Re: ubitx troubleshooting help - low power after irf510 replacement
Stay away from their 1/8" phone plugs. I had the tip of one fall off inside a jack. Problem was the jack was on the back of my Kenwood TS430 and I had to pull the back panel to get the jack out to get that piece out. After looking closer at the other ones I have, they're all loose - even the new ones in the drawer.
Vince - K8ZW.
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On 08/18/2018 10:17 AM, ohwenzelph via Groups.Io wrote:
It would be nice to know what is and is not good from Tayda as they have
low prices and low cost shipping.guress sometimes you git what you pay
for...
--
Michigan VHF Corp.
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Re: QRP SWR meter recommendation?
#ubitx
Here are some code snippets from a project I did. It calculates SWR from the voltages read from analog pins A6 and A7. It does a number of other things, so here are the basic pieces of code for SWR extracted out into small snippets. This first code segments captures selected analog pin voltages and applies an exponential smoothing filter to them.
for (int pin = 0; pin < 8; pin++) {
if (_analogActive[pin]) {
float scaledReading = analogScalingFactor * (float)analogRead(pin);
_analogValue[pin] +=
(scaledReading - _analogValue[pin]) * _analogFilterValue[pin];
}
}
This next slice of code captures the max voltage and applies a slow decay to the max value.
// Capture the peak analog values with a slow decay time.
// The decay time is a starting point. May want to adjust it to taste.
float decayValue = 0.001;
for (int pin = 0; pin < 8; pin++) {
if (_analogActive[pin]) {
float analogValue = _analogValue[pin];
_analogValueMax[pin] = max(_analogValueMax[pin], analogValue);
_analogValueMax[pin] += (analogValue - _analogValueMax[pin]) * decayValue;
} else {
_analogValueMax[pin] = 0.0;
}
}
And here the SWR is calculated from the Max values.
// "SWR"
float vf = _analogValueMax[6];
float vr = _analogValueMax[7];
float vd = (vf - vr);
vd = max(vd, 0.002); // Limit max SWR reading before divide by zero
// Calculate SWR from directional coupler voltages.
result = String((vf + vr) / vd);
You can see the full code here: Tom, wb6b
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Nextion 3.5 with CEC 1.097
Hello everyone and thank you for the work. I will want to know if someone has made the firmware for Nextion 3.5 with CEC 1.097. Thank you Michel
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Re: QRP SWR meter recommendation?
#ubitx
Correct, no meter provided.
A DVM is sufficient.
Or could go into analog pin A7 (with an analog switch to select forward/reverse) of the Nano.?
Perhaps both A6 and A7, use D0,D1 for the keyer if you want CW.
Let the Nano take care of the math.
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On Mon, Aug 20, 2018 at 09:06 PM, Mike KK7ER wrote:
Allison, the instructions are pretty terse.? Looks like the meter/meters does/do not come with it.? How does it work?? Use a DMM to measure forward and reverse voltages and do the math in my head?? Thanks!
73 Mike KK7ER
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Re: QRP SWR meter recommendation?
#ubitx
Allison, the instructions are pretty terse.? Looks like the meter/meters does/do not come with it.? How does it work?? Use a DMM to measure forward and reverse voltages and do the math in my head?? Thanks!
73 Mike KK7ER
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Re: QRP SWR meter recommendation?
#ubitx
Bill, I guess you are right.? I ought to be able to do some experiments before we leave to get a sense for how the MFJ performs at low power.? If I can understand what readings correspond to 2:1, I can keep it below 2:1.? And we can order one of the kits and take our time building it.? Thanks!
73 Mike KK7ER
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Re: uBitx diagnostic document from Facebook group
#ubitx
this will save a lot of people a lot of time.
--
72 and God bless
KD4EPG
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Re: uBitx diagnostic document from Facebook group
#ubitx
I agree, John. I just found this. I think it ought to be on the website, readily available to all. I wish I had had it weeks ago..
--
72 and God bless
KD4EPG
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Re: Nextion 3.2 for CEC 1.097
#ubitx
I have modified the CEC Nextion screen for my 3.2" 3.2 Enhanced HMI 3.2 Basic HMI 3.2 Enhanced TFT 3.2 Basic TFT  
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Re: Need a driver for the Raduino
I'd? like to thank Jack and Tom for their reply as once I loaded the CH340 driver, I was able to upload 1.28.
Jim
W6yxy
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Re: uBitx low audio all of a sudden
UPDATE
I found the low receive was due to a bad NANO. I have a spare Raduino board and put it in and it worked, replaced the NANO on the other Raduino and it worked.
Problem now is? I have no XMIT power on CW or SSB. Any suggestions where to start looking?
