Date   

Re: Bitx40 very loud, high-pitched, noise? #bitx40help #bitx40 #noise

Bob Lunsford
 

Bill, I have several wall warts that are solid state. One is 12V, 1A. Others are for cell phone charging.

A well-equipped ham has a bag or box with a collection of wall warts. {;->

Bob — KK5R

On Monday, August 3, 2020, 8:14:49 AM EDT, Bill Cromwell <wrcromwell@...> wrote:


Hi Bob,

Solid state wall warts? I suppose I retired my last vacuum tube wall
wart a couple of months ago. Let me offer you some coffee :)

73,

Bill  KU8H

bark less - wag more

On 8/2/20 7:45 PM, Bob Lunsford via groups.io wrote:
> One thing to keep in mind when using wallwarts is that if it rated at
> 12V 6A that it is producing 12V AT 6A. If not pulling 6A, the voltage
> may and probably be higher if the wallwart is a simple
> transformer/rectifier/filter supply. If it is solid state, and you can
> know this because it will not weigh as much since the transformer is
> much smaller, then the output voltage is going to stay steadier with
> varying loads.
>
> In other words, if a wallwart is used, make sure it is capable of
> current near the required current of the radio.  Another way to verify
> this is to check the power supplied to the uBITX to see that is not
> going too high when not transmitting. For me, 14V with key down is too
> much! Some may get away with it I seldom tempt fate to such a degree.
>
> Simple wallwarts are best used with devices that they are designed to
> work with and that match those devices. For my V6, I use the MFJ 30A
> supply that is loafing at the power requirements of the V6 but it is
> also supplying power to my FT-890 so it may be overkill but it is not
> going to kill the V6 because the voltage is set to 13.8V.
>
> Wallwarts are also notorious for using brute force filtering/regulation.
> The filter caps can go bad with time but they may be filtering the DC
> power but not filtering or bypassing RF that my be reflected back into
> the power supply circuitry.
>
> I usually relegate wallwarts to battery chargers and rarely if ever use
> them on a radio that I do not plan to give to my worst enemy. It is
> better and cheap insurance to use a good, regulated supply on radios of
> any value lest that value is suddenly cut short. In fact, they ONLY way
> I'd use the wallwart is if it fed a solid state regulator, one that is
> state of the art complete with all possible filtering.
>
> I'd also be tempted to use clip-on chokes on the power supply lead/s at
> the radio's power connector if there is any question about RF feedback,
> at least to eliminate this as a possible source of a feedback problem.
>
> Bob — KK5R
>
> On Sunday, August 2, 2020, 1:14:57 PM EDT, SP9DEV
> <piotrekslawecki2@...> wrote:
>
>
> Hi! I've just came back to trying to get my Bitx40 to work, and when I
> turn on the radio, I hear a terribly loud noise (link to listen below).
> The radio works fine, because I can hear some operators behind that
> noise, but I cannot tune the radio loud enough to hear them properly, as
> the noise is extremely loud even on the smallest volume. I don't really
> know what's happening here. Any help?
>
> The noise: https://www.youtube.com/watch?v=1j0ywo45N7I
>
> Here's what I got so far:
>
>  *
>
>    I've tried adding 47nF, 330pF, 10uF and 100uF caps across DC input,
>    the problem still appears
>
>  *
>
>    The problem appears when using a cheap, "wall-plug" type supply from
>    a wi-fi router
>
>  *
>
>    The problem appears while using an ATX computer supply, although the
>    noise sounds different
>
>  *
>
>    The problem doesn't appear while using 1.3Ah AGM battery
>
>  *
>
>    The TRX is assempled in PVC case and I don't see any ground-loops
>    (although maybe I'm not noticing them)
>
>  *
>
>    The problem appears no matter if the antenna is connected or not
>
>  *
>
>    The problem appears on Apple earphones and normal, cheapest earphones
>
> My guess is that the low quality power supply is the culprit, although a
> fellow HAM from Poland told me, that he uses his Bitx40 with a cheap,
> chinese supply from a sat-TV device or something like that with no
> problem, so I'm looking for other causes. Does anyone know how to solve
> the problem? And preferably the cheapest way of solving it
> (broke-ass-student-friendly, as I like to put it).
>
>




