Re: OT: Farhan's satellite - ExseedSat-1 - Possible launch?
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Re: Quick digital mode question
yep thats all that's needed.
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Greetings,
I have a ubitx unopened ver. 3 kit that I'am not going to build that I want to sell or perhaps trade. I also have an aluminum case for it. I would like to get $100 for all of it. You can reach me at jerry.kitterman@....
73 Jerry W9YJI
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On Sat, Dec 1, 2018 at 05:15 AM, LKNDAVE wrote:
VK4PLN
I'm not real familiar with his raduino board but looking at the schematic it appears to be just and enhanced raduino. Looks like he brings the i2c pins out to a header and a few other minor changes. Any of the Ubitx Firmware should work great as they all already use the i2c library.?? ? -- N5KBP
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Re: Quick digital mode question
Lots of people do, but also very many do not. I have been using a Pi and a ?6 usb soundcard with leads directly to my ft891 with no issues at all. All of the input levels are controlled through the software sliders for the soundcard on the pi.
Cheap and effective, but I was just concerned about the voltage on the ubitx mike. I think I have settled on a series capacitor to be on the safe side. Hope to be up and running on Monday!
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That surprises me. I always use a sort of psk interface, i. e. isolating transformer (to avoid ground loops), fixed attenuator (the signal from the sound card might be too strong for an mic input), volume potentiometer (to tailor the max output of the rig
up to half of full output, to save finals and have a cleaner output) and blocking caps.
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Re: Quick digital mode question
That surprises me. I always use a sort of psk interface, i. e. isolating transformer (to avoid ground loops), fixed attenuator (the signal from the sound card might be too strong for an mic input), volume potentiometer (to tailor the max output of the rig up to half of full output, to save finals and have a cleaner output) and blocking caps.
Il 01/dic/2018 20:30, "Daimon Tilley" < daimontilley@...> ha scritto:
Thanks Evan.
Daimon,
I have not connected anything other than a mic and amp to the uBitx, however I have a lot of experience with both Arduino's and Raspberry Pi's. Both are susceptible to high voltage on their inputs (5 volt limit for most, 3.3v for some), and can be damaged
if more is applied.? The dc available on the uBitx mic connection is over 8 vdc (limited by the cureent resistor).? I would strongly recommend you use a cap on both inputs and outputs to the uBitx (note there is already a cap on the audio out).
Just my 2 cents
Evan
AC9TU?
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Re: Quick digital mode question
Thanks.
On 1 Dec 2018, at 11:05, Gordon Gibby < ggibby@...> wrote:
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I ?use series capacitors often, especially to avoid the transformer output shorting out the DC! 1 microfarad works usually
Hi all,?
i am about to connect my Raspberry Pi via a usb souncdard to the uBitx.
in relation to the mic out from the rig to the sound card - does the dc voltage present on the tip of the plug (for the electret mike) pose a problem? I am confused as to whether or not I should add a capacitor in line to block the dc? Should I, and would that
even work?
thanks.
Daimon. G4USI.
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Re: Quick digital mode question
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Daimon,
I have not connected anything other than a mic and amp to the uBitx, however I have a lot of experience with both Arduino's and Raspberry Pi's. Both are susceptible to high voltage on their inputs (5 volt limit for most, 3.3v for some), and can be damaged
if more is applied.? The dc available on the uBitx mic connection is over 8 vdc (limited by the cureent resistor).? I would strongly recommend you use a cap on both inputs and outputs to the uBitx (note there is already a cap on the audio out).
Just my 2 cents
Evan
AC9TU?
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Re: Quick digital mode question
Thanks but there will be no transformer decoupling via signaling or similar, just straight from Pi to usb soundcard to rig.
On 1 Dec 2018, at 18:35, Gordon Gibby < ggibby@...> wrote:
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The signaling has a serious capacitor built into it
Hi Daimon
I must admit I'd never thought of the potential problem you mention. However FWIW I use a Signalink USB between Raspberry Pi and ubitx and it all works fine in every mode I've tried.
Cheers
Jeremy
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Re: Quick digital mode question
The signaling has a serious capacitor built into it
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Hi Daimon
I must admit I'd never thought of the potential problem you mention. However FWIW I use a Signalink USB between Raspberry Pi and ubitx and it all works fine in every mode I've tried.
Cheers
Jeremy
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Re: Nextion 3.5 inch display software and firmware versions
Latest Dr. Ian Lee KD8CEC's firmware? version 1.11
Raduino Source & Hex, MM EXE & HMI's for Nextion
Rich Neese KB3VGW's Custom Nextion Screens from 2.4 to 7.0 inch. TFT's and HMI's
?
-- N5KBP
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Re: Quick digital mode question
Daimon, I have not connected anything other than a mic and amp to the uBitx, however I have a lot of experience with both Arduino's and Raspberry Pi's. Both are susceptible to high voltage on their inputs (5 volt limit for most, 3.3v for some), and can be damaged if more is applied.? The dc available on the uBitx mic connection is over 8 vdc (limited by the cureent resistor).? I would strongly recommend you use a cap on both inputs and outputs to the uBitx (note there is already a cap on the audio out).
Just my 2 cents Evan AC9TU?
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Re: Quick digital mode question
Hi Daimon
I must admit I'd never thought of the potential problem you mention. However FWIW I use a Signalink USB between Raspberry Pi and ubitx and it all works fine in every mode I've tried.
Cheers
Jeremy
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Re: Found one issue was Preamp question
Discussed the cross-over issue to my
brother in law.? He was also perplexed, so did more research - and
found an answer.
