Date   
Re: Mics, speech processor? #ubitx

ON7HC
 

Hi John,

I'm using this Ebay item : 253088080650  ($2.27).
It is not really a compressor but rather an automatic gain MIC amplifier. It is very sensitive and your sound quality remains clear. You don't have to shout in the microphone to generate some output ... :)
In my Bitx40 it replaces the original MIC amplifier. The AGC function prevents overloading of the TX chain, so your power remains clean and within the limits.
I'm curious wether a real compressor circuit would still be a better solution for this kind of radio.

Herman - ON7HC

Re: UbitX Mods & fixes

Bill Robbins
 

Boy would I second that.   I have been working on many projects in front of the bitx and it will still be several months before I get at it.  I’m sure I will want to revisit many of these issues.

I also want to express my wonder at the level of knowledge and willingness to share by this group.

Bill
WA8CDU

Sent from my iPad

On Jan 3, 2018, at 7:11 AM, Art Howard <k0kuk.vhf@...> wrote:

Hello all,
 With all the information that's being disseminated on the UbitX I think it would be real nice if somebody did up a repository into various sections by subject. Such as AGC, tuner, etc. 
 That way people could enter their information into various sections instead of being spread all over the place and very difficult to find with same questions being asked several times etc.
 Maybe they're already is such a thing I don't know. But if there is I would like to know about it.
73
Art
 

Re: uBitx AGC mod

Diver Martin <diver.martin@...>
 

Herman ON7HC,

Interesting.  Maybe I'll have an AGC-off... my usual PCB vendor is $9.50 for 10x PCB's, but $18 shipping if I want fedex (HK Post $6 if I want to for the slow boat, or $12 for DHL if I want the packaged delivered to me Ace Ventura style...).  I'll look at the schematic a little more closely.  Might be able to use the variable attenuation part as the current IF amp has enough gain as-is in the uBitx... A hybrid of the two perhaps?

Chris:  They look correct to me, both in the original schematic and my version... Emitter towards ground (pin 2 on the SOT23 form of MMBT3904)...

On Wed, Jan 3, 2018 at 5:01 AM, ON7HC <herman.docx@...> wrote:
Hi Martin,

Please read #32103 + 14 related messages.

It's a AGC developed by Jim, ND6P.  I build it some time ago and it's working like a charm !
The AGC is audio derived, but attenuates the RF input, using pin diodes. I've used it on my Bitx40 build. The AGC acts like in a commercially build radio :)
Could be interesting ...

Herman - ON7HC




--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?

Re: UbitX Mods & fixes

Karl Heinz Kremer, K5KHK
 

You can do this in the group's Wiki. If you are viewing this page in your web browser, you should see a navigation area on the left side. The last item is "Wiki" - when you click on that, you can read all existing Wiki pages, add information, and create new pages. For now, there is a placeholder page for all uBITX related information. Please feel free to add any information you find useful to that hierarchy. I would recommend to group information that is related on their own pages (e.g. all troubleshooting tips on one page, all mods linked from one page and so on). 
--
Karl Heinz - K5KHK

Re: Mics, speech processor? #ubitx

Arvo W0VRA
 

A couple of people are looking at an Analog Devices SSM2167 chip on a board.

https://groups.io/g/BITX20/topic/6468223

I'm waiting for mine to come in.

Re: Tell me your favorite uBitx mods

Doug W
 

It would require a new connector or adapter but here is another option if you are better at circles than squares.
https://www.amazon.com/BATIGE-Female-Extension-Motorcycle-Dashboard/dp/B01LYC9NC6



or one like this with an audio jack


Doug   KD9CYF

Re: Recycled case for uBitx

Daniel Conklin
 

Nice work! I was thinking about this exact thing the other day.  You should put the #UBITX hashtag on your post.

Re: uBitx AGC mod

Michael Hagen
 

Maybe this?

http://www.qrparci.org/wa0itp/chap13.pdf

Mike, WA6ISP



On 1/3/2018 2:02 AM, William R Maxwell wrote:

Ah, thankls.


