Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
Search
13.8 v power supplies safe for bitx?
|
w7hd.rh
开云体育A good setting is 12.6v for the ubitx, but 13.8 will work also.?
I would recommend, though, that if your audio chip is the WX
version that you put either a 5 or 6 volt regulator feeding it.??
(see attached file).? This keeps it in the safe operating range. Ron W7HD On 03/12/2018 09:42 AM, Randy wrote:
Yes same question except I have a "voltage adjust". What is a good setting? -- Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320 Editor OVARC newsletter |
开云体育If you are worried, put a diode or 2 in series, Silicon, 5A, 100V PIV. Mike,WA6ISP On 3/12/2018 9:35 AM,
WilliamKErickson@... wrote:
Hey guys, I know this is probably obvious to most of you, but I'm just a noob and couldn't find a definitive answer after much Google searching... -- Mike Hagen, WA6ISP 10917 Bryant Street Yucaipa, Ca. 92399 (909) 918-0058 PayPal ID "MotDog@..." Mike@... |
开云体育If you are worried, put a diode or 2 in series, Silicon, 5A, 100V PIV. Mike,WA6ISP On 3/12/2018 9:35 AM,
WilliamKErickson@... wrote:
Hey guys, I know this is probably obvious to most of you, but I'm just a noob and couldn't find a definitive answer after much Google searching... -- Mike Hagen, WA6ISP 10917 Bryant Street Yucaipa, Ca. 92399 (909) 918-0058 PayPal ID "MotDog@..." Mike@... |
开云体育
? If you are worried,
put a diode or 2 in series, Silicon, 5A, 100V PIV.? You get
reverse protection too. Mike,WA6ISP On 3/12/2018 9:35 AM, WilliamKErickson@... wrote:
Hey guys, I know this is probably obvious to most of you, but I'm just a noob and couldn't find a definitive answer after much Google searching... -- Mike Hagen, WA6ISP 10917 Bryant Street Yucaipa, Ca. 92399 (909) 918-0058 PayPal ID "MotDog@..." Mike@... |
|
My 13.8v supply can only be adjusted down to 13v internally. So I added
a 10amp diode in series with the positive lead which takes the voltage down to about 12.5v. On Mon, 12 Mar 2018 09:35:38 -0700 WilliamKErickson@... wrote: Hey guys, I know this is probably obvious to most of you, but I'm |
|
I have built 3 Bitx40 and 1 ubitx.? All of them are serviced with 13.84 volts - regulated and well filtered 5 amp power-supply. I have run the bitx40 - on digital modes for many many hours and no issues. Also the Ubitx has been performing very well. Joe VE1BWV On Mon, Mar 12, 2018 at 3:37 PM, Tim Gorman <tgorman2@...> wrote: My 13.8v supply can only be adjusted down to 13v internally. So I added |
|
For those worried about Voltage supplied to BITX/uBITX kits: Please consider History.
The "12V" standard derives from automotive - 6x 2V lead-acid cells in series (or, for electronics, 8x 1.5V 'standard' zinc-carbon dry cells). Later more precise measurement found they 'rested' or maintained best at 2.2V, so 13.2 became the 'standard'. A decent high (10-hour?)-rate charge pushes that to 2.3V/cell, so 13.8V. Most electronics designed for this 'standard' will allow a little 'overhead', with e.g. electrolytic capacitors rated to 16V. They also cope well at the recommended minimum V/cell under sustained discharge for longevity of lead-acids (1.85V or 11.1V for 6 cells). The above from (dimming) memory ... 73 de ZL2DEX |
|
Bill ... 13.8VDC would be the absolute max for the main boards ( BITX40 and uBITX). I would suspect this level is stressing the raduino, relay coils etc. over time, and stuffing the gear in an enclosure would raise the internal temp very quickly as well.
FUSE your PA and BOARD appropriately! I use a 12v sealed battery portable or a switch mode wall wart repurposed for the BITX. Output is 12.1 VDC at 2.5 Amps. There is no stress on my motherboard and in the unfortunate event of a IRF510 current runaway (high swr) or failure, the most current drawn will be limited to a couple of amps. My main shack supply would supply 30 amps plus and a lot more smoke. I have run the BITX40 for over a year now making over a hundred contacts across 3 continents with no problems, often having the rig on for the whole day. Using original heatsink on the PA but I did put another sink on the 5V regulator for the raduino just in case. Went through a few wall warts before I found a "quiet" one. Stable clean DC power is paramount.? I plan on using same power for the new uBITX but will do the 5V reg mod on my TDA2822M chip just in case. I use a built in small speakers and/or external DSP audio filter/amp/spkr - no headphones. Will be mounting? the PA's to a metal backpanel with mica insulators on this build and a sink on the raduino 5V regulator? too. 73 Tom VE3THR |
|
This is all good and important information.? My solar power system will bring my batteries up to 14.6VDC for about an hour every day.? My system normally runs art 13.4 VDC.? Usually the battery conditioning occurs while I am at work.? However when I am off work I may actually be operating when this battery conditioning is taking place.? I may need to think about putting a regulator in the case to manage this.?
