Peter,
As long as you add a heatsink to the onboard regulator, it should be good.? Adding a 2 ohm 5 watt resistor in series with the input to the supply would remove 4.5 watts of dissipation from the regulator at full current, and still keep the input above minimum with a supply voltage of 11 volts.??With 13.8 volt supply, the regulator would need to dissipate 1.5 amps * (13.8 - 3 - 5) volts = 8.7 watts.
All of the above assumes that you are drawing the full 1.5 amps.? If a less current draw, the power dissipations go down for all devices.? It also assumes data as defined in an LM7805 from Texas Instruments in the Mouser catalog.
FWIW
73
Evan
AC9TU
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Re: Transmit Output Power (CW)
#v5
Thanks Barry, exactly the feedback I was looking for, I'll let you all know how I get on !!
Best regards, Peter.
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I have a 1.5A 7805 so in theory I should be able to replace the one on the raduino with this and have enough power for the 5" Nextion, shouldn't be a need to mount it on the rear panel ?
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Yes inkits.in is offline.?
Indian hams need to email us for any order.
Thanks
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Re: Ubitx v6.1 cat control
Look up VAC (Virtual Audio Cable).? There is a free version that allows output to both the speakers and the USB dongle that you would use to connect audio to the uBITX.? It acts like a Y cable in software.? I used it to connect WSJT-X to a Quisk that was linked to a Hermes Light 2 (HL2) SDR radio.?
Just an idea to try.
73
Evan
AC9TU
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Re: Ubitx v6.1 cat control
Question on ubitx audio via cat. This is going to sound stupid but how do you get audio out from the computer when running ft5 or wspr? I have messed with this and I can not get the computer to output sound from the radio. I am thinking that I need to put a Y? or splitter cable between the computer and radio ...then drive both a speaker and computer input at the same time. Barry
On Wed, Jul 1, 2020, 3:25 PM Michael Golden < pldnmayor@...> wrote:
Evan hand, success!!! Thank you, that worked like a charm!
Get
I'm running R1.5.0, and it works on WSJT-X no problem for me. Here's a screenshot of my settings:
![]()
I've also used R1.5.0 with fldigi. I've attached the XML file (FT-817.xml) to this message, and here's a screenshot of my settings:
![]()
Your COM ports may vary, but with these settings, I'm able to use both programs via CAT. Here's a short video of me demonstrating that I can control the radio from each program, as well as have changes on the radio reflected on the programs:
Reed
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Re: Transmit Output Power (CW)
#v5
Peter, I had to look at my notes on the two driver transistors as to why I did not change them. It was not because of extra heating it was because I was looking for a constant output on all bands or as close to constant output. Changing them to 11 ohms gave me much more output then what I was aiming for plus more heat on those devices.? So, yes change the driver and predriver emitter resistors to 11 ohms. You will need to put hats on those transistors as they will get hot... I have a homebrew amp that I drive with the ubitx and can not exceed 3 watts input. That is the reason I did not change those driver emitter resistors. Barry
Peter, I left the 22 ohm resistors in. I did not double up the smd emitter resistors for the two drivers. I changed the predriver emitter to 8.6 ohms.? Q90, I did not mess with. When I doubled up the emitter resistors for the two drivers, I had more heating on those devices and little gain in output. Your experience might be different but it is worth the effort, in my opinion, to change out those 3904 transistors.?
Thanks for the response Barry, much appreciated. I order some of ebay uk today, I got 5 for around 12 GBP so not too bad.
This definitely looks like a worthwhile mod on the v6, can you provide any more detail around exactly what you changed along with the removing the 3904 and dropping in the 2n5109. Did you change the resistor values in a similar manner to what was done for the 2n2222 swap ? Did you touch Q90 ?
The basic principal is to remove Q911 and replace Q912 and similarly remove Q92, Q97 and replace Q93, Q96, correct ?
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Re: Transmit Output Power (CW)
#v5
Peter, I left the 22 ohm resistors in. I did not double up the smd emitter resistors for the two drivers. I changed the predriver emitter to 8.6 ohms.? Q90, I did not mess with. When I doubled up the emitter resistors for the two drivers, I had more heating on those devices and little gain in output. Your experience might be different but it is worth the effort, in my opinion, to change out those 3904 transistors.?