On 3/01/2018 7:14 PM, Alan G4NMA wrote:
'Harris' appears to be Frank W Harris K0IYE.


-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: #ubitx Power output on 40 / 80 m with high current levels #ubitx

Alex - PA1FOX
 

Hi Nigel,

Great to hear from you :)

John,

I think I have made a big mistake, or actually two:

The first is that I thought I was using T37-10 for the output transformer but in fact it was an FT37-43. As both are black and equal in size it took some time to find out (only that I had not used any of the newly bought T37-10's since they were all still present in the purchase package.) I did try the T37-10 but it gave no improvement.

The second is that I had not found the correct winding details for the transformer. I was using the trifilair setup which is used all over the rig and what would be indicated by the way the inductors in the schematic are drawn. It was later that I found a message on this board from Ashhar stating the transformer should be 8 windings input and 10 windings output.

I changed this and a whole new situation occurred. After all it is all about impedance matching.
At 80m I now get a whopping 18 watts at 3,75A overall rig current which is still too high for battery powered. At 17m it reduces to 3 watts. On all bands I have a reasonably good efficiency now so I am making progress and getting closer. I need to work out the loss of 8 dB's in gain of the overall TX chain when going from 3.5MHz to 18 MHz. ( 3 versus 18 watts) Thanks to the WA2EBY article I have some ideas. 

Incidentally, it would be nice to see exactly how your particular layout
differs from that of hfsigs. Can you upload a picture or two?
And I presume it is more through-the-hole and not smd parts. No?
It may be that the choice of parts is more critical than first believed.

Well John, I will do so after I get some things sorted out. It's always a problem when you start with a nice idea and layout and after spending hours and hours of testing the end result looks less nice than it was when you started. It is mainly built in SMD style, using a mill to create the PCB lines. This is ideal for experimentation. I think my PCB size is about the same as the commercially sold one, but I use both sides of the PCB:

One side: Mic audio and speaker audio, modulator, crystal filter (with room for extra narrow crystal filter for CW) bitx blocks and all frequency converters, TX chain, LPF's and relays.

Other side: mic preamp, 3 holders for batteries, 4xAAA, 4xAAA, 2xAAA. (total of 10 penlights AAA makes 12 volts). charging circuit for these batteries to charge them from an external 12 volt power supply. (by splitting the battery pack into two parts and charge both parts seperately. I stole the idea from an ICOM CM7 battery pack) Also the speaker is included as well as connections to the arduino and SI5351 Adafruit board. I don't use the Raduino.

All is built in a single Teletron T813 housing. If all is well I will have a self powered uBitx with about the size of the housing of Ashhar's in his first uBitx video but about half the height. Google for the T813 or look here http://aprs.gids.nl/t813/t813dt_03.jpg for an idea.
I'll make some photos soon.

Thanks for sharing ideas and experiences, it all helps.

73, Alex
PA1FOX

Re: uBitx AGC mod

Diver Martin <diver.martin@...>
 

*dingdingding* cool, thank you Mike!  Good to have a more solid source on that.  I've made sure to bookmark the particular link to the full book, and add a copy to my personal library.

I think tonight I'm also going to have to break out my copy of EMIRD, see if I can find anything else in there.

I'm not super-inspired to design my own AGC circuit for this mod, mostly would prefer to use something known / proven to work well :)  Plenty for future reference though...

On Wed, Jan 3, 2018 at 7:48 AM, Michael Hagen <motdog@...> wrote:

Maybe this?

http://www.qrparci.org/wa0itp/chap13.pdf

Mike, WA6ISP



On 1/3/2018 2:02 AM, William R Maxwell wrote:

Ah, thankls.


On 3/01/2018 7:14 PM, Alan G4NMA wrote:
'Harris' appears to be Frank W Harris K0IYE.


-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...




--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?

Re: uBitx AGC mod

chris gress <Chrisg0wfh@...>
 

Looking at that circuit emitter on q5/q4 going though inductor and resistor to RX vc RX vc I take is positive since when do you have collector to collector in each of the 2 transistors and both been non don't seam correct to me 

On 3 Jan 2018 15:48, "Michael Hagen" <motdog@...> wrote:

Maybe this?

http://www.qrparci.org/wa0itp/chap13.pdf

Mike, WA6ISP



On 1/3/2018 2:02 AM, William R Maxwell wrote:

Ah, thankls.


