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Re: sBitx V3, (PSK,RTTY,Olivia,MFSK) And More, Fldigi, Short How-To

 

These guys.... Same as HF Signals or different company all together??

Anyone had any experiences???

Dave Shaw
The Vintage Radio Repair Workshop
Full Restoration and Repair of vintage valve radios.
DAB/FM/Internet Conversions.


On Monday 19 August 2024 at 18:03:14 BST, HA3HZ <gyula@...> wrote:


On Mon, Aug 19, 2024 at 04:56 PM, dave.shaw1@... wrote:
?Anyone bought anything fron uBitz kits in India? They are not the same a HF Signals but the kits seem very similar.. Is it the same outfit or not??
Dave,

?the search engine does not find any information related to uBitz in India. Can you post a picture?
--
Gyula HA3HZ

Screenshot_20240820_163956_com.facebook.katana.jpg
Screenshot_20240820_164135_com.facebook.katana.jpg

Re: ATU recommendations

 

ZL1SGS,?
What have you been using as a case to protect the board?

Scotty WD4PYT?


On Tue, Aug 20, 2024, 4:20 AM ZL1SGS via <goresmith=[email protected]> wrote:
If it helps, I've used the N7DDC ATUs in both my ubitxv6 and sbitx v3. I just but the kits with no enclosure to build internally - something like . Not recommending this specific vendor - there are loads of them on Ali and ebay.
Re: ATU recommendations

 

If it helps, I've used the N7DDC ATUs in both my ubitxv6 and sbitx v3. I just but the kits with no enclosure to build internally - something like . Not recommending this specific vendor - there are loads of them on Ali and ebay.
Re: ubitx audio amp problem discovered

 

Andy,
?
The uBitx will filter out anything over 3kHz at the SSB crystal filter, so it is not an issue for anything over 3kHz.
?
To get a better response, increase the output capacitor to 100uF. Also, remove C62, as it favors a high-frequency response over low frequencies.
?
73
Evan
AC9TU
Re: ubitx audio amp problem discovered

 

I omitted the 47uF cap C64 in my model. Adding it reduced the gain.? I lowered Q6 RE to 270 Ohm.
?
Adding a 47 Ohm series resistor between C63 and the load increased the gain about 17 mV.? If the signal out meets the requirements of the modulator, is there a benefit to making a better match and reworking the gain?
?
Thank you for the info on C61, Raj!
?
73, Andy
?

uBITX_V6_Mic_Amp_with_Simple_Bufffer_V3.asc
uBITX_V6_Mic_Amp_with_Simple_Bufffer_V3.asc

Re: ubitx audio amp problem discovered

 

Thanks Evan!
?
? ?I noticed that the 0 dB point in the sim was at just below 1 KHz.? When I ran your model at 10 KHz, the energy sent to the modulator is 336 mV, which rises to 342 mV at 20 KHz.? (I assumed when Farhan said the modulator wanted to see about 150 mV that meant peak, and not P-P or RMS. Was that a bad guess?)
? ?
? ? I don't yet have my breadboard bits on board so can't yet see what happens in the real world.
?
? ? Maybe there's room to tweak the frequency response as well?? (Says the guy that couldn't successfully model a transistor in spice two days ago...)
?
? ? 73, Andy
?
? ?
Re: sBitx V3, (PSK,RTTY,Olivia,MFSK) And More, Fldigi, Short How-To

 

Thanks, George. fldigi works but it would be better is I could change frequencies without a 1 to 2 minute wait.
?
73, Bruce, W4BRU
Re: sBitx V3, (PSK,RTTY,Olivia,MFSK) And More, Fldigi, Short How-To

 

On Mon, Aug 19, 2024 at 04:56 PM, dave.shaw1@... wrote:
?Anyone bought anything fron uBitz kits in India? They are not the same a HF Signals but the kits seem very similar.. Is it the same outfit or not??
Dave,
?the search engine does not find any information related to uBitz in India. Can you post a picture?
--
Gyula HA3HZ
Re: sBitx V3, (PSK,RTTY,Olivia,MFSK) And More, Fldigi, Short How-To

 

Dave,
?
I don't see a uBitz company name.?
?
Is this the company you are taliking about???
?
?
If so I did order parts from them but the shipping from India to my location doubled the price.
Re: sBitx V3, (PSK,RTTY,Olivia,MFSK) And More, Fldigi, Short How-To

 

?Anyone bought anything fron uBitz kits in India? They are not the same a HF Signals but the kits seem very similar.. Is it the same outfit or not??

