Replacing VFO with Raduino - BITX40
Before I begin can someone give advice on the correct procedure. Which components do you remove on the main board etc etc....? Regards and many TNX - Noel VK2CAO
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Re: Yet Another set of BitX40 Project Enclosure Template CAD files
Hello Dave,
I have not found the Kenwood-style connector, do you have an
"address" ?
Thanks
On 30/04/2017 00:14, David Fannin
wrote:
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For making my ?BitX40 enclosure, I created a set of templates
that were inspired by VU2XE's CAD templates.?
Since I was experimenting with a number of different options,
including the box size and different style of openings, I
created a python program that would generate the DXF CAD files,
based on my desired configuration settings, with more or less
automatic resizing if the dimensions changed. ? ? The DXF files
can be opened by any suitable CAD program (I used LibreCAD on
Ubuntu), and can be modified and exported as needed. ?
I've uploaded the python program and created files to a github
repository (
) so others can download and create their own. ?There is also as
generated set of DXF and PDF files from the current program
settings. ? The python program uses the dxfwrite library, which
can be installed using pip. ?
I used the Kenwood-style 2 pin Mic/PTT/Speaker connector, which
works very well for a compact design. ?Just remember to make
sure the 3.5mm jack is not grounded to the case, as this would
active the PTT switch. ?I also used the anderson polepower
connectors on the back. ?The enclosure is made from two 12"x12"
sheets of ?5052 aluminum 0.040" thickness.?
Dave KK6DF
  
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Re: Output Power is less than 3W
what are you using to supply power what is the current draw when transmitting. Have you looked on the wire-up section of to make sure everything is biased correctly.? Let's save a hundred questions and please tell us what steps you as the builder have taken to identify or troubleshoot the problem.
On Wed, May 3, 2017 at 11:43 AM, <unnikrish7997@...> wrote: tried with ?a dummy load. thus got the output power
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Re: Output Power is less than 3W
Dear Unni,
Please check IRF510 is drawing more than 1A current, when you speak to the mic. You said already the drive is at Max. Also when you don't speak around 180mA. You can adjust gate bias pot to get 180mA.
Perhaps you can reach upto 5W output maximum.
73ees
On Wed, May 3, 2017 at 9:03 PM, <unnikrish7997@...> wrote: hello dear people, My output power of my BitX 40 is less than 3W while checking an SWR meter. I preset to control volume is set to its maximum. One of my friend have the same problem. Waiting for the answers. regards? Unni Krishnan?
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Dear OM Farhan,
Bitx RX works very good. Only issue when strong signals coming there is no way to attenuate it. I suggest to add a pot, Voltage controlled power supply to RX side of RF Amp(Q1) & IF AMP(Q2) by using a 10K lin pot. I think that should able to reduce the front end gain for strong signals very easily at low cost and effort.
Regards
VU2JON
JOHN T.P. Tharayil House
Sree Ayyappa Road Kuriachira Thrissur-680 006? Mobile: +91-960-5000-445 / 88-07-007-933
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Re: Output Power is less than 3W
tried with ?a dummy load. thus got the output power
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Re: Output Power is less than 3W
Same problem with me also RFvoltage at base of pre ?driver transistor 200 mv in defective board where us working one 500 mv .
On May 3, 2017 9:06 PM, "Steve Greer" < km4ous@...> wrote: Let's start with the basics.? Power supply voltage and amperage.? Type of antenna?? Have you tried into a 50 ohm dummy load?? All hams should have one.? Check into a dummy load and report back.
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Re: Output Power is less than 3W
Let's start with the basics.? Power supply voltage and amperage.? Type of antenna?? Have you tried into a 50 ohm dummy load?? All hams should have one.? Check into a dummy load and report back.
On Wed, May 3, 2017 at 11:33 AM, <unnikrish7997@...> wrote: hello dear people, My output power of my BitX 40 is less than 3W while checking an SWR meter. I preset to control volume is set to its maximum. One of my friend have the same problem. Waiting for the answers. regards? Unni Krishnan?
