In my radio filtered 48 kHz i/q stream (pairs of 28 bit samples) provided from
fpga (122.88 MHz on input) converted to 32bit floats processed by Weaver method
and can be routed trough 24 or 16 bit usb audio to wsjt. If wsjt not truncate
24 bit to 16 before processing, I can switch off AGC for these modes.
Ep4ce22e22 and allwinner t113-s3 is a heart of radio.
-
Sent from Mail.ru app for Android Monday, 24 April 2023, 01:14AM +03:00 from
Virginia Greene via wsjt-devel wsjt-devel@lists.sourceforge.net :
>I am amongst the most recent exiles. I mentioned that a current DXpedition
>may be using one of WSJT-X variants - variant not named - running MSHV, so it
>would probably be better to call that station using Normal mode instead of
>Hound mode.
>
>Boom!
>
>Anyway, the current state of the practical art in audio ADCs is an ESS part.
>It has about 20 bits of real resolution. (I have an ADC product using that
>part and it does do that). So, if you used a part like that in your
>conversion from the analog audio out of the radio into the digital domain,
>that’d be an improvement over 16 bits. Assuming the data processing will do
>24 bits, to pick a common number.
>
>But, that assumes a lot. Most radios don’t use A-D or D-A converters in their
>internal processing that are much beyond 16 bits. In a lot of radios, you
>have the detected audio converted into digital with 16 bit converters,
>processed in the DSP, and then converted back into analog audio with 16 bit
>converters.
>
>That’s hardly ideal.
>
>It’d be much nicer if we had access to the digital stream coming out of the
>DSP system before it was converted to analog. Ideally, the sample rate would
>be 48 KHz, because that’s what WSJT-X uses. I think that’d go a long way to
>improving receive performance in crowded bands. Plus, improve the transmit
>signals, too - less chance for RF problems and other goblins.
>
>73,
>
>Clarke K1JX
>
> On Apr 23, 2023, at 3:39 PM, Jim Brown via wsjt-devel <
> wsjt-devel@lists.sourceforge.net> wrote:
>
> On 4/23/2023 11:20 AM, Daniel Uppström via wsjt-devel wrote:
>> Isn't that obvious why he wants more than 16 bits? With a receiver using
>> more than that it could be possible to eliminate AGC all together and just
>> feed something with 100 dB of dynamics into WSJT.
>
> If I'm not mistaken, what the original poster is requesting was implemented
> in the latest full release of JTDX. But since even the slightest mention of
> software other than WSJT-X results in getting bounced from the WSJT-X
> reflector, we never hear about stuff like this, nor about whether it works,
> or provides useful benefit under real world conditions. I am one of those who
> got bounced.
>
> 73, Jim K9YC
>
>
>
>
>
>
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