on my bench..the mosfets are replaced and upto now its TX per specs..But I was itching to measure voltage but didnt dare to..usually these radios are calibrated by measuring current draw at the DC..anybody would happen to know voltages on the fets?
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M0nka derived SDR-928 finals voltage
- Thread starter codecxbox
- Start date
Well just by noodling around in the attached pdf you can assume a few things.
One pin is of course at or near supply voltage.
The bias that will produce xx`milliamperes will of course vary .
And one leg is at or nearly so, at ground.
Hint look at the the test and adjustment around pg 54 and 81
The reason you're not getting a full description is I'm away from my notes, distracted, busy, would rather teach you to fish in any case, or I'm full of shit
Actually Chris embarked on a monumental project and in most ways managed to pull it off. I do recommend that you perform the bias in TX only modification controlled by the ptt.
I also recommend that you get into the menu and turn FM down
If you have a burning desire for a QRP radio then this won't be of any use to you.
https://www.nxp.com/docs/en/quick-reference-guide/MRF101ANEKITQRC.pdf
Of course you'll need a 48-50V supply and an additional band switched LPF on the back end.
While we're polishing a turd ...
https://www.ebay.com/itm/392873830688?hash=item5b791ae920:g:jswAAOSwJdRfDt-M
See what happens when the mind wanders?
One pin is of course at or near supply voltage.
The bias that will produce xx`milliamperes will of course vary .
And one leg is at or nearly so, at ground.
Hint look at the the test and adjustment around pg 54 and 81
The reason you're not getting a full description is I'm away from my notes, distracted, busy, would rather teach you to fish in any case, or I'm full of shit
Actually Chris embarked on a monumental project and in most ways managed to pull it off. I do recommend that you perform the bias in TX only modification controlled by the ptt.
I also recommend that you get into the menu and turn FM down
If you have a burning desire for a QRP radio then this won't be of any use to you.
https://www.nxp.com/docs/en/quick-reference-guide/MRF101ANEKITQRC.pdf
Of course you'll need a 48-50V supply and an additional band switched LPF on the back end.
While we're polishing a turd ...
https://www.ebay.com/itm/392873830688?hash=item5b791ae920:g:jswAAOSwJdRfDt-M
See what happens when the mind wanders?
http://www.m0nka.co.uk/wp-content/uploads/2014/02/pa.jpg
Found this
https://groups.io/g/BITX20/topic/rd16hhf1_in_the_ubitx/10164213?p=Created,,,20,2,60,0
With all that Chris has put in firmware I'd be surprised if there isn't some setting for band and mode that can be stuck in memory. I know this isn't terribly scientific or very complete but for now it's all I've got. I'll look at the firmware in the raw and see if there isn't something in there tonight .
Found this
https://groups.io/g/BITX20/topic/rd16hhf1_in_the_ubitx/10164213?p=Created,,,20,2,60,0
With all that Chris has put in firmware I'd be surprised if there isn't some setting for band and mode that can be stuck in memory. I know this isn't terribly scientific or very complete but for now it's all I've got. I'll look at the firmware in the raw and see if there isn't something in there tonight .