Date   
Re: Gordon Gibby Digital Interface

 

I did include a few 4.7k's with each kit for people to play with to help with changes.
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: LM324 AGC Issue

Neil Tolman
 

Thank You!
Neil
K1NBT

On Monday, October 21, 2019, 10:19:25 AM EDT, Joel Caulkins/N6ALT <caulktel@...> wrote:


Here you go.

Joel
N6ALT

Re: Testing Crystal Filters maximum dbm

ajparent1/KB1GMX <kb1gmx@...>
 

Iz,

think about that.... 
-10dbm is about .1milliwatt,  +16dbm is 40milliwatts or about 400 times greater power.

Crystal filter and crystals in singular use generally have a max power of about
1mW (0dbm) for most while some of the older slab rocks in FT243 cases could
take much more.

Why the limit, two things its mechanical vibration and the consequence is heat.
Too much heat and crystals crack or lead bonds fail.

I have swept filters and generally I use -10dbm for safety. Since the average filter is 
about 3-8db loss that is more than enough drive to see a signal on the other side.
So a source side 20db attenuator is pretty much required.  Also the source
impedance is then solidly known making it easier to add the needed transformer
or network to match the input of the filter.  You will likely have to have the same
network to match the detector side as well.

Allison

Re: LM324 AGC Issue

ajparent1/KB1GMX <kb1gmx@...>
 

One further issue is to insure the wire from the base of
Q10 on the ubitx to the AGC board is very short!  It
has RF on it and a long wire will impact stability
and possibly introduce noises.

Better way to attach to base of Q10 is through a small resistor
of 100 ohms to reduce the amount of RF on the wire.

Allison

Re: Attach G4HUP buffer to underside of uBITX PCB? #ubitx #sdr

ajparent1/KB1GMX <kb1gmx@...>
 

That would seem a reasonable way to proceed.
there is a larger area of copper under the board
that is mostly ground (circuit common).

Ideally a wire under 1cm is a good thing but in
general shorter is better and in general a solid
short ground from the buffer to the ubitx board
is desired as well.

Allison

Re: uBITX v5.1 and uBITX_Manager_V1.11 problem

pd0zz@...
 


Thanks for this info!
It works now with the CEC 1.20 software... Next step AGC...  and nexion 3.2 or somewhat bigger... and CAT-control... perhaps an arduino powered tuner..
Ohw, wait, what about portability? A 4S lifepo battery seems more adequate.


Op 18-10-2019 om 12:01 schreef Herman Scheper:

At home now.

 

Look in next link. With this information it works for me……

 

http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html

 

 

 

Hart.groet,  Herman Scheper PA0BAB

 

Van: BITX20@groups.io <BITX20@groups.io> Namens Herman Scheper
Verzonden: donderdag 17 oktober 2019 23:05
Aan: BITX20@groups.io
Onderwerp: Re: [BITX20] uBITX v5.1 and uBITX_Manager_V1.11 problem

 

First you have to use Xloader software to programm the Arduino nano with the CEC hex file you need. You can find it on the hamskey.com website. I am now on the wrong place to inform you better. It take me a week before i get it running on my ubitx v5. Before have Xloader working take a day for me as Arduino nano rookie.  I printed a lot of information all coming from the Hamskey site.  Veel succes van PA0BAB

Herman vanaf z'n IPad.


Op 17 okt. 2019 om 22:23 heeft pd0zz@... het volgende geschreven:

Hello, the arduino nano in my newly installed uBITX V5.1 is unreacheble from the program uBITX_Manager_V1.11.
I wanted to install uBITX_CEC_V1.200, but alas, as rookie I can't get it working.
The problem is that uBITX-Manager cannot contact the arduino, even after checking portsettings in win10.
Tell me what to do?
Thanks, Martin

 

Virusvrij. www.avast.com

µBITX : Try starting to build a new kit .....

Behiels Jean-Pierre
 

Evening Erich,

 

First of all my big thanks for your first help and info’s around the µBITX subject.

The info about the NIXTION screens I could not direct find on HF signals,was this,or is this a available kit to order ?

All other things you presume I do have found.

I like to obtain a µBITX with a TFT screen on it,with all this nice information on it like S-meter and signal bandscope and so on ..

I do have to change from standard µBITX software to another version to obtain those features I understood well ?

I do have to find a lot and to read before I can start.

But I already can start to buy the Standard µBITX kit from Fahran on www.hfsignals.com

Despite I do have receive poor respons from other builders concerning my question and E-mail,about starting with this nice project..

I hope I can finish it all in good order …

I just have found this website where is a lot on : http://ubitx.net/

I hope this will help me further on the way to start build the kit…

 

 

With kindly regards Jean ON4AEF.

