Some more observations on my GPS receiver/Prog Rock based frequency standard. I reported before that when I beat the Prog Rock output against the Russian standard time/frequency station RWM on 9996kHz

#progrock #synth

In my formula below, you can often reduce the error by a judicious choice of the output-stage divider value. Choose one that makes the calculated PLL denominator be as close to an integer as possible,

#si5351a #synth #programming

In the ProgRoc the synthesizer is supplied 3.3vdc from the internal regulator as well as the 5vdc pull ups. So whether the synthesizer module has it's own 5vdc regulator is of no concern. In the vfo s

#synth

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

Hi Halden SiLabs engineers confirmed somewhere on their forum that although the datasheet says the reference crystal should be 25 MHz OR 27 MHz, in fact anywhere in the range 25-27 MHz os what they re

#synth

Hans, This is a very low-priority request, but it came to mind recently as I was playing with different TCXOs for the Si5351A Synthesizer Board. What is the possibility - on you next run of boards - o

#progrock #synth

Mikael : I suspected that those resistors were acting as pullups and that explained why there were no instructions to remove them. Thanks for confirming that. Cheers Michael VE3WMB P.S. I am enjoying

#si5351a #synth

Typo: Instead of "492, ...518, and ...497", I meant "492, ...497, and ...518". Oops. -HF

#u3s #synth

Hans, Had a crystal oscillator issue a few years ago that cause a lot of head scratching. We had been producing said module for several years with no problems, when suddenly we had a rash of dead modu

#synth

Am a masochistic PIC programmer, calculating the Si5351 parameters in raw assembler. Yeah - painful, but I enjoy doing weird math. Sticking with Hans' approach where Silicon Labs AN619 app-note "a+b/c

#firmware #synth

Thanks Hans for clearing up the module's behavior when 'out of circuit.' As I alluded to in the other thread I mistakenly created, the module is currently working and my U3S has been running overnight

#u3s #synth

Al, The "Subject" line is the topic. Add to it, or change it produces a new topic. (Unless there is a way to add something without changing the topic?) 73 Alan G4ZFQ

#u3s #synth

I wanted to free up my IC7000 for "real" work so I purchased a few kits / modules from QRP Labs hoping to build a dedicated NDB / Navtex (and/or DGPS) receiver. The result is a GPS disciplined VFO dri

#polyphase #synth #qlg #rcvr #vfo

Thank you Hans! That is what I thought, just wanted to confirm that it was probably static and not mis-configuration... Oh well... I guess I zapped it... will have to order a new one since all my othe

#synth

Hi Bob When using ProgRock for the RX module you do not need to isolate the Clk0 output or provide any buffering. For some uses of the Si5351A, you may need to provide buffering/isolation. It all depe

#synth