Date   

Re: "sketchy"

Arv Evans
 

Earlier TTY-to-USB adapters used an older FTDI IC for the conversion.  That design 
is still available but most newer units use the CH340 IC which is less expensive,
Most UNIX based operating systems (Linux, OS-X, BSD, etc.) are already CH340 
capable, but Windows usually needs a CH340 specific driver installed.  

Arv K7HKL
_._


On Fri, Jun 19, 2020 at 3:19 AM <Lizooki@...> wrote:
So I am a total noob to arduino stuff. But I did want to upgrade the software to and upload KD8CEC sketch.
I watched Ashar's video,a few others and read a few how to and set off.
Using my newest computer, the shack desk top, I failed, several times. The IDE didn't work.
I decided to try xloader and hex. Nope, not today bobo.
So I tried my laptop. It's a good, powerful, fast laptop.
Guess what? Nope. Nada.
I eventually dug out my 14 yr. Dell laptop out of desperation.
Xloader didn't work.
I went to the IDE ... it immediately told me I need the ch340 ( or whatever the specific USB driver is) that neither new 'puter told me about.
10 minutes later my V6.1 is purring along with CEC hex loaded!
YAY ME! Another small victory!


Re: An update to antuino

Ted
 

Hey, just for clarity, what sort of circumstance should I expect with this upgrade, that makes it suitable for the "foolhardy"?  Certainly, the improvements listed would have a lot of appeal and I'm going to want to try this.  

Thanks.


Re: ANTUINO antenna analzer CERTAIN CLARIFICATIONS REG

Jorge Luiz Fenerich
 

             Thanks for the lesson on antennas Peter, living and learning. Congratulations.
             Jorge PY2PVT _._

Em sex., 19 de jun. de 2020 às 05:10, Peter LB0K <lb0k@...> escreveu:

Muthu - Checking antennas can be confusing.
An antenna only achieves its theoretical impedance and size when in free space, but we don't have long enough feeders for that to ever happen.
In real life we can get a close fit to the theoretical numbers when the dipole antenna is mounted at one half wavelength above ground, whatever 'ground' is. Also at one whole wavelength above ground, about 73 ohms.
One illustration is the graph of 'impedance variation at height over ground' given in the ARRL handbooks and antenna books.
In most of our real situations these sorts of spacing are very difficult to achieve, so we compromise and probably don't get them over a 1/4 wave of 10m or 5m, as in your case. Therefore the 40m section and probably the 20m sections won't achieve anything like 73ohm maybe 50ohm, or under.
These effects pull down the resonance frequency(s) but your antenna doesn't swing on 40m, nor on 20m, indicating that it is too short on both.
As G4NFR suggests make a new one say 5-10% too long, or add on short pieces to similar lengths.

As a rough starting point a 40m dipole will need about 20.5m of wire, a 20m one will need 10m.

The chosen lengths can then be adjusted by folding back the ends and taping them to the 'active portion', while you make more measurements, this way you get a good idea of how much can be easily removed before one cuts tooooo much off. Keep the lengths symmetrical.  I leave mine with a good bit folded back so that when I move the antenna it can be easily be lengthened!
One point not yet answered it that you seem to have an extra resonance in the middle, this is probably coming from one arm of the 40m dipole and an opposite arm of the 20m dipole resonating together.
But perhaps you can't get the projected length suspended above your property, don't despair, just fold the ends down or around.
If you have to cut the ends off, making it too short again, you can use an AMU (aka ATU) to achieve a match.

Now with your analyser you have an exciting time ahead seeing more of what really happens with antennas, and remember you'll see much more of the matching TO the antenna but only a little more of the matching OUT of the antenna into the æther.

Good luck!



--
  73 de Jorge PY2PVT
  Campinas SP
  GG67MD


Re: [Antuino] An update to antuino

Ashhar Farhan
 

Yes, i meant the A7.


On Fri 19 Jun, 2020, 5:07 PM Dave New, N8SBE, <n8sbe@...> wrote:
"extra pin A&"

I think you meant "extra pin A7"?

73,

-- Dave, N8SBE
-------- Original Message --------
Subject: [Antuino] An update to antuino
From: "Ashhar Farhan" <farhanbox@...>
Date: Fri, June 19, 2020 6:36 am
To: Antuino@groups.io, bitx20@groups.io

I have been using thr Antuino exclusively as my main instrument for two weeks now. In the process, I have had to rewrite the entire firmware to make it more usable.
I have uploaded the new code.  I only recommend it for the fool hardy. It is available on github.com/afarhan/antuino2.2
Among the new features is continuous scanning at very fast sweeps, continuous coverage with no gaps to 250 mhz, and much simpler user interface. I have also added a voltmeter hack onto the extra pin A&. You have to add the attached circuitry to it. 


Re: [Antuino] An update to antuino

Dave New, N8SBE
 

"extra pin A&"

I think you meant "extra pin A7"?

