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I had occasion to snip out out my Nano recently, wasn't as easy as I expected.
See second paragraph of post? ?/g/BITX20/message/50027

A minor edit to that post:
<? Then remove what's left on the black plastic from that header?
>? Then remove what's left of the black plastic from that header?

And while you're at it, you might consider socketing the Nano,
placing it on the opposite side of the the Raduino as described in that post.
I haven't noticed any downsides for doing this.

I used flux and solderwick to get as much of the solder out of there as I could,
then heated each pad with a soldering iron and blew the hole clean.
I just used my breath, an air compressor and shop vice would aid the process.?
Or a solder-sucking workstation.
A fairly easy board to do this on as traces are thick and hard to damage, no internal ground planes.

Jerry

On Wed, May 23, 2018 at 06:30 am, Jack Purdum wrote:

I think most will tell you to snip the legs of the Nano, remove it, and carefully unsolder each pin from the board, exercising care not to overheat the board and lift the pads.

?

Jack, W8TEE

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. . .

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On Wednesday, May 23, 2018, 9:20:52 AM EDT, <Kd4epg@...> wrote:

?

?

Need device on the best way to unsolder the nano board.
All help gratefully received.
--
72 and God bless
KD4EPG

Are you using stereo headphones? If you have a mono plug in the jack your shorting the audio to ground. You need to use a TRS plug in the jack supplied with the UBITX.

Skip Davis, NC9O?

On May 22, 2018, at 19:32, Daniel Conklin <danconklin2@...> wrote:

Evan, the WX labeled audio chips can blow out if the voltage going to them is beyond their tolerance? If you had the volume pot wires switched, then you may have blown out the chip as soon as you put power to the rig. I soldered a 6 volt regulator in the amp's supply line before I put power to it and it's been purring along nicely for almost two months. When they blow, most people are putting in a socket so they can replace the chip easier and there are a few good options discussed here on the board. So, that's the recommendation.
73, Dan? W2DLC?

Hi

thanks for the reply ... the software change is probably beyond me, the Raduino software is preinstalled.
Is there a way I can alter the cuicuit hardware and install a switch to change modes??

Jeff
G6EXF

Has anyone measured the bandwidth of the uBITX filter ???

I have tried it two ways. one with a SA/TG at the 12 mhz filter, and another by feeding in a audio tone from 200 hz to 2800 hz into the mic input from a function generator and using a wattmeter..? Both ways seem to give me a 3 to 6 db bandwidth of about 1600 hz.??

The receive audio seems ok to me, but several hams I talk to almost every day say the audio is not very good, like it is restricted.? I tried moving the BFO up and down about 100 hz at a time to get the best and they tune for the best signal from me incase the frequency is not exact.??

I did change to a Baofeng hand mic and the audio was somewhat better.? I am waiting on some parts to come in to repair a Shure desk mic to see how it sounds.? I am using a similar mic on my Icom 746pro.? I tried feeding my Drake L4B amp and getting around 150 watts out so the signal level is up the about the same as the Icom.? The audio did not seem to change when running the amp or not except it was stronger as it should be.

de ku4pt

Probably obvious, but don't forget a button battery for the RTC and add code to set it when you're tethered to the PC, using its system clock to get the current date and time. There's plenty of code online for formatting the data to an LCD display.

Jack, W8TEE

On Wednesday, May 23, 2018, 9:13:51 AM EDT, Sam Tedesco <stedesco619@...> wrote:

Ordered nano and clock board. Gonna start with nano then the 5351 ic. Anything else I should consider?

Thx

On Tue, May 22, 2018, 9:10 PM Sam Tedesco <stedesco619@...> wrote:

Ubitx on 1.061. That's what i figured. Best plan of attack?

On Tue, May 22, 2018, 9:03 PM Ashhar Farhan <farhanbox@...> wrote:

In tightenting up the encoder, you probably shorted some digital line to the ground. Was this on the bitx40 firmware or the ubitx?

- f

On Wed, May 23, 2018 at 9:30 AM, Sam Tedesco <stedesco619@...> wrote:

Was tightening up tuning pot and rig went desd. Restarted and display only shows firmware version. Won't give frequency. Tried firmware reinstall but same. Nano looks to be communicating properly with pc. Did I lose clock ic?

Thanks

I won't say it is the best, but what worked for me two times. Due to my fault while modifying the ubitx I had to replace the nano board.

I used one of the hot air rework stations that can be bought off ebay for about $ 60 . It has a hand held wand that blows hot air out of about a 1/4 inch hole. You keep moving the wand from pin to pin? every second or less. That melts the solder and the whole board can be pulled out at once.? Then I used a solder sucker to clean out each hole that had solder left in it.? Just keep the heat down so as not to lift the traces off the board.? It does take some practice as how to do this.? Look on you tube for many examples of using it with the SMD.

This is the one I used.? There are many sources for them on ebay.? Some from the US and some from China at many? different prices.

You get a hot air gun and a soldering pencil that has some fine tips to replace the nano.? While I would not recommend this for heavy duty work, it holds up well enough for just a hobby.? If it quits, you are not out much money and can always get another.

On Wed, May 23, 2018 at 9:20 AM, <Kd4epg@...> wrote:

Need device on the best way to unsolder the nano board.
All help gratefully received.
--
72 and God bless
KD4EPG

Need device on the best way to unsolder the nano board.
All help gratefully received.
--
72 and God bless
KD4EPG