Re: Purchase of uBitx on hold until?


Mike Woods
 

Iz

Spurs news item:  

http://ubitx.net/2018/09/15/details-of-the-anti-spurs-mod-added-45mhz-filter/

Just 3 parts and you will have that one licked.   However, it may just be an expensive way of introducing -6dB of gain!

Mike

On 10/10/18 7:56 PM, iz oos wrote:

Mike, what are the three parts to resolve spurs? I might have missed something.


Il 10/ott/2018 08:38, "Mike Woods" <mhwoods@...> ha scritto:
Eliott

The latest version of the uBITx is the v4, which doesn't have an audio chip at all (it has discrete transistors). 

The v4 board MAY have audio issues ... a small proportion of owners have experienced audio distortion.  There is a known fix for this issue and the fix is documented on ubitx.net.  The audio also has a bit lower output than the v3 board.

You discuss the IMD issue, but this doesn't appear to affect most users in practice.   It may result in some splatter if you are over-driving the audio, but really can't be considered a major impediment to a purchaser. 

There are several other issues (see http://ubitx.net/%C2%B5bitx-strengths-and-weaknesses/ for a summary of pros and cons).

If you don't want to modify the board to fix issues that really matter (harmonics - the most substantial mod that is required), spurs (requires 3 parts), and to add an AGC (multiple parts) then I suggest you don't bother buying the kit.   You may have to wait a while to see a further upgrade from HF Signals though (if ever)! If you don't mind spending a bit of time having fun making these changes, then go for it!  Lots of us out there are having fun.

73

Mike ZL1AXG ubitx.net
 

On 9/10/18 6:26 AM, Eliot Ricciardelli via Groups.Io wrote:
I am specifically referring to the current rev of the uBitx. Specifically - the audio chip issue and the IMD issue. You stated all of yours are in spec and didn't mention any component issues so I assume you have none. That is helpful, thank you.


--
Mike Woods
mhwoods@...


--
Mike Woods
mhwoods@...

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