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Re: Output Power is less than 3W
Please read preset to control voltage.?
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Output Power is less than 3W
hello dear people, My output power of my BitX 40 is less than 3W while checking an SWR meter. I preset to control volume is set to its maximum. One of my friend have the same problem. Waiting for the answers. regards? Unni Krishnan?
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Re: Baofeng microphone mod for BITX
I tried using the baofeng electret mic, jumping leads to go right to the consensor so the ptt and mic dont share the same ground and if i whistle into the mic it puts power out but not while talking.
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Re: Book by Jack and C Questions
Hi Roy:
That's sincerely appreciated, Roy, but not necessary. Instead, give an extra dollar to your favorite charity, or the next time you're at a bar, buy a drink and raise a toast to K&R and Farhan. And trust me, I'm getting far more out of this than I'm putting in...this is really fun stuff to me!
Jack, W8TEE
From: Roy Appleton <twelveoclockhigh@...>
To: [email protected]
Sent: Wednesday, May 3, 2017 8:39 AM
Subject: Re: [BITX20] Book by Jack and C Questions
Jack, for those people that may have a copy of your book and would like to make a direct contribution to you for your unrealized financial benefits, do you have a PayPal account we contribute to? I'm serious. :-)) Roy
WA0YMH
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Re: BITX QSO Night, Sunday, May 7, 9pm Local Time, 7.179 MHz
I agree that we should try to use the best time for propagation.? However noise levels and propagation vary so much, the best strategy for QRP is always going to be jump in when conditions are good. Let's see if the QSO night becomes popular, if so, we might add local sunset to the schedule. Are the best conditions just after sunset?? From watching my WSPR beacon, I was spotted by stations to the east before dark, then later in the evening had long distance spots to the west.
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Re: Book by Jack and C Questions
Jack's Book
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On 5/3/2017 5:47 AM, walter berkley wrote: Could anyone mentioning a book ...PLEASE provide the name of the book...it would be very helpful !
Thank you walt
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Re: BITX QSO Night, Sunday, May 7, 9pm Local Time, 7.179 MHz
I think this is a great idea, and I intend to give it a try now and then. But being a QRP activity, we might want to reach for the maximum advantage. Selecting a time near dusk in every time zone would add Greyline enhancement to the activity. My suggestion would be to try calling at local sundown, what ever the season might be. That 9 PM time will be good later this spring, but where I am located dusk is about 7:30 PM (CDT) right now. Speaking as a JT Op with WAS on several bands, when I picked up Alaska and Hawaii on 80-20m was just as the terminator crossed the stations at those locations (usually in November or December). Thats also when I got JA, VK, and ZL.
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Re: Book by Jack and C Questions
Could anyone mentioning a book ...PLEASE provide the name of the book...it would be very helpful !
? ? ? Thank you ? ? ? ?walt
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Jack, for those people that may have a copy of your book and would like to make a direct contribution to you for your unrealized financial benefits, do you have a PayPal account we contribute to? I'm serious. :-))
Roy
WA0YMH
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Re: Book by Jack and C Questions
Jack, for those people that may have a copy of your book and would like to make a direct contribution to you for your unrealized financial benefits, do you have a PayPal account we contribute to? I'm serious. :-)) Roy
WA0YMH
On May 2, 2017 9:47 PM, "Jack Purdum via Groups.Io" <econjack= [email protected]> wrote: Michael:
First, thanks for buying the book. I know there are a ton of illegal sites out there where you can download it for free.?
Second, since you have gone through the trouble of buying it, please read it from page 1 to the end...don't skip around. I have some different ways of teaching programming and touch on things like lvalues, rvalues, symbol tables, memory management and some other stuff that is usually considered a tad bit strange for an intro book. However, I've taught C since the early 1980's and I know what works and what doesn't work...for most people. The result is that I've developed some strange teaching stuff, like the Right-Left Rule, The Bucket Analogy, The Five Programming Steps, the N - 1 Rule, and some others, but they work. If you can stick with me through the first four chapters, some often scary stuff (e.g., pointers) becomes duck's soup because you've been properly prepared for it. When you're done, let me know what you think...good or bad.?