This radio was working fabulous yesterday. I really don't understand. It is like gremlins got in it last night.. lol
--
72 and God bless
KD4EPG
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Re: 80 meter bandpass filter
On Monday, August 20, 2018, 3:11:36 PM PDT, jim via Groups.Io <ab7vf@...> wrote:
On Monday, August 20, 2018, 3:03:15 PM PDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
On Mon, Aug 20, 2018 at 02:45 PM, Jim Tibbits wrote:
Output on dummy load after filter mod?? ... almost makes it
Jim
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-- Allen/KA1KIX/Uncle/Dad/Friend
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NEW DISCUSSION GROUP SPECIFICALLY FOR HOMEBREW TEST EQUIPMENT
The new discussion group has been formed.?
?
Three persons have volunteered to be moderators (Gilles, Dennis, and Jim).? I will make them moderators
just as soon as they have subscribed to the new group.?
Concept for this group is that it will focus on Amateur Radio Test Equipment that you have designed and built.
Operation and testing with homebrew test equipment is also a suitable topic.?
The intent is to stimulate design and construction of near-lab-grade but inexpensive test equipment for use by
radio amateurs.? I am guessing that a lot of this will involve micro-controllers, but we shall see where the
discussions take us.?
Arv? K7HKL
_._
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Re: 80 meter bandpass filter
On Monday, August 20, 2018, 3:24:33 PM PDT, Bill Cromwell <wrcromwell@...> wrote:
Hi, If I recall correctly the forty meter filter also passes 30 meters, and the 20 meter filter includes 17 meters. The materials are starting to arrive for my external filters and I intend to build one for each band and not include two bands per filter. 73, Bill? KU8H Just moved it down a bit ...
Jim
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Re: Intermodulation Performance
Your results are disappointing as I'd suspected they would be.
The amplifier chain seems ot struggle to make power and the quality
of the power is poor.
What also is suspect is the two IF stage 12 and 45Mhz have excess
gain and the mixers are likely getting over driven.? How much excess
depending on how you count it overall at least 16db.? I don't believe
that helps except to make up for low gain in the transmit chain.
Allison
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uBitx low audio all of a sudden
I have a v3 uBitx that has had some issues in the past but these were all worked out, to include changing out the TDA2822 to another version of that chip. I have been working with this radio for several weeks now and it has been working fine.
Today when I went to use it, the receive audio is extremely low. I can hear it in an earbud if I turn it all the way up, but the side tone is so loud then that you can't stand it. I havent made the side tone volume fix yet. The output is at rated output on CW but I have zero output on SSB. The rig was off all day and when I turned it on, this is what I found.
Then antenna is good, everything seems to check out fine except the radio. Can someone point me in the right direction?
Thanks
72
--
72 and God bless
KD4EPG
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Re: Bitx40 Specifications?
Quick answer: Michael, you can set that frequency range anyway you want. ?It¡¯s been along time since mine was stock, but I think it easily did the 40 m band.
I quickly took information from others and created my own little sketch that allows me to do 80 m as well, made a few hardware changes for that and bought an output low pass filter. ?
Turn it on¡ª-learning starts!
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?I built my Bit40,? but was looking to find some specifications.? Is there a good list of specifications???? The HF Sigs site has some for the uBitx but missing on the Bitx40.?? For instance what should be the frequency range, bottom to top end???? I wanted
to know if it goes to the right limits on both end.? Just some verification before I do any mods.
Thanks
73, KM4OLT
Michael
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?I built my Bit40,? but was looking to find some specifications.? Is there a good list of specifications???? The HF Sigs site has some for the uBitx but missing on the Bitx40.?? For instance what should be the frequency range, bottom to top end???? I wanted to know if it goes to the right limits on both end.? Just some verification before I do any mods.
Thanks
73, KM4OLT
Michael
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Re: 80 meter bandpass filter
Hi,
If I recall correctly the forty meter filter also passes 30 meters, and the 20 meter filter includes 17 meters. The materials are starting to arrive for my external filters and I intend to build one for each band and not include two bands per filter.
73,
Bill KU8H
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On 08/20/2018 06:11 PM, jim via Groups.Io wrote:
On Monday, August 20, 2018, 3:03:15 PM PDT, Jerry Gaffke via Groups.Io
<jgaffke@...> wrote:
Yes, corner is set a high so it can be used on 60m too.
On Mon, Aug 20, 2018 at 02:45 PM, Jim Tibbits wrote:
Aha!!!! photo of "80 meter" bandpass filter on my ubitx ...L20, L21,
L22 as swept ..corner frequency is closer to 6 mhz than 4
--
bark less - wag more
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Darren VE3XLT
Michael Monteith