Date   

Re: 80/40 power increase if possible

pete torrance <wayfound2000@...>
 

Yep thanks Rubens...for the tips and sharing your experiences.  thank goodness the PA transistors don't cost too much to replace.
73
pete



Sent from my Samsung Galaxy A3 2016 - powered by Three

-------- Original message --------
From: Rubens Kamimura <rubens.kamimura@...>
Date: 22/04/2020 19:46 (GMT+00:00)
To: BITX20@groups.io
Subject: Re: [BITX20] 80/40 power increase if possible

Pete G4HAK, good night.

You have already observed the value of C81 and if VR-1, it is at the limit switch (counterclockwise). See in previous posts related to the subject. I believe that in order to give your IRF510's a vitamin (testosterone), you will need to readjust your IBF of the IRF510 to the new voltage + B PA-PWR. I burned several IRF510s by making new IBias adjustments for the IRF510s. I suggest installing a Step up (13.8VDC_24VDC booster converter), placing a 24VDC @ 70W lamp in series to adjust the Ibias of the IRF510, this way you will limit the current and burning of the PA transistors. Note that the conductors from the source to the PA PWR connector are thin. If you choose to put more power, change the conductors and review the connections, because mine melted with the high current. The transistors will heat up a little more, put thermal paste on the transistors of the PA (between the transistor and heat sink), install a fan also for warranty.
good luck. 73 by Rubens PY2PVB.

Em qua., 22 de abr. de 2020 às 10:51, pete torrance via groups.io <wayfound2000=yahoo.com@groups.io> escreveu:
Hi 
Ubitx V3 here. I am only really interested in using 80 and 40m SSB and I am getting around 10W on 40 and 12W on 80. All fine and dandy but would like to increase this if possible. Ive seen loads of posts about increasing the PA voltage but am a bit confused about where the breaks should be to isolate the PA supply V ? Considering some of the other component change suggestions re: extra power out but find these days that my fumbly fingers don't match well with tiny components Verses soldering iron! Any expert advice would be really appreciated!
Have fun!
Pete G4HAK


Re: 80/40 power increase if possible

pete torrance <wayfound2000@...>
 

Hi gary
Thanks for the info. so easy to think clockwise is more! great transceiver and great learning curve. pure amateur radio!
73
Pete 



Sent from my Samsung Galaxy A3 2016 - powered by Three


Re: 80/40 power increase if possible

Gary Anderson
 

To add to Evan's advice,
RV2 and RV3 that set the bias for the IRF510's are wired counter-intuitive to most.  But it is well documented.
https://www.hfsignals.com/index.php/ubitx-tuneup/ 

Rgds,
Gary


Re: 80/40 power increase if possible

Rubens Kamimura
 

Pete G4HAK, good night.

You have already observed the value of C81 and if VR-1, it is at the limit switch (counterclockwise). See in previous posts related to the subject. I believe that in order to give your IRF510's a vitamin (testosterone), you will need to readjust your IBF of the IRF510 to the new voltage + B PA-PWR. I burned several IRF510s by making new IBias adjustments for the IRF510s. I suggest installing a Step up (13.8VDC_24VDC booster converter), placing a 24VDC @ 70W lamp in series to adjust the Ibias of the IRF510, this way you will limit the current and burning of the PA transistors. Note that the conductors from the source to the PA PWR connector are thin. If you choose to put more power, change the conductors and review the connections, because mine melted with the high current. The transistors will heat up a little more, put thermal paste on the transistors of the PA (between the transistor and heat sink), install a fan also for warranty.
good luck. 73 by Rubens PY2PVB.

