Date   
THANK YOU K5BCQ

Mharpen@...
 

THANK YOU KEES K5BCQ for your wonderful service to the uBITX community.

Mike N6CMY

Re: uBitx Encoder information needed.

Mike aka KC2WVB <rb5363@...>
 

I ordered this as a replacement. Visually it is identical. Works well with...too.


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PEC11R-4020F-S0012
PEC11R-4020F-S0012-ND
ENCODER ROTARY
 
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13301.68000(USD) 8.40
 
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On Thu, Jun 7, 2018, 12:11 AM Dennis Yancey <bigbluedry@...> wrote:
I have 2 items I need info on.

first, does anyone have the specs for the stock encoder for the uBitx?

second, have any of you had to make software changes to get a KY-040 encoder to work properly?

Thanks for your help.

Re: Power supply fuses

Gary Anderson
 

Surprised someone has not mentioned using a P-channel power MOSFET for reverse polarity protection this low current application.
(I think someone has on an older thread that this is re-hashing)
You can find them with pretty low Rds these days.  ~ 0.06 Ohms.
That rivals the contact resistance of a relay, plus no power consumed by energizing coils.
(the power loss trade off is power consumed by the relay coils verses the difference between relay contact resistance and Rds)
We are talking < 500mA here. 

I quickly found an app note from TI.
http://www.ti.com/lit/an/slva139/slva139.pdf

Regards,
Gary
AG5TX

Re: Different Encoder

Allen Merrell
 

Vince
How many ppr did the one you used have? I have a piece of 2 inch aluminum bar stock that I was going to turn down for the knob and possibly for the flywheel if it is needed.
--
Allen  Merrell

Re: Power supply fuses

Jerry Gaffke
 

Be careful, how that PFET thing works is tricky.
Several "how I done its" are out on the web with the PFET in the schematic drawn backwards.
Here's some old threads on reverse polarity protection, everyone has an opinion, some have several.
These point to posts specific to the PFET, but there's plenty more in the threads.
    https://groups.io/g/BITX20/message/35632
    https://groups.io/g/BITX20/message/35434




On Thu, Jun 7, 2018 at 04:17 pm, Gary Anderson wrote:
Surprised someone has not mentioned using a P-channel power MOSFET for reverse polarity protection this low current application.
(I think someone has on an older thread that this is re-hashing)
You can find them with pretty low Rds these days.  ~ 0.06 Ohms.
That rivals the contact resistance of a relay, plus no power consumed by energizing coils.
(the power loss trade off is power consumed by the relay coils verses the difference between relay contact resistance and Rds)
We are talking < 500mA here. 

I quickly found an app note from TI.
http://www.ti.com/lit/an/slva139/slva139.pdf

Re: Power supply fuses

Richard E Neese
 

on the 3 pin power plug on the ubitx the middle pin is the pa and the pin to the outside edge is the board power

Re: RF power chain mods and improvements..

Steve Black
 

Today kids probably can't even buy razor blades :-((  Steve kb1chu


On 06/07/2018 02:16 PM, Jerry Gaffke via Groups.Io wrote:
Yup, almost as oldie as me.
From      http://semiconductormuseum.com/Museum_Index.htm
"Since its initial product launch by Motorola at the 1962 IRE Convention, the 2N2222 has become the most widely used and universally recognized transistor of all time. Billions of units have been manufactured over the past 45 years and there is continuing high volume annual production."

So when it was introduced, I was maybe just starting to think about  building a crystal radio with razor blades and toilet paper tubes. 

Jerry

On Thu, Jun 7, 2018 at 10:48 am, ajparent1/KB1GMX wrote:
Yes, 2n2222A are an oldie.

Re: Different Encoder

Vince Vielhaber
 

Mine's also a 400. 2" should work fine. The knob I made is close to an inch thick. The only reason I had to go with 2.5" was to cover up the window for the channel selector (case is an old CB base station) otherwise I would've gone with 2". I had 2" on hand, I had to buy the 2.5", 3" was too big and too much waste to turn down to 2.5".

