[MRCA] PRC10 Power--to Jim AC2EU

[jeepp]

Yep, several FM sets have DC floating antenna leads.  Incidental grounding, via coax braid, can smoke the radio, too.  BC-1335, etc.K3HVG



Sent from my Verizon 4G LTE smartphone

-------- Original message --------
From: J Mcvey via MRCA <mrca at mailman.qth.net> 
Date: 2/1/19  13:35  (GMT-05:00) 
To: mrca at mailman.qth.net, W9RAN at oneradio.net 
Subject: Re: [MRCA] PRC10 Power--to Jim AC2EU 


        That's a very important thing to keep in mind with this kind of setup. Neither battery terminal is common with the radio ground, so the battery MUST be isolated from ground. All of the power modules i used were the non-isolated type, which is all that is available on Ebay. It seems that if want an isolated system you will indeed have to wind some transformers. Personally, that's more work than i want to put into it. To make an efficient design is no light undertaking.
Also, be careful if using grounded bench power supplies and test  equipment. you can get a continuity loop though the power grounds and - smoke.


        
        
            
                
                
                    On Friday, February 1, 2019, 12:39:53 AM EST, Robert Nickels <ranickel at comcast.net> wrote:
                
                

                

                On 1/31/2019 9:36 PM, J Mcvey via MRCA wrote:
> Make sure you bench test  the finished product with dummy loads to 
> simulate the radio loads before you use it.

Very good idea.  Another thing to bear in mind with these things is 
isolation - or lack thereof.   In our applications we want to be able to 
have a common ground connection between the input (e.g. 12v) and HV 
output because that's how our radios work.   But these buck and boost 
converters don't always tolerate that, and the only way to know for sure 
is to "buy it and try it" because the eBay sellers have zero technical 
knowledge in most cases.   I always use a low value resistor that will 
act as a fuse if necessary to verify that common connections are possible.

73, Bob W9RAN

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