Thanks for the response Barry, much appreciated. I order some of ebay uk today, I got 5 for around 12 GBP so not too bad.
This definitely looks like a worthwhile mod on the v6, can you provide any more detail around exactly what you changed along with the removing the 3904 and dropping in the 2n5109. Did you change the resistor values in a similar manner to what was done for the 2n2222 swap ? Did you touch Q90 ?
The basic principal is to remove Q911 and replace Q912 and similarly remove Q92, Q97 and replace Q93, Q96, correct ?
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Re: Transmit Output Power (CW)
#v5
Thanks for the response Barry, much appreciated. I order some of ebay uk today, I got 5 for around 12 GBP so not too bad.
This definitely looks like a worthwhile mod on the v6, can you provide any more detail around exactly what you changed along with the removing the 3904 and dropping in the 2n5109. Did you change the resistor values in a similar manner to what was done for the 2n2222 swap ? Did you touch Q90 ?
The basic principal is to remove Q911 and replace Q912 and similarly remove Q92, Q97 and replace Q93, Q96, correct ?
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It appears that the microphone that came with the kit does not work. R1 Value in the mic was .07mV. Should have been 1.8 V.
So now I have bought another Mic, it is a BETC but has 2 prong connectors. one for audio and the other for the Mic. see attached picture. Is there a connector/ adapter to make this work.
I have tried a splitter and the radio displays TX and the red LED is still not making contact with anyone.
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Hi Ted, can you share more details on your 5109 mod, I can mostly what you have done from the attached image but did you change any other components as well ?
What changes did you make to the resistors ?
Also did you change out the finals on this board to something else or is that just a repair ?
Thanks for your time!
Br Peter.
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Re: Transmit Output Power (CW)
#v5
Peter, yes I did! The 5109 give more power out on the upper bands but not more on 80, 40, 30 or 20. Off the top of my pointed head,? I would say about double the output power vs the stock 3904 devices. One thing I am going to do with my V6 is put a direct dc connection to the final mosfets and run those at 24 volts.? One thing I noticed from Mouser is in March I bought 5 of the 2N5109 transistors for around $3. Now they are not in stock. So not sure where to buy them from.
Barry. K3bo
Barry, did you install the 2n5109's yet ? Interested in this mod for my v6 and would love to know what improvement you see over the 2n2222a's.
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Re: Ubitx v6.1 cat control
Evan hand, success!!! Thank you, that worked like a charm!
Get
toggle quoted message
Show quoted text
I'm running R1.5.0, and it works on WSJT-X no problem for me. Here's a screenshot of my settings:
I've also used R1.5.0 with fldigi. I've attached the XML file (FT-817.xml) to this message, and here's a screenshot of my settings:
Your COM ports may vary, but with these settings, I'm able to use both programs via CAT. Here's a short video of me demonstrating that I can control the radio from each program, as well as have changes on the radio reflected on the programs: https://youtu.be/LkVwPr9ZumA
Reed
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Re: Transmit Output Power (CW)
#v5
Barry, did you install the 2n5109's yet ? Interested in this mod for my v6 and would love to know what improvement you see over the 2n2222a's.
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Ordered om 6/15/2020 and it got here 6/29/2020.?? Once it was shipped DHL it took 3 days.? They explained the shipping delay was that they ran out of knobs.? Corona-19 may have slowed their knob shipment.? I am delighted it is here.?? Maybe I should remove one wire from a control and solder it back on.?? That way I can brag that I soldered this great radio together.? LOL -- Lee - N9LO? "I Void Warranties"
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Hi Curt,
Thanks for the revert. I have tried to set the BFO to the best signal on 20m? but even then it is distorted.
There is also a 2Khan- ve shift.
I read on the forum a out a separate audio amp improving the audio quality. Hence thought about tinkering.
Some of the fellow hams in Mumbai which is my QTH also told me that the calibration also needs to be redone.
Am trying to locate a frequency counter to perform the 10mhz calibration my self.
Regard?
Rajesh VU3RHU
Rajesh
Do listen with headphones to see if audio is still very distorted.
