My 40 with stock 10k pot works and I have several Q's. I get about 200 KHz tuning.
When I substitute the 10 turn 10k Bourne pot I get only 2 KHz tuning. Both pots measure 0-10 Ohms. I have tried various wiring combinations but am stumped.
72, Bob KI0G
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Guess we'll just have to wait for the Hammy's. --
Ryan Flowers KC7RYS?
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Thanks Gents! I actually got some on the Facebook group. If I didn't, I was just going to buy 10 and then replace the volume pot with a standard 1/4" knurled shafted pot and wire in a separate power switch.? -- Ryan Flowers KC7RYS?
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Oh yea , did we forgot the word ....Modest....
On Fri, Feb 17, 2017 at 9:56 AM, Ashhar Farhan <farhanbox@...> wrote: Guys,
Stop please. It is embarrassing. I wanted this as badly as you all did. I bought three myself. i haven't had the time yet.. I want to listen to the Oscars with it. it should be easy to tweak it with a different band pass and a BFR92 in place of the front end rf amp...
On 17 Feb 2017 8:15 p.m., "Richard Andrew Knack via Groups.Io" <ihc73scout2= yahoo.com@groups.io> wrote: Yes, thank you very much Mr. Farhan! I miss the old days of Heathkit and Ten Tec selling reasonably priced (and not so reasonably priced) kits for ham radio equipment. Kits for HF transceivers, except the rock-bound Chinese QRP CW kits, tend to be very expensive for the most part, especially on a factory worker's wages (at least where I live). While I already have a couple of operational HF transceivers, I am once again experiencing the joy that comes from a "do-it-yourself" project. Keep up the good work!
Rich KC8MWG
On Friday, February 17, 2017 9:24 AM, Baruch Atta <baruchatta@...> wrote:
Ashhar Yes, thanks for the kit and for the valuable lessons in electronics.? I saw first hand the effects of the changes that I made (mostly to the VFO). ? ?I wouldn't try this on a "big rig" for fear of royally screwing up.? But I am dedicated to getting the BITX working the way I want.? Many happy hours of puttering around with the board. ? I wonder if there is a Ham Radio Karma ? ? TNX 73, JOE W3TTT ?
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Guys,
Stop please. It is embarrassing. I wanted this as badly as you all did. I bought three myself. i haven't had the time yet.. I want to listen to the Oscars with it. it should be easy to tweak it with a different band pass and a BFR92 in place of the front end rf amp...
On 17 Feb 2017 8:15 p.m., "Richard Andrew Knack via Groups.Io" <ihc73scout2= [email protected]> wrote:
Yes, thank you very much Mr. Farhan! I miss the old days of Heathkit and Ten Tec selling reasonably priced (and not so reasonably priced) kits for ham radio equipment. Kits for HF transceivers, except the rock-bound Chinese QRP CW kits, tend to be very expensive for the most part, especially on a factory worker's wages (at least where I live). While I already have a couple of operational HF transceivers, I am once again experiencing the joy that comes from a "do-it-yourself" project. Keep up the good work!
Rich KC8MWG
On Friday, February 17, 2017 9:24 AM, Baruch Atta <baruchatta@...> wrote:
Ashhar Yes, thanks for the kit and for the valuable lessons in electronics.? I saw first hand the effects of the changes that I made (mostly to the VFO). ? ?I wouldn't try this on a "big rig" for fear of royally screwing up.? But I am dedicated to getting the BITX working the way I want.? Many happy hours of puttering around with the board. ? I wonder if there is a Ham Radio Karma ? ? TNX 73, JOE W3TTT ?
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Yes, thank you very much Mr. Farhan! I miss the old days of Heathkit and Ten Tec selling reasonably priced (and not so reasonably priced) kits for ham radio equipment. Kits for HF transceivers, except the rock-bound Chinese QRP CW kits, tend to be very expensive for the most part, especially on a factory worker's wages (at least where I live). While I already have a couple of operational HF transceivers, I am once again experiencing the joy that comes from a "do-it-yourself" project. Keep up the good work!
Rich KC8MWG
On Friday, February 17, 2017 9:24 AM, Baruch Atta <baruchatta@...> wrote:
Ashhar Yes, thanks for the kit and for the valuable lessons in electronics.? I saw first hand the effects of the changes that I made (mostly to the VFO). ? ?I wouldn't try this on a "big rig" for fear of royally screwing up.? But I am dedicated to getting the BITX working the way I want.? Many happy hours of puttering around with the board. ? I wonder if there is a Ham Radio Karma ? ? TNX 73, JOE W3TTT ?
On Thu, Feb 16, 2017 at 7:08 AM, Ed Vignati <kj4fgi@...> wrote: I just want to say thank you, you made a kit affordable to everyone. You undertook the design, giving woman work by winding toroids and other parts of the kit. You took your own personal time to not only design the radio you had to design the board, spend your time trying to find a manufacturer to mass produce the boards at an affordable price. Organize the workforce to assemble and pack the kits, checking each board before it goes out. Spent your personal time that could be spent with your family to think of us , and I copy and pasted your quote: ?to encourage people all over the world to get more active in amateur radio, analog electronics and self-learning. Building and modifying radios is a great education. Lack of access to elmers and and radio builders' community, absence of test equipment : all impede the spread of homebrewing. With the BITX40, we hope to recover that ground and encourage more and more people to get on air, modify, experiment, build and learn. So, go head, make that mod you wanted to.
We all know that you are not making a profit especially when
shipping is included. ?So, I just want to say Thank You!
I also know there are a lot of Hams that are saying Thank
You
Look at the activity in this group, a lot of Happy Hams!
Thank you and God Bless,
and from all of the Ham Radio Community to you, a Big Thank You!
????????????????????????
Eddie ¨C kj4fgi
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Ashhar Yes, thanks for the kit and for the valuable lessons in electronics.? I saw first hand the effects of the changes that I made (mostly to the VFO). ? ?I wouldn't try this on a "big rig" for fear of royally screwing up.? But I am dedicated to getting the BITX working the way I want.? Many happy hours of puttering around with the board. ? I wonder if there is a Ham Radio Karma ? ? TNX 73, JOE W3TTT ?
On Thu, Feb 16, 2017 at 7:08 AM, Ed Vignati <kj4fgi@...> wrote: I just want to say thank you, you made a kit affordable to everyone. You undertook the design, giving woman work by winding toroids and other parts of the kit. You took your own personal time to not only design the radio you had to design the board, spend your time trying to find a manufacturer to mass produce the boards at an affordable price. Organize the workforce to assemble and pack the kits, checking each board before it goes out. Spent your personal time that could be spent with your family to think of us , and I copy and pasted your quote: ?to encourage people all over the world to get more active in amateur radio, analog electronics and self-learning. Building and modifying radios is a great education. Lack of access to elmers and and radio builders' community, absence of test equipment : all impede the spread of homebrewing. With the BITX40, we hope to recover that ground and encourage more and more people to get on air, modify, experiment, build and learn. So, go head, make that mod you wanted to.
We all know that you are not making a profit especially when
shipping is included. ?So, I just want to say Thank You!
I also know there are a lot of Hams that are saying Thank
You
Look at the activity in this group, a lot of Happy Hams!
Thank you and God Bless,
and from all of the Ham Radio Community to you, a Big Thank You!
????????????????????????
Eddie ¨C kj4fgi
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Do you have access to a 3D printer at all?
If so, check this out (it's what I used):
On Friday, February 17, 2017 7:23 AM, Raj vu2zap <vu2zap@...> wrote:
How about these!
At 17-02-2017, you wrote:
>Does anyone in the US have a couple of spare knobs? I need one for a 1/4" knurled shaft and one for the 1/8"/4mm shaft volume/switch that comes with the BITX. Looking for the attached style if possible. Just trying to avoid having to buy 10 of each on ebay lol. Have Paypal to pay. Thanks!
>
>--
>Ryan Flowers KC7RYS
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How about these!
toggle quoted message
Show quoted text
At 17-02-2017, you wrote: Does anyone in the US have a couple of spare knobs? I need one for a 1/4" knurled shaft and one for the 1/8"/4mm shaft volume/switch that comes with the BITX. Looking for the attached style if possible. Just trying to avoid having to buy 10 of each on ebay lol. Have Paypal to pay. Thanks!
--
Ryan Flowers KC7RYS
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Ion,
I know that weed is legal in Canada but if you guys made a battery that
eats weed, hats off!
At 17-02-2017, you wrote:
My portable setup, the way I
want to implement it, will use a 20V weed eater battery.
...
73,
Ion
VA3NOI
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Ion
VA3NOI
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Hi Ryan! I¡®ve bought knobs from Tayda Electronics. I also changed the volume pot with one that has a regular, 025" dia shaft, without switch. I use a DPDT ON-OFF-ON switch to turn ON/OFF and switch the power to the PA from 12V to 20V. You can buy the knobs you like from Digikey. Delivery in 24 hours. 73
--
Ion VA3NOI
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Hi Rob,
Yes I agree, the value stored in the eeprom should be retrieved by setup() and used before the main loop runs, the calibration only needs to be done once unless changes over write the locations in the eeprom used by the calibration routine.
I still like having a lock button as on my FT817.
Have fun hacking
73 Alf vk2yac
G4NQX wrote:
toggle quoted message
Show quoted text
'Lock' I don't see why this is necessary. On powerup all values are read from 'startup' function first, no matter where it is in the code order. The 'do tuning' function runs after that in the 'loop'. It just needed the eeprom call in 'setup' to get the calibration factor value first.
That's what I said in my first post, it was a puzzle how anyone got it to work as it was.
Putting it into calibration suspends the 'do tuning' etc. functions and goes into a dedicated calibration loop where the final value is saved to eeprom on release of calibration pin/button/wire. Then it returns to the main 'loop'. On power up again, the value would be retrieved if the call is there. If you run calibration after that again, it resets the calibration value first then enters the calibration loop.
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Rob G4NQX
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My portable setup, the way I want to implement it, will use a 20V weed eater battery.
Inside the package there are 5 LiPo cells. They have 4Ah capacity. I will use three cells to feed the power input and all 5 for PA power.
A DPDT ON-OFF-ON switch will do the power ON job.
One position 12V to both power inputs, one for increased voltage at the PA power input. Middle position OFF.
I think this will give me at least 5 - 6 hours of SSB operation.
73,
Ion
VA3NOI
-- Ion VA3NOI
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New Hacks from ND6T on BITXHACKS
Don ND6T has been sending us some great BITX Hacks.??I'm posting them all to the BITXHACS blog: ???? Check?them out.? More to come.? 73? Bill ?N2CQR
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Does anyone in the US have a couple of spare knobs? I need one for a 1/4" knurled shaft and one for the 1/8"/4mm shaft volume/switch that comes with the BITX. Looking for the attached style if possible. Just trying to avoid having to buy 10 of each on ebay lol. Have Paypal to pay. Thanks!
--
Ryan Flowers KC7RYS?
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'Lock' ? I don't see why this is necessary.? On powerup all values are read from 'startup' function first, no matter where it is in the code order.? The 'do tuning' function runs after that in the 'loop'. It just needed the eeprom call in 'setup' to get the calibration factor value first. That's what I said in my first post, it was a puzzle how anyone got it to work as it was.
Putting it into calibration suspends the 'do tuning'? etc. functions and goes into a dedicated calibration loop where the final value is saved to eeprom on release of calibration pin/button/wire. Then it returns to the main 'loop'. On power up again, the value would be retrieved if the call is there.? If you run calibration after that again, it resets the calibration value first then enters the calibration loop.
--
Rob G4NQX
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Ion, Obviously, my brain is not working.? I blame the flu and meds I am on. That is a great idea.
Time to do some part shopping...
Marco - KG5PRT?
On Feb 16, 2017 9:48 PM, "Ion Petroianu" < ion.petroianu@...> wrote: Hi Marco! Once you have everything adjusted I don't think you will need current protection anymore, except for cases when your antenna fails. If you start operating at 12V you will be able to save your PA FET until you tune the antenna. After the antenna tuner is adjusted you can switch the voltage at PA input for higher power. My proposal was for the bench/desk setup and tuning, when it is much more likely to kill the FET.
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Ion VA3NOI
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Hi Marco! Once you have everything adjusted I don't think you will need current protection anymore, except for cases when your antenna fails. If you start operating at 12V you will be able to save your PA FET until you tune the antenna. After the antenna tuner is adjusted you can switch the voltage at PA input for higher power. My proposal was for the bench/desk setup and tuning, when it is much more likely to kill the FET.
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Ion VA3NOI
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John, Thank you for the link! Now to scan through here and see what juicy morsels I find...
Marco - KG5PRT?
On Feb 16, 2017 5:55 PM, "John Backo via Groups.Io" <iam74= [email protected]> wrote: Good idea, Marco.
Yeah, the 2SC1969, 2SC7025 and many others will work well. But these are BJT's which
are very different animals than MOSFETS,
There a multitude of examples available for a dual output AB amplifier out there.
You must build it on a separate board and feed it via R136. You will probably have
to use a phase splitter and dual drivers. You will probably have to control driver
bias voltage with diodes sensing finals temperature.
Start with Harry's website. He has an extremely good introduction to this type
of amplifier.
Understand that this is another realm to conquer. It may make your BITX
easier to use but it will require entering new places with new RF territory.
There is an alternative which starts with the WA2EBY amplifier. That's the font
for practically all variants of the MOSFET amplifiers now out there, including
the BITX40.
john
AD5YE
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Raj vu2zap
Ion Petroianu, VA3NOI