Date   

Re: Raduino with a different SDR?

Jack, W8TEE
 

Probably not. The Arduino family just don't have the resource depth or clock speed to do it.

Jack, W8TEE

On Thursday, April 11, 2019, 8:50:02 PM EDT, Martin KM6TCD <peaceofandalus@...> wrote:


 
I have a different SDR that has it's own internal sound card circuit. Otherwise, it needs a computer running SDR software...
 
Could that external computer be replaced with a Raduino?


Re: New siglent on the way

Gordon Gibby <ggibby@...>
 

On Apr 11, 2019, at 19:20, twowindsbear via Groups.Io <twowindsbear@...> wrote:

How about links to the siglent and the spectrum analyzer that you mention??


Raduino with a different SDR?

Martin KM6TCD
 

 
I have a different SDR that has it's own internal sound card circuit. Otherwise, it needs a computer running SDR software...
 
Could that external computer be replaced with a Raduino?


uBITX V3 for sale

ve3wmj@...
 

I have a uBITX version 3 board for sale. It is complete, and has not been modified. It includes a Nextion 3.2" display, a 12v 5a power supply, an additional 5v regulator board that can be used to power the 3.2 inch display, and an additional 10k pot with a knob.
Everthing you see in the picture below is included. I did not complete building the kit, but did do enough to power it up and test it on receive. You will need to swap the wires on the encoder as I have it wired backwards.
I am asking $120 US plus shipping. Will ship to Canada or USA.
Email me at my call sign at hotmail.com for more info.

Mike
VE3WMJ 


Re: Ubitx with the Raspberry pi and WSJT-x #ubitx

Don - KM4UDX
 

Bo,  I'd like to leverage your good work (aka copy).  My current cheap sound card dongle is installed in my uBitx case.  I put a easydigi between the dongle and the uBitx audio input/output, and I wired a pot I series with the input to the uBitx mic so I could easily control drive level. All driven perfectly by my win laptop (fldigi, WSJTX, js8call, etc.)

while it works well, I hate having to dedicate my old laptop to the job.  Hence the RPi.  I know next to nothing 'bout  no UNIX or Pi.  But the goal is to put the Pi in the case, and use an old excess monitor/keyboard, etc.

i assume from your write up that the Pi will drive the cat control, usb sound card, run fldigi, and a browser to do QRZ call sign lookups?

is this doable, or am I signing up for a endless nightmare?

thanks so much for the help. 

Don
km4udx


Re: Microphone choices

Don - KM4UDX
 

Mike -- I burned up the included electret element, then bought 10 similars to replace it.  Put one in a pill bottle with the tiny included switch on the side.  Works grand.  My QRZ page has a pic.  If you would like a extra element, just send me the address.  Happy to mail one to you.  

Don
km4udx


Re: New siglent on the way

twowindsbear@...
 

How about links to the siglent and the spectrum analyzer that you mention??


Re: CW key sticking with Nextion LCD, still getting RF in

Joe Puma
 

I ordered the myantenna inline choke I posted. Theres a lot of good things said about so we will see. I have a 3 core 49:1 unun for efhw. before i had a 9:1 unun and a random wire. Had the same issues there. I got grounding, counterpoise, all types of stuff…nothing has really combated the issue, getting closer though. I put 3 ferrites on the cable it helped a little with the tuner chatter but still hear some RF hissing in the speaker.  Today I am redoing all the cabling in the radio with good shielded wire with foil wrapping. 


Joe
KDNFC


On Apr 11, 2019, at 6:09 PM, Jack Brabham - KZ5A <kz5a@...> wrote:

Antennas like the OCFD, EFHW , really even a plain dipole will utilize the coax shield as part of the antenna's counterpoise if they can,  resulting in  RF in the shack, excessive noise pick-up, and pattern distortion.   The EFHW requires a counterpoise of ~10% of the main element length, the others not so much.

The way to prevent this problem is a choke unun at the antenna feedpoint.   This can be as simple as several turns of coax in 8 to 12 inch loops,  or at qrp levels several turns of  RG-174 wound around something like a FT240-43 core. 

I had a Balun Designs 2KW Unun that was the center of a 160/80 trap dipole, after a few years the electrical box it was mounted in deterioated and it went to the junk box.

Recently it's "parts" have now been resurrected and it now forms the input choke unun for my 4 core 49/1 EFHW transformer, all in the same 4x4x6 junction box.

Fighting RF in the shack problems never ends until you find a way to keep it out.

73 Jack KZ5A







On 4/11/2019 1:44 PM, Joe Puma wrote:
I can try that on the short patch from tuner to meter or radio as I have LM240 there. but the line going to antenna is RG213. So I don’t have a clip ferrite that big.  




On Apr 11, 2019, at 3:40 PM, Evan Hand <elhandjr@...> wrote:

I had similar problems when connected to an off center fed dipole.  i solved my issues with clip on ferrite on the coax going to the antenna.  That may work for you.  Maybe a ferrite between the uBitx and the tuner, or an isolation balun

The issue was RF on the braid of the coax.