These boards usually arrive with the BFO not properly adjusted. If the signal is coming too close or beyond the edge of the crystal filter passband this can cause significant distortion. Its the setting of the BFO that determines where the audio signal sits when it passes through the xtal filter.
A smaller thing, some of us modify the lm386 circuit for a better sound. This info is on the web. See la3za website,? but this is a minor aspect.
Check simple things before presuming its a circuit issue, it may not be.
Curt wb8yyy
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Sir, ? ? ?Your store at is offline? Please clarify.
On Wed, Jul 1, 2020 at 2:27 PM Sunil Lakhani < vu3sua@...> wrote: Hello Friends
We had promised a new kit for Bitx are ready now and available in limited numbers. The Easy Bitx kit is a mono bander kit which can be used for 20mt 40mt or 80mt band.
Te kit is sold as default for 20mt, but by changing the bandpass filters and low pass filters it can be used to 40mt or 80mt, also for any higher bands.
It can also be made into a multi bander by building low pass filter and band pass filters on separate boards just like the Bitx Multi band by Andy.
The manual can be downloaded from the link below.
We would suggest ?builders to study the manual.
The Kit has been made into 15 Steps, Each step has a individual kit packet.
The kit will be available complete with case,VFO BFO using si5351 build and working,agc.? The other option that will be available is just the Exciter Kit 'Easy Bitx' without VFO BFO and case.
The performance has been good as I am personally using the 20mt and 40mt Radios in my shack and have made few contacts dx as well as local.?
Some other hams are also using Easy Bitx in West Bengal in India.
We will be updating with any new developments wit the kit.
Our website.
Thanks and very best to the group members.
Once again thanks to all members for supporting us with the purchase of   kits and enclosures for bitx and ubitx.
Sunil Lakhani
vu3sua
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Looks pretty. Congrats.?
Sarma vu3zmv
On Wed, 1 Jul 2020, 2:27 pm Sunil Lakhani, < vu3sua@...> wrote: Hello Friends
We had promised a new kit for Bitx are ready now and available in limited numbers. The Easy Bitx kit is a mono bander kit which can be used for 20mt 40mt or 80mt band.
Te kit is sold as default for 20mt, but by changing the bandpass filters and low pass filters it can be used to 40mt or 80mt, also for any higher bands.
It can also be made into a multi bander by building low pass filter and band pass filters on separate boards just like the Bitx Multi band by Andy.
The manual can be downloaded from the link below.
We would suggest ?builders to study the manual.
The Kit has been made into 15 Steps, Each step has a individual kit packet.
The kit will be available complete with case,VFO BFO using si5351 build and working,agc.? The other option that will be available is just the Exciter Kit 'Easy Bitx' without VFO BFO and case.
The performance has been good as I am personally using the 20mt and 40mt Radios in my shack and have made few contacts dx as well as local.?
Some other hams are also using Easy Bitx in West Bengal in India.
We will be updating with any new developments wit the kit.
Our website.
Thanks and very best to the group members.
Once again thanks to all members for supporting us with the purchase of   kits and enclosures for bitx and ubitx.
Sunil Lakhani
vu3sua
|
Hello Friends We had promised a new kit for Bitx are ready now and available in limited numbers. The Easy Bitx kit is a mono bander kit which can be used for 20mt 40mt or 80mt band. Te kit is sold as default for 20mt, but by changing the bandpass filters and low pass filters it can be used to 40mt or 80mt, also for any higher bands. It can also be made into a multi bander by building low pass filter and band pass filters on separate boards just like the Bitx Multi band by Andy. The manual can be downloaded from the link below. We would suggest ?builders to study the manual. The Kit has been made into 15 Steps, Each step has a individual kit packet. The kit will be available complete with case,VFO BFO using si5351 build and working,agc. ?The other option that will be available is just the Exciter Kit 'Easy Bitx' without VFO BFO and case. The performance has been good as I am personally using the 20mt and 40mt Radios in my shack and have made few contacts dx as well as local.? Some other hams are also using Easy Bitx in West Bengal in India. We will be updating with any new developments wit the kit. Our website. Thanks and very best to the group members. Once again thanks to all members for supporting us with the purchase of   kits and enclosures for bitx and ubitx. Sunil Lakhani vu3sua
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Sunil Lakhani
Lee
rajesh huddar