Re: RD16HHF1 power curve flattening...some

Bob Lunsford
 

I remember when QRP was 100W or less and 5W or less was identified as QRPp, (the last 'P' being a subscript 'p') and slowly this seems to have been replaced with what it is today. Guess all those Kilowatt operators back then considered anyone running 100W or less as QRP. Ha

On Monday, August 3, 2020, 8:11:15 AM EDT, Bill Cromwell <wrcromwell@...> wrote:


Not so many years ago "QRP" was 100 watts or less. Some if still similar
views.

73,

Bill  KU8H

bark less - wag more

On 8/2/20 6:31 PM, 42irongazelle@... wrote:
---snip------

  I expect that QRP units in a fifty years will be 100 Watts, so
> nobody should be afraid of exceeding 10 Watts by concreted in notions
> about QRP power levels.  Where is it written that this transceiver has
> to be a QRP only radio?
> """"""""""""""""




Re: Bitx40 very loud, high-pitched, noise? #bitx40help #bitx40 #noise

Bob Lunsford
 

Thanks for clarification, Peter.

A regular 7812 only supplies 1A and this is enough for the receive function but far short for transmit. Also, make sure to put 0.1MFD disk ceramic caps, with short-as-possible leads, at the input and output of a three terminal regulator, regardless of there being electrolytic caps there already. These are for bypassing any RF to ground.

You can also use the three terminal regulator to control a higher current transistor. There are circuits out there showing how this can be done.

Also, don't forget that the transformer and diode bridge have to be more than 1Amp capable. Any power supply design is hungry for overkill. Opt on the side of safety and being better and higher rated than it normally needs to be. Usually, this is cheap insurance, in the long run.

Bob — KK5TR

On Monday, August 3, 2020, 6:11:40 AM EDT, SP9DEV <piotrekslawecki2@...> wrote:


Bob - I didn't mean feeding 20V straight to the radio, but feeding it to a linear regulator like L7812CV to obtain clean 12V.


Re: What Happened To Versions 3, 4 and 5

iz oos
 

After making some of the mandatory changes and others less orthodox mods, I have stopped using it. Why? In my opinion It works so fine I moved to recover/modify stuff others considered dead or junk (eg. 100w tube 'cb' amplifier). I wish using the bitx during an important contest, say cqwwssb hopefully this year.


Il dom 2 ago 2020 02:56 PM BruceN <k4tql@...> ha scritto:
I haven't seen any recent posts regarding Versions 3, 4 and 5 lately.  Have they all been relegated to the junk box and everyone is buying Version 6?  Surely not all the problems with these earlier versions have been fixed.  Or has interest in them gone away.

Just wondering.  I have two version 3 units that I'm gonna build one day real soon now.

BruceN / K4TQL
--
"To invent, you need a good imagination and a pile of junk"  -- Thomas Alva Edison (1847-1931)


Re: What Happened To Versions 3, 4 and 5

Don - KM4UDX
 

Doug and Don (like the SpaceX team) have ubitx-to-ubitx via WSPR!  Like Doug,  my humble V4 operates 24/7 ('cept when I need it) multiband WSPR rx and tx.

Here is our uBITX communal connection map...



Below are AC9RZ's multi-band RX reports of my TX on a 24 hour spread, using three weeks of data.  The big gaps are driven by my band hopping schedule, or the propagation gods. 



My franken-bitx is a beast at the 24/7 workload. I started to calculate how many TX/RX cycles you get at 20% TX duty cycle over a year...and we can say it is a big number.  Yes the TX/RX relay died a overworked long suffering death. And I've cernolybled a few bits here and there...but otherwise, my V4 is a monster of a RX and a wicked effective TX.

uBITX unite! 

