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Re: GPS corrected Arduino controlled VFO
Adi Ramesh
Sent from Yahoo Mail on Android
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Re: bitx output harmonics
use what you have. if it blows up. write about it. - f On Sun, Feb 19, 2017 at 12:01 PM, John Smith via Groups.Io <johnlinux77@...> wrote:
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Re: Calibration : Bitx40
Hi Ross,
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Please test, lets know how you go. 73 Alf vk2yac bellrossjr@... wrote:
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New file uploaded to [email protected]
[email protected] Notification
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. File: raduino.ino Uploaded By: Alf Edwards Description: You can access this file at the URL: Cheers, |
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New file uploaded to [email protected]
[email protected] Notification
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. File: raduino.ino.eightanaloginputs.hex Uploaded By: Alf Edwards Description: You can access this file at the URL: Cheers, |
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New file uploaded to [email protected]
[email protected] Notification
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. File: raduino.ino.with_bootloader.eightanaloginputs.hex Uploaded By: Alf Edwards Description: You can access this file at the URL: Cheers, |
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Re: Calibration : Bitx40
Hi Ashhar,
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I have not used GitHub before, I will register and try to upload. Thank you Alf vk2yac Ashhar Farhan wrote: Alf, |
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Re: Calibration : Bitx40
Alf, If you could push your code to GitHub, i can pull it. - f On 19 Feb 2017 7:20 a.m., "alf" <fpdbase@...> wrote: Hi all, |
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Re: BITX40
I don't think I could put up with the freq jumping around like that, should have a bit of hysterisis in raduino code. ?So you have to reverse direction 2 or 3 clicks before anything happens. ?Somebody in a recent post found that putting the supplied 0.1uf cap on the raduino pins instead of at the tuning pot on the other end of the wires made it behave somewhat better. ?I might eventually go to the shuttle tuning scheme described by Don Cantrell here: ? On Sat, Feb 18, 2017 at 06:07 pm, John Smith wrote:
Mine did this too. When the frequency readout is flicking back and forth there is a corresponding click. When the readout is not flicking a quieter clicking sound can still be heard until I keep fiddling with the knob to get the freq steady, then it's all quiet. It's like the clock generator is changing frequency in small enough amounts that it doesn't change the display. But then after changing the tuning poteniometer for a smaller one with a knurled shaft, it doesn't do that anymore. The freq still flicks back and forth like it did before, but no more quiet clicking. I just did this for a more convenient knob choice. ?I also noticed before, that when it does that quiet clicking, my transmitted signal would also waver back and forth in freq while I monitored with a receiver. ? |
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Re: compressor or processor for BITX40?
Allard, your final amplifier is not being driven enough. You have low transmit power. If you have followed the wire up process by inserting your amp meter in the PA positive brown wire and it read 100mA but not 1Amp when you spoke into the mic, then you need to adjust R136. It's a flat silver trimmer on the same side of the board as the PA. Adjust it counter clockwise to increase your drive until speaking into the mic with a long aahhh gets you 1 Amp on your meter. If your meter doesn't show 100mA first, then you need to adjust RV1 blue trimmer counter clockwise until you do get the 100mA the adjust R136 to get 1Amp. This really does need to be included in the wire up notes. It could have saved me a whole dang month Farhan! Not to mention the diode I needlessly removed while desperately trying any possible solution to the low TX power problem. At least you changed the red vs. brown calibration wire kills the raduino thing. I'm still bitter! Sorry Allard, just read the first paragraph. |
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Re: BITX40
I suggest you check out Ashhar's video on debugging the Bitx40 receiver, posted here on Dec 25, 2016: ? ?? ? He takes a few feet of wire connected to nothing, uses that as an antenna to inject RF noise from the local environment into the various receiver stages, listening to the result coming out of the Bitx40 speaker. Often times the transformer wires get broken or shorted during transport, check them closely. ?There are occasional cold solder joints, look closely with bright lights and good magnification. On Sat, Feb 18, 2017 at 05:36 pm, Mark Underkofler wrote:
I don't think this unit has a BFO problem since it really doesn't pick up much at all. ?I really think the front end of the receiver is way out of wack. ?Attaching the antenna tonight made little difference in the background noise. ? ? |
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Re: BITX40
Mine did this too. When the frequency readout is flicking back and forth there is a corresponding click. When the readout is not flicking a quieter clicking sound can still be heard until I keep fiddling with the knob to get the freq steady, then it's all quiet. It's like the clock generator is changing frequency in small enough amounts that it doesn't change the display. But then after changing the tuning poteniometer for a smaller one with a knurled shaft, it doesn't do that anymore. The freq still flicks back and forth like it did before, but no more quiet clicking. I just did this for a more convenient knob choice. ?I also noticed before, that when it does that quiet clicking, my transmitted signal would also waver back and forth in freq while I monitored with a receiver.
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