Vince.

On 06/07/2018 07:29 PM, Allen Merrell via Groups.Io wrote:
Vince
How many ppr did the one you used have? I have a piece of 2 inch
aluminum bar stock that I was going to turn down for the knob and
possibly for the flywheel if it is needed.
--
Allen Merrell

Re: Power supply fuses

Lee
 

From power jack to power switch.  From power switch through a 5 amp rectifier to 2 fuses, .5a and 3a.. From fuses to the board.  Reverse polarity protection and no blown fuses. The approximately .7 voltage drop of the 5 amp rectifier will not be noticed in your receive or your output to others.
--
Lee - N9LO  "I Void Warranties"

 

Re: LM386 Hiss Suppression on the BITX40 #bitx40

Dexter N Muir
 

There's another possibility, found early on, at low volume levels: too-low resistance from pot. wiper to Earth. Anything from 1k to 10k wiper-to-IC cures it. If you've replaced the (blown?) audio IC with an LM386 and found this hiss, it's a simple cure.

73
Dex, ZL2DEX

CAT Control

Dennis
 

I have updated my uBitx to 4.3 as I would like to use CAT to interface with wsjt-x. I have been unable to find any information on how to set this up. I would appreciate hearing from someone who is using CAT with wsjt-x. I'm sure it's a simple procedure to set up, but I just can't find any instructions. Currently I'm using a usb sound card and a FTDI cable for PTT.

 

73, Dennis

W7DRW

Re: Different Encoder

Allen Merrell
 

I'm  going to give the 2 inch a try turn I down a little to smooth it up then put a light knurl on it. Was the 400 ppr you used an optical or capacitive encoder. The atm103-v is capacitive  and has a dip switch where you can program it for ppm steps from 48 to over 2000. I was thinking of starting at 48 and going up to get to what works best or that is my intention.

--
Allen  Merrell

Re: CW transmit bandwidth #ubitxcw #ubitx

Gary Schwartz
 

The issue is not with the keyed waveform but an undulating bandwidth change.  Using the internal keyer hold the dot paddle (much easier to see than with dashes).  The bandwidth starts out properly narrow, but after a second or so it quickly spreads to 1KHz+, then back to normal.  If you continue to hold the paddle this pattern constantly repeats.  When you send words the same thing happens, but it is more difficult to discern.

Gary


Virus-free. www.avast.com

Re: K5BCQ kits in BITX40 #bitx40

John
 

I know it might be demanding ;) but it would have been nice if the shipment date was mentioned.
Checked earlier this week and saw mine were send, bit so far nothing in the mailbox yet.
I know I live at the end of the world so close to the Mexican border. So things could take some time.

Anyone has a clue how long the shipment takes approximately?

John
KG5WJQ 

Re: RF power chain mods and improvements..

ajparent1/KB1GMX
 

Before you hang a 50w Amp I'd consider a band pass filter in line before the
amp to keep the spurs from being amped up and above the max allowable.  

RX is not terrible but I'e found even at 5W If I can hear them on a decent antenna
I can work them.  10 15 more DB of gain before the mixer would be nice but it s a bit
of effort to add with switching and likely only needed on 10M.    If I need 50W I just
use the Triton 540 or the Eagle for the full 100W.  Its rare I do that.

>>replacement of Q 10 also include change of C11 to 470pF and R13 to 8.3 ohm to boost 30 MHz?<<
No don't as that will impact the impedance match just the transistor. The input filter and the mixer pretty
much sets the NF and small changes in gain for the IF isn't going to move that much if any.  Gain before
it makes a big difference if the amp is quiet (say under 2.5DB).

I'd start with a beam (wire yagi, tribander or whatever) then see what you hear and can talk to.  
Its not like you can't mod later.

Allison

Re: RF power chain mods and improvements..

ajparent1/KB1GMX
 

There's enough examples and docs to learn  LTspice well.  
Its a great tool but as said garbage in garbage out.

But the tool can do a good job with a little effort.