If anyone wants to get their uBITX working on WSPR, just let me know. Happy to help.

Don
km4udx


Re: Ubitx V6 transmitting carrier.

DC3AX
 

Hi Owen,

that is completely normal! There are quite a few unshielded traces on the PCBs of the UBITX and if your R1000 doesn't pick that up, I would consider the R1000 defective. Remember, the receiver should catch things down in the few µV  that has been sent by a transmitter across the sea with only a few watts. So it should catch up on all parasitics that are emitted in the same room :)

73 de Ulrich DC3AX


Re: RD16HHF1 power curve flattening...some

Slurm
 

Thanks MaRadioModder,

I was especially interested in the RD16HFF1 mods by Nick, John, and Erhardt.  Specifically I wondered it they had been put on the scope to look for spurs.  Seems as though they are onto something and it might be good to still use Allison's driver and pre-driver mods.   The RD solution seems to have vanished in 2018 and I'm hoping for some understanding of that.   Even a solution that doesn't work is a learning experience, and I could certainly use the learning.


Re: BITX V6 CW PROBLEM REG

Bill Cromwell
 

Hi,

If you are using the factory consider going with Reed's software. I found the CW with the factory software to be completely useless due to the problem you have. Reed's software fixed that.

73.

Bill KU8H

bark less - wag more

On 8/3/20 11:02 AM, LAKSH MUTHU wrote:
HI,
GOOD DAY TO ALL.
I am using BITX V 6.1. In it , in the CW mode, the first character is not transmitted fully and hence the CW sending is not proper. I understand this issue is in the software which will be discussed in this group and solved.I like to know whether any solution has been arrived. In as much as the output  power   from UBITX V6.1 in SSB is very low and hence contacts cannot be established and at the same time due to the CW problem, CW contacts can also not be had properly. Therefore, this rig cannot be used more effectively.
   An early solution to the CW issue will be very highly appreciated.
With regards and 73
MUTHU
VU2LMN


Re: RD16HHF1 power curve flattening...some

MadRadioModder
 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of 42irongazelle@...
Sent: Sunday, August 2, 2020 5:36 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RD16HHF1 power curve flattening...some

 

Hello Dr. ,

Has this RD16HHF1 power curve flattening mod been put on a scope yet?  Is it finalized somewhere so that we can implement it?

Thanks for all your work.

Bill


Virus-free. www.avg.com

--

…_. _._


Re: 100W Automatic Antenna Tuner...

mm0bef@...
 

I have been keeping an eye on these for some time but was not sure about performance. After seeing these posts i have ordered one to put in my V5 case. Awaiting agc kit also.

Best regards

Brian_____MM0BEF


BITX V6 CW PROBLEM REG

LAKSH MUTHU
 

HI,
GOOD DAY TO ALL.
I am using BITX V 6.1. In it , in the  CW mode, the first character is not transmitted fully and hence the CW sending is not proper. I understand this issue is in the software which will be discussed in this group and solved.I like to know whether any solution has been arrived. In as much as the output  power   from UBITX V6.1 in SSB is very low and hence contacts cannot be established and at the same time due to the CW problem, CW contacts can also not be had properly. Therefore, this rig cannot be used more effectively.
   An early solution to the CW issue will be very highly appreciated.
With regards and 73
MUTHU
VU2LMN


Re: Proposed Band plan and uBitx

Bill Cromwell
 

Hi,

ARRL should be and tries to be open about it's activities.

73,

Bill KU8H

bark less - wag more

On 8/3/20 10:15 AM, Ken Hansen wrote:
I don't think that's a real indication of their confidence the FCC will agree with their proposal. I believe the ARRL announces all of their proposals, and their track record on announced proposals is far short of 100%.
Carefully avoiding discussion of the merits of the proposal, just an observation on their history of announcements turning into FCC changes.
Ken, N2VIP

On Aug 2, 2020, at 20:34, Jeffrey Benedict <raoul@...> wrote:

The announcement was what the ARRL was recommending. If they got to the point of an announcement, I would say it's pretty sure the FCC will go for it.


