开云体育

BITX-40

4Z1NT All Messages By This Member #47233 Has anybody have the experience of the BITX 40 [no mods yet made] deciding to go into calibration mode on its own? If so how did you fix it? Menashe 4Z1NT
Raj vu2zap Member Profile All Messages By This Member #47241 Check the voltage on the wire and if it is 5V then bypass with a 0.1 to remove noise or RF influence and see. Do all soldering with power OFF ! Raj toggle quoted message Show quoted text At 25-04-18, you wrote: Has anybody have the experience of the BITX 40 [no mods yet made] deciding to go into calibration mode on its own? If so how did you fix it? Menashe
_Dave_ AD0B All Messages By This Member #47244 There is an article on the hfsignals page on calibrating the bitx40. It seems like when the red wire goes to ground it goes into calibration mode. Did the red wire touch the chassis or board.
Allard PE1NWL All Messages By This Member #47249 Calibration mode is normally only entered when the red wire is connected to ground. Make sure the red wire does not touch ground. Noise on the red wire?(due to poor ground connections, poor SWR, poor power supply, etc.) may also cause the Raduino to jump into calibration mode. 73 Allard PE1NWL
4Z1NT All Messages By This Member #47307 Which wire are we talking about? Menashe toggle quoted message Show quoted text On 25 April 2018 at 15:57, Raj vu2zap <rajendrakumargg@...> wrote: Check the voltage on the wire and if it is 5V then bypass with a 0.1 to remove noise or RF influence and see. Do all soldering with power OFF ! Raj At 25-04-18, you wrote: >Has anybody have the experience of the BITX 40 [no mods yet made] deciding to go into calibration mode on its own? > >If so how did you fix it? > >Menashe
Jerry Gaffke All Messages By This Member #47308 Near the bottom of this webpage: ? ?? under "Calibrating the Raduino" it says ? ?? Attach a switch between the RED wire of the the 8-pin Raduino connector and the ground. So we get the Bitx40 into calibrate mode by grounding the normally unused red wire that is two positions over from the yellow tuning pot wire. If that wire is not grounded, then a 30k resistor internal to the Nano's processor chip should pull that wire up to 5v. Raj suggests that you measure the voltage on that wire, see if it really is 5v as it should be during normal operation. If it is 5v, there is still a possibility that it is picking up a radio frequency signal that your voltmeter does not see, and that this RF signal is causing the rig to go into calibrate mode. The cap he suggests would bypass that radio frequency signal. If you do not measure 5v on that wire, I suggest you add a 1k resistor from that wire to the 5 volts from the 7805 regulator. Jerry, KE7ER toggle quoted message Show quoted text On Wed, Apr 25, 2018 at 09:57 pm, 4Z1NT wrote: Which wire are we talking about? ? Menashe ? . . . ? On 25 April 2018 at 15:57, Raj vu2zap <rajendrakumargg@...> wrote: Check the voltage on the wire and if it is 5V then bypass with a 0.1 to remove noise or RF influence and see. Do all soldering with power OFF ! Raj At 25-04-18, you wrote: >Has anybody have the experience of the BITX 40 [no mods yet made] deciding to go into calibration mode on its own? > >If so how did you fix it? > >Menashe
Raj vu2zap Member Profile All Messages By This Member #47311 Thanks for the patient explanation for Menashe. I was presuming that he knew about calibration. Raj At 26-04-18, you wrote: toggle quoted message Show quoted text Near the bottom of this webpage: ??? under "Calibrating the Raduino" it says ???? Attach a switch between the RED wire of the the 8-pin Raduino connector and the ground. So we get the Bitx40 into calibrate mode by grounding the normally unused red wire that is two positions over from the yellow tuning pot wire. If that wire is not grounded, then a 30k resistor internal to the Nano's processor chip should pull that wire up to 5v. Raj suggests that you measure the voltage on that wire, see if it really is 5v as it should be during normal operation. If it is 5v, there is still a possibility that it is picking up a radio frequency signal that your voltmeter does not see, and that this RF signal is causing the rig to go into calibrate mode. The cap he suggests would bypass that radio frequency signal. If you do not measure 5v on that wire, I suggest you add a 1k resistor from that wire to the 5 volts from the 7805 regulator. Jerry, KE7ER On Wed, Apr 25, 2018 at 09:57 pm, 4Z1NT wrote: Which wire are we talking about? ? Menashe ? . . . ? On 25 April 2018 at 15:57, Raj vu2zap <rajendrakumargg@...> wrote: Check the voltage on the wire and if it is 5V then bypass with a 0.1 to remove noise or RF influence and see. Do all soldering with power OFF ! Raj At 25-04-18, you wrote: >Has anybody have the experience of the BITX 40 [no mods yet made] deciding to go into calibration mode on its own? > >If so how did you fix it? > >Menashe
4Z1NT All Messages By This Member #47315 Thank you gentlemen I now have a much better idea of how to try and fix this problem. I also have another question: What should I do with the bunch of remaining wires not used coming from the Raduino? toggle quoted message Show quoted text On 26 April 2018 at 09:36, Raj vu2zap <rajendrakumargg@...> wrote: Thanks for the patient explanation for Menashe. I was presuming that he knew about calibration. Raj At 26-04-18, you wrote: Near the bottom of this webpage: ??? under "Calibrating the Raduino" it says ???? Attach a switch between the RED wire of the the 8-pin Raduino connector and the ground. So we get the Bitx40 into calibrate mode by grounding the normally unused red wire that is two positions over from the yellow tuning pot wire. If that wire is not grounded, then a 30k resistor internal to the Nano's processor chip should pull that wire up to 5v. Raj suggests that you measure the voltage on that wire, see if it really is 5v as it should be during normal operation. If it is 5v, there is still a possibility that it is picking up a radio frequency signal that your voltmeter does not see, and that this RF signal is causing the rig to go into calibrate mode. The cap he suggests would bypass that radio frequency signal. If you do not measure 5v on that wire, I suggest you add a 1k resistor from that wire to the 5 volts from the 7805 regulator. Jerry, KE7ER On Wed, Apr 25, 2018 at 09:57 pm, 4Z1NT wrote: Which wire are we talking about? ? Menashe ? . . . ? On 25 April 2018 at 15:57, Raj vu2zap <rajendrakumargg@...> wrote: Check the voltage on the wire and if it is 5V then bypass with a 0.1 to remove noise or RF influence and see. Do all soldering with power OFF ! Raj At 25-04-18, you wrote: >Has anybody have the experience of the BITX 40 [no mods yet made] deciding to go into calibration mode on its own? > >If so how did you fix it? > >Menashe

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