Em qua., 22 de abr. de 2020 às 10:51, pete torrance via groups.io <wayfound2000=yahoo.com@groups.io> escreveu:

Hi 
Ubitx V3 here. I am only really interested in using 80 and 40m SSB and I am getting around 10W on 40 and 12W on 80. All fine and dandy but would like to increase this if possible. Ive seen loads of posts about increasing the PA voltage but am a bit confused about where the breaks should be to isolate the PA supply V ? Considering some of the other component change suggestions re: extra power out but find these days that my fumbly fingers don't match well with tiny components Verses soldering iron! Any expert advice would be really appreciated!
Have fun!
Pete G4HAK


Re: 80/40 power increase if possible

pete torrance <wayfound2000@...>
 

Ok that's good thankyou. great group this!
73



Sent from my Samsung Galaxy A3 2016 - powered by Three

-------- Original message --------
From: Evan Hand <elhandjr@...>
Date: 22/04/2020 19:19 (GMT+00:00)
To: BITX20@groups.io
Subject: Re: [BITX20] 80/40 power increase if possible

Understand that I am not an RF engineer, however, what I have read is that the bias would be dependant on the implementation.  Per this thread:
https://groups.io/g/BITX20/message/73757
The bias for an IRF510 would still be in the 50 to 150 ma range, so I would start with 100 ma for each of the devices.

Another watch out:  The drains of the IRF510 is connected to the heatsink tab.  Be sure to use insulators if you are going to mount them on a common heatsink, or if the larger heatsinks have a chance of touching another surface.  I would use them as the thermal resistance is not that high.

73
Evan
AC9TU


Re: 80/40 power increase if possible

Evan Hand
 

Understand that I am not an RF engineer, however, what I have read is that the bias would be dependant on the implementation.  Per this thread:
https://groups.io/g/BITX20/message/73757
The bias for an IRF510 would still be in the 50 to 150 ma range, so I would start with 100 ma for each of the devices.

Another watch out:  The drains of the IRF510 is connected to the heatsink tab.  Be sure to use insulators if you are going to mount them on a common heatsink, or if the larger heatsinks have a chance of touching another surface.  I would use them as the thermal resistance is not that high.

73
Evan
AC9TU


Re: Furlough 40 SSB Transceiver Project #homebrew

Dean Souleles
 

Hi all -

I realized I didn't send the correct link to the blog:

Please take a look and listen to the QSO.

https://kk4das.blogspot.com/2020/04/fourlough-40-first-ragchew-homebrew-to.html

Dean


Re: 80/40 power increase if possible

pete torrance <wayfound2000@...>
 


Evan. Ahh yes I have a largish heatsink already fitted which should be up to the task.  Any idea of roughly how much bias current would be appropriate for say 24V Rail?

Pete

On Wednesday, 22 April 2020, 17:56:07 BST, Evan Hand <elhandjr@...> wrote:


Pete,
Forgot to mention that you will need to increase the heat transfer capability of the finals.  That can be a fan, larger heatsinks, or both.  You should also rebias the two IRF510s.

Good Luck with the tests!
73
Evan
AC9TU


Bitx40 good receive, nobody hear me!

Simone Giugliani
 

Hi guys!
In this lockdown i'm finally made my bitx40 (buyed 2 years ago!!) operating.
Turned on with DL7PE MicroVert antenna (before i tried a trapped dipole) i had good signal receive.
I have tried to transmit but nobody can hear me. On hundred of online SDR services nobody receive my signal (voice or unbalanced CW tone).

This is a video that show my SWR meter:

https://www.youtube.com/watch?v=jnITFnaHJtI&feature=youtu.be

What can i do??
Thanks and 73, IU6KVT


Re: 80/40 power increase if possible

Evan Hand
 

Pete,
Forgot to mention that you will need to increase the heat transfer capability of the finals.  That can be a fan, larger heatsinks, or both.  You should also rebias the two IRF510s.

Good Luck with the tests!
73
Evan
AC9TU


Re: 80/40 power increase if possible

pete torrance <wayfound2000@...>
 

Thanks Evan. Yes I see it now on the diagram. How did I miss that!  Many thanks. Yes will certainly report back with the results.
73
Pete G4HAK

On Wednesday, 22 April 2020, 15:02:57 BST, Evan Hand <elhandjr@...> wrote:


Pete,

I do not have a v3, however I do have both a v4 and v5.  All three of the schematics and the two boards that I have used a 3 pin connector with Black, Brown, and Red wires.  The Black is common, the Red is for the mainboard, and the brown is for just the PA.    Simply separate the Brown wire and connect the higher voltage to it.  I would recommend that you keep the voltage to the mainboard at 12 volts, through a voltage regulator or separate power supply.

