Re: RFI from uBitx TX after AGC and other mods installed
Alan,
How did you mount yours audio gating board? Where did you ground it? And are we talking about the K5BCQ kit on yours, too? Since it is not distorted I would almost bet that Q3 isn't turning off. Do you have an oscilloscope? -Don
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On 06/24/2018 12:22 PM, Jerry Gaffke via Groups.Io wrote: The Nano is tough to remove, if it comes to that.
I'd try a little rotary saw or grinder using my Dremel tool for all but
the pins hiding
behind the LCD connector, then heat up those few pins on the Nano board
to pull it free.
And then extract all the pins one-by-one from the Raduino.
And take care to wash all the metal bits from the Raduino.
If anybody has a better method, perhaps they could speak up. It seems the easiest method I've heard anyone use I refer to as the RCA method. It's what the techs at the RCA service centers used when they had to replace modules on the TacTec hand helds. Cut the part out, in this case the nano, then remove the pins one at a time. Vince - K8ZW. -- Michigan VHF Corp.
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Re: Keypad for Raduino...?
Mark? N1VQW
I built a similar SNA, but control it via USB/tty link from a Raspberry-Pi.?
The keypad idea of using a single ADC input to decode keystrokes seems
intriguing to me.? This morning I set up the code so it uses a range of voltage
values for each key, and added a time delay for debounce.? using a voltage
range window seems to give me latitude enough for using standard value
resistors in the R-matrix.? Initially I set up the code to just show the value as
each key was pressed, then rewrote it to use those values as targets.?
I divided the difference between voltage values for each key by 2 and used
that to generate the tests for each key.? Code is not efficient yet as it is just a
bunch conditionals but once it is working I can go back and make it pretty.?
Next question is how much will RF affect the keystroke voltage readings?
This activity is generating some interesting thoughts about possibilities for a
new Raduino design...with OLED display, Keypad, Rotary Encoder, RTC,
Si5351a, and more.
Arv? K7HKL
_._
On Sun, Jun 24, 2018 at 11:34 AM Mark Pilant < mark@...> wrote: Hi Arv.
I used a similar keyboard for a Scalar Network Analyzer I built.? (Before I
found out about the PHSNA :-)? It turned out to work very well.? I did run
into a few issues worth mentioning.
Make sure you have some form of switch debouncing (software or hardware) as
part of the design.? I had both in my design.? ?Also, make sure you take into
account the resistor tolerances when determining the analog value for any
given key.? (Part of my SNA design was a set of calibration tasks, one of
which was the keypad.)
I'm building a uBitx with a TFT, and may include a soft keypad to augment the
encoder.? (If I can find the time... too many projects :-)
73
- Mark? N1VQW
BTW, feel free to look at the SNA code:
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Re: I need a V3 or V4 uBitx board.
Hi Joel,
can you tell me the number designations on the relays that you keep in supply. I may have to make a swap out on my uBitX board. Thanks
Guy N7BIR?
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Re: RFI from uBitx TX after AGC and other mods installed
Don: I have a similar problem only I have not installed the RF gain control. On SSB phone transmit my voice comes out of the speaker loud and clear. I find it strange the audio amp / speaker are not muted when transmitting.
73 ,
Alan
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New uBitx V3 QRP Transceiver For Sale $120 Shipped
New unopened V3 uBitx in sealed DHL bag for sale, $125 shipped to lower 48. Includes K5BCQ AGC and TX/RX click fix kits.This unit was received in mid April and will have the socketed TDA2822 audio amp chip. This extra radio was purchased in anticipation for a club project that never materialized.
73,
Alan N4AYE
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Allison you wrote earlier that, if Q90 was changed to a BFR106, R81 (1kO) needs to be changed to somewhing between 2K-2,7kO. Is this correct?
Also, if C81 was changed to 470pF, do C261 and C262 also have to be removed? I think you wrote earlier, that these two capacitors could stay.
