Electronics > Repair
CMU200 Rx level issue / failed loop test
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_Wim_:

--- Quote from: Bravo on August 26, 2022, 12:44:11 pm ---I fitted the small 836Mhz filters from Arrow,  part No B39841B4147U410. They work fine.

--- End quote ---

That good to hear. Hopefully they will keep this stock a little longer.
450bush:
Dears,

I replaced the 836MHz filter with the B39841B4147U410 and it worked well! My CMU200 now pass the Internal Loopback test!

However, I am still getting some issues with the External loopback 1-4/3-2 that fail some frequencies on 1-4 due to a higher attenuation (just a little...) and also on 3-2 showing less attenuation.

I am working on a small PCB to hold the small filters and be a drop in replacement.

Kind regards,
Pedro
DavidAzulay5000:
Hey friends
i need help
I need to replace on the RXTX board
the Filter SAW FILTER 836.5MHZ
which was destroyed
At first there was corrosion
I made a temporary solution of coating with copper foil
That temporarily solved the problem
Eventually the filter cracked
I removed the filter using my hot air station
of
hakko fr801
I am now looking for candles to purchase a replacement filter
I found it on eBay
Could this be a decent replacement?

B39841B4122U410 836MHz SAW Filter SMD

https://www.ebay.com/itm/293876605853

Greetings David
_Wim_:
It will not be easy to fit that without an adaptor board, as that is a TINY component. However, with my limited RF-experience it seems to me that this would at least perform as good as B4147 part from Arrow posted above (and implemented successfully), so worth a try.

Arrow has still almost 18.000 pieces of the B4147 in stock (for only 0.45€ a piece), so that might also be an option.
DavidAzulay5000:
I know they tiny
But I ran out of options.
It's the only one I found and what's in ARROW
Exactly the same size 3 mm x 3 mm
I have a lot of adapters
I use them for V REG
of linear technology
They are really tiny LT3042
So at most I soldered the filter on the adapter PCB

An example of adapters
This is a multimeter for resistors with values of 5 milli OHM to 10 ohm
that I designed
And built a long time ago
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