 

 

E-mail : ON4AEF@...

 

 

 

 

 

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of HB9FIH
Sent: maandag 21 oktober 2019 13:14
To: BITX20@groups.io
Subject: Re: [BITX20] µBITX : Try starting to build a new kit .....

 

Bonjour Jean-Pierre

I am (was) in same progress / state for decisions. But now I have ordered all parts for me.

- AGC - bestellt (from kit-projects.com)
- CW Filter (300/1000Hz) - bestellt (from SOTABEAMS)

- Touch Display 2.8" - bestellt - (from hf-signals)
- ALU Case - the Parts from a manufacturer in Germany

Here in my blog I write all about my uBITX build: http://www.hb9fih.org/?p=p_629&sName=ubitx-2019

I am still in TA3 - mid of November all parts should be arrive (some are already arrived) in HB9.

I will start in December in my QTH on EA8 to build them up.

Erich


Virusvrij. www.avast.com

Re: LM324 AGC Issue

Murray Wills (ZL2IQ)
 

Thanks. Yes I have been following the instructions. I am going to check the resister values today as R1 or R2 could be wrong. M


From: BITX20@groups.io <BITX20@groups.io> on behalf of Joe Puma via Groups.Io <kd2nfc@...>
Sent: Tuesday, October 22, 2019 3:30:18 AM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] LM324 AGC Issue
 
You have to calibrate the POTs on the top row. It’s in the notes of the build and calibration. If you did that step then something is wrong. If I recall the second pot on the top of board from the left adjusts the voltage for the LM chip. The 4v is desired voltage to power LM chip.  

Joe
KD2NFC


On Oct 21, 2019, at 10:14 AM, Joel Caulkins/N6ALT <caulktel@...> wrote:

Here you go.

Joel
N6ALT
<AGC Details.pdf>
<AGC Details.pdf>

Re: LM324 AGC Issue

Murray Wills (ZL2IQ)
 

Allison. Thank you. That is a good tip.
I will introduce that resister once I have it working.
73 de
Murray ZL2IQ


From: BITX20@groups.io <BITX20@groups.io> on behalf of ajparent1/KB1GMX via Groups.Io <kb1gmx@...>
Sent: Tuesday, October 22, 2019 5:26:57 AM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] LM324 AGC Issue
 
One further issue is to insure the wire from the base of
Q10 on the ubitx to the AGC board is very short!  It
has RF on it and a long wire will impact stability
and possibly introduce noises.

Better way to attach to base of Q10 is through a small resistor
of 100 ohms to reduce the amount of RF on the wire.

Allison

Re: µBITX : Try starting to build a new kit .....

HB9FIH
 

 

OK Jean

I found most Infos here:
Thats the creator of the CEC firmware 
This Firmware has build in the support for the Nextion Displays and further supports the S-Meter.
The AGC from kit-projects.com can be connected direct to the Nextion without any more Hardware.
They write in the instruction (this you can only see this in your Downloads if you bought this product):
"S-Meter Tap
Last but not least is the S-meter. The tap has been tested and setup for the CEC firmware via the A7
pin. If you would like to use a external S-meter some form of calibration circuit will be needed.
This has also been tested and working with the TSW BITeensio via Pin A19
 "
The Nextion Screen It was hard to find....at least I found them in Amazoon from a seller in UK.
- I choosed the 2.8" because its sure this works, 2. Its enough big otherwise the TX becomes big. (the Yaesu FT-991 has also not a bigger one)
 
The Audio Filter are Universal or CW (you must choose by order). The Universal is more wide. If you alsi work SSB better the universal, if you work more CW the the CW. The CW has 2 LED 1. matching the 700Hz and 2. Overload.


Assembling:
I also make the plan:
1. uBITX must run perfect in Original Edition
then:
3. Load the CEC Fimware (CEC ist the Firmware from KD9CEC (www.hamskey.com - see above)
(the CEC Firmware runs also with the Original Display 16x2) - this firmware replaces the Original.
4. apply the Nextion Display

Additional I will do:
- An additional Audio output (3.5mm Audio) for connection to a PC for eg FLGigi etc for a Waterfall
This I connect by the Otuput of AGC (its the High connection for the Volume potentiometer- - the AGC pulls down this point if the sigs are too loud - so I also have no overload in the Waterfall on PC)
- Pressing the VFO/Tuning is the Button for reching the menue. I will make an additional Button for this. Because if you press the VFO-Knob maybe you turn a bit on the VFO for Frequency.
- if the build in Keyer is not so comfortable to handle then I build a keyer with the IC K16 IC  https://hamcrafters2.com/K16IC.html  ( I already made abt 5 pcs.. works perfect)
(make then 5 Buttons 1/M 2 3 4 for Menu and Messages and a button direct for tuning (if you have eg an automatic antenna tuner) 
 

I know - at beginning you know nothing but you have to know all - later you know all but deep knowledge is no more necessary.
 
