Hi Colleagues
The best for all of you and yours families.
Here my own ?PCB version of the Synthesizer.
Finally I found a little mistake but easy to fix it.
More information here
Qrv's ,73's Jc
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Re: Step by step raduino software install instructions
The chip is made by a Chinese company.? That's why their webpage is in Chinese.
You can translate the page.
73, Bob, WB4SON
the web page given by bob comes up in a funny language . Jap or chinese
terry gm4dso
_._,_._,_
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Re: BITX QSO Night, Sunday, May 28, 9pm Local Time, 7.277 MHz
W1LY with varying strength from 5-5 to 5-9, later in the hour was better than the first half.
I thought I heard someone else calling CQ but could not get the call sign, WA1LAV?
Some broadcast QSB on 7277.?
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Re: Source of LDR required.
Phil,
You might already have the answers, but regardless, here's my blog post and vid on this circuit:
FWIW, the first LDR I used from the junk box was 40-400k and did not work. ?I sourced a 4-40k LDR from Jaycar (here in VK) and it worked fine. I didn't even bother to tape it for ambient light penetration. ?Day or night on the bench seemed to make no discernible difference. ?
73 VK3HN
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Re: I find the Transmit audio is a bit muffled has anyone else found this?
Okay. After reading Peter's explanation, I actually understand. While tweaking the trimmer cap, I can tell there is also a difference in audio signal strength smack in the middle of high to low pitch adjustment. I can hear the difference with this alignment between the BFO crystal and the crystal BP filter as monitored with a WebSDR site. Muffled audio signal in the BITX40 was one of the first problems I ever noticed. I have been waiting a long time for parts to make an amplified electret mic circuit, and don't think I need that anymore.?
Since so many people have had the same complaint, why wasn't the trimmer still on the board? It seems necessary. My board has been needing that adjustment for about 5 months now. I have really got to stop putting these things off.
Thank you for the explanation and the fix Peter. Just in time for BITX40 QSO Night.
If the guy putting things in the wiki is still doing that. Grab his post and put it in there.
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Re: I find the Transmit audio is a bit muffled has anyone else found this?
I didn't see Peter Parker's post until after my second post.
Cheers.
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Re: I find the Transmit audio is a bit muffled has anyone else found this?
I am familiar with #define bfo_freq (11998000UL). But this hardware hack acts exactly like the calibration mode in the wire up directions. I used a trimmer instead of ceramics because Peter said he was too lazy to get to the under side of the board. My board is held on by adhesive backed plastic PC board posts. I can pop it off and on anytime without hassle. So it's the same hack, but with ideal hardware.
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Re: I find the Transmit audio is a bit muffled has anyone else found this?
John Smith write
>I just now performed the Peter Parker improved audio hack with a 10 - 40pf trimmer cap and observed the following.
>Before soldering it on I set it for approx 27pf, and heard a noticeable higher pitched static when I turned it on.
>I tuned in a QSO? and adjusted for optimum tonal quality. This was looking familiar.
>I loaded an WebSDR page and transmitted while adjusting the trimmer cap. I could hear my voice pitch go up
>and down like I was tuning the frequency around. Then I realized how this was looking familiar. It was providing
>the same results as calibrating the frequency offset. The band is currently dead, and I can't tell how much my
>calibrated offset has changed with this BFO tuning hack right now.?Does this make sense to anyone?
>Is this another way of doing the same thing with the calibration function?
The short answer is no. ?While there is interaction between the carrier oscillator frequency (which this mod changes) and the calibration or offset setting in the DDS VFO but they are very different adjustments.?
It is essential to get the relationship between the BFO crystal and the crystal filter bandpass right. ?This ensures punchy audio that's readable when the signal is weak. And people won't be saying your audio is muffled, thin or they have difficulty tuning you in. ?The carrier oscillator setting determines the tx and rx audio bandpass and is more complex than simply being on or off frequency. Set it for optimum transmitted audio and ignore that the frequency display is different on the rig you're aligning and your test receiver. ?The setting that is right for tx audio should also be right for rx audio as the carrier oscillator/BFO and xtal filter are shared.?
Once happy with the audio audio bandpass characteristics you can adjust the offset setting in the DDS to match the BFO frequency so your display lines up with other stations. ?You can usually tell this without any special measuring since most stations on 7 MHz operate on exact multiples of 1kHz. So if all stations are tuned in well when tuning in 1 kHz steps with your DDS you should be right.?
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Re: I find the Transmit audio is a bit muffled has anyone else found this?
when you made that mods you have changed your BFO-Freq, if you look inside the Raduino schetch you fin this line
?#define bfo_freq (11998000UL)
if you find a counter you will have the right Freq for that line
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Re: I find the Transmit audio is a bit muffled has anyone else found this?
I just now performed the Peter Parker improved audio hack with a 10 - 40pf trimmer cap and observed the following. Before soldering it on I set it for approx 27pf, and heard a noticeable higher pitched static when I turned it on. I tuned in a QSO? and adjusted for optimum tonal quality. This was looking familiar. I loaded an WebSDR page and transmitted while adjusting the trimmer cap. I could hear my voice pitch go up and down like I was tuning the frequency around. Then I realized how this was looking familiar. It was providing the same results as calibrating the frequency offset. The band is currently dead, and I can't tell how much my calibrated offset has changed with this BFO tuning hack right now.
