Date   
Re: uBITX V5 IS 2 kc low and birdies all around 10 MHz

Evan Hand
 

Check on this thread, as the calibration procedure changed from the v4 to v5 software.

https://groups.io/g/BITX20/topic/30236125

Note that the new process with HFSignals' firmware does go into transmit mode, and that you need a receiver and a dummy load (or else antenna) connected to the uBitx.  Then zero beat the signal against the other receiver tuned to 10 MHz.

The alternative is to use a frequency counter loosely coupled to the uBitx and adjust for 10MHz.

So what you are describing is normal operation as supplied by HFSignals

73 and enjoy!
Evan

Re: uBITX V5 IS 2 kc low and birdies all around 10 MHz

jsternmd
 

Thanks Evan… Are all of these loud birdies scattered around near main MHz boundaries expected?  Many are lounder than an S9 signal.  I have my Flex 6700 and can switch rigs and antenna with single switch.  I tune in S9 stations on my Flex and they sound much quieter than many of these birdies.  I just hooked up my v3 board using same harness, encoder, pots etc.  First it is spot-on 10.000,000 MHz and while it has some birdies nothing as many or as loud as the v5 board.  I wonder what others think when they tune around the non-ham frequencies.

 

Jerry NY2KW

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Evan Hand
Sent: Tuesday, June 25, 2019 8:32 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBITX V5 IS 2 kc low and birdies all around 10 MHz

 

Check on this thread, as the calibration procedure changed from the v4 to v5 software.

https://groups.io/g/BITX20/topic/30236125

Note that the new process with HFSignals' firmware does go into transmit mode, and that you need a receiver and a dummy load (or else antenna) connected to the uBitx.  Then zero beat the signal against the other receiver tuned to 10 MHz.

The alternative is to use a frequency counter loosely coupled to the uBitx and adjust for 10MHz.

So what you are describing is normal operation as supplied by HFSignals

73 and enjoy!
Evan

uBITX v5 Tuning Related Emmisions #ubitx-help

giant
 

I noticed that when tuning I generate interference on other bands. I was listening on my VHF/UHF handheld attached to an antenna a few feet away from my HF dipole. Both run from my attic to my basement via LMR400 about 6" apart. I will try to take down the actual frequencies at some point over the next few days and try the UHF/VHF with the attic antenna vs duck antenna.

Is this a known issue? Is there anything I should check? Could it be coming from the board/raduino instead of the antenna?

Re: Has anybody gotten KD8CEC's SWR meter to work and can share how?

Mark Hatch
 

Nothing is wrong with the SWR meter, works perfectly as advertised once I fixed a bad solder joint. :-)

Not sure if I will leave it in,  saw one report of output loss. But I will confirm for myself when I get a moment...

73
Mark

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

Mark Hatch
 

I just had this very same problem and had a ground loop. Had two inputs to the second nano (KD8CEC's SWR meter from a Stockman bridge) and had not connected the ground wire for the bridge.Not only did it stay in transmits, but at one point even rebooted!

73
Mark
AJ6CU

Re: uBITX V5 IS 2 kc low and birdies all around 10 MHz

Evan Hand
 

I have been traveling for business for the last few months, so have not really used my uBitx much.  I built 2 v4 boards because of an issue with the first board (solder splash on the BFO mixer stage), so most is with the v4.  They changed the v5 SSB filter to 11.059 MHz to reduce the birdies caused by one of the Nano crystals.  I did have some birdies until I adjusted the calibration and BFO.  I would start with the BFO using a free audio spectrum analyzer program like:
http://www.techmind.org/audio/specanaly.html

I connect a mic to the PC and run the program and tune to a frequency with only static.  I then adjust the BFO so that the signal on the SA fits between 500 to 3khz.  Seems to be the best way to set it in my experience.

After I did that the birdies seemed to reduce, though not totally go away.

I also found that the uBitx is more susceptible to power supply noise.  Try testing with a battery to see if they go away.

Again, I have not used my v5 recently, so may still have them, just not on the frequencies that I was using at the time.

73
Evan
AC9TU

Re: Has anybody gotten KD8CEC's SWR meter to work and can share how?

Don - KM4UDX
 

Mark — i’m In the same boat. I would love for the SWR and power meter to work. The power meter would really help to keep the drive level in check so I avoid the RF nasties.  

My v4 and 4.3 nextion are otherwise Devine. 

But getting a watt meter and SWR would be serious gravy. 

Problem is is I have no (nada, zip) idea how to proceed. Could I ask you for some handholding here? First steps etc?

thanks ooo much for any guidance. 

P.S. my band hopping WSPR performance is typically near the top of the WSPRnet two-way ranking. For my grid-square FM18, i’m Typically  #1.  All with my V4 uBITX and a $38 AtomicPi and a DIY 80-10 OCFD. 