Re: Proposed Band plan and uBitx

Ken Hansen
 

I don't think that's a real indication of their confidence the FCC will agree with their proposal. I believe the ARRL announces all of their proposals, and their track record on announced proposals is far short of 100%.

Carefully avoiding discussion of the merits of the proposal, just an observation on their history of announcements turning into FCC changes.

Ken, N2VIP

On Aug 2, 2020, at 20:34, Jeffrey Benedict <raoul@...> wrote:

The announcement was what the ARRL was recommending. If they got to the point of an announcement, I would say it's pretty sure the FCC will go for it.


Ubitx V6 transmitting carrier.

Owen Vinall
 

I recently followed  Ashhar's excellent Video on tuning the V6. I have completed this twice.
My issue is when I transmit voice on 3.5, 7, 21 or 28 Meg's into a dummy load I can receive my transmitted voice on a Kenwood R1000 a few metres away on AM as well as Ssb. I have an antenna on the Kenwood of a scrap of copper wire only a few cms long as I was concerned I might overload the receiver. Is this an appropriate test. Originally they were in opposte ends of the house but my Ubitx was connected to an Antenna  Tuner and a long wire. I can't seem to get any feedback on air but can hear a few strong local signals and interstate  contacts so I am assuming the Ubitx receiver is functioning reasonably well. Should morse be received on AM as I forgot to try that. I'm a complete newly so any additional assistance will be gratefully appreciated.

Regards Owen Vk5fkol 


Re: RD16HHF1 power curve flattening...some

 

807 was QRP! I am an 811 fan.

At 03/08/2020, you wrote:
Not so many years ago "QRP" was 100 watts or less. Some if still similar views.

73,

Bill KU8H

bark less - wag more

On 8/2/20 6:31 PM, 42irongazelle@... wrote:
---snip------

I expect that QRP units in a fifty years will be 100 Watts, so
nobody should be afraid of exceeding 10 Watts by concreted in notions about QRP power levels. Where is it written that this transceiver has to be a QRP only radio?
""""""""""""""""


Re: What Happened To Versions 3, 4 and 5

_Dave_ AD0B
 

v3 here. Have had voice contacts to Russia Africa and Australia. My system has a pipeline into Slovenia and se europe on 20m. In winter I run it on 160 (with a hand made air core filter), where contacts are mostly within a 1200 miles. Have worked 50 states overall. Mostly I get excellent signal reports 

Have put a soldering iron to perhaps 6 or 7 units.

I pop up once in a while but tire of the same problems which recirculate
--
73
Dave
ADOB
Raduino bracket and Ham_Made_Keys


Re: 100W Automatic Antenna Tuner...

Dave Bescoby
 


Just to add, I managed to shoehorn one of these into my uBitx v5 case for portable use and it seems to work well. As mentioned, very configurable, including LED SWR indication if required. Displays run on I2C serial connection and so should be possible to integrate with main uBitx display, which would be a nice touch.

All best wishes,

Dave


Sent from ProtonMail Mobile


On Sun, Aug 2, 2020 at 20:17, Guenter DF1KU via groups.io <gfs1415@...> wrote:
The ATU 100 is an open source project and you can find all informations on GitHub.

https://github.com/Dfinitski/N7DDC-ATU-100-mini-and-extended-boards

It works fine with my uBitx after I modified cell 5 for a minimum power of 1W. Otherwise it will not always work on the higher bands.
For modifications in EEPROM cells you need Microchip PicKit3.