Does this make sense to anyone? Is this another way of doing the same thing with the calibration function?
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Re: Baofeng microphone mod for BITX
It showing you where the push to talk connections are which is basically the grounds of both mic and speaker connections that are connected together when you press the push to talk. So yeah basically pressing the push to talk will combine the mic ground and speaker ground. I am not sure if that will cause conflict in the radio.?
Sent from my iPhone
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On May 28, 2017, at 5:09 AM, DJ4MU < pbepler@...> wrote: Despite the posted diagram i'm still not sure how to wire up the unmodified Baofeng mic to the Bitx.
the speaker connections seem obvious, with ground on the sleeve of 2.5mm and other speaker connection to tip.
the mic + connection seems fairly obvious too , on the ring of the 3.5mm.
But where are the mic - and PTT wires from the Bitx connected, and do they all use the same ground?
Which Bitx wire connects to the tip of the 3.5mm (v+) ?
<Bao_plug_Bitx.jpg>
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You connected the leads for the powersupply of the amplifier stage. I made this mistake initially.
Ron - PA3FAT
Sent from my iPhone
On 28 May 2017, at 21:59, Joe Puma < kd2nfc@...> wrote:
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Find a websdr openwebrx close to you to see if you're getting out.?
Sent from my iPhone
On May 26, 2017, at 8:56 PM, Brian D. K2BRZ < kd2iog@...> wrote:
Yup, fixed the continuity problem on the coax jumper and still no reading on the SWR Bridge. The only other thing I can think of is that the unit is bad. Should the meter itself light up, does anyone know? I don't see anything that it should. I have an
HT I can use to check but that is VHF, not HF.
How else can I verify if the radio has been damaged? No smoke has been let out and only minimal fiddling inside while doing mods, which I was sure to be careful with. Being that there isn't a signal going into the bridge, I am surmising the antenna probably
isn't a problem for now. I don't have a dummy load to bias the radio, so I'm not sure if the very small fiddling I did with that may have done something.
73,
Brian, K2BRZ
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got there before me. CH340 drivers may work. I have FT232 UARTs
in my Nano's
On 28/05/17 20:49, OZ9AEW wrote:
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I expect you are going to use Arduino Ide for a
Raduino-board !
then you have to find and install a driver for Ch340 % CH341 chip
used in many clear Arduino Nano from China
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You can also do a crew test by testing the AC out on the coacts line. ?Set your multi meter to high-voltage key up the mic and talk.?
Sent from my iPhone
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On May 26, 2017, at 9:21 PM, Brian D. K2BRZ < kd2iog@...> wrote: Yes, which is why I'm thinking it's the radio because nothing happens on the SWR bridge when I key the mic. Either that or the unit is defective.
My question is: How do I verify it is the radio with the problem?
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Find a websdr openwebrx close to you to see if you're getting out.?
Sent from my iPhone
toggle quoted message
Show quoted text
On May 26, 2017, at 8:56 PM, Brian D. K2BRZ < kd2iog@...> wrote: Yup, fixed the continuity problem on the coax jumper and still no reading on the SWR Bridge. The only other thing I can think of is that the unit is bad. Should the meter itself light up, does anyone know? I don't see anything that it should. I have an HT I can use to check but that is VHF, not HF.
How else can I verify if the radio has been damaged? No smoke has been let out and only minimal fiddling inside while doing mods, which I was sure to be careful with. Being that there isn't a signal going into the bridge, I am surmising the antenna probably isn't a problem for now. I don't have a dummy load to bias the radio, so I'm not sure if the very small fiddling I did with that may have done something.
73,
Brian, K2BRZ
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I expect you are going to use Arduino Ide for a Raduino-board !
then you have to find and install a driver for Ch340 % CH341 chip used in many clear Arduino Nano from China
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hi if i follow the steps for compiling and uploading for windows 7 ide all goes ok until i try tools/ports.
it only offers me com1 and com2 NOT usb
the upload obviously fails
terry gm4dso
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Re: I find the Transmit audio is a bit muffled has anyone else found this?
Thanks to the group for this thread, I just installed a 15-60 pf trimmer at C103 and adjusted for crisp receive audio and the transmit audio sounds great now!
Hoping for some contacts tonight on the 9PM get together around 7.277!
Kevin N8DLP
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Re: source for AD9850 DDS module for W8TEE TFT/VFO?
Doug,
I actually
received the "Right" AD98590 module pictured in the listing from these two Ebay
sellers:
?
http://www.ebay.com/itm/172381520736
?
http://www.ebay.com/itm/180956144662
?
On the
other hand, based on my? experience
I? would not make a purchase from
this seller:
suntekstore
?
73 &
Happy BITXing
Bob? N0BHC
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Re: BITX QSO Night, Sunday, May 28, 9pm Local Time, 7.277 MHz
My observation might be a confounding two cents, but here it goes. I don't hear the kilowatters other nights. We might be the QRMers stepping on their established nets or whatever. I think another night as well as other frequencies should be considered.
I plan to participate again tonight. de KG5KYJ, John, Oklahoma City.
I'll be working 7.178, 7.277, 7.285, as needed.?
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JuanCarlos Berberena Gonzalez
Bob
VK3HN