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Wobbling voice in Transmit
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Dear OM, My bitx40 voice is wobbling during transmit. I am using DDS VFO from OM Farhan.? My understanding DDS frequency shall be extremely stable. It looks like frequency slightly varying during voice modulation. I have no idea how it is happening. Is there someone who can help me to give some clue leading to the solution.? Awaiting some clues.? 73ees VU2JON? John? |
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Jon:? What are you using for the power supply??? 73? Bill N2CQR On Saturday, June 24, 2017 12:40 PM, John T P <tpjohn@...> wrote: Dear OM,
My bitx40 voice is wobbling during transmit. I am using DDS VFO from OM Farhan.? My understanding DDS frequency shall be extremely stable. It looks like frequency slightly varying during voice modulation. I have no idea how it is happening. Is there someone who can help me to give some clue leading to the solution.? Awaiting some clues.? 73ees VU2JON? John? |
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I am using regulated power supply 13.5V, stable to 0.1V. I baught it just two months ago. Hence I believe it is latest version. It is showing version 1.01 during start up. 73ees? VU2JON? John? On Jun 24, 2017 10:28 PM, "Bill Meara via Groups.Io" <n2cqr=[email protected]> wrote:
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v1.01 is the original stock version.
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Try to upgrade to Aurduino-v1.15.1, download it from It has VFO disabled during TX to prevent FM-ing (and many other extra features) See also the WIKI at /g/BITX20/wiki/Raduino-Topics for Arduino related instructions. 73 Allard PE1NWL On Sat, June 24, 2017 20:49, John T P wrote:
I am using regulated power supply 13.5V, stable to 0.1V. |
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thanks a lot.? But I don't have enough know how to upgrade software.? Is there any other methods to make it stable?? How the FM ing is happening? Is it from voltage?? 73ees? VU2JON? John? On Jun 25, 2017 12:26 AM, "Allard PE1NWL" <pe1nwl@...> wrote: v1.01 is the original stock version. |
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Dale Brooks KG7SSB
If the final transistor IRF510 is using the same power supply as the transceiver it would be possible for the power supply voltage to fluctuate (on the board end) because of the heavy current the final is pulling when modulated. The problem I see with this device is the small wire that feeds the power to the radio and worse yet the final. I would think you would want to use a much larger gauge wire to help prevent voltage variations caused by fluctuating current draw. I have monitored my radio using another receiver and I'm not seeing a large amount of FM-ing taking place. I have however been told that my signal was FM-ing while using a 50 watt linear amp. But I have narrowed it down to the linear amp and not the transceiver. I'm still working on this and have not finalized the project.? You might try measuring the voltage on the board-end and see if the voltage is moving around while modulating. If you do you may just have a loose connection for your ground or hot lead. Just recheck your connections for bad solder or plug connections. Good luck and have fun with this amazing radio. Dale 73's |
¿ªÔÆÌåÓýJohn,It may sound intimidating but learning to re-program the raduino is essential. Many improvements and you will want to be able to use them. Here is a link for a previous discussion. I can't seem to find the other one I had.? See how far you can get and then come ask questions, with the helpful folks here you'll be programming that raduino soon. /g/BITX20/message/22618 Jonathan - KK6RPX On 6/24/2017 12:11 PM, John T P wrote:
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Did you solder the .1mfd cap to the 10k tuning pot On Jun 24, 2017 12:40 PM, "John T P" <tpjohn@...> wrote:
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Do you have the 0.1u cap across the tuning pot? - f On Sun, Jun 25, 2017 at 8:26 AM, David Woodward <kf4wbj2@...> wrote:
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John P
On Sat, Jun 24, 2017 at 12:11 pm, John T P wrote:
But I don't have enough know how to upgrade software.?It's really not that hard to figure out.?Others have pointed to some tutorials that will tell you how. Basically it's as simple as downloading the software, the IDE and connecting the Arduino to a USB port. ? -- John - WA2FZW |
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FWIW, within the past week or so someone posted to group that they were also getting reports of frequency variations during transmit and it
turns out that they had neglected to install the disk capacitor between the wiper and ground on the tuning pot. Installing the cap fixed the? issue for them.? Cheers Michael VE3WMB? |
Allard PE1NWL
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