Re: Bitx40 very loud, high-pitched, noise? #bitx40help #bitx40 #noise

Bill Cromwell
 

Hi Bob,

Solid state wall warts? I suppose I retired my last vacuum tube wall wart a couple of months ago. Let me offer you some coffee :)

73,

Bill KU8H

bark less - wag more

On 8/2/20 7:45 PM, Bob Lunsford via groups.io wrote:
One thing to keep in mind when using wallwarts is that if it rated at 12V 6A that it is producing 12V AT 6A. If not pulling 6A, the voltage may and probably be higher if the wallwart is a simple transformer/rectifier/filter supply. If it is solid state, and you can know this because it will not weigh as much since the transformer is much smaller, then the output voltage is going to stay steadier with varying loads.
In other words, if a wallwart is used, make sure it is capable of current near the required current of the radio.  Another way to verify this is to check the power supplied to the uBITX to see that is not going too high when not transmitting. For me, 14V with key down is too much! Some may get away with it I seldom tempt fate to such a degree.
Simple wallwarts are best used with devices that they are designed to work with and that match those devices. For my V6, I use the MFJ 30A supply that is loafing at the power requirements of the V6 but it is also supplying power to my FT-890 so it may be overkill but it is not going to kill the V6 because the voltage is set to 13.8V.
Wallwarts are also notorious for using brute force filtering/regulation. The filter caps can go bad with time but they may be filtering the DC power but not filtering or bypassing RF that my be reflected back into the power supply circuitry.
I usually relegate wallwarts to battery chargers and rarely if ever use them on a radio that I do not plan to give to my worst enemy. It is better and cheap insurance to use a good, regulated supply on radios of any value lest that value is suddenly cut short. In fact, they ONLY way I'd use the wallwart is if it fed a solid state regulator, one that is state of the art complete with all possible filtering.
I'd also be tempted to use clip-on chokes on the power supply lead/s at the radio's power connector if there is any question about RF feedback, at least to eliminate this as a possible source of a feedback problem.
Bob — KK5R
On Sunday, August 2, 2020, 1:14:57 PM EDT, SP9DEV <piotrekslawecki2@...> wrote:
Hi! I've just came back to trying to get my Bitx40 to work, and when I turn on the radio, I hear a terribly loud noise (link to listen below). The radio works fine, because I can hear some operators behind that noise, but I cannot tune the radio loud enough to hear them properly, as the noise is extremely loud even on the smallest volume. I don't really know what's happening here. Any help?
The noise: https://www.youtube.com/watch?v=1j0ywo45N7I
Here's what I got so far:
*
I've tried adding 47nF, 330pF, 10uF and 100uF caps across DC input,
the problem still appears
*
The problem appears when using a cheap, "wall-plug" type supply from
a wi-fi router
*
The problem appears while using an ATX computer supply, although the
noise sounds different
*
The problem doesn't appear while using 1.3Ah AGM battery
*
The TRX is assempled in PVC case and I don't see any ground-loops
(although maybe I'm not noticing them)
*
The problem appears no matter if the antenna is connected or not
*
The problem appears on Apple earphones and normal, cheapest earphones
My guess is that the low quality power supply is the culprit, although a fellow HAM from Poland told me, that he uses his Bitx40 with a cheap, chinese supply from a sat-TV device or something like that with no problem, so I'm looking for other causes. Does anyone know how to solve the problem? And preferably the cheapest way of solving it (broke-ass-student-friendly, as I like to put it).


Re: RD16HHF1 power curve flattening...some

Bill Cromwell
 

Not so many years ago "QRP" was 100 watts or less. Some if still similar views.

73,

Bill KU8H

bark less - wag more

On 8/2/20 6:31 PM, 42irongazelle@... wrote:
---snip------

I expect that QRP units in a fifty years will be 100 Watts, so
nobody should be afraid of exceeding 10 Watts by concreted in notions about QRP power levels.  Where is it written that this transceiver has to be a QRP only radio?
""""""""""""""""


Re: BITX V6.1 TRANSMIT RECIEVE RELAY SWITCH NOT WORKING IN LSB USB

LAKSH MUTHU
 

Dear Evan,
     Thank u vy much. I will check it up and revert back.
73
Muthu
VU2LMN
+919443114779