3NOI

Mike,
Have you tried Mouser Electronics?
Cheers,
Halden VE7UTS

Does anyone have a recommended source for 9MHz crystals for a crystal ladder filter?? Plenty offered on E-bay but no way of telling how good they are.
Thanks,
Mike
K5ESS

Thanks Bill. I tried your version of the code, but it never gets beyond "Waiting for GPS" and shows the target frequency, in my case 10.0M and it does produce 10 MHz. The serial output also stops with "waiting for GPS".

I'll try to add the pin 3 LED for the frequency alarm and see if that tells me anything more

But my hardware runs fine with the original V5.1 software straight off of the F2DC website -?

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Sverre

LA3ZA
http://la3za.blogspot.com

Hi, Sverre,
I just uploaded my implementation of Erik's design, including the code. You are welcome to grab that and try it to see if there is any difference. Though you did not implement the hardware phase detector, my code is not using that so it should not make a difference. I have been playing with this since last fall, and made a couple of mostly cosmetic changes to the display routines. Schematics, pictures, and parts lists included.?
I am still having a 'hang' issue with the display stopping after some apparently random amount of time. I think it has to do with recovery from GPS loss of signal, but have not positively confirmed that.?
73,
Bill
N5BIA

Thank you Dave, I set the ssid and password, still doesn't want to connect with my? netgear ac1900 smart wifi router, model r6900 v2. Could be something I am not doing right when trying to connect, still trying though.

Got it to run by disabling CLOSE_LOOP in approx line 67-70 in ino-file:

#define CLOSE_LOOP? ? ? ? ? ? ? ?0 // 8 must be 0

Now, if I could only get the LCD to show GPS clock time, i.e. UTC time, and not just elapsed time since power was first turned on, I would be happy!

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Sverre

LA3ZA
http://la3za.blogspot.com

Bill Buoy <bill@...> added folder /Q&D GPSDO

Just to add to my previous question. I can hear the output at 10.0 MHz, so there is definitely a Lock here.


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Sverre

LA3ZA
http://la3za.blogspot.com

I'm trying to run Erik Kaashoeks code for the 10 MHz reference. The problem seems to be that the LCD is stuck while the code seems to achieve lock.

The code is from 3 Dec 2021:?

My hardware is a SI5351 with a TCXO at 25 MHz and a 16x2 LCD, and no phase detector. Judging from the serial output on the Arduino monitor, it seems to be running OK. But hardly anything shows on the LCD, only the second line which says " F2DC V.5.2"., no lock information and no clock.

Here is the output on the serial monitor for the first 5 minutes:



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Sverre

LA3ZA
http://la3za.blogspot.com

Great work!

Check you have set your SSID and password details in my_SA.h.? Lines 30/31.

Dave M0WID

Dave, I tried the reference output and it displays similar to your photo snap with 15 mhz at 30 db and with the harmonics. I am waiting for another attenuator and a couple of other parts, and should see completion soon on it. The only error I now have is it now won't connect to the wifi, most likely an error on how I have the config arranged. I again thank you for all your help.
John.

开云体育

Not yet, today I connected the tg 4432's and they all are seen and loaded. I am now working on the filters and waiting for a few parts to be delivered. I am taking it section by section and testing as I go. Thanks for the info will use it when I finish the filters.

Glad you have got it working.? Have you tried connecting the ref out to the input?? As shown the 15MHz ref signal is on? (REF 15 in the side status bar) so you should see signals at around -30dBm at 15MHz, and all the harmonics at 30, 45MHz etc.


If you touch the Ref area of the status bar you can change the ref frequency or turn it off.? Also available from the main menu/Output/Reference.

Well done.

Dave M0WID

added photo

Update, I checked everything and found a short between sdo and + 3.3 volt line, corrected and tried again, no go. I started a new rf board, this time on the same board as the control. I only have the rx-4432 and tx-4432 finished. The tg section follows next. The program booted up with the tracking rx and tx not initilised, and the screen showed normal operation. No filters are completed either, The wiring on my first rf board to the control board was the problem, I am awaiting delivery of more filters and resistors and capacitors and digital switches to finish the construction. I have placed a snapshot of the screen in photos to show the results.

Thank you Dave and Gyula, I will certainly check your suggestions out. Just got power back after 3 days outage, reason I haven't replied sooner. Am in process of building a new RF board with better traces and connections and including the tracking generator, with the switches for the filters.

Hi John,
I had exactly the same error message.
Checking with a magnifying glass did not help. The Si4432 module has a distance of 1.27mm feet. I checked the adjacent legs with an Ohm meter and found a short circuit. I soldered the module again after desoldering and then cleaning the connections. So the barely visible (I can't remember which short between legs) short caused the above error message.
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Gyula HA3HZ