As to being "over your head"...nonsense! Anyone who is smart enough to get a radio license is more than smart enough to learn how to program. Enjoy the trip!
Jack, W8TEE
From: Michael Hagen <motdog@...>
To: [email protected]
Sent: Tuesday, May 2, 2017 5:23 PM
Subject: Re: [BITX20] Book by Jack and C Questions
Thanks for you and Jacks help on this.? I am convinced it is over my head.
I? saw these suffix items added to a numeric the first time in my old
life making a Si5351 Generator.? I just don't know why.
I have not seen it in other programming in the past.? So I just made
sure my variables were big (UL).? I just put the numbers in without SUFFIX?
So since I have ALWAYS seen a variable introduced with a type in front
of it, I was really perplexed about what seems redundant info added.
I realize breaking the rules for a variable such as you mentioned? (left
= right) would be problems.
I always define the variable with a type.? I understand if you get away
without it, probably some type of INT will be assigned by the compiler?
I guess I would have to know what the compiler did special when it sees
these on the end of a number.
I also assume the programmer always knows what his type is so as not to
cause errors.
Too bad I am retired and old, I would be working somewhere making money
and my brain would not be strained so much.
I would not have time to get so confused!
Thanks,
Can't wait for Jack's book!? Amazon FREE Shipping!
Mike, WA6ISP
On 5/2/2017 1:52 PM, Mark Pilant wrote:
> Hi Mike.
>
> > "unsigned long bfo_freq = 11998000UL;"
>
> Now for some compiler stuff :-)
>
> Compilers "generally" (dangerous word) have a "left side" and "right
> side"
> for an assignment ("=") statement.? As such, constants such as
> 11998000 can
> present a problem.
>
> Does is get promoted if the left side has a smaller allocation than the
> right side?? Such as a 16-bit unsigned int being assigned with the value
> 4912 which is the 32-bit value (0xB71330) truncated to 16-bits (0x1330).
> Going to a larger allocation is not usually an issue as nothing gets
> truncated.
>
> In an effort to make this unambiguous and perfectly clear to the
> programmer
> as well as the compiler, it is usually considered good practice to add
> the
> appropriate suffix to a constant value.? Most often, it it only on large
> constants, but you will sometimes see a coding standard which
> specifies the
> appropriate suffix to be added to any constant value.
>
> And what Jack said :-)? (Especially with signed / unsigned.)
>
> 73
>
> - Mark? N1VQW
>
>
>
>
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Great, certainly better than nothing! I cringe every time I take my KX2
outside and it might rain... Hopefully I will be able to write the code
to drive the DDS module from the keypad...
Gil F4WBY.
peatmoss - ki6ssi wrote:
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Same here, I'm putting the bitx in a Outdoor products waterproof box
with o ring. When you flip open the lid the panel has all connectors,
lcd and knobs facing up. This way it will be 100% waterproof when
closed. The drawback is its not waterproof when operating. I plan to use
it backpacking and if its raining I'll use it from inside the tent.
--
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Hello,
I have found that document whiles ago describing how turining hte bitx20 to ¨¤ 40m band usage. 73! Jeremy F4HKA
On Wed, May 3, 2017 at 8:44 AM, John Backo via Groups.Io <iam74@...> wrote: Sorry, guys.
The above calculation for the 20m rig assumes the same IF. If they are different,
the L value must be calculated for the new VFO coverage,
using? f^2? = 25330/ LC where f is in MHz, L in uH, and C in pF.
The same general considerations apply.
john
AD5YE
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Re: BITX QSO Night, Sunday, May 7, 9pm Local Time, 7.179 MHz
This sounds like a fun event. I?ll try to remember to give it a try.? Chris WS5B
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Soundararajan Ra.
Bob KV4PC
Chris Viningre