Hello,
I¡¯m curious what I would need to do to use a mobile mag mount for an HF whip without mounting it to a car. I¡¯m guessing I need to get a large sheet of metal to act as a ground plain. (Because of the lack of a car.)
Chris
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Re: Nominal power supply voltage
I was lucky enough to be given a complete transceiver I don¡¯t want to mess with cutting traces and modifying it until I have everything set up. I just wanted to make sure I didn¡¯t need to increase the voltage.
Chris
I use 12 volts but a higher voltage can be delivered to just the PA feed to boost the rf output.
Hello,
I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?
Thanks,
Chris KF4FTR
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Re: Nominal power supply voltage
In the v3 the audio output chip is at its limit with 12 volts,the PA can be run from say 15. or a bit more for increased rf output
toggle quoted message
Show quoted text
Sorry. I sm withdrawing my statement.? V3, the TDA2822 WILL LIKELY GET DAMAGED AT HIGHER VOLTAGE.?
LIMIT TO 12.?
After all you can reduce 13.8 to 12 by some pot on the psu.?
On Fri, 3 Apr 2020, 1:05 pm Mvs Sarma, < mvssarma@...> wrote:
You can use? q3.8. Pl dont again say + /-
All the best.?
On Fri, 3 Apr 2020, 12:56 pm Christopher Miller, < djmalak2k6@...> wrote:
Hello,
I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?
Thanks,
Chris KF4FTR
|
Re: Nominal power supply voltage
Sorry. I sm withdrawing my statement.? V3, the TDA2822 WILL LIKELY GET DAMAGED AT HIGHER VOLTAGE.? LIMIT TO 12.?
After all you can reduce 13.8 to 12 by some pot on the psu.?
On Fri, 3 Apr 2020, 1:05 pm Mvs Sarma, < mvssarma@...> wrote: You can use? q3.8. Pl dont again say + /- All the best.?
On Fri, 3 Apr 2020, 12:56 pm Christopher Miller, < djmalak2k6@...> wrote: Hello,
I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?
Thanks, Chris KF4FTR
|
Re: Nominal power supply voltage
I use 12 volts but a higher voltage can be delivered to just the PA feed to boost the rf output.
toggle quoted message
Show quoted text
Hello,
I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?
Thanks,
Chris KF4FTR
|
Re: Nominal power supply voltage
You can use? q3.8. Pl dont again say + /- All the best.?
On Fri, 3 Apr 2020, 12:56 pm Christopher Miller, < djmalak2k6@...> wrote: Hello,
I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?
Thanks, Chris KF4FTR
|
Nominal power supply voltage
Hello,
I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?
Thanks, Chris KF4FTR
|
Re: #v6 need a 12v connectiion
#v6
One amp is not enough, you need a 3 amp supply to give a little head room.
Once you get your antenna figured out, you will want a bigger power supply. The sag would be significant. As would be the electric noise.
--
73
Dave
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Re: #v6 need a 12v connectiion
#v6
Once you get your antenna figured out, you will want a bigger power supply. The sag would be significant. As would be the electric noise.
--
73
Dave
|
Re: uBitx v.4 build information
Curt,
I wasn't arguing against your advice.? I merely stated what Allison said worked well for her.? She made other modifications too, but the order is not always clear in the older posts.? In any case, since users' rigs all seem to be a bit different, a few hundred more pF to C81 maybe be perfect, or it may require more or less e.g. experimentation may be necessary.
73,
Mark
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Re: uBitx v.4 build information
Mark
perhaps she made other adjustments, as mine improved greatly with just a few hundred pF added at C81.? please see Asshar's post about C81, I think my adjustment is consistent with what he was recommending for the FEW v4's that have a dip at 40m.?
Curt
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Re: uBitx v.4 build information
Hi Vic,
Adding 0.1uF will result in basically no frequency compensation for Q90.? Looking at past posts, Allison ended up with a total of 1100pF for C81.
73,
Mark
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Re: #v6 need a 12v connectiion
#v6
I just finished constructing my full kit uBitx v6 and powered it up with a 12v- 1amp wall wart. When?I connected?to my Mag Loop antenna, I did not receive voice nor CW. However, all the icons on the display appeared to work correctly. My problem was when I pressed the PTT on the mic, I did not get a TXT?icon lit up. I am left with one of 3 possibilities -? 1 the antenna does not work (not very likely) 2 the problem lies with the mic (possible?)? 3 the txmitter has a problem (possible but I have no way to verify) How can I verify which one is the problem, and then get it fixed??
Thanks, Larry (N8MGU)
On Thu, Apr 2, 2020 at 12:05 PM _Dave_ AD0B < davesters@...> wrote: Hi Ralph a meter could tell you what you want to know about your power source.
Definitely test the fan running off your radio power supply for electric noise. The worst offender I had was a small squirrel cage fan. On most of the units I had designed a duct to direct the air into the heat sink area . Here was the offensive fan.
?
I thought the duct was cool and fit in the space. Spent a lot of effort ciphering the fan mount without trying the fan first.?