Dave Shaw
The Vintage Radio Repair Workshop
Full Restoration and Repair of vintage valve radios.
DAB/FM/Internet Conversions.
Re: sBitx V3, (PSK,RTTY,Olivia,MFSK) And More, Fldigi, Short How-To

 

Hi Bruce,
?
I am working on our club Winlink gateway for a next couple of days, but I will try my sBitX setup again after that to see if I get the same problems. I did not try the drop-down list - just scrolled through the frequencies with a mouse.
?
George
Re: js8call no transmit V3 64bit

Marius ZS1ML
 

开云体育

/g/BITX20/wiki/2452

?

Is the How to contribute to the Bitx Wiki. Is there a separate Wiki for the 64bit

?

73 en mooiloop,

73 and kind regards,

?

Marius Lubbe – ZS1ML

Chairman: Boland Amateur Radio Klub

We serve a wide area including the Cape Winelands and Cape Town areas, of South Africa.

Mobile phone:?+27 (0)82 785 7763

?
Re: ubitx audio amp problem discovered

 

Hi Andy,
?
Here is my LTSpice simulation of the V6 mic preamp:
?
?
Only the transistor and two resistors should be needed for the modification.? The bias for the new transistor comes from the existing transistor.
?
73
Evan
AC9TU

uBiTx Mic Preamp with efolloer.asc
uBiTx Mic Preamp with efolloer.asc

Re: ubitx audio amp problem discovered

 

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Andy,

C4 is to suppress RF from getting into mic line. Commercial rigs also include a series

inductors. Some have 300Hz LC filter at the input.

Raj

On 19/08/2024 2:26 AM, AndyH via groups.io wrote:

According to LTspice... (Famous last words?)
?
Here's one potential solution.? It adjusts RE on the Q6 amp from 1K + the 47 Ohm swamping resistor, to a 270 Ohm resistor.? C62 is deleted.? A buffer from page 2 of Skelton's "Building a Transceiver" is AC coupled.
?
The 50 mV peak input signal is converted to an output that varies between 83.5 mV at 2KHz to 152.2 mV at 20 KHz.
?
I have no idea what C4 does.? LTspice doesn't seem to care about it one way or the other.
?
I'll continue to experiment with buffers and see if I can figure out simpler options, and options that can be DC coupled.
?
73, Andy
KG5RKP/MM
Getting bounced by wakes from weekend powerboats on the West Florida Intracoastal Waterway
?
Re: js8call no transmit V3 64bit

 

Thanks Scotty.. It's not that difficult and I can walk you though it. Will send you a message on Discord.
?
?
?
-JJ
Re: js8call no transmit V3 64bit

 

JJ, I would gladly help with your wiki documentation on a limited basis if I knew how. Is there a wiki on how to use wiki? At this point, I would probably make it worse, but I am willing to learn and try. ?
73, Scotty WD4PYT?


On Sun, Aug 18, 2024, 4:50 PM JJ - W9JES via <w9jes=[email protected]> wrote:
Anyone willing to contribute to the Wiki is welcome to contact me either via email, direct message, or discord.. I am open to help with the 64bit build documentation. I'd like to have documentation on the sBitx itself as well.
?
?
-JJ
Re: ubitx audio amp problem discovered

 

Maybe this will work as well.? Both this buffer and the previous one from Skelton can be DC coupled by placing them between the Collector of Q6 and the positive side of C63.
?
I'll breadboard these when my boards and resistor assortment arrives.
?
73
?
Re: ubitx audio amp problem discovered

 

According to LTspice... (Famous last words?)
?
Here's one potential solution.? It adjusts RE on the Q6 amp from 1K + the 47 Ohm swamping resistor, to a 270 Ohm resistor.? C62 is deleted.? A buffer from page 2 of Skelton's "Building a Transceiver" is AC coupled.
?
The 50 mV peak input signal is converted to an output that varies between 83.5 mV at 2KHz to 152.2 mV at 20 KHz.
?
I have no idea what C4 does.? LTspice doesn't seem to care about it one way or the other.
?
I'll continue to experiment with buffers and see if I can figure out simpler options, and options that can be DC coupled.
?
73, Andy
KG5RKP/MM
Getting bounced by wakes from weekend powerboats on the West Florida Intracoastal Waterway
?
Re: js8call no transmit V3 64bit

 

Anyone willing to contribute to the Wiki is welcome to contact me either via email, direct message, or discord.. I am open to help with the 64bit build documentation. I'd like to have documentation on the sBitx itself as well.
?
?
-JJ
Re: sBitx V3, (PSK,RTTY,Olivia,MFSK) And More, Fldigi, Short How-To

 

George, on my sBitX V3 64bit (field day release), using the pull-down List to change frequencies (see the image) causes the system to "hang" or stop dead. No audio, the spectrum display is frozen. I can start other apps but the radio is stopped, no tuning, nothing. I timed it between 1.5 and 2.5 minutes and then it recovers and the selected frequency is set? as if nothing happened.
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