On 3/01/2018 7:14 PM, Alan G4NMA wrote:
'Harris' appears to be Frank W Harris K0IYE.


-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: uBitx AGC mod

Ken
 

On Wed, Jan 3, 2018 at 10:58 AM, Diver Martin <diver.martin@...> wrote:
*dingdingding* cool, thank you Mike!  Good to have a more solid source on that.  I've made sure to bookmark the particular link to the full book, and add a copy to my personal library.

I think tonight I'm also going to have to break out my copy of EMIRD, see if I can find anything else in there.

I'm not super-inspired to design my own AGC circuit for this mod, mostly would prefer to use something known / proven to work well :)  Plenty for future reference though...

On Wed, Jan 3, 2018 at 7:48 AM, Michael Hagen <motdog@...> wrote:

Maybe this?

http://www.qrparci.org/wa0itp/chap13.pdf

Mike, WA6ISP



On 1/3/2018 2:02 AM, William R Maxwell wrote:

Ah, thankls.


On 3/01/2018 7:14 PM, Alan G4NMA wrote:
'Harris' appears to be Frank W Harris K0IYE.


-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...




--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?


Almost all of the firmware has been modified to fix known bugs and enhance CAT communications.

Ian Lee
 

I have been working on the last weekend and is now in beta testing. As I worked on it, I modified a lot of code. so  want someone to help me with the beta test.
Of course, the firmware will be released soon and the source code will be released. Because we'll enjoy it with uBITX

Please email me if you have a test before the release.

Last full test Movie before release for tester
https://www.youtube.com/watch?v=GKS1p41CP_s&t=531s

To upgrade the firmware, click the link below. 
http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html

Since I have registered the original firmware on the link above, you can restore it to the original firmware whenever you do not like my new firmware.
Do not worry.

The firmware was based on Fashar's uBITX 0.2.

Modified or added functionality

1.Most of the bugs I found were fixed.
  - CW Tone code configuration Problem,
  - Frequency Control Problem - Go to 4 Ghz when going below 0,
  - Screen Update Problem,
  - Frequency Display Problem - Problems occur below 1Mhz,
   and more...

 2.Enhanced CAT communication.
  Compatible with FT-817 and FT-857.
  I tested HRD, WSJT-X, JT65-HF ...
  However, You may get an error re-organizing to release the program.

3.CAT communication is not broken in CW or TX mode.
 If communication is interrupted by strong radio waves, it will probably be recovered within 10 seconds.
 include auto recovery - I have been programming with the FT-817 about 15 years ago, but I have experienced some broken protocol on TX occasionally. So I put this feature in.

4.New CAT Protocol Implemention
  - Read Write Frequency
  - switch VFOA / VFOB 
  - Read Write CW Speed
  - Read Write CW Delay Time
  - Read Write CW Pitch (with sidetone)
 
  All of these can be controlled by Hamradio deluxe.

4.Save mode when switching to VFOA / VFOB
5.Ability to change CW Delay
  Since it is fixed at 600ms now, there is a problem when communicating over 15wpm.
  You can change it with the radio dial, or change it via Hamradio deluxe.

6.Added Dial Lock function
  Because the encoder is sensitive, the recognition frequency will change sometime. so Added Dial lock function
  Press the function key for more than 3 seconds to lock or unlock.
 
7.The first time you press the CW key, it reduces the time to TX.
  However, we have added a function that can delay the transmission time of CW when switching to TX by CW key.
  When I tested it with my receiver, there was no big problem in transferring without delay (TX -> CW Interval).  But I implemention a TX->CW interval feature for personal choice.
  This may be useful when using external amp.
 
And more small modifications...

--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: No TX #ubitx

joe kallo <quietglow@...>
 

Does it matter which side of the cap the antenna/lead is hooked to? If I were sitting at home instead of at work I'd probably just try both, but since I have a computer but not the radio here...