73,

-- Dave, N8SBE

-------- Original Message --------
Subject: [Antuino] An update to antuino
From: "Ashhar Farhan" <farhanbox@...>
Date: Fri, June 19, 2020 6:36 am
To: Antuino@groups.io, bitx20@groups.io

I have been using thr Antuino exclusively as my main instrument for two weeks now. In the process, I have had to rewrite the entire firmware to make it more usable.
I have uploaded the new code.  I only recommend it for the fool hardy. It is available on github.com/afarhan/antuino2.2
Among the new features is continuous scanning at very fast sweeps, continuous coverage with no gaps to 250 mhz, and much simpler user interface. I have also added a voltmeter hack onto the extra pin A&. You have to add the attached circuitry to it. 


Re: RFI on 2 meters from uBitx

Jay - WS4JM
 

Thanks Everyone! Some very good information and things to try.

I have already switched to the Axicom relays, I installed my ubitx in an old Cobra 148 CB case (metal).

I will try ferrites on all of the power leads and report back.

Thanks again

Jay
WS4JM


An update to antuino

Ashhar Farhan
 

I have been using thr Antuino exclusively as my main instrument for two weeks now. In the process, I have had to rewrite the entire firmware to make it more usable.
I have uploaded the new code.  I only recommend it for the fool hardy. It is available on github.com/afarhan/antuino2.2
Among the new features is continuous scanning at very fast sweeps, continuous coverage with no gaps to 250 mhz, and much simpler user interface. I have also added a voltmeter hack onto the extra pin A&. You have to add the attached circuitry to it. 


"sketchy"

@KF4ZGZ
 

So I am a total noob to arduino stuff. But I did want to upgrade the software to and upload KD8CEC sketch.
I watched Ashar's video,a few others and read a few how to and set off.
Using my newest computer, the shack desk top, I failed, several times. The IDE didn't work.
I decided to try xloader and hex. Nope, not today bobo.
So I tried my laptop. It's a good, powerful, fast laptop.
Guess what? Nope. Nada.
I eventually dug out my 14 yr. Dell laptop out of desperation.
Xloader didn't work.
I went to the IDE ... it immediately told me I need the ch340 ( or whatever the specific USB driver is) that neither new 'puter told me about.
10 minutes later my V6.1 is purring along with CEC hex loaded!
YAY ME! Another small victory!


Re: ANTUINO antenna analzer CERTAIN CLARIFICATIONS REG

Peter LB0K
 

Muthu - Checking antennas can be confusing.
An antenna only achieves its theoretical impedance and size when in free space, but we don't have long enough feeders for that to ever happen.
In real life we can get a close fit to the theoretical numbers when the dipole antenna is mounted at one half wavelength above ground, whatever 'ground' is. Also at one whole wavelength above ground, about 73 ohms.
One illustration is the graph of 'impedance variation at height over ground' given in the ARRL handbooks and antenna books.
In most of our real situations these sorts of spacing are very difficult to achieve, so we compromise and probably don't get them over a 1/4 wave of 10m or 5m, as in your case. Therefore the 40m section and probably the 20m sections won't achieve anything like 73ohm maybe 50ohm, or under.
These effects pull down the resonance frequency(s) but your antenna doesn't swing on 40m, nor on 20m, indicating that it is too short on both.
As G4NFR suggests make a new one say 5-10% too long, or add on short pieces to similar lengths.

As a rough starting point a 40m dipole will need about 20.5m of wire, a 20m one will need 10m.

The chosen lengths can then be adjusted by folding back the ends and taping them to the 'active portion', while you make more measurements, this way you get a good idea of how much can be easily removed before one cuts tooooo much off. Keep the lengths symmetrical.  I leave mine with a good bit folded back so that when I move the antenna it can be easily be lengthened!
One point not yet answered it that you seem to have an extra resonance in the middle, this is probably coming from one arm of the 40m dipole and an opposite arm of the 20m dipole resonating together.
But perhaps you can't get the projected length suspended above your property, don't despair, just fold the ends down or around.
If you have to cut the ends off, making it too short again, you can use an AMU (aka ATU) to achieve a match.

Now with your analyser you have an exciting time ahead seeing more of what really happens with antennas, and remember you'll see much more of the matching TO the antenna but only a little more of the matching OUT of the antenna into the æther.

Good luck!


Re: RFI on 2 meters from uBitx

MVS Sarma
 

Cool. Shane, concept appreciated. Congrats.

Sarma vu3zmv

On Fri, 19 Jun 2020, 5:58 am Blobby Harvey, <blobbyharvey4@...> wrote:
Hi Jay
I had the same problem RFI around 2m. I put the the bitx in a metal case and ferrite ringed the power lead. 

I had no more problems. 

73’s. Shane ZL2SH

On Fri, 19 Jun 2020 at 12:11 AM, Raj vu2zap <rajendrakumargg@...> wrote:
You could try replacing relays KT1/2/3 with Axicom RF relays, that should reduce this.
Check earlier posts for details.