Turns out, it is a "feature" of the LM358!?? The way the chip is
designed to reach low output voltage, it can happen at low level
audio levels.? The manufacturer should have a bold caveat in the
datasheet.? This is mentioned in the TI datasheet, but buried
down? on page 12.??
"For
ac applications, where the load is capacitively coupled to the
output of
the amplifier, a resistor should be used,
from the output of the amplifier to ground? increase
the class A bias current and prevent
crossover distortion.
Where the load is directly coupled, as in dc
applications, there is no crossover distortion."
Now I know...?
Woody? KZ4AK
For more on this, see:?
---------------------------------------------
On 11/28/2018 22:35, Woody wrote:
More testing... Found something else that I didn't suspect.? Sure
won't help audio quality!!!
Getting significant crossover distortion out of my LM358 audio
amp.?? The 470pf in the feedback loop was to tame the highs a
bit.? Simple circuit, but something isn't right.
Tried several different feedback resistor values to change the
gain.? No help.
Think will rebuild with a trusty 741 OPamp.? Less susceptible to
RF too :)
Woody
1 KHz tone
--
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Nextion 3.5 inch display software and firmware versions
Good afternoon all
I'm new to the group,?a friend? wants to upgrade his ubitx display to a Nextion 3.5 inch type.
As far as I know his radio has no mods but he would like to add a S meter with the opamp solution.
There's a lot of information on the site?with different software versions?so its hard to follow , could somebody suggest
a software version and link for the Nextion display?and?Arduino code that will work with a unmodified radio.?
Many Thanks in Advance
Alan
??
?
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hi all,
i am working a project that i want to use VK4PLN (VK4PP) RADUINOI2C ver. 1.0
i looked in the files section and through pages of files that are poorly described.
for now i need the raduino i2c rotary 16x2 i2c sl5351 dds. it sure would be nice to know if there is a sketch that include the above and the other options on the board. i have been to nicks website and left empty. i love that board, thanks NICK
please point me.
TNX,
DAVE N4LKN 73s
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Re: Consider the Bitx40, clean and cheap for 40m
bruce,
you may replace the bi-directional amps by 3 transistor version and see the performance difference. ?A friend has indicated that noise level comes down. Even One could try with single dual gate mosfet per each direction. Thanks to the designer of simpleceiver. regards
On Sat, Dec 1, 2018 at 6:19 PM Bruce MacKinnon KC1FSZ < bruce@...> wrote: Hi:
I'm also a fan of the BITX40/20 architecture and have had good luck on other bands.? One thing I did was to create a "mainframe" of the core of the design that starts right before the first mixer and ends right after the product detector/balanced modulator.? In my own experimentation it seems like 90% of the modification are happening in the "peripherals" around the core (different LC filters, different PAs, different bands, different audio/mic configurations, different software, different enclosures, etc.) so I am able to cover more ground without needing to re-build the inside of the inside every time.
My core uses two SI5351 ports so the BFO is tunable just like the VFO making it easy to fool with different IFs, filter widths, etc.? I also based the chain on the W7ZOI TIA amp which seems to improve performance a lot.? So there is a bit of the uBITX design incorporated here I guess.? The crystal filter is on a daughter card for easy swap.? I'm using ADE-1 mixers on both sides which are easily/cheaply obtained on E-Bay.? Adjustable gain VFO/BFO buffers (ala N6QW LBS design).? The core is 100% symmetric so it's quick to build and test.
73s,
Bruce KC1FSZ
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Re: Consider the Bitx40, clean and cheap for 40m
Hi: I'm also a fan of the BITX40/20 architecture and have had good luck on other bands.? One thing I did was to create a "mainframe" of the core of the design that starts right before the first mixer and ends right after the product detector/balanced modulator.? In my own experimentation it seems like 90% of the modification are happening in the "peripherals" around the core (different LC filters, different PAs, different bands, different audio/mic configurations, different software, different enclosures, etc.) so I am able to cover more ground without needing to re-build the inside of the inside every time. My core uses two SI5351 ports so the BFO is tunable just like the VFO making it easy to fool with different IFs, filter widths, etc.? I also based the chain on the W7ZOI TIA amp which seems to improve performance a lot.? So there is a bit of the uBITX design incorporated here I guess.? The crystal filter is on a daughter card for easy swap.? I'm using ADE-1 mixers on both sides which are easily/cheaply obtained on E-Bay.? Adjustable gain VFO/BFO buffers (ala N6QW LBS design).? The core is 100% symmetric so it's quick to build and test. 73s, Bruce KC1FSZ 
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Re: Quick digital mode question
I ?use series capacitors often, especially to avoid the transformer output shorting out the DC! 1 microfarad works usually
toggle quoted message
Show quoted text
Hi all,?
i am about to connect my Raspberry Pi via a usb souncdard to the uBitx.
in relation to the mic out from the rig to the sound card - does the dc voltage present on the tip of the plug (for the electret mike) pose a problem? I am confused as to whether or not I should add a capacitor in line to block the dc? Should I, and would that
even work?
thanks.
Daimon. G4USI.
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Re: Nextion Display: Source ???
I have bought this from ebay and working ok with my ubitx ver.3.
Regards? 73 Ricky? ( DV3RWR)
On Sat, Dec 1, 2018 at 2:59 PM Snowist < uyelik@...> wrote: I trust Worldchips store in Ali???but they have 2.4 and 2.8 inch LCDs, removed 3.5 and higher from list.
Alternatively Aihasd store is available with higher sales numbers??but I didn't buy from there yet. Make sure and ask seller to send Nextion branded, you know there is Chinese brand of this, I don't suggest that one. You can get basic version, works fine.
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