And the receiving radio I am using to test should pick up the weak signal w/o an antenna connected right? 

Sorry for the newb questions. I have lots of experience building electronics, but this is the first time I've messed with RF.

Re: Almost all of the firmware has been modified to fix known bugs and enhance CAT communications.

Ashhar Farhan
 

have you tried cat with wsjtx?

On 3 Jan 2018 9:48 pm, "Ian Lee" <kd8cec@...> wrote:
I have been working on the last weekend and is now in beta testing. As I worked on it, I modified a lot of code. so  want someone to help me with the beta test.
Of course, the firmware will be released soon and the source code will be released. Because we'll enjoy it with uBITX

Please email me if you have a test before the release.

Last full test Movie before release for tester
https://www.youtube.com/watch?v=GKS1p41CP_s&t=531s

To upgrade the firmware, click the link below. 
http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html

Since I have registered the original firmware on the link above, you can restore it to the original firmware whenever you do not like my new firmware.
Do not worry.

The firmware was based on Fashar's uBITX 0.2.

Modified or added functionality

1.Most of the bugs I found were fixed.
  - CW Tone code configuration Problem,
  - Frequency Control Problem - Go to 4 Ghz when going below 0,
  - Screen Update Problem,
  - Frequency Display Problem - Problems occur below 1Mhz,
   and more...

 2.Enhanced CAT communication.
  Compatible with FT-817 and FT-857.
  I tested HRD, WSJT-X, JT65-HF ...
  However, You may get an error re-organizing to release the program.

3.CAT communication is not broken in CW or TX mode.
 If communication is interrupted by strong radio waves, it will probably be recovered within 10 seconds.
 include auto recovery - I have been programming with the FT-817 about 15 years ago, but I have experienced some broken protocol on TX occasionally. So I put this feature in.

4.New CAT Protocol Implemention
  - Read Write Frequency
  - switch VFOA / VFOB 
  - Read Write CW Speed
  - Read Write CW Delay Time
  - Read Write CW Pitch (with sidetone)
 
  All of these can be controlled by Hamradio deluxe.

4.Save mode when switching to VFOA / VFOB
5.Ability to change CW Delay
  Since it is fixed at 600ms now, there is a problem when communicating over 15wpm.
  You can change it with the radio dial, or change it via Hamradio deluxe.

6.Added Dial Lock function
  Because the encoder is sensitive, the recognition frequency will change sometime. so Added Dial lock function
  Press the function key for more than 3 seconds to lock or unlock.
 
7.The first time you press the CW key, it reduces the time to TX.
  However, we have added a function that can delay the transmission time of CW when switching to TX by CW key.
  When I tested it with my receiver, there was no big problem in transferring without delay (TX -> CW Interval).  But I implemention a TX->CW interval feature for personal choice.
  This may be useful when using external amp.
 
And more small modifications...

--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Emailing: P1000560, P1000559

Michael Hagen
 

Your message is ready to be sent with the following file or link attachments:
P1000560
P1000559

Note: To protect against computer viruses, e-mail programs may prevent sending or receiving certain types of file attachments. Check your e-mail security settings to determine how attachments are handled.

--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...

Re: uBitx AGC mod

Diver Martin <diver.martin@...>
 

Ah-hah Chris, I see what you're saying.  I think you're right.  For simplicity, assuming RX_V is 10V and ignore R20 (120ohm), base of Q5 is 5V, the emitter (should be collector) is 10V through T4.

Methinks this will be something to simulate in LTSpice :)  I will probably also need to adjust for a 45MHz IF, this is probably designed for 12MHz reading the rest of the chapter.

On Wed, Jan 3, 2018 at 8:03 AM, chris gress <Chrisg0wfh@...> wrote:
Looking at that circuit emitter on q5/q4 going though inductor and resistor to RX vc RX vc I take is positive since when do you have collector to collector in each of the 2 transistors and both been non don't seam correct to me 

On 3 Jan 2018 15:48, "Michael Hagen" <motdog@...> wrote:

Maybe this?

http://www.qrparci.org/wa0itp/chap13.pdf

Mike, WA6ISP



On 1/3/2018 2:02 AM, William R Maxwell wrote:

Ah, thankls.