Also you did not wrote to also change R83 to 2,2O as Farhan does.
I just did these mods (changed Q90, R81, C81 and R83 - but left in C261 and C262) and though there is more power on the upper bands, I have only about 0,5 Watts on 80 and 40 Mhz. ( 5 W between 14 and 20 Mhz and 2 Watt on 10m).
What did I do wrong, did i miss something obvious?
I measured the voltage at R82 - according to messsage #43844 there should be 2,98V - I have about 1,5V (same frequency, 7150 Mhz). Was changing R81 wrong?
Sascha
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Re: I need a V3 or V4 uBitx board.
Michael,
Thanks, I¡¯ll give it a try as it is particularly bad on the SB. When I use a LM386 I usually build VK3YE¡¯s version which has some good gain but tends to be more quiet. Steve pretty much used the application note version.
Joel
N6ALT
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Re: I need a V3 or V4 uBitx board.
Joel :
Try putting a .01 uF cap in series with a 1.8K Ohm resistor between pins 1 & 5 of the LM386 on your "Slop Bucket".
That should get rid of most of the high frequency hiss on the LM386 without impacting SSB reception.
This is a N6KR (Wayne Burdick) trick; a little used feature of the LM386 called BASS Boost.
The values I specified are those that are used in Norcal 40a.
I made the same mod to my BITX40 and it works great on both SSB and CW.
Cheers
Michael VE3WMB?
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Re: I need a V3 or V4 uBitx board.
Well, Steve ain't a gonna offer it unless there's sufficient interest.
Perhaps the Incas were onto something:
? ??
Jerry
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On Sun, Jun 24, 2018 at 11:03 am, Jack Purdum wrote:
Keep me posted if he does offer it. (I need to join another group like I need a hole in my head.)
?
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Re: I need a V3 or V4 uBitx board.
Hi Joel:
Keep me posted if he does offer it. (I need to join another group like I need a hole in my head.)
Jack, W8TEE
On Sunday, June 24, 2018, 1:56:56 PM EDT, Joel Caulkins <caulktel@...> wrote:
Hi Jack,
Steve only kitted 50 SB's, (they are all gone), however he asked the group last week if we all thought he should order another batch only 40 meter version, I voted yes. We'll see? what happens as a bunch wanted the 20 meter versions also. Maybe he will give us the option for the band of choice.
Joel
N6ALT
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Re: I need a V3 or V4 uBitx board.
Hi Jack,
Steve only kitted 50 SB's, (they are all gone), however he asked the group last week if we all thought he should order another batch only 40 meter version, I voted yes. We'll see? what happens as a bunch wanted the 20 meter versions also. Maybe he will give us the option for the band of choice.
Joel
N6ALT
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Re: I need a V3 or V4 uBitx board.
I think groups.io is your best bet.
Steve has a poll going now, asking if there is interest in a new run of boards.
If you want one you should join the group and respond to that.
I may jump in there as well.
If and when he does decide to create more kits, he will post a message to the group
with instructions on how to order.? Not sure how that happens now, but his CW rigs
sold out fast and you had to respond within a few hours.
Steve did maintain a website in the past:??
but that has not been updated in years.
He's more interested in building radios than being a webmaster.
Jerry
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On Sun, Jun 24, 2018 at 10:45 am, Jack Purdum wrote:
The the groups.io the only place to get info and perhaps place an order??
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Jack, W8TEE
?
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. . .
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On Sunday, June 24, 2018, 1:23:24 PM EDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
?
?