The case I made a bit bigger as necessary (Its now like an A4 paper). I have space to build in additional modules.
eg an Audio amplifier and a speaker.
 
I have now time to plan and organize all this things (I hope perfect) here from TA3  - because all must be ready when I travel back for 1 week to HB9. After 1 week in HB9 travelling continous to EA8 - and there I assemble the uBITX. So I must have all parts ready to take with me.
 
OK Jean hope this helps ... feel free to contact me - 
 
73 Erich
 
btw: also own 4 QCX from Hans.... Now I am planning to visit him in TA4 Dalyan its abt 350 km from here TA3 Ayvalik.
---
..................
vy 73 Erich Rieder
HB9FIH
HS0ZLS

Webseite ist NEU unter: http://www.hb9fih.org

 

Am 2019-10-21 21:38, schrieb Behiels Jean-Pierre:

Evening Erich,

 

First of all my big thanks for your first help and info's around the µBITX subject.

The info about the NIXTION screens I could not direct find on HF signals,was this,or is this a available kit to order ?

All other things you presume I do have found.

I like to obtain a µBITX with a TFT screen on it,with all this nice information on it like S-meter and signal bandscope and so on ..

I do have to change from standard µBITX software to another version to obtain those features I understood well ?

I do have to find a lot and to read before I can start.

But I already can start to buy the Standard µBITX kit from Fahran on www.hfsignals.com

Despite I do have receive poor respons from other builders concerning my question and E-mail,about starting with this nice project..

I hope I can finish it all in good order ...

I just have found this website where is a lot on : http://ubitx.net/

I hope this will help me further on the way to start build the kit...

 

 

With kindly regards Jean ON4AEF.

 

 

E-mail : ON4AEF@...

 

 

 

 

 

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of HB9FIH
Sent: maandag 21 oktober 2019 13:14
To: BITX20@groups.io
Subject: Re: [BITX20] µBITX : Try starting to build a new kit .....

 

Bonjour Jean-Pierre

I am (was) in same progress / state for decisions. But now I have ordered all parts for me.

- AGC - bestellt (from kit-projects.com)
- CW Filter (300/1000Hz) - bestellt (from SOTABEAMS)

- Touch Display 2.8" - bestellt - (from hf-signals)
- ALU Case - the Parts from a manufacturer in Germany

Here in my blog I write all about my uBITX build: http://www.hb9fih.org/?p=p_629&sName=ubitx-2019

I am still in TA3 - mid of November all parts should be arrive (some are already arrived) in HB9.

I will start in December in my QTH on EA8 to build them up.

Erich

 

Virusvrij. www.avast.com

Re: µBITX : Try starting to build a new kit .....

Curt
 

Jean

Across the board, all these merchants and firmware providers are volunteers,  even hfsignals. So be patient.  your big decision,  after selecting the display, is your case solution.  the basic firmware is fine to evaluate your wiring and first qsos. Don't be too quick to update it. Enjoy your build.

Curt

Re: kit-projects.com ND6T AGC - how to verify / S-meter settings / RF gain control #ubitx

Curt
 

On the agc, start with it off, find a dreadfully loud signal, and switch it on. It mostly acts only on big signals, you still need to manually operate the volume control for many signals. I find agc mostly useful to tune across a band without getting blasted.

Curt

Re: kit-projects.com ND6T AGC - how to verify / S-meter settings / RF gain control #ubitx

Philip
 

On Sun, Oct 20, 2019 at 10:19 PM, Rob French (KC4UPR) wrote
The ND6T AGC acts more as a limiter, as it has no gain in its own right.
So it can reduce strong signal, but not boost low ones.

Philip G7JUR 

Re: kit-projects.com ND6T AGC - how to verify / S-meter settings / RF gain control #ubitx

Rob French (KC4UPR)
 

Curt and Phillip, thanks for the replies.  I think maybe I just didn't have enough strong signals around.  I was using it today, and the AGC definitely had an effect, and I could definitely see a difference when I turned it off.

This may be a dumb question, but is it normal that I would not get S-meter readings when AGC is off?  (using the S-meter tap on the ND6T AGC board)

Re: kit-projects.com ND6T AGC - how to verify / S-meter settings / RF gain control #ubitx

 

Rob,

 Yes it must be on to get a S-meter reading.

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: Testing Crystal Filters maximum dbm

iz oos
 

Great advices and explanation Allison! What about testing SAW filters, is there a so stringent limit to - 10dbm (like crystal filters) to test them safely?