Raj

At 18/06/2020, you wrote:
>I have been experiencing RFI on the 2 meter band when my V3 is tuned to the upper end of 75 meters. I had my uBitx tuned to the TN Phone net at 3.980 MHz and my 2 meter rig tuned to my local repeater at 146.91 MHz. The 2 meter rig showed full scale receive, with no audio. I checked with my hand held and it was full scale at least 50 feet from the uBitx. The RFI exists when the uBitx is in RX as well as TX. Seems like a 3rd harmonic of a mixing product; (45 MHz+3.98 MHz) X 3 = 146.94 MHz
>
>Any ideas where or how to add shielding or if a component needs to be replaced?
>
>Thanks,
>Jay
>WS4JM





Re: UBITX. FT8 heat sink requirements #ft8 #ubitx

Gordon Gibby
 

yes for low duty cycle modes it should work


On Jun 18, 2020, at 21:10, Dean Souleles <dsouleles@...> wrote:

Hey Don - I assume your transmit duty cycle on WSPR is still10-15% which means you transmit two minutes out of 20.

You should be able to run pretty much forever at that rate.

I've run  WSPR 24 hours multiple times with stock heat sinks,

Dean
KK4DAS


Re: UBITX. FT8 heat sink requirements #ft8 #ubitx

Dean Souleles
 

Hey Don - I assume your transmit duty cycle on WSPR is still10-15% which means you transmit two minutes out of 20.

You should be able to run pretty much forever at that rate.

I've run  WSPR 24 hours multiple times with stock heat sinks,

Dean
KK4DAS


Re: RFI on 2 meters from uBitx

Blobby Harvey
 

Hi Jay
I had the same problem RFI around 2m. I put the the bitx in a metal case and ferrite ringed the power lead. 

I had no more problems. 

73’s. Shane ZL2SH

On Fri, 19 Jun 2020 at 12:11 AM, Raj vu2zap <rajendrakumargg@...> wrote:
You could try replacing relays KT1/2/3 with Axicom RF relays, that should reduce this.
Check earlier posts for details.

Raj

At 18/06/2020, you wrote:
>I have been experiencing RFI on the 2 meter band when my V3 is tuned to the upper end of 75 meters. I had my uBitx tuned to the TN Phone net at 3.980 MHz and my 2 meter rig tuned to my local repeater at 146.91 MHz. The 2 meter rig showed full scale receive, with no audio. I checked with my hand held and it was full scale at least 50 feet from the uBitx. The RFI exists when the uBitx is in RX as well as TX. Seems like a 3rd harmonic of a mixing product; (45 MHz+3.98 MHz) X 3 = 146.94 MHz
>
>Any ideas where or how to add shielding or if a component needs to be replaced?
>
>Thanks,
>Jay
>WS4JM





Re: neton screen to ver 6 board

Evan Hand
 

rpremooak,
That is a 2.8" Enhanced screen, so you need the files that end in _E.tft.  I do not remember where I got these from, ut here is a zip file with what I believe is the correct tft file.

73
Evan
AC9TU


Re: neton screen to ver 6 board

rpremooak@...
 

I attempted to use this TFT for 2.8" screen but shows as incompatible with the screen that I have which is:

NX3224K028
Do you have a TFT that is compatible with this screen?


Re: UBITX. FT8 heat sink requirements #ft8 #ubitx

Gordon Gibby
 

I doubt it seriously. Almost all Riggs, have to be Der ated a bit for continuous duty.   


On Jun 18, 2020, at 17:16, Mick <Mgsebele@...> wrote:

Aaron,
I run FT8 all the time without any over heat problems.
--
 

73
Mick VA3EPM 


Re: UBITX. FT8 heat sink requirements #ft8 #ubitx

Mick
 

Aaron,
I run FT8 all the time without any over heat problems.
--
 

73
Mick VA3EPM 


Re: Opposite side band rejection ubitx V6

Dale Parfitt
 

Thank you Gary,

My apologies for not doing my homework. Much appreciated.

Dale W4OP

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Gary Anderson
Sent: Thursday, June 18, 2020 3:57 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Opposite side band rejection ubitx V6

 

On Thu, Jun 18, 2020 at 11:38 AM, Dale Parfitt wrote:

Hi Allison et al,

What  is the design in/out impedance of the crystal filter?

Dale,
SSB filter is 200 ohms per the circuit description
https://www.hfsignals.com/index.php/ubitx-circuit-description/
Rgds,
Gary


Re: Opposite side band rejection ubitx V6

Gary Anderson
 

On Thu, Jun 18, 2020 at 11:38 AM, Dale Parfitt wrote:

Hi Allison et al,

What  is the design in/out impedance of the crystal filter?

Dale,
SSB filter is 200 ohms per the circuit description
https://www.hfsignals.com/index.php/ubitx-circuit-description/
Rgds,
Gary


Re: UBITX. FT8 heat sink requirements #ft8 #ubitx

Aaron K5ATG
 

I'm guessing that the uBitx V6 transistors and heat sinks are good enough for the digital modes also?
--
'72
Aaron Scott
QRPARCI# 16443
GQRP# 16389
4SQRP # 1080