Many have used the tone-into-the-mike scheme and gotten it to work, it has been the most popular method of getting CW into a BitX for over a decade. ?But?I do think Allard's scheme is superior. ?No residual carrier or opposite sideband to worry about, no issues with trying to get a pure sine wave from oscillator through mike amp and modulator without distortion. Take a good hard look at Allard's instructions before deciding it is too difficult. ?There is a 10k resistor from Raduino to C107 for the "CW CARRIER wiring" that replaces the entire tone generator board. ?The sidetone and ptt ?and tx/rx hacks that Allard describes would remain about the same if using the tone generator board. ?
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On Wed, Jun 7, 2017 at 09:40 am, <terryhugheskirkcudbright@...> wrote:
hi
i am reluctant to solder bits to my bitx40 board cos all the connections are on sockets and also i am not happy poking around smd components.
i am there thinking of the cw board from sunil which produced a tone to feed into the mike as well as a side tone.
has any body produced cw by inserting a tone into the mike socket.
terry
?
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Re: Tuning potentiometer too long to be fitted
Thank tou guys? i used this and worked great 
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Re: Tuning potentiometer too long to be fitted
I used the little shaft on supplied Volume control by drilling
out an Al spacer (1/4') and crazy glued it to the smaller
nylon pot shaft.? Works great.? I wanted the switch on the pot to
save panel space.
Mike, WA6ISP
On 6/7/2017 9:35 AM,
terryhugheskirkcudbright via Groups.Io wrote:
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hi
i could not find a knob to fit the supplied pot so i used one from
my junk box which has a serrated shaft
terry
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Re: IRF510- Temporary replacement?
The IRF510 gets plenty hot, a BS170 will likely blow in this circuit. ?Wear eye protection. ?T7 converts the 50 ohms to 12.5 ohms at the IRF510, you might go without T7 is using a relatively wimpy FET, and maybe power the PA from 6v instead of 12v. ?A BS170 requires less drive, so cut back on R136. ?Other big TO220 enhancement mode NFET's might be a better choice, they likely won't blow, ?just not give much output due to the order of magnitude increase in gate capacitance. ?I have my doubts, it's hard enough to get an RF amp to behave with thorough analysis.. ?
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On Tue, Jun 6, 2017 at 07:54 pm, Ryan Flowers wrote:
Looks like the Drain and Gate are reversed, but that's easy enough to resolve. Shall I just solder it in and give it a try? Or will I need to change R136 and/or RV1? Thanks a lot. This is a learning experience for me for sure :)
?
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Get to above 15 to prevent deciphering the dits/dahs.
Currently still struggling to get beyond this. Even when I did my cw exam about 30years ago.
?
G4FON program is a good solution to get this done. Uses Koch method. You learn the sound instead of dits/dahs.
Unless you can copy don¡¯t touch the key/paddle.
Ron ¨C PA3FAT
?
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Van: [email protected] [mailto: [email protected]] Namens
terryhugheskirkcudbright via Groups.Io
Verzonden: 7 June, 2017 18:34
Aan: [email protected]
Onderwerp: [BITX20] cw speed
?
hi all
i am trying to learn cw but can only read at 10wpm at the moment. i use aldo.
are any of you cw wallers out there happy to work at 10 wpm . just to get me started
terry gm4dso
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hi
i am reluctant to solder bits to my bitx40 board cos all the connections are on sockets and also i am not happy poking around smd components.
i am there thinking of the cw board from sunil which produced a tone to feed into the mike as well as a side tone.
has any body produced cw by inserting a tone into the mike socket.
terry
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Re: Calling West Coast BITX operators
WA6ARA, Ridgecrest, CA -- Mike Herr WA6ARA DM-15dp Home of The QRP Ranch No trees were killed in the sending of this message, however, a large number of electrons were terribly inconvenienced.
"Dad says that anyone who can't use a slide rule is a cultural
illiterate and should not be allowed to vote. Mine is a beauty - a
K&E 20-inch Log-log Duplex Decitrig." - Robert Heinlein
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Re: Tuning potentiometer too long to be fitted
hi
i could not find a knob to fit the supplied pot so i used one from my junk box which has a serrated shaft
terry
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Re: Allard's Version 1.113
Hi David,
good to hear that v1.14 works ok with you know.
Perhaps you should upgrade your IDE to the latest version 1.8.2
73, Allard PE1NWL
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On Wed, June 7, 2017 18:23, bigdswitzer wrote: That is v1.13.
"Sketch uses 30,936 bytes (100%) of program space. Maximum is 30,720
bytes.??
Global variables use 1526 bytes (74%) of dynamic memory, leaving 522 bytes
for local variables. Maximum is 2048 bytes."
Just compiled v1.14 and that compiles nicely, no problem.
Using IDE v1.6.9
David KG7WFM
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hi all
i am trying to learn cw but can only read at 10wpm at the moment. i use aldo.
are any of you cw wallers out there happy to work at 10 wpm . just to get me started
terry gm4dso
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Re: Allard's Version 1.113
That is v1.13.