Here's Steve's group on groups.io, Slop Bucket lives here: /g/kd1jvdesigns/messages?expanded=1And his older yahoo group is still alive and kicking, adding a bit of confusion: Jerry
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Re: RFI from uBitx TX after AGC and other mods installed
Rowland,
Check to see if the ground at the center of your new receive RF point is good when the board is unplugged. If it is, then unplug the AGC board and jumper the two outer pins of that RF tap. It sounds like it might not be grounded well. Of course it could be many more things but that is a start. Try to disconnect or bypass one thing at a time to isolate the cause. Since you are hearing what sounds like SSB then I doubt that the problem is improper gating of the audio. Unless you are using an amplified microphone and you are just hearing peaks that are over-powering it. In which case, unplug the PA power and see if it went away. Are you transmitting into a dummy load or into a radiating antenna? The more information, the better. Please keep us posted. 73, Don
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Re: Keypad for Raduino...?
Hi Jack. I don't think I'd use an analog approach to it.... The "electronic code lock" keypad approach works great if you have lots of I/O pins available. But where I was using an UNO, I was quickly running out of I/O pins. So by using the analog approach, I only needed one I/O pin (as well as +5VDC and ground). As I see it, the trade off is mostly in the additional code needed for the analog approach. Although as I've been doing software engineering for way too long (O/S, real time, embedded, etc.) it wasn't a big deal for me. 73 - Mark N1VQW
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Re: I need a V3 or V4 uBitx board.
The the groups.io the only place to get info and perhaps place an order??
Jack, W8TEE
On Sunday, June 24, 2018, 1:23:24 PM EDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Here's Steve's group on groups.io, Slop Bucket lives here: /g/kd1jvdesigns/messages?expanded=1And his older yahoo group is still alive and kicking, adding a bit of confusion: Jerry
On Sun, Jun 24, 2018 at 10:17 am, Jack Purdum wrote:
Do you have a URL where we can find out more about it?
?
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Re: Keypad for Raduino...?
I don't think I'd use an analog approach to it. I'd use something like: ()
You can find code at:
Jack, W8TEE
On Sunday, June 24, 2018, 1:34:36 PM EDT, Mark Pilant <mark@...> wrote:
Hi Arv.
I used a similar keyboard for a Scalar Network Analyzer I built.? (Before I
found out about the PHSNA :-)? It turned out to work very well.? I did run
into a few issues worth mentioning.
Make sure you have some form of switch debouncing (software or hardware) as
part of the design.? I had both in my design.? Also, make sure you take into
account the resistor tolerances when determining the analog value for any
given key.? (Part of my SNA design was a set of calibration tasks, one of
which was the keypad.)
I'm building a uBitx with a TFT, and may include a soft keypad to augment the
encoder.? (If I can find the time... too many projects :-)
73
- Mark? N1VQW
BTW, feel free to look at the SNA code:
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Re: Keypad for Raduino...?
Hi Arv.
I used a similar keyboard for a Scalar Network Analyzer I built. (Before I
found out about the PHSNA :-) It turned out to work very well. I did run
into a few issues worth mentioning.
Make sure you have some form of switch debouncing (software or hardware) as
part of the design. I had both in my design. Also, make sure you take into
account the resistor tolerances when determining the analog value for any
given key. (Part of my SNA design was a set of calibration tasks, one of
which was the keypad.)
I'm building a uBitx with a TFT, and may include a soft keypad to augment the
encoder. (If I can find the time... too many projects :-)
73
- Mark N1VQW
BTW, feel free to look at the SNA code:
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Re: I need a V3 or V4 uBitx board.
Steve always puts a lot of effort in getting the details right.
His stuff always seems to operate cleanly with a comfortable user interface.
I've heard good things about the Slop Bucket.
An unfortunate name, unless you are old enough to catch the reference.
Jerry
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On Sun, Jun 24, 2018 at 10:12 am, Joel Caulkins wrote:
A couple of months ago I built a Steve Weber 'Slop Bucket' 20 meter Transceiver that is SSB/CW. It uses a 74HC4053, a triple DPDT analog switch driving some transistors for T/R switching. It is sweet, no clicking at all, just nice and quiet. That radio is a pleasure to use except for the hissy LM386. I guess I can't have it all my way.
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Don, ND6T
Joel Caulkins/N6ALT