Perhaps like a lot of 3d designers I put my prototypes on thingiverse.? The best solution I have found for uBITX heat is attaching the power transistors to large heat sinks or with isolation, to the aluminum case. No noise or extra power consumption and heat is dissipated.
--
73
Dave
-- GnuPG Public Key ID: DC840312
==============================================================
==============================================================
Never cross a Dragon, for you are crunchy and taste delicious!
My Interests are:
Ham Radio (N8MGU) | Opera | Theater | Sailing | Judaica | CKCS
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Re: uBitx v.4 build information
Boa noite, grupo.
Tenho um uBITX V4, e queimaram as suas sa¨ªda IRF510, n?o tenhos IRF510 de reserva, mas tenho no estoque dois RD16HHF1, posso trocar por IRF510, quais as provid¨ºncias neste caso? ----- Good night, group.
I have an uBITX V4, and they burned their IRF510 output, I don't have an IRF510 in reserve, but I have two RD16HHF1 in stock, can I exchange for IRF510, what are the measures in this case?
--
Sauda??es fraternais, 73/51 PY2PVB
Rubens Kamimura Tel. (18) 3746-8680 ramal 116 Cel. (18) 9-9819-2225 WhatsApp ou (18) 9-9819-2255? Em ter., 31 de mar. de 2020 ¨¤s 11:49, flatpickn via Groups.Io <flatpickn= [email protected]> escreveu:
Like some other folks, I have an unbuilt v.4. I've waited to build it until the dust settled over the fix for the harmonics and spurs. I've begun putting it together and realized how hard it is to find good information specific to the v.4. Not because it isn't there but because at the time the fixes and mods were written up they weren't identified as v.4. I'm not saying anyone was lacking in any way, it was the current version and people wrote issues, mods, and fixes. They didn't know that we'd later have a v.6 that was quite different from the v.4.?
Based on a comment by Curt in an earlier post (ubitx 4 - want a fresh start, need guidance) he posted a link with some great uBitx v.4 build information.? ? ? ? ? ? ?
I just wanted to put it here with an easily searchable title for other v.4 builders
?
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Sasquatch Stomp is Tomorrow, Friday 3 April
Hello
All,
?
Just a reminder, the annual Sasquatch Stomp is
tomorrow, Friday 3 April.
?
Check out the details here:
?
?
This is a fun event that should not be missed,
especially since most of us are doing our best to follow CDC guidelines in these
times.
?
73, and we hope to work you in the
Stomp.
?
Wayne?
NB6M?
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Re: uBitx v.4 build information
I see the website where I had posted that list of mods and links is down. here it is as a document.
=Vic=
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Re: #v6 need a 12v connectiion
#v6
Hi Ralph a meter could tell you what you want to know about your power source.
Definitely test the fan running off your radio power supply for electric noise. The worst offender I had was a small squirrel cage fan. On most of the units I had designed a duct to direct the air into the heat sink area . Here was the offensive fan.
?
I thought the duct was cool and fit in the space. Spent a lot of effort ciphering the fan mount without trying the fan first.?
Perhaps like a lot of 3d designers I put my prototypes on thingiverse.? The best solution I have found for uBITX heat is attaching the power transistors to large heat sinks or with isolation, to the aluminum case. No noise or extra power consumption and heat is dissipated.
--
73
Dave
|
Re: #v6 need a 12v connectiion
#v6
Ralph, I used P1 (which is a 12 v supply) to run my cooling fan. The middle pin is V+, the pin closest to the edge of the board is ground. Not sure what the other pin is for but I didn¡¯t need it for the fan. -- ?
73
Mick VA3EPM?
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Re: Gordon Gibby digi interface with V2.2 board
thank you, I had no idea what he was asking for -- the gentleman might not have found this free text on our web page --? that's one reason why things are also available on Amazon -- some people never find the free stuff we have put up.
Jack (KZ5A),
? ?I don't think the circuit changed, only the size of the board.? There's a link to free docs here:
/g/BITX20/topic/free_gerber_files_for_sound/19351002?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,19351002
? Dr. Gibby keeps gerbers and other info on his git page:
? ?73, Andy
? ?KG5RKP
On Wed, Apr 1, 2020 at 11:49 AM, Jack Brabham - KZ5A wrote:
Does anyone know where I can find documentation on the version 2.2 board?? Everything I can find refers to the V1.1 board?? I'm trying to troubleshoot a VOX circuit problem.
.73 Jack KZ5A
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Re: Gordon Gibby digi interface with V2.2 board
Jack (KZ5A), ? ?I don't think the circuit changed, only the size of the board.? There's a link to free docs here: /g/BITX20/topic/free_gerber_files_for_sound/19351002?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,19351002? Dr. Gibby keeps gerbers and other info on his git page: ? ?73, Andy ? ?KG5RKP
On Wed, Apr 1, 2020 at 11:49 AM, Jack Brabham - KZ5A wrote:
Does anyone know where I can find documentation on the version 2.2 board?? Everything I can find refers to the V1.1 board?? I'm trying to troubleshoot a VOX circuit problem.
.73 Jack KZ5A
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_Dave_ AD0B
Vic WA4THR
Mick