I hope this helps, and please let us know how it goes.

73
Evan
AC9TU


Re: Furlough 40 SSB Transceiver Project #homebrew

Dean Souleles
 

Don,

Thank you for the QSO and the recording of the audio!  Always happy to QSO with a Franken-uBitX or any other kind!

For folks that haven't followed - KM4UDX regularly tops the WSPR leader board with his uBitX - and I'm guessing his is the only uBitX on earth with an integrated cell phone charger.


73,
Dean


Re: Furlough 40 SSB Transceiver Project #homebrew

Dean Souleles
 

Farhan -

Thanks for the nice note.  Pete's circuits are better than fool proof - they are Dean-proof - and that is something special.

Dean


Re: 80/40 power increase if possible

Evan Hand
 

Pete,

I do not have a v3, however I do have both a v4 and v5.  All three of the schematics and the two boards that I have used a 3 pin connector with Black, Brown, and Red wires.  The Black is common, the Red is for the mainboard, and the brown is for just the PA.    Simply separate the Brown wire and connect the higher voltage to it.  I would recommend that you keep the voltage to the mainboard at 12 volts, through a voltage regulator or separate power supply.

I hope this helps, and please let us know how it goes.

73
Evan
AC9TU


80/40 power increase if possible

pete torrance <wayfound2000@...>
 

Hi 
Ubitx V3 here. I am only really interested in using 80 and 40m SSB and I am getting around 10W on 40 and 12W on 80. All fine and dandy but would like to increase this if possible. Ive seen loads of posts about increasing the PA voltage but am a bit confused about where the breaks should be to isolate the PA supply V ? Considering some of the other component change suggestions re: extra power out but find these days that my fumbly fingers don't match well with tiny components Verses soldering iron! Any expert advice would be really appreciated!
Have fun!
Pete G4HAK


Re: Furlough 40 SSB Transceiver Project #homebrew

Don - KM4UDX
 

Dean's lovely work hints at the artist within. FYI he is a accomplished photographer with a keen eye. His Furlough 40 has great lines and a hint of  elegance.

I'm humbled and thrilled to note my franken-uBITX's great honor as first substantive QSO with the Furlough 40. The audio was solid with easy copy. 

While the distance is not extraordinary, the accomplishment is. 

DIY to DIY, kit to kit, verve to verve. 

Well done Dean!

Don
Km4udx


Re: Furlough 40 SSB Transceiver Project #homebrew

MVS Sarma
 

Jack, his simpleceiver as a Rx is astonishingly fine. Please try during this time. Insread of 2 pcs of j310 forming dual gate, we can use bf998 and it simplifies . 
All thest please.

Sarma vu3zmv.

On Wed, 22 Apr 2020, 6:36 pm Jack, W8TEE via groups.io, <jjpurdum=yahoo.com@groups.io> wrote:
Totally agree. I'm a big fan of Pete Juliano, too, and follow his work as much as I can. He has an SDR project that he's working on that looks pretty neat! Man...wish I wasn't such a dunderhead when it comes to EE stuff, I really admire those who have that talent.

Jack, W8TEE



On Wednesday, April 22, 2020, 1:49:11 AM EDT, Ashhar Farhan <farhanbox@...> wrote:


Fabulous, Dean!
I like that you have split it up into blocks that you can snap out and replace with other blocks. Good stuff. Pete is a meticulous builder and his circuits are fail proof.
- f

On Wed 22 Apr, 2020, 6:42 AM Dean Souleles, <dsouleles@...> wrote:
Hi all -

Not a BITX but perhaps a cousin ...