I think I will use a regulator similar to a boost regulator (link below) that I use in my ham station to charge my laptop.? These produce no RF noise, at least in my use they haven't, and provide a stable regulated voltage.? This model is only about $6.00.? A little more expensive model put out by droke even has a current limiting feature.? I have some of those too.? This will likely be my solution to limiting the DC power to my UBITX on my solar power system. Thanks for the great information -- 73, W9KJO Walter |
|
Don Meyerhoff
I use one myself. Works great. Piece of mind for a couple of bucks. 73 Don Meyerhoff WA2SWX On Mar 14, 2018 3:47 PM, "Walter" <W9KJO@...> wrote: This is all good and important information.? My solar power system will bring my batteries up to 14.6VDC for about an hour every day.? My system normally runs art 13.4 VDC.? Usually the battery conditioning occurs while I am at work.? However when I am off work I may actually be operating when this battery conditioning is taking place.? I may need to think about putting a regulator in the case to manage this.? |
|
Had never heard of Drok, they have lots of stuff up on Amazon.
toggle quoted message
Show quoted text
Does your Drok allow you to set the max current anywhere from 0 Amps to say 5 Amps? Sorely needed. Lots of cheap switchers out there now, but none of them seem to deal properly with current limiting. Should be able to set both the regulated voltage and the max current. If the load sucks too much current, the voltage drops until the current comes within the set limit. Any of those switchers could do this for the price of an op-amp and a pot, maybe an extra $1. Jerry, KE7ER ? On Wed, Mar 14, 2018 at 12:47 pm, Walter wrote: A little more expensive model put out by droke even has a current limiting feature. |
|
Jack Purdum
I have a solar system that tracks the sun using a NEMA 17 stepper motor and an Arduino. A small 10W panel works through a controller to supply juice to a battery: In this case, the battery is a small motorcycle battery. I have since trade it out for a small lipo pack. Jack, W8TEE From: Don Meyerhoff <wa2swxdm@...> To: [email protected] Sent: Wednesday, March 14, 2018 3:50 PM Subject: Re: [BITX20] 13.8 v power supplies safe for bitx? I use one myself. Works great. Piece of mind for a couple of bucks. 73 Don Meyerhoff WA2SWX On Mar 14, 2018 3:47 PM, "Walter" <W9KJO@...> wrote: This is all good and important information.? My solar power system will bring my batteries up to 14.6VDC for about an hour every day.? My system normally runs art 13.4 VDC.? Usually the battery conditioning occurs while I am at work.? However when I am off work I may actually be operating when this battery conditioning is taking place.? I may need to think about putting a regulator in the case to manage this.? |
|
On Wed, Mar 14, 2018 at 01:28 pm, Jerry Gaffke wrote:
Had never heard of Drok, they have lots of stuff up on Amazon. Well, I had not thought about the current limit. I installed one for the PA voltage that does not have the current limit feature.? I will change it out to the current limit model and use the voltage only for the board supply. Now I just need to figure out how to adjust the current limit.? I think a resister network to draw current while I adjust it to the desired current level.? That would be a great safety feature. Anyone have an idea about what the max safe current for the PA buss would be?? -- 73, W9KJO Walter |
|
Don Meyerhoff
Found these on Amazon. Descent price. Good to have handy in the parts box. 73 Don Meyerhoff WA2SWX On Mar 14, 2018 4:28 PM, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote: Had never heard of Drok, they have lots of stuff up on Amazon. |
|
w7hd.rh
开云体育I just went through that due to a failing hard drive.? It was starting to drop sectors, but showed the problem as lockups when accessing various subsystems, such as serial ports.? Replaced the spinning hard drive with an SSD drive, reinstalled the Linux OS and all is well again. Ron W7HD On 03/14/2018 07:21 PM, Don Meyerhoff
wrote:
-- Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320 Editor OVARC newsletter |
|
When you current limit the PA you are doing the same thing that happens
when you overdrive a linear amp and cause flat-topping, i.e. the PA is driven out of its linear range. That causes spurious products in your transmitted signal. You would be better off fusing your PA so it can't pull too much current. Then adjust your drive level so the fuse never blows. tim ab0wr On Wed, 14 Mar 2018 15:15:40 -0700 "Walter" <W9KJO@...> wrote: On Wed, Mar 14, 2018 at 01:28 pm, Jerry Gaffke wrote:Well, I had not thought about the current limit. |
to navigate to use esc to dismiss