Pushing bits is often easier then melting solder, and cheaper.
A software oops doesn't kill a 50$ transistor.

Allison

Re: K5BCQ kits in BITX40 #bitx40

Doug W
 

On Thu, Jun 7, 2018 at 06:54 pm, John wrote:
Anyone has a clue how long the shipment takes approximately?
https://informeddelivery.usps.com/
 
--
www.bitxmap.com

Re: CAT Control

Ashhar Farhan
 

1. Attach USB cable between ubitx and the computer. Attach two audio cables for mic and speaker between the radio and the comp.
2. Select FT817 as the rig on. Wsjtx. There is a test button on the settings panel to check if it works.
3. The wsjtx offers a choice of wsjtx frequencies. When you select one on wsjtx, the radio will show the changed frequency. 
4. Adjust the mic level on the computer until the signal meter on the wsjtx stops showing overload. Now, your screen will start displaying the signals. 
5. When transmitting, adjust the speaker volume on the computer to output slightly less than full output of the signal. You are done. 
- f

On Fri, 8 Jun 2018, 07:09 Dennis, <dennis@...> wrote:

I have updated my uBitx to 4.3 as I would like to use CAT to interface with wsjt-x. I have been unable to find any information on how to set this up. I would appreciate hearing from someone who is using CAT with wsjt-x. I'm sure it's a simple procedure to set up, but I just can't find any instructions. Currently I'm using a usb sound card and a FTDI cable for PTT.

 

73, Dennis

W7DRW

Re: CAT Control

Tom, wb6b
 

HI,

I'm running wsjt-x with CAT control of my uBitx on a Raspberry Pi. I simply plugged into the USB port on the Nano from the Pi. 

In my case the serial port was /dev/ttyUSB0 and I set the baud rate to 38,400. I set the radio to a Yaesu FT-817. Set the PPT Method to CAT. And mode to USB.

I wired the tip and sleeve of the USB Audio adaptor headphone out to the tip and sleeve of the uBitx microphone jack. Wired the tip and sleeve of the USB Audio adaptor microphone in to the gnd and high pins of the uBitx volume control.

The audio level into the wsjt-x is almost prefect, but I might add a couple of resistors to lower it a bit. 

The transmit level adjustment on the wsjt-x control panel, in my case, works best a about -12db.

I adjusted the transmit level by observing when the transmit power did not increases with increased "power" adjustment on the control panel slider. Then I backed off the power some. I also looked at the spectrum with my SDR and noticed when more spurs started to showed up, and backed off the power from there. The SDR and power measuring method both came up with about the same setting.

If you don't have a power meter, luminous resistors (light bulbs) work great for the purpose. I used a couple of 28v, 0.07a models wired in series. I connected those as a dummy load to test with, before connecting to my antenna. 

Tom, wb6b

Re: Building homebrew ubitx: Need pre-v3 schematic PDF. Also, source for 45M15 (45 MHz IF) filter?

Ashhar Farhan
 

It is just that shipping takes 10 dollars from india for a two dollar device. Someone in the USA cam undertake thr shipping. I can send a bunch  to someone from here.
- f

On Thu, 7 Jun 2018, 17:50 David Feldman via Groups.Io, <wb0gaz=yahoo.com@groups.io> wrote:
49.152 MHz crystals can be obtained in fundamental mode (mostly in SMD package; 5x7mm is not too difficult to work with, but smaller packages certainly are), however, check datasheets carefully and confirm with manufacturer if in doubt, as many also are offered in 3rd overtone or don't specify. Above 49.152 MHz, fundamental mode crystal seem to be rare.

That said, I believe the project should consider making the 45 MHz filter normally used in the project available for sale to homebrewers as a component or spare part (perhaps in quantity increments of 1, 10, 25, or something like that); this would greatly help those that want to duplicate or otherwise follow the commercial design and help support volume purchases by the project from OEM in China, and would help homebrewers focus on individually interesting parts of the design without having to resort to making individual design changes in that part of the circuit.

Thank you,

Dave