This is a 100% homebrew project that I recommend form Pete, N6QW's SimpleSSB design.  Only 9 transistors across 9 modules.  This was my first ever transceiver project and only my second project ever - after a Michigan Mighty Mite 7 component crystal controlled CW transmitter than I made in half a day last December.  Here is the first transceiver demonstration of my "Furlough 40" 100% homebrew 40 meter transceiver.

If I can do it, you can too!


Here is the blog post with a video of the first QSO...

Furlough 40 First Rag Chew QSO

Cheers and 73,

Dean
KK4DAS


--
Jack, W8TEE


Re: Furlough 40 SSB Transceiver Project #homebrew

Jack, W8TEE
 

Totally agree. I'm a big fan of Pete Juliano, too, and follow his work as much as I can. He has an SDR project that he's working on that looks pretty neat! Man...wish I wasn't such a dunderhead when it comes to EE stuff, I really admire those who have that talent.

Jack, W8TEE



On Wednesday, April 22, 2020, 1:49:11 AM EDT, Ashhar Farhan <farhanbox@...> wrote:


Fabulous, Dean!
I like that you have split it up into blocks that you can snap out and replace with other blocks. Good stuff. Pete is a meticulous builder and his circuits are fail proof.
- f

On Wed 22 Apr, 2020, 6:42 AM Dean Souleles, <dsouleles@...> wrote:
Hi all -

Not a BITX but perhaps a cousin ...



This is a 100% homebrew project that I recommend form Pete, N6QW's SimpleSSB design.  Only 9 transistors across 9 modules.  This was my first ever transceiver project and only my second project ever - after a Michigan Mighty Mite 7 component crystal controlled CW transmitter than I made in half a day last December.  Here is the first transceiver demonstration of my "Furlough 40" 100% homebrew 40 meter transceiver.

If I can do it, you can too!


Here is the blog post with a video of the first QSO...

Furlough 40 First Rag Chew QSO

Cheers and 73,

Dean
KK4DAS


--
Jack, W8TEE


Re: Furlough 40 SSB Transceiver Project #homebrew

Ashhar Farhan
 

Fabulous, Dean!
I like that you have split it up into blocks that you can snap out and replace with other blocks. Good stuff. Pete is a meticulous builder and his circuits are fail proof.
- f


On Wed 22 Apr, 2020, 6:42 AM Dean Souleles, <dsouleles@...> wrote:
Hi all -

Not a BITX but perhaps a cousin ...



This is a 100% homebrew project that I recommend form Pete, N6QW's SimpleSSB design.  Only 9 transistors across 9 modules.  This was my first ever transceiver project and only my second project ever - after a Michigan Mighty Mite 7 component crystal controlled CW transmitter than I made in half a day last December.  Here is the first transceiver demonstration of my "Furlough 40" 100% homebrew 40 meter transceiver.

If I can do it, you can too!


Here is the blog post with a video of the first QSO...

Furlough 40 First Rag Chew QSO

Cheers and 73,

Dean
KK4DAS


Re: Furlough 40 SSB Transceiver Project #homebrew

Juan Carlos Berberena Gonzalez
 



On Tue, 21 Apr 2020 at 9:12 PM Dean Souleles <dsouleles@...> wrote:
Hi all -

Not a BITX but perhaps a cousin ...



This is a 100% homebrew project that I recommend form Pete, N6QW's SimpleSSB design.  Only 9 transistors across 9 modules.  This was my first ever transceiver project and only my second project ever - after a Michigan Mighty Mite 7 component crystal controlled CW transmitter than I made in half a day last December.  Here is the first transceiver demonstration of my "Furlough 40" 100% homebrew 40 meter transceiver.

If I can do it, you can too!


Here is the blog post with a video of the first QSO...

Furlough 40 First Rag Chew QSO

Cheers and 73,

Dean
KK4DAS

--
“If you have a penny and I have a penny and we exchange pennies, you still have one cent and I still have one cent.  But if you have an idea and I have an idea and we exchange ideas, you now have two ideas and I now have two ideas.” 

Mr. Juan Carlos Berberena Gonzalez, BSc.
WJ6C exCO6BG