On 3/01/2018 7:14 PM, Alan G4NMA wrote:
'Harris' appears to be Frank W Harris K0IYE.


-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...




--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?

Re: Almost all of the firmware has been modified to fix known bugs and enhance CAT communications.

John Seboldt K0JD
 

Does the CW tone function actually change the CW offset as well, so if you tune to the sidetone pitch you're zero beat with the station?

John K0JD


On 1/3/2018 10:17, Ian Lee wrote:
I have been working on the last weekend and is now in beta testing. As I worked on it, I modified a lot of code. so  want someone to help me with the beta test.
Of course, the firmware will be released soon and the source code will be released. Because we'll enjoy it with uBITX

Please email me if you have a test before the release.

Last full test Movie before release for tester
https://www.youtube.com/watch?v=GKS1p41CP_s&t=531s

To upgrade the firmware, click the link below. 
http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html

Since I have registered the original firmware on the link above, you can restore it to the original firmware whenever you do not like my new firmware.
Do not worry.

The firmware was based on Fashar's uBITX 0.2.

Modified or added functionality

1.Most of the bugs I found were fixed.
  - CW Tone code configuration Problem,
  - Frequency Control Problem - Go to 4 Ghz when going below 0,
  - Screen Update Problem,
  - Frequency Display Problem - Problems occur below 1Mhz,
   and more...

 2.Enhanced CAT communication.
  Compatible with FT-817 and FT-857.
  I tested HRD, WSJT-X, JT65-HF ...
  However, You may get an error re-organizing to release the program.

3.CAT communication is not broken in CW or TX mode.
 If communication is interrupted by strong radio waves, it will probably be recovered within 10 seconds.
 include auto recovery - I have been programming with the FT-817 about 15 years ago, but I have experienced some broken protocol on TX occasionally. So I put this feature in.

4.New CAT Protocol Implemention
  - Read Write Frequency
  - switch VFOA / VFOB 
  - Read Write CW Speed
  - Read Write CW Delay Time
  - Read Write CW Pitch (with sidetone)
 
  All of these can be controlled by Hamradio deluxe.

4.Save mode when switching to VFOA / VFOB
5.Ability to change CW Delay
  Since it is fixed at 600ms now, there is a problem when communicating over 15wpm.
  You can change it with the radio dial, or change it via Hamradio deluxe.

6.Added Dial Lock function
  Because the encoder is sensitive, the recognition frequency will change sometime. so Added Dial lock function
  Press the function key for more than 3 seconds to lock or unlock.
 
7.The first time you press the CW key, it reduces the time to TX.
  However, we have added a function that can delay the transmission time of CW when switching to TX by CW key.
  When I tested it with my receiver, there was no big problem in transferring without delay (TX -> CW Interval).  But I implemention a TX->CW interval feature for personal choice.
  This may be useful when using external amp.
 
And more small modifications...

--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: Almost all of the firmware has been modified to fix known bugs and enhance CAT communications.

tom van der meer
 

Ft8 working great with beta

Re: Mics, speech processor? #ubitx

Michael Hagen
 

Here is my mic with a speech processor in it.  I used the Mic and Sw supplied with BitX.

The PCB is tiny and fits up in the mic tube.  All parts were 3d Printed.

I have only tested it on the scope, the pot can adjust the output all the way to zero.

Testing showed constant output with 1-10mv signal from a generator.

I have provided a schematic.  It is basically made from an AP Note on the IC.

I also have a PCB in BitX that senses the PTT switch on the mic and activates Transmit.

This saves a wire to the Mic, and I can use standard 3.5 mm Stereo cord.   A 6 ft. double ended male was

0.99 at the 99 Cent store,  I cut it in half, making 2 cables.

73's

Mike, WA6ISP


On 1/3/2018 7:39 AM, Arvo KD9HLC via Groups.Io wrote:
A couple of people are looking at an Analog Devices SSM2167 chip on a board.

https://groups.io/g/BITX20/topic/6468223

I'm waiting for mine to come in.

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...