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Post by Deleted on Aug 19, 2014 23:52:27 GMT
I got tired of all the cords and questionable power. So I decided it was time for better power. So in walks the MFJ-4225MV ham radio power supply. It provides 25 Amps of crystal clean power. 20140819_192341 by william.hemmingsen, on Flickr Now that I had this great power supply I needed a way to distribute all this power. So i decided to make a junction box as a central location for all power. While I was at it, I decided to incorperate controls for dew heaters and 5v power for USB hub. 20140819_192259 by william.hemmingsen, on Flickr I added a nice LED volt meter on the front so I could monitor system voltage. I added 3 dials for dew heater control. The dew heaters are LED PCM controls found here www.amazon.com/LEDwholesalers-LED-Strip-Lights-Controller/dp/B003L4KKF2/ref=sr_1_2?ie=UTF8&qid=1408492047&sr=8-2&keywords=led+dimmerThe right side of the box contains 5 12v 2.1mm x 5.5mm sockets 20140819_192313 by william.hemmingsen, on Flickr The left side ate 3 RCA plugs compatible with most commercial dew heater straps 20140819_192307 by william.hemmingsen, on Flickr Since i added a switched 5v power supply to power the USB hub, I just attached it directly to the side of the power box. A single 40ft power cord goes between the MFJ-4225MV and the power distro box. All this makes for less wire mess. Hope you all like it! Hemmi
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Post by Deleted on Aug 20, 2014 13:37:34 GMT
Lol more toys!?!? Looks amazing man top job! I do worry about your marriage tho mate lol!! Your missus must be rolling in handbags and shoes to compensate!!
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Post by Deleted on Aug 20, 2014 14:46:10 GMT
She has a few pairs of Jimmy Choo's I just moved 2 tons of antique furniture for her from VA to NC. My poor back, but I saved a lot of money. So I cant do any wrong right now. Heck I even decided it may be time to upgrade the car while she is in a good mood (Maybe a upgrade Camaro 2SS 1LE). LOL
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Post by Deleted on Sept 2, 2014 16:46:17 GMT
I have been having strange connectivity issues with my cameras and other USB device sometimes when slewing my scope. My Mount, cameras, usb hub all run off the same MJF Ham power supply. What I noticed during slewing operations I would get a full 1 volt drop. At first i thought this was due to resistance from a long cable run. But after shorting the issue was still there. What I figure is happening is the 1 volt drop in voltage causes the cameras to drop USB connection. I have a homemade power distribution box which I though may be the issue, so to rule out the distribution box I got a cheap 3amp 12v power brick and wired it up to the distribution box. And what do you know, now with slewing I would only get at most is a .1v fluctuation. So it appears my 100 dollar fancy HAM power supply seems to have bad voltage fluctuations under small loads (just a couple amps). So now my question. Is it something inherent in these HAM power supplies that causes this, where as a cheap power supply does not exhibit this behavior? Is my Power supply faulty? What is strange is the voltage meter on the power supply never fluctuates, but the meter on my distribution box does. Also when I turn up my dew heater, the fans on my camera slow down noticably. But with the cheap power brick they do not. Should I send this power supply back, or do I just need something different? If different any suggestions? I need about 7amps full load. this is the power supply in question www.mfjenterprises.com/Product.php?productid=MFJ-4225MV Thanks, Hemmi
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Post by davy on Sept 2, 2014 19:27:13 GMT
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Post by Deleted on Sept 2, 2014 23:56:28 GMT
Hi Folks,
Must confess, I have always powered all my video cameras from a separate gel cell source, 7 A/hr to 120A/hr capacity -never from power supplies wall warts of power packs. Battery (Gel Cell DC power is pure clean ripple free DC and the camera's only draw what they need, not what is fed to them from a power supply. Been doing this since the late 1980's with never a failure and no interference/feed back from other electrical/electronic gear , which often happens.
Never use an unregulated power supply on cameras or sensitive electronic equipment, they can be putting out 18 volts or more and a 12 Volt DC camera will not tolerate that for long.
The only time I use power supplies on cameras is when using Sony with their own $450 unit, otherwise that invalidates the camera. Also Sony brand cameras do not have diode protection in them, they expect you to use their power supplies. Learnt this the hard way.
I was also allowed to power my video cameras in operating theatres, using a GEL cell. ANY MAINS ADAPTERS HAVE TO BE OF THE MEDICALLY APPROVED TYPE (NOT FOREIGN MADE) ETC. also.
Clear skies... Shevill
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Post by davy on Sept 3, 2014 7:23:08 GMT
I usually use a sealed lead acid battery but I use the bench power suppy for the flat..my portable set up will use a battery
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