"Sketch uses 30,936 bytes (100%) of program space. Maximum is 30,720 bytes.?
Global variables use 1526 bytes (74%) of dynamic memory, leaving 522 bytes
for local variables. Maximum is 2048 bytes."
Just compiled v1.14 and that compiles nicely, no problem.
Using IDE v1.6.9
David KG7WFM
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Re: Raduino_v1.14 released
Should work fine, and not a bad idea.
If you can't find 100k, could use a 10k pot between ground and the Arduino 5v digital CW transmit output, center wiper of pot goes on out to the 10k series fixed resistor that you already have.
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On Wed, Jun 7, 2017 at 08:46 am, Al Duncan VE3RRD wrote:
I was just thinking about the comment on using the CW TX mode during antenna tuner adjustment and having to limit the key-down time. Previously you had used a 47K series resistor in the circuit to unbalance the modulator, this was reduced to 10K because the output power was low for many Bitx40 boards. A DPDT tune switch could be used, one half of which would insert an additional resistor in series with the 10K to Raduino D6 to reduce output power to 1 or 2W while the other half of the switch would key up the transmitter in CW mode. Possibly a trim-pot of a large enough value (100K ?) could be used for the additional resistor so the tune power could be set to the desired output power level.
I haven't tried it yet, but does this sound like it would work?
73, AL VE3RRD
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Re: Tuning potentiometer too long to be fitted
I used a Dremel with a cutting wheel.? Worked perfectly.
--
Darren, W9ZIM
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Re: Raduino_v1.14 released
I was just thinking about the comment on using the CW TX mode during antenna tuner adjustment and having to limit the key-down time. Previously you had used a 47K series resistor in the circuit to unbalance the modulator, this was reduced to 10K because the output power was low for many Bitx40 boards. A DPDT tune switch could be used, one half of which would insert an additional resistor in series with the 10K to Raduino D6 to reduce output power to 1 or 2W while the other half of the switch would key up the transmitter in CW mode. Possibly a trim-pot of a large enough value (100K ?) could be used for the additional resistor so the tune power could be set to the desired output power level.
I haven't tried it yet, but does this sound like it would work?
73, AL VE3RRD
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Re: Raduino error to solve
Jack,
Thanks !!
Toni, IV3XHM
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Re: Calling West Coast BITX operators
Charlie K?TAN Lake Havasu City, AZ
More a lurker. I have a Raduino, but not a BITX yet.?
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Re: Struggling with tuning clicks and birdie sounds
If the BitX is not connected to an antenna, tuning clicks are very noticeable. When connected to a 40m antenna they,for all practical purposes, disappear. Willy W1LY?
On Wed, Jun 7, 2017 at 7:39 AM, Allard PE1NWL <pe1nwl@...> wrote: It seems there is a huge variability between various BITX40 radios, and
there are various points where improvements may help.
In my particular case, I achieved the greatest tuning click reduction just
by using shielded wires to and from the volume potentiometer.
73 Allard PE1NWL
wOn Wed, June 7, 2017 12:07, DJ4MU wrote:
> I already have the 100nF across wiper -ground? on both sides of the Tuning
> Pot connection,
>
> as well as the? 56ohm and bypass capacitor 1000uF and 100nF in the feed
> line of the Raduino 5v regulator as suggested in various posts.
>
> so you suggest those noises still come from power supply line of Raduino?
>
> can that be measured with oscilloscope??
>
> 73
>
> Philipp DJ4MU
>
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Re: Tuning potentiometer too long to be fitted
Remember to hold the pot shaft end (the part your cutting off) in the vise, NOT the body of the pot.
You don't want to put that kind of pressure on the pot.
Mike, WA6ISP
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On 6/7/2017 6:42 AM, Vince Vielhaber wrote: So will a pneumatic cut-off tool!
A hacksaw will fix that problem.
Vince.
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Re: Baofeng microphone mod for BITX
So if you have 4 wires how do you put that to a 3 pin male jack?
do you share mic and ptt ground wires? Is this gonna work?
thank you
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I'd certainly fix D7 and C130, could still be the problem. ?But having it suddenly work when a meter is added from gate to ground suggests the 820k at R1 in the FLDIGI PTT circuit is not doing its job. ?Is it soldered in properly? ?Is it really 820k or less? ?Try a 100k resistor instead of (or in parallel with) the 820k.
I have an issue with mechanical relays, for low power levels a conservative design with semiconductors is usually cheaper and more reliable. ?I'm currently thinking hard about how to cheaply do T/R switching of the antenna at 50W or less without relays. ?All the other relays of the Bitx40 are easily done away with.
Jerry, KE7ER
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On Wed, Jun 7, 2017 at 07:00 am, Mike KM4VKR wrote:
That sounds like a good theory. I was aware of the issue with D7 and C130 and thought that might be the problem. It seems like the problem doesn't occur when I have the meter attached. At this point I'm just going to modify the circuit so that it actuates a relay. Thanks for the help.
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Allard PE1NWL
W9ZIM
Willy