Il 21/ott/2019 18:17, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:
Iz,

think about that.... 
-10dbm is about .1milliwatt,  +16dbm is 40milliwatts or about 400 times greater power.

Crystal filter and crystals in singular use generally have a max power of about
1mW (0dbm) for most while some of the older slab rocks in FT243 cases could
take much more.

Why the limit, two things its mechanical vibration and the consequence is heat.
Too much heat and crystals crack or lead bonds fail.

I have swept filters and generally I use -10dbm for safety. Since the average filter is 
about 3-8db loss that is more than enough drive to see a signal on the other side.
So a source side 20db attenuator is pretty much required.  Also the source
impedance is then solidly known making it easier to add the needed transformer
or network to match the input of the filter.  You will likely have to have the same
network to match the detector side as well.

Allison

Re: Testing Crystal Filters maximum dbm

iz oos
 

I would add the same question for ceramic filters and resonators.


Il 22/ott/2019 11:21, "iz oos via Groups.Io" <and2oosiz2=gmail.com@groups.io> ha scritto:

Great advices and explanation Allison! What about testing SAW filters, is there a so stringent limit to - 10dbm (like crystal filters) to test them safely?


Il 21/ott/2019 18:17, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:
Iz,

think about that.... 
-10dbm is about .1milliwatt,  +16dbm is 40milliwatts or about 400 times greater power.

Crystal filter and crystals in singular use generally have a max power of about
1mW (0dbm) for most while some of the older slab rocks in FT243 cases could
take much more.

Why the limit, two things its mechanical vibration and the consequence is heat.
Too much heat and crystals crack or lead bonds fail.

I have swept filters and generally I use -10dbm for safety. Since the average filter is 
about 3-8db loss that is more than enough drive to see a signal on the other side.
So a source side 20db attenuator is pretty much required.  Also the source
impedance is then solidly known making it easier to add the needed transformer
or network to match the input of the filter.  You will likely have to have the same
network to match the detector side as well.

Allison

Re: Testing Crystal Filters maximum dbm

Balasubramanyan Cp
 

😀😀😀   😁😀😁😊😀😁😊😀😁😊   

On Mon, Oct 21, 2019 at 6:21 PM iz oos <and2oosiz2@...> wrote:

I am a proud owner of Antuino. I think it delivers around +10dbm in SNA plot function (correct me if I am wrong) at the RF out and at RF in on SWR plot function. Even if it shows - 20db on the plot. I have seen specs of crystal filters suggesting a maximum level of - 10dbm. So around 20db attenuator should be carefully added between the the Antuino and the crystal filter. Is this correct? I have seen however a datasheet of a crystal filter saying -10dbm max, however +16dbm for less than 10 seconds. So I am a bit confused on how to test safely crystal filters with an antenna analyzer or Antuino.

Re: Testing Crystal Filters maximum dbm

 

Iz,

The antuino is designed to output -20dbm at SNA port but a lot of them have escaped the plant
at -10db and -10dbm saturates the AD8307 and flatten the peaks. Change R20 to 1.2K and the
in/out short show display -20dbm on the display.

Raj


At 21-10-19, you wrote:

I am a proud owner of Antuino. I think it delivers around +10dbm in SNA plot function (correct me if I am wrong) at the RF out and at RF in on SWR plot function. Even if it shows - 20db on the plot. I have seen specs of crystal filters suggesting a maximum level of - 10dbm. So around 20db attenuator should be carefully added between the the Antuino and the crystal filter. Is this correct? I have seen however a datasheet of a crystal filter saying -10dbm max, however +16dbm for less than 10 seconds. So I am a bit confused on how to test safely crystal filters with an antenna analyzer or Antuino.

Re: Testing Crystal Filters maximum dbm

 

I forgot to mention the SNA out is square wave.


At 22-10-19, you wrote:
Iz,

The antuino is designed to output -20dbm at SNA port but a lot of them have escaped the plant
at -10db and -10dbm saturates the AD8307 and flatten the peaks. Change R20 to 1.2K and the
in/out short show display -20dbm on the display.

Raj

At 21-10-19, you wrote:

I am a proud owner of Antuino. I think it delivers around +10dbm in SNA plot function (correct me if I am wrong) at the RF out and at RF in on SWR plot function. Even if it shows - 20db on the plot. I have seen specs of crystal filters suggesting a maximum level of - 10dbm. So around 20db attenuator should be carefully added between the the Antuino and the crystal filter. Is this correct? I have seen however a datasheet of a crystal filter saying -10dbm max, however +16dbm for less than 10 seconds. So I am a bit confused on how to test safely crystal filters with an antenna analyzer or Antuino.