FWIW
73
Evan
AC9TU




Re: CW key sticking with Nextion LCD, still getting RF in

Jack Brabham - KZ5A <kz5a@...>
 

Antennas like the OCFD, EFHW , really even a plain dipole will utilize the coax shield as part of the antenna's counterpoise if they can,  resulting in  RF in the shack, excessive noise pick-up, and pattern distortion.   The EFHW requires a counterpoise of ~10% of the main element length, the others not so much.

The way to prevent this problem is a choke unun at the antenna feedpoint.   This can be as simple as several turns of coax in 8 to 12 inch loops,  or at qrp levels several turns of  RG-174 wound around something like a FT240-43 core. 

I had a Balun Designs 2KW Unun that was the center of a 160/80 trap dipole, after a few years the electrical box it was mounted in deterioated and it went to the junk box.

Recently it's "parts" have now been resurrected and it now forms the input choke unun for my 4 core 49/1 EFHW transformer, all in the same 4x4x6 junction box.

Fighting RF in the shack problems never ends until you find a way to keep it out.

73 Jack KZ5A







On 4/11/2019 1:44 PM, Joe Puma wrote:
I can try that on the short patch from tuner to meter or radio as I have LM240 there. but the line going to antenna is RG213. So I don’t have a clip ferrite that big.  




On Apr 11, 2019, at 3:40 PM, Evan Hand <elhandjr@...> wrote:

I had similar problems when connected to an off center fed dipole.  i solved my issues with clip on ferrite on the coax going to the antenna.  That may work for you.  Maybe a ferrite between the uBitx and the tuner, or an isolation balun

The issue was RF on the braid of the coax.

FWIW
73
Evan
AC9TU



Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

_Dave_ AD0B
 

I have found that c50 is a bit microphonic, Am able to tap on it with a pencil and hear the tap. You might try it to see if the audio system is working.

Have had the finals almost baking hot after having a cat sit on the desk mic for a long period of time. Didn't hurt the transistors at all.


Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

Evan Hand
 

I would replace the LM386 they are relatively cheap, only issue may be time waiting to get one through the mail.

If you have another audio amp, you could try connecting the wiper of the volume control to the amp input to see if you then get the difference between antenna connected and not connected.

Good luck!
73
Evan
AC9TU


Re: v5 12m/10m Spectrums

Curt
 

Iz

I suspect the inductor I used from coilcraft is at least as good as those in v5.  Q ~ 60 or 70 above 45 MHz.  I am contemplating a BPF based upon a T37-6 and a cap, but since we need rejection only 5 MHz above and below 45 MHz - I am doubting it would do much.  One spur seems to be 2 x 45 - LO, and the other appears to be PA leakage going back into the mixer for another conversion. 

a by-product here is when I add anything in this serious path in my v4, the CW transmit output in both 40 and 80 meters drops a bunch - well under 5 watts.  (at least one other v4 I know of does this). 

of course I thought about a switch for CW to eliminate needing to route through the mixer (that is then not a mixer) - but that's complexity.  but I wonder if something like this could improve the QSK - if we got rid of all the relays when doing CW (except the static ones for band switching). 

Curt


Re: CW key sticking with Nextion LCD, still getting RF in

Joe Puma
 

I can try that on the short patch from tuner to meter or radio as I have LM240 there. but the line going to antenna is RG213. So I don’t have a clip ferrite that big.  




On Apr 11, 2019, at 3:40 PM, Evan Hand <elhandjr@...> wrote:

I had similar problems when connected to an off center fed dipole.  i solved my issues with clip on ferrite on the coax going to the antenna.  That may work for you.  Maybe a ferrite between the uBitx and the tuner, or an isolation balun

The issue was RF on the braid of the coax.

FWIW
73
Evan
AC9TU


Re: CW key sticking with Nextion LCD, still getting RF in

Evan Hand
 

I had similar problems when connected to an off center fed dipole.  i solved my issues with clip on ferrite on the coax going to the antenna.  That may work for you.  Maybe a ferrite between the uBitx and the tuner, or an isolation balun

The issue was RF on the braid of the coax.

FWIW
73
Evan
AC9TU


Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

Jens Kaemmerer
 

Hi Evan,

Following your recommendation, I disconnected the 12V, 3A AC->DC powersupply and replaced it
with a 12V battery. The humming noise is now gone but I can still not hear any of the signals even
at VOL set to max (a relatively small VOL level used to be sufficient to hear signals). 

I then attempted the 'inject an audio signal' test and was able to hear a very weak audio signal
with VOL set to max. I can hear this audio signal on my headset without any further amplification
and can barely hear it when send through the uBitx audio amplifier. How should I interpret this 
result? Is the LM386 broken too?