Re: Has anybody gotten KD8CEC's SWR meter to work and can share how?

Evan Hand
 

First of all, I have NOT built nor installed the refferenced SWT/PWR bridge.  I am passing on the information without and installation or operation experiance, so please use at your own risk.

First of, KD8CEC has built a meter that works with the stand alone I2C linked signal analyzer also by him.  The link is here:
http://www.hamskey.com/2019/04/installing-swr-and-rf-power-sensor-in.html

With the details on the Stockton SWR Bridge here:
http://bitxhacks.blogspot.com/2017/03/nd6ts-forward-and-reverse-power-meter.html

I have collected this to eventually build for my self, though that is a while off (early next year is current estimate).

Note that that solution does require a second Nano, and probably some thermal mods to the Raduino 5vdc regulator if you do not add a second regulator for the extra nano.  My plans are to use the built in regulator, as I have added a dropping resistor and heat sink that should make it good for at least a full amp of 5vdc power.

Again, use the above at your own risk
73
Evan
AC9TU

Re: Has anybody gotten KD8CEC's SWR meter to work and can share how?

Mark Hatch
 

Hi

I would recommend buying the Bridge from Kits and Parts:  http://kitsandparts.com/bridge1.4.php
Make sure you look at their page on how to wind a toroid. Basic enough for even me.   At $12 + shipping, pretty good deal. My only problem here was that I had failed to completely strip the end off one of the toroids, and had a cold solder joint. BTW: Their instructions on tuning the bridge are not great. Basically, you can either put an amp meter (Simpson or equivalent preferred) on the fwd power, and tune R4 to max on the scale. Then reverse the dummy and ubitx connections and do it again. Alternatively, you can tune fwd for full scale and rev for zero with Dummy hooked to load and UBitx in to RF in. (Need to meters or a spdt switch for the meter).

Once I got the it calibrated, it basically just worked as Ian described. BTW. All the connections are to the *Second* Nano and not the Radino. Ian diagrams are confusing in this regards.

On Ian's web page, there was one person that "claimed" that having the meter inline robs the Ubitx of 1-2w out. But I have not independently verified it.

73
Mark
AJ6CU

Mark

Re: Has anybody gotten KD8CEC's SWR meter to work and can share how?

Mark Hatch
 

Sorry, in regards to Calibration, after reversing the load or switching to rev you have to tune R3 for fun scale (if switch dummy and ubitx) or zero (if measuring rev with dummy on rf out).

Mark

Re: Mag Loop for HOA's??

Lawrence Galea
 

Re: Mag Loop for HOA's??

Jack, W8TEE
 

Yes.

Jack, W8TEE

On Wednesday, June 26, 2019, 1:34:03 PM EDT, Lawrence Galea <9h1avlaw@...> wrote:


Re: Has anybody gotten KD8CEC's SWR meter to work and can share how?

Don - KM4UDX
 

Mark -- I see building the bridge from p&K. That looks fine. And I see how that hooks to the two RF power pins. Basically a insert on the RF out line. No problems with that, i think. haha.

Q: Ian's page makes lots of references to i2c meter. What is that? I want to use the long bar on the nextion screen. Is that the i2c meter? And how do I add an other nano? I've never done that, so it seems a total mystery.

I see his white and yellow going to a nano, but not clear on the black/ground. The diagram has the ground going to a different nano. 

Which of the two nanos in the diagram is the orignal?

Do I have to update any firmware in the second nano?  How do I install the second?

I'm on 1.1x (i think) in the uBITX, and I found a nextion file that worked for the 4.3. Do I have to mess with any of that s/w?

Sorry to be so clueless, but this is all new to me...so thank you with the help!!

Don



Variable TX Power Out

 

Any recommendations for making the transmit output power variable from the front panel? Can KC8DE show current TX power levels with any suggested modes? I have a ubitx v4.

Re: Has anybody gotten KD8CEC's SWR meter to work and can share how?

Mark Hatch
 

Don,

Happy to help. Lots of people helped me get going here too.

So all the magic like SWR and better S meter and even CW decoding results from the installation of a second Nano into your machine. The I2cMeter is actually software that you download to that second nano. If you are running 1.1 on your main nano (The "Raduino" that came with your radio), you should not have to install anything there. Thru some programming magic that I don't understand the I2Cmeter actually outputs to your screen too. It is all about the blue and yellow wires from your Nextion that you cut and patch thru to the second Nano.  I have included a photo from the inside of my machine. Ian's diagrams are really confusing. Basically if you go with the second nano, all the wires he mentions go to that nano.  BTW: The SWR blog posting is 2 of 3. The first one, 1 of 3 is a must read.

