Posts by Remi PD0RBO

Good point Harry!

I have a Nano on hand and wil experiment with your GitHub suggestion

Thanks

Quote from i2NDT

do1ctl  DD0KP

another approach is to use a PIC to program up to 8 (or 1 or 4...) different frequencies selected by a deep switch:

https://wiki.batc.org.uk/ADF435x_PIC

i2NDT Claudio

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Thank you Claudio!

This makes my day and inspires me to implement optional up&downconversion on my board.

Quote from DD0KP

I must have a closer look in detail..will response later Remi...

I will look forward to it 👍

Progress until now, by the looks of it there’s room to spare.

Quote from DD0KP

Remi PD0RBO pd0rbo if you have a neo7 module with an eeprom you can store the settings there I think without any uC beside. This could be done with the UBLOX SW from the internet. If you need some code for your ATtiny I can write this for you. Your schematics looks ok..

Thanks

The Ublox module stores the settings only when backup battery is supplying the memory, when discharged the settings are gone.

If you think it is no trouble for you to help me out there, that would be great.

The thoughts/reservations I have are I can get +10-15dB of the FH1-g, do I need one or two for reference to the LNB? And can I set the GPS module to 100KHz and get rif of 2x 74HC390 without haring to worry about much jitter?

Hi all,

First things first, all I know is learned by myself by reading and trial and error. So if you see something obvious please do mention.

My goal is to design a simpele and low cost (>=€50,-) 25Mhz reference with bias-t and 3x 10Mhz sin out.

The valeus of the parts in the schematic need to be revised/calculated and I have to note that they are indicative only.

Question #1

As writing software is not my strong point, I’m looking for a solution to “fix” the settings in the neo-7M module. Right now I planned a Attiny45 on the PCB and hope to find someone that can help me out with the software. Writing software in the uC is no problem as I have done that numerous times. Writing software myself, well I can make a LED blink but thats it.

So if any can make suggestion?

Question #2

Can someone revise my schematic, confirm it is correct or if not make suggestions?

Any additional suggestions are welcome.

Thnx in advance

20190413-schematic.pdf

20190413-pcb.pdf

I understand, I’ve got tonnes of questions and idea’s and patience is not my best vertue, but I’ll try to persevere HI

PA3FYM , I’m enthausiasticly following René PE1CMO and you’re progress in building great stuff. But did you, or are you planning to publicise the source code for what you’ve build?

I like to experiment myselves and want to build a dual (h/v) ref for RX, but aren’t that particular keen on writing software.