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Author Topic: Making the Baofeng UV-5r a base station ..  (Read 24636 times)
VK3FORK
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Posts: 54




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« on: January 03, 2015, 09:32:15 PM »

Ok this was as simple as could be ..
Simply buy from Ebay one of those battery eliminators that plug into a cigarette lighter ..
I plugged mine into my car and measured 8v ...

I then cut the plug for the cigarette lighter off !
Soldered on a plug ..  And the battery eliminator now connects to my old CB power supply ..
Resulting voltage is 8v !

That's so nice !
With my Leixen VV898 suffering sudden transmitter death ( STD ) I wanted another Tx to run and not worry about batteries ..
Speaking of batteries , I picked up my UV-B5 and it was dead .. I checked the battery and 0 volts ..
So I ordered another battery eliminator , and my UV-B5 will become my base station for 2m 70cm ..
The UV-5r was simply a test to see if it would work .. 
Im going to go out and check the battery for the UV-B5 , wonder if it suffers from parasitic drain ? ( haven't heard a boom yet )





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KA4POL
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Posts: 2409




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« Reply #1 on: January 03, 2015, 10:17:17 PM »

Practical solution.
Now, if you use an external microphone you don't have to kneel down each time you want to talk.  Grin Grin
Batteries always have some discharge. Using them regularly avoids such problems.
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VK3FORK
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Posts: 54




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« Reply #2 on: January 04, 2015, 12:59:18 AM »

I checked the other radios :  There all fine ! 
Plan on using a external hand mic , have 3 of them ...   
Simply photographed where the Tx will go ..  Right next to a bed , so I can lie down and Ham it ! 
The UV-B5 was at 0v while all my other radios were 8v or higher ... 
Might be a issue ...  Especially as I charged them all up about the same time
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VK3FORK
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Posts: 54




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« Reply #3 on: January 04, 2015, 04:55:34 AM »

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KA4POL
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Posts: 2409




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« Reply #4 on: January 04, 2015, 05:48:43 AM »

Ah, now the ASUS box makes sense  Grin Grin
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K4ISR
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Posts: 222


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« Reply #5 on: January 04, 2015, 12:20:07 PM »

Should be decent for short distance local chats and to reach some local repeaters. I had my uv-5r connected to my Jpole (35 ft up) for a few weeks and could reach vhf repeaters 16 miles away, but the biggest problem is the weak signal, they could barely make out what I was saying. So with the 4W out, I wouldn't try more than 5-10 miles.
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de K4ISR
KD8UEI
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Posts: 0




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« Reply #6 on: January 04, 2015, 12:43:12 PM »

Should be decent for short distance local chats and to reach some local repeaters. I had my uv-5r connected to my Jpole (35 ft up) for a few weeks and could reach vhf repeaters 16 miles away, but the biggest problem is the weak signal, they could barely make out what I was saying. So with the 4W out, I wouldn't try more than 5-10 miles.

That's odd because I get 5-9 reports through a repeater 18 miles away using 4 watts and a slim jim hung in front of my window.
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VK3FORK
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Posts: 54




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« Reply #7 on: January 04, 2015, 04:15:18 PM »

Should be decent for short distance local chats and to reach some local repeaters. I had my uv-5r connected to my Jpole (35 ft up) for a few weeks and could reach vhf repeaters 16 miles away, but the biggest problem is the weak signal, they could barely make out what I was saying. So with the 4W out, I wouldn't try more than 5-10 miles.

Oh dear ! , Im making far more than that @ 1.5W 
My dipole is about 4meters above the ground and Im making at least 50 miles @ 1.5W if not more for some repeaters ILOS . 
SWR is nice and flat , close to 1:1 for both 2 meter and 70cm ...
And if anything , going to the old CB power supply has made the little Tx even better , Im getting repeaters I have never been able to hear before ..
Cant wait to try the UV-B5 .. It is a superior Tx to the UV-5r , and the GT-3 , I just might have to buy a GT-3TP ..
This has worked out a lot better than expected !
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VK3FORK
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Posts: 54




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« Reply #8 on: January 04, 2015, 05:14:30 PM »

I had to check on google earth :

193miles @ 1.5watts ..

Im in Melbourne , SE suburbs and Im able to open the Portland repeater .. 193 miles away @ Low power .. 
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SOFAR
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Posts: 1270




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« Reply #9 on: January 05, 2015, 07:51:41 AM »

Keep an eye on the battery eliminator temperature, a friend of mine was using one until the plastic melted, and 2 wires came loose from solder joints. The pic is only to show the internals. Edit: there are different versions, but this is the one my friend had the problem with.

« Last Edit: January 05, 2015, 08:16:15 AM by SOFAR » Logged
VK3FORK
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Posts: 54




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« Reply #10 on: January 05, 2015, 02:57:20 PM »

Yes I was worried about that , and I imagine it could be an issue ..  
Its not like there is any cooling going on , .....

 I ran the radio all day yesterday and so far so good ( Rx ) . I guess if you Tx a lot and use high power the battery eliminator is going to get hot ...
I was wondering how tricky they would be to open up ?
Be nice to drill some holes in it for convection cooling . If not expose the entire heat sink to external air .

I did order another for the UV-5r , to dissect it .. ( They are cheap enough )
I listen far more than I talk , so no issue so far ..

These Baofeng's get hot on battery and high power when Tx for long periods , so not really a long term broadcast solution ..
For Rx and a little bit of Tx ( that's me ) , it should be fine , especially as I run low power 99.9% of the time ...  

When the new battery eliminators arrive , I will open up the UV-5r one , if I can do it and not destroy it , I will open up the one for the UV-B5 ..  
And mod both up to breath a little fresh air ..  
« Last Edit: January 05, 2015, 02:59:50 PM by VK3FORK » Logged
K3UG
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Posts: 9




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« Reply #11 on: January 18, 2015, 01:07:14 PM »

I checked the other radios :  There all fine ! 
Plan on using a external hand mic , have 3 of them ...   
Simply photographed where the Tx will go ..  Right next to a bed , so I can lie down and Ham it ! 
The UV-B5 was at 0v while all my other radios were 8v or higher ... 
Might be a issue ...  Especially as I charged them all up about the same time

Next to the bed?  I'm guessing you're not married.
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VK3FORK
Member

Posts: 54




Ignore
« Reply #12 on: January 21, 2015, 01:13:49 AM »

I checked the other radios :  There all fine ! 
Plan on using a external hand mic , have 3 of them ...   
Simply photographed where the Tx will go ..  Right next to a bed , so I can lie down and Ham it ! 
The UV-B5 was at 0v while all my other radios were 8v or higher ... 
Might be a issue ...  Especially as I charged them all up about the same time

Next to the bed?  I'm guessing you're not married.

Excellent guess ! 
Next to A bed , my napping bed ...   ( Afternoon naps )
Wife ?  WTF is that ?
Don't know how some of you do it ( Not shoot yourself ) ... 
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