Oh and one more thing, you need to use the ubitx Data Manager application (v1.1+) to enable all this magic in your original software. Basically it allows you to set the right options. You can download it from Ian's site on the same page as the CEC software. Just follow blindly his install steps and it works!

Let me know if you have any questions.

73
Mark
AJ6CU

Re: Variable TX Power Out

Jack Brabham - KZ5A
 


I don't know how well this is going to work yet but I am building my uBITX V5 with the PA voltage supplied by a buck-boost regulator with its output voltage control remoted to the front panel along with a small DVM.

In theory this will allow adjusting the output over something like a 2 to 20 watt range.  That will allow me to run QRP or not and will also function as "Drive Level" control for a planned 100W amp.

The concerns for me abt this are how the PA bias will react to variable Vcc and of course the likely hood of some sort of RF noise from the BB regulator.   De-noising the regulator should be easy but if the bias turns out to need to track the Vcc some advanced codgertation will be required.

73 Jack KZ5A


On 6/26/2019 10:08 PM, David Posthuma wrote:
Any recommendations for making the transmit output power variable from the front panel? Can KC8DE show current TX power levels with any suggested modes? I have a ubitx v4.


Re: Has anybody gotten KD8CEC's SWR meter to work and can share how?

Don - KM4UDX
 

I've used Ian's MM to change increments, add my call sign, etc.  I saw the i2c options but left them alone...for now...

okay, so to get PWR (at least) FWD PWR to display on my current nextion screen...I do the following outline steps...(see questions along the way)

get Nano#2 [q: type/model?]
update Nano#2 with https://github.com/phdlee/dspmeterv1/releases/download/V0.80/CEC_I2C_Meter_V0.8.zip
install nano#2 and arrange for appropriate +5V power Nano#2 (I have extra 5v ready to go)
Patch nan#2 into yellow wire to nextion
wire bridge to nano#2 -- like your white and gray wires?
use uBITX MM to select options on CEC1.1 to enable i2c meter and update uBITX (q: is there a posting for the options/values I need to set in MM?)
Other steps?

Also, what is the circuit in Ian's upper left side liked to "High-Vol", and do I need that?

you mentioned the important post 1/3 ...I'm lost on trying to find the first post?

Thank you thank you thank you!

Don
km4udx

Re: Has anybody gotten KD8CEC's SWR meter to work and can share how?

Mark Hatch
 

Don,

Some answers:

1. get Nano#2 [q: type/model?]

I ordered a 3 pack from Amazon for $13:  https://www.amazon.com/gp/product/B0713XK923/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

Now I got to figure out what to do with the other 2...

2. Before I would go for the SWR, I would follow the instructions at:

http://www.hamskey.com/2018/07/standalone-signal-analyzer-i2c-type_29.html

The first of three is at:
http://www.hamskey.com/2018/07/standalone-signal-analyzer-i2c-type.html

But that is not really targeted at Nextion.

And get your Signal Meter and CW decoder working.  

The gray/white wires you see there are not for the SWR (they go into the two open spaces of the back connector). The gray/white wires connect A4 and A5 of the SECOND nano to A5(SCL) and A4(SDA) of the original ones

3. The orange wire you see is the output of the signal detector circuit (see 4.3) in above referenced URL. 

4. Vol-HIgh - I got confused about this and there are wiring mistakes in some of the assembly instructions that although things work, they prevent the signal detector and some AGC's from working....  So if you go back to the original HF Signals circuit description on their web page, there is a Vol-High (analog pin 4 yellow)  and a Vol-Mid (analog pin 5 orange). See http://www.hfsignals.com/index.php/ubitx-wire-up/ .  

It is important that Mid goes to the wiper and High and ground are connected to other ports. Mine was wired wrong and took I went back to checking the circuit path until I got it...  So the S meter detector that Ian uses, has to be wired up to the Vol High signal...  And that Vol High signal needs to be *not* on the wiper. (If you reverse Vol-high and ground, your volume control will just work in reverse.)


Sounds like you got the rest of the steps right. Give it a try! Just don't put the SWR circuit in until after you have a functioning Standalone with S meter and CW Decode.

73
Mark
AJ6CU

Re: Variable TX Power Out

Mark Hatch
 

Not sure if this is David's use, but some external Amp designs require input wattage in the 1 watt range or they burn out... I

I noticed that kit-projects says that the AGC design has a RF gain control?  See: https://shop.kit-projects.com/index.php?route=product/product&product_id=101

Let me see if I can get David to comment on whether this would do the job we need.

73
Mark
AJ6CU

Re: Variable TX Power Out

 

Mark,

 RF audio gain and TX power output are not the same. In order to adjust TX power you would have to either change the voltage to the finals or change the bias. The RF gain on the AGC is for RF audio gain only.
--
David

 N8DAH
Kit-Projects.com

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