-jens (KM6ZJV)


Re: CW key sticking with Nextion LCD, still getting RF in

Joe Puma
 

Hi Sam, 

I had a pvc air wound one too. 21ft of coax, but it was some real crappy coax so I took it off. I will try a better one. I was eyeing an inline choke, I was thinking of getting the my antenna one. 




On Apr 11, 2019, at 2:51 PM, Sam Tedesco <stedesco619@...> wrote:

U have a choke on the efhw? I have a very similar set up and run into similar issues without one. I use an pvc wound coax choke.  Or, try adding/removing a couple feet of radiator line? Intermittent sucks.


Re: v5 12m/10m Spectrums

iz oos
 

Curt, is your ineffective LC 45mhz filter the same you find in ver5? Have you used toroids? Which color or which inductors have you used?


Il 11/apr/2019 16:03, "Curt via Groups.Io" <wb8yyy=yahoo.com@groups.io> ha scritto:
Ron

nice work - yes I was looking for P=V^2/R .... thanks for the effort to set me straight on dBv. 

nice that your v5 appears to be in-spec.  I had tried the same LC filter at 45 MHz but it did not do anything for my v4 - so this has me wondering about the secret sauce that provides the improvement.  I hope this result holds up across the v5's.  is your v5 stock or did you make some changes for spurious? 

Curt


Re: CW key sticking with Nextion LCD, still getting RF in

Sam Tedesco
 

U have a choke on the efhw? I have a very similar set up and run into similar issues without one. I use an pvc wound coax choke.  Or, try adding/removing a couple feet of radiator line? Intermittent sucks.


Re: v5 12m/10m Spectrums

MadRadioModder
 

You must have quite the high-end Spectrum Analyzer if it can accurately measure to 0.2db or less at that level… and NIST calibrated to boot?  Ours are only good to 0.8dB…

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of ronmhauser via Groups.Io
Sent: Thursday, April 11, 2019 10:38 AM
To: BITX20@groups.io
Subject: Re: [BITX20] v5 12m/10m Spectrums

 

Your welcome Curt, I had to do the math for myself too.  I have not done any hardware modifications as yet, only non-stock thing is KD8CEC firmware.  AGC add on from N8DAH is next (working on it now).  I'm still compiling my spectrograms.  All but 80m are better than 40dB down for sure.  Most can be set to better than 43dB down, though I have an annoying 42.8dB down on 40m that just irritates me.  I'm thinking about adding a daughter board to improve these a little more just as a pursuit of perfection.  But I also realize that 40dB down from 5 watts is .0005 watts.  I don't think I will lose sleep about an FCC van tracking me down for half a milliwatt.  :)

My biggest lesson from all this testing is that the radio alignment varies across bands.  Setting mike gain and RF gain is optimized for a particular band (or else a really big compromise across multiple bands).  I read it in Allison's comments ... but now I "get" it.  There is only so much gain that you can get from a stage, and that gain varies by frequency, which depends on parts selection.  So, different alignment on different bands, different power on different bands. 

I can't overstate how much I have learned from this build.  Thanks for interesting conversation!

73
--Ron
K0EIA


Virus-free. www.avg.com

--

…_. _._


Re: CW key sticking with Nextion LCD, still getting RF in

Joe Puma
 

Hi,

So I made some progress with adding the diodes on the RX and TX blocking the discharge of the caps near by. And I was able to get the CW key to stop sticking with a .01uf on the blue line to ground on the Nextion display. But there is still one more bugger. The problem does not happen all the time but around 14mhz and 28mhz there is some RF getting in the delay portion of when you unkey the CW keyer, If I make delay 0 no problem. but with it on It shows a power and swr boost durning that delay time on the meter and I hear a hiss in speaker. My auto tuner chatters making it go out of tune for the next transmit.

Its intermittent now but it definitely seem like RF getting into that delay, if that makes sense. Since I’ve been making great use of filtering with .01uf on other areas I am thinking I can use a cap to fix this problem, but where? I did PTT, but I dont think I put a .01uf on the CW key yet

To add, I don't see the problem when I am on a dummy load, just my antenna system and it seems to act wacky if my tuner tunes it to a weird spot. RF is present. Then sometimes I get a good tune and when I unkey, CW It ends clean. I want to say that the radio is not all to blame either because on my commercial radio, same antenna on 11 meters around 29.500 if I key my radio full power and hit max watts out, the whole radio resets and clears memory, so I might have some wild RF issues, the EFHW is near by the house and over the roof.


the sage continues…

Joe
KD2NFC

On Apr 10, 2019, at 6:17 PM, Joe KD2NFC <kd2nfc@gmail.com> wrote:

At first I wrapped a barrel chock on the wires of Nextion. It helped a little. The I put a .01uf on the blue wire of Nextion and ground and that stopped the key from sticking.

Joe


Sent from my iPhone

On Apr 10, 2019, at 12:46 PM, d balfour <davesters@hotmail.com> wrote:

I didn't follow the link but You might try a torrid on the orange line and/or between the raduino and nextion.


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