I am trying to find a BOM (list of parts) for the ICT WSPR tracker.

I read the excellent PDF by yo9ict, but a few parts, such as the resonator and the 27MHz TcXO for the Xmiter are proving hard to track down. No part number is given and there are so many to choose from.

Can anyone point me in the right direction?

Thanks,

-Dave

Hi, I have tested those tcxo:s in flight and they have been proven to be very stable.

just change? to? 26000000 in TelemFunctions.h





resonator, make sure you choose?CSTCR4M00G55Z-R0

Thanks, I take a look.

-Dave

I think I have all the parts tracked down now. I am trying to find a cheaper source for the GPS modules. DigiKey has them, but they are $21 USD apiece plus shipping. Does anybody have any cheaper suppliers?

Thanks again,

-Dave

OH I guess I should add: Is there a particular version of the GPS to use? The schematic specs, max6 and the PDF mentions Max8. Max 8 comes in a bunch of different versions.

-Dave

Any ublox will work but the footprint is made for the MAX modules, Im using the Max7 as thats avalible quite cheaply from China.



I ordered 10psc from this seller?

My flights used:

TCXO :?
UBLOX MAX-M8C
RESONATOR IS NOT CRITICAL, as long as it fits the PCB footprint

39x19 from?

or 39x22 from:

开云体育

OH I guess I should add: Is there a particular version of the GPS to use? The schematic specs, max6 and the PDF mentions Max8. Max 8 comes in a bunch of different versions.

-Dave

-- 
SQ9GOL  Peter
Greetings from Poland
website: 
'73

Here is a link to what I found on Digi-key.

No promises, but this is what I am ordering. All of the SMD's , Cells, and CPU's are coming from ebay.?

https://www.digikey.com/short/zt197z

those are some teenie tiny little parts..how do you plan to solder them?? At one time I thought about using a toaster oven, but was warned that fumes from the solder paste are toxic and possibly explosive.? hi hi.. I have 3 un assembled stella boards here waiting for parts and when I look at the size of those pads I just sigh...

Brian K9WIS

-----------------------------------------

From: "Big Dave"
To: [email protected]
Cc:
Sent: Thursday January 30 2020 8:56:35AM
Subject: Re: [HABalloon] ICT WSPR Tracker BOM?

Good light, good magnification, and no coffee!

I thought the same thing. How much weight is saved by not using something more usable like 0802?

It will be a good challenge though..

The resonator was the one recommended by Mikael at the start of the thread. I have my boards and I'll check the fit when the parts show up this next week.

Nice to see a full BOM, it would have saved me a lot of time.

That's what the "safety squint" and the Great Outdoors are for :-)

John
K5MO

I have built a some smd Steve Weber ATS radios by hand. I made a "doofus"? hihi from a piece of coat hanger wire. It has some fishing weights in the middle and a sharpened end that you use to hold the part in place. The other handy tool is a toothpick with some beeswax on the tip. Its great for holding tiny parts. You also need very fine solder and a very sharp pointed soldering tip.
I now use a converted toaster oven with a controller I built with a kit from Sparkfun (several years ago..it has a serial connector). You always have to do some touch up but it generally works well. I'd like to see that K1FM board converted to parts on one side and no 402. I'm not sure how well my oven would work on upside down boards.
Oh..and a ginormous magnifying visor
Good luck 73 Jim VE3PRO

Looks like Eduard is correct. The resonator in my BOM is too small for the footprint. Fortunately that is only $3 worth of parts...

Thanks for pointing it out.

-Dave