Hi, ? Can You remove this email adres: ludoschoofs@... ? With the transition to from Yahoo to Groups.io I changed an adres. This, the old one, ?kept receiving mails. ? Thanks, ? Regards ? Ludo ON7JW ?
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Van: [email protected] [mailto:[email protected]] Namens Richie Chambless
Verzonden: donderdag 17 mei 2018 15:47
Aan: [email protected]
Onderwerp: Re: [BITX20] Using IRF530 outputs and 2N3553 drivers in ubitx ? I have used the Minipa 70 in my scratch built BitX. While I can get 70 Watts out (13.8v supply), it is short lived as a final will blow within a few seconds and short closed. 50 Watts will work for short QSOs, but taking for more than four or five seconds will destroy the IRF530s. My heat sink is 6¡±x4¡± with 2¡± fins, so I don¡¯t think heat dissipation is the issue. 25 Watts gives me no issues, however.?
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Re: share your BITX success stories
I haven't had a chance transmit other than CW mode into a dummy load. I want to finish my antenna analyzer before I start pumping rf into my Carolina Windom. Reception was very good but noisy with all the weather here in Florida at this time. Lightning is a major concern as my antenna is almost as high as my natural lightning rods, pine trees 60 - 90 feet tall. As a QCWA member I enjoy CW as my primary mode but really have enjoyed WSPR with my U3S. I see alot of digital in my future. 73 Bill WA8VIH/4
On Thu, May 17, 2018 at 05:03 am, Daniel Conklin wrote:
then the Indy Speedway F1 race day station
My very first contact with my BITX40, first HF contact at all for that matter, was with W9IMS.? I'm not a race fan but they had a good strong signal and I got through.? I don't collect paper but I made a quick QSL card on card stock just so I could get theirs to commemorate it.
?
--
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Re: Newbie instructions for loading software in Raduino
#firmware
The Raduino is a combination of two things.? The chip and circuit that generates the frequencies, and a Arduino Nano.? You can unpower the uBITX and plug the mini USB plug into the Arduino nano unit on the Raduino board to power it up and program it.? In other words, forget about it being a Raduino board and just think of it as the Arduino.? Look around on Youtube for lots of info on programming the Arduino nano.
I actually blew the nano board on my ubitx and replaced the nano board with one of them off ebay that sells for about $ 3.? You can get one of those and play with the software so you will not mess up the one in the ubitx.? I have just gotten into playing with the Arduino in the last 6 months or so.??
The kd8cec program and his memory manager is very nice.? ?I modified mine to use the 6 push buttons to make it more convenient to operate.?
73 de ku4pt
On Thu, May 17, 2018 at 9:30 AM, kj6etl <pa1zz@...> wrote: I am finding instructions mentioning compiling etc. I visited the KD8CEC website and I am confused with the instructions given.
Is the Raduino the same as the Arduino so I can use the help recourses available for that platform?
Where can I find help for dummies showing step by step where exactly what to do without assuming one knows the fist steps?
Thank you!
Rogier
_
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Re: Using IRF530 outputs and 2N3553 drivers in ubitx
I have used the Minipa 70 in my scratch built BitX. While I can get 70 Watts out (13.8v supply), it is short lived as a final will blow within a few seconds and short closed. 50 Watts will work for short QSOs, but taking for more than four or five seconds will destroy the IRF530s. My heat sink is 6¡±x4¡± with 2¡± fins, so I don¡¯t think heat dissipation is the issue. 25 Watts gives me no issues, however.?
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Re: Newbie instructions for loading software in Raduino
#firmware
Rogier,
Go to
and download the KD8CEC manual. It has step-by-step
instructions.
Regards,
Rod KM6SN
On 05/17/2018 06:30 AM, kj6etl wrote:
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I am finding
instructions mentioning compiling etc. I visited the KD8CEC
website and I am confused with the instructions given.
Is the Raduino the same as the Arduino so I can use the help
recourses available for that platform?
Where can I find help for dummies showing step by step where
exactly what to do without assuming one knows the fist steps?
Thank you!
Rogier
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Re: share your BITX success stories
On Thu, May 17, 2018 at 05:03 am, Daniel Conklin wrote:
then the Indy Speedway F1 race day station
My very first contact with my BITX40, first HF contact at all for that matter, was with W9IMS.? I'm not a race fan but they had a good strong signal and I got through.? I don't collect paper but I made a quick QSL card on card stock just so I could get theirs to commemorate it. ? --
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Just a couple of days left in our "Name the Board" contest.
About three dozen entries in hand.
Entries due by 2359 UTC on May 20 2018
Only entries sent to "jrg.qrv (at) gmail (dot) com" will be considered.
Information about the new board and the contest can be found at <>
Prototypes are due in three or four days. But here's an attached image with just a "teensy" peek at the feline hiding in the sack....
Our working name was "RadI2Ceensy" [ RAD eee too SEEN see] but that's a bit like branding your jams and jellies "Smuckers" and hoping folks will like them LOL
Good Luck...
N5IB
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Newbie instructions for loading software in Raduino
#firmware
I am finding instructions mentioning compiling etc. I visited the KD8CEC website and I am confused with the instructions given.
Is the Raduino the same as the Arduino so I can use the help recourses available for that platform?
Where can I find help for dummies showing step by step where exactly what to do without assuming one knows the fist steps?
Thank you!
Rogier
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I want to make a substitute Raduino using a "Blue Pill" STM32F103 board. Does anyone know where I can get a quick start on the CAD by finding an Eagle or KiCAD file set that already has the critical connector dimensions on it?
Joe
W3JDR
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Re: Mic doesn't work in bitx40
#bitx40
The mic may be bad or connected reverse polarity.. pay attention to that!
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At 17-05-18, you wrote: Hello everyone..
I have some problem with my mic pre-amp.. The voltage from 4.7KOhm resistor suddenly drop to 0.130-0.132Volt after I connect it to the mic electret..
Is this normal?
I've put my oscilloscope on the 1uF capacitor to observe the change of the frequency, but it doesn't even display any change when I said or scream in front of the mic. What could be the problem?
Need help here..
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Re: Mic doesn't work in bitx40
#bitx40
Are you using an electret condenser mic ?
If you connect a dynamic mic then what you describe is correct. The design is for electrets.
Raj
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At 17-05-18, you wrote: Hello everyone..
I have some problem with my mic pre-amp.. The voltage from 4.7KOhm resistor suddenly drop to 0.130-0.132Volt after I connect it to the mic electret..
Is this normal?
I've put my oscilloscope on the 1uF capacitor to observe the change of the frequency, but it doesn't even display any change when I said or scream in front of the mic. What could be the problem?
Need help here..
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Re: Core for Output Transformer
Bill, are you still using the IRF510¡¯s and if so how many turns for the primary and secondary windings? While experimenting last night I noticed that T11 was heating up and power out would drop somewhat.?
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On May 16, 2018, at 22:03, K9HZ < bill@...> wrote:
Actually I just tried/ wound a BN61-002 and it seems to be the winner so far.? Doesn¡¯t heat up at full power and is extremely wide banded¡
?
?
Dr. William J. Schmidt - K9HZ
?
?
From: [email protected] [mailto:[email protected]] On Behalf Of Nick VK4PLN
Sent: Wednesday, May 16, 2018 8:09 PM
To: [email protected]
Subject: Re: [BITX20] Core for Output Transformer
?
THanks GLen.
I was about to suggest using dual bn43-202 for the output and power feeding... should be easy enough to fit in the existing board...
Wonder if it will be better to do this or a bifilar wound 10T FT50-43 for feeding in the power?
73 Nick VK4PLN
?
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Re: Using IRF530 outputs and 2N3553 drivers in ubitx
The BFU590 is a current device?with similar specs.?
--
Karl Heinz - K5KHK
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Re: share your BITX success stories
I agree too!? I have been making contacts with special events stations and DX on 40 meters SSB.? My first contact was the Marconi Birthday Memorial station in Cape Cod, then the Indy Speedway F1 race day station.? Since I sole my FT=817 two years ago I've only been using CW with home built QRP transmitters, so it's a real treat to be able to make some voice contacts with a radio that I may not have designed and built, but at least I assembled it.??
- Dan , W2DLC
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Re: Mic doesn't work in bitx40
#bitx40
Are you using the mic element that came with the UBITX? If you are did you wire it up correctly, there is a positive/audio pin and a negative/ground pin connected to the case of the element. You can see the case/pin connection with a magnifying glass on some elements it is only a small trace that can be measured with your ohm meter.?
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On May 17, 2018, at 05:46, qonita.salimah@... wrote: Hello everyone..
I have some problem with my mic pre-amp.. The voltage from 4.7KOhm resistor suddenly drop to 0.130-0.132Volt after I connect it to the mic electret..?
Is this normal?
I've put my oscilloscope on the 1uF capacitor to observe the change of the frequency, but it doesn't even display any change when I said or scream in front of the mic. What could be the problem?
Need help here..
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Nice info, but i fear same device if bought from ebay could well be a fake "wx" device (tda2822)
On Thu, May 17, 2018 at 4:57 PM, alans77 via Groups.Io <alans77@...> wrote: An unexpected bonus from using the NJM2037 is a significant reduction in receive audio distortion. Highly recommended.?
Alan N4AYE
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An unexpected bonus from using the NJM2037 is a significant reduction in receive audio distortion. Highly recommended.?
Alan N4AYE
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Re: share your BITX success stories
I am having a ball with mine, I get around 10 watts on 80 and 40 meters. I am making contacts up to around 700 miles from a fan dipole at 35 feet (10 meters or so). I am putting the finishing touches on my enclosure, a re-purposed Cobra 148 CB case, and am enjoying the whole experience. I am going to attempt to do Howard's mods for leveling out the power on the upper bands and add the necessary cabling for digital.
I have also uploaded the KD8CEC firmware, and must say it is a pleasure to use. Thanks to Ian for his hard work!
73 de WS4JM
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Happy!!!
I replaced the diode and it works again???
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Re: Using IRF530 outputs and 2N3553 drivers in ubitx
They come up as obsolete
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On Wed, May 16, 2018 at 07:54 pm, Rahul Srivastava wrote:
Hi!
?
I feel we should give BFG591 a try, they are modern devices , easily available with online suppliers and more compatible with the SMD construction of uBitx. There is plenty of headroom where Ft is concerned will work on 6 and yes I have seen it being used as driver in some designs.
?
73
?
Rahul VU3WJM??
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kj6etl
Raj vu